JP5828219B2 - Cogeneration system, waste heat utilization apparatus, cogeneration system control method, and heat pump hot water supply apparatus - Google Patents

Description

The present invention relates to a cogeneration system, and is particularly suitable for a home cogeneration system.
The present invention also relates to a heat pump type hot water supply apparatus, and is particularly suitable for a household heat pump type hot water supply apparatus.

  In recent years, small cogeneration systems for use in ordinary households have been developed. This cogeneration system includes a generator equipped with a gas engine and a power generation unit constituted by a fuel cell, and generates electric energy by the generator and the fuel cell. The exhaust heat generated by these gas engines and fuel cells is used as a heat source.

Here, in a general household, the time when electricity is consumed and the time when heat is consumed are not necessarily the same. For example, in summer, the demand for power is high during the daytime when using a cooler, and the heat demand is high during the evening when using a bath.
Therefore, the cogeneration system disclosed in Patent Document 1 employs a configuration in which a storage tank is provided and thermal energy is stored by storing hot water in the storage tank.
That is, power generation is performed by driving a gas engine or the like at a time when power demand is high. And water is heated up with the heat | fever which generate | occur | produces in that case, and this heated water (hot water) is stored in a storage tank. And at the time when heat demand is high, hot water is drawn from the storage tank and used for a desired application.

The cogeneration system disclosed in Patent Document 1 has an exhaust heat / consumed heat exchanger whose primary side is connected to the gas engine side as a heat source. A hot water circulation circuit including the secondary side of the exhaust heat / consumption heat exchanger and the storage tank is formed. The hot water circulation circuit including the storage tank is filled with hot water.
Then, water is taken out from the bottom side of the storage tank and is sent to the secondary side of the exhaust heat / consumption heat exchanger, and hot water after heating is introduced from the upper side of the storage tank. As a result, convection in the storage tank is reduced, hot water is accumulated on the upper side of the storage tank, and low temperature water remains on the bottom side of the storage tank. That is, temperature stratification is formed inside the storage tank.

  When consuming hot water, cold water is injected from the bottom side of the storage tank, and the hot water accumulated at the top of the storage tank is pushed out.

  Patent Document 2 discloses a technique for increasing or decreasing the amount of water flowing on the secondary side of the exhaust heat / consumed heat exchanger according to the temperature of the cooling water flowing on the heat source side (gas engine side).

  Patent Literature 3 discloses a household heat pump hot water supply apparatus.

JP 2004-263915 A JP 2007-64518 A JP 2008-134045 A

By the way, in order to form a temperature stratification in the storage tank and store hot water in the upper part of the storage tank, the temperature of the hot water introduced into the storage tank must be above a certain level.
Therefore, the inventors made a trial production of a cogeneration system 200 having a piping system as shown in FIG.
The prototype cogeneration system 200 includes a heat source unit 101 and a hot water storage unit 102.
The heat source unit 101 is equipped with a generator 106 driven by a gas engine 105. The heat source unit 101 includes an exhaust heat recovery side circulation circuit 107 that circulates a coolant through the gas engine 105 and recovers thermal energy.

The exhaust heat recovery side circulation circuit 107 includes an expansion tank 110 and a circulation pump 111. The exhaust heat recovery side circulation circuit 107 connects the circulation pump 111, the gas engine 105, a primary side flow path of the exhaust heat / consumption heat exchanger 112, which will be described later, and the expansion tank 110 in an annular shape.
There is a coolant in the exhaust heat recovery side circulation circuit 107, and the coolant is pressurized by the circulation pump 111 and enters the gas engine 105, and further passes through the primary flow path of the exhaust heat / consumed heat exchanger 112. Then, it enters the expansion tank 110 and returns to the circulation pump 111.
Further, a coolant temperature sensor 108 is provided between the discharge side of the exhaust heat / consumption heat exchanger 112 of the exhaust heat recovery side circulation circuit 107 and the suction side of the gas engine 105, and cooling introduced into the gas engine 105. The liquid temperature is monitored. A more specific position of the coolant temperature sensor 108 is between the expansion tank 110 and the circulation pump 111.

On the other hand, the hot water storage unit 102 includes a storage tank 120, a circulation pump 121, and a waste heat / consumed heat exchanger 112. The storage tank 120, the circulation pump 121, and the secondary side flow path of the exhaust heat / consumption heat exchanger 112 are connected in a ring shape to form a hot water storage circulation circuit (heat consumption side circuit) 122.
The hot water circulation circuit 122 including the storage tank 120 is filled with hot water. When the circulation pump 121 is activated, cold water is introduced into the circulation pump 121 from the bottom side of the storage tank 120, and hot water heated through the secondary side flow path of the exhaust heat / consumption heat exchanger 112 is stored in the storage tank 120. It is injected from the top.
Further, a temperature sensor 113 for heating water is provided between the discharge side of the secondary side flow path of the exhaust heat / consumption heat exchanger 112 and the upper part of the storage tank 120, and the exhaust heat / consumption heat exchanger The temperature of hot water discharged from 112 is monitored.

In particular, in the prototype cogeneration system 200, a bypass passage 125 that bypasses the storage tank 120 is formed. A mixing valve 126 is interposed between the bypass flow path 125 and the upstream side of the circulation pump 121.
That is, the mixing valve 126 has three ports, one of which is connected to the bottom side of the storage tank 120, the other one is connected to the end of the bypass passage 125, and the remaining one is upstream of the circulation pump 121. Connected to the side (suction side).

  In the prototype cogeneration system 200, the gas engine 105 of the heat source unit 101 is started and the circulation pump 111 is operated, whereby the coolant circulates in the exhaust heat recovery side circulation circuit 107. The coolant introduced into the gas engine 105 is heated by the exhaust heat of the gas engine 105 and flows through the primary side flow path of the exhaust heat / consumed heat exchanger 112.

On the other hand, on the hot water storage unit 102 side, the circulation pump 121 is activated, cold water is introduced into the circulation pump 121 from the bottom side of the storage tank 120, and flows through the secondary side flow path of the exhaust heat / consumed heat exchanger 112. Here, the primary side flow path of the exhaust heat / consumption heat exchanger 112 constitutes a part of the exhaust heat recovery side circulation circuit 107, and high temperature coolant flows from the heat source unit 101 side. The thermal energy of the circulation circuit 107 moves to the hot water storage circuit 122 of the hot water storage unit 102.
As a result, the hot water flowing through the secondary flow path of the exhaust heat / consumed heat exchanger 112 is heated and heated.
Then, a part of the heated hot water is injected from the upper part of the storage tank 120. Further, the remaining portion of the heated hot water flows through the bypass passage 125 and returns to the suction side of the circulation pump 121.

In the prototype cogeneration system 200, the heating water temperature sensor 113 is provided between the discharge side of the secondary side flow path of the exhaust heat / consumption heat exchanger 112 and the upper portion of the storage tank 120 as described above. The temperature of the hot water discharged from the exhaust heat / consumed heat exchanger 112 is monitored.
In the prototype cogeneration system 200, the temperature of the hot water discharged from the exhaust heat / consumed heat exchanger 112 is monitored, and the mixing ratio of the mixing valve 126 is adjusted so that the temperature matches the hot water storage target temperature (use target temperature). The control method to adjust is adopted. Here, the hot water storage target temperature is a temperature suitable for pouring into the storage tank 120, and is high enough to constitute a temperature stratification. For example, the hot water storage target temperature is about 80 degrees Celsius.
That is, in the prototype cogeneration system 200, a heating water temperature sensor 113 is provided between the discharge side of the secondary side flow path of the exhaust heat / consumption heat exchanger 112 and the upper portion of the storage tank 120. The temperature of the hot water discharged from the exhaust heat / consumed heat exchanger 112 is monitored.
Then, the mixing ratio of the mixing valve 126 is adjusted so that the temperature detected by the heating water temperature sensor 113 becomes a predetermined high temperature such as 80 degrees Celsius. More specifically, when the temperature detected by the heating water temperature sensor 113 is low, the amount of hot water introduced from the bypass passage 125 is increased, and the amount of hot water introduced from the lower portion of the storage tank 120 is reduced. Then, a lot of hot water is mixed with the hot water introduced into the circulation pump 121, and the temperature of the hot water introduced into the exhaust heat / consumed heat exchanger 112 rises. As a result, the temperature of the hot water discharged from the exhaust heat / consumed heat exchanger 112 rises, and the temperature of the hot water discharged from the exhaust heat / consumed heat exchanger 112 reaches the hot water storage target temperature (use target temperature).

  Conversely, when the temperature detected by the heating water temperature sensor 113 is high, the amount of hot water introduced from the bypass passage 125 is reduced and the amount of hot water introduced from the lower portion of the storage tank 120 is increased. As a result, the temperature of the hot water introduced into the circulation pump 121 is lowered, and the temperature of the hot water introduced into the exhaust heat / consumed heat exchanger 112 is lowered. As a result, the temperature of the hot water discharged from the exhaust heat / consumption heat exchanger 112 decreases, and the temperature of the hot water discharged from the exhaust heat / consumption heat exchanger 112 falls to the target hot water storage temperature (use target temperature). .

However, the prototype cogeneration system 200 has a problem that the temperature of the hot water discharged from the exhaust heat / consumed heat exchanger 112 is not stable, and the planned temperature control cannot be performed.
That is, in the prototype cogeneration system 200, in order to reduce power consumption as much as possible, a circulating pump 121 on the hot water storage unit 102 side having a small capacity was selected. Therefore, the flow rate of hot water flowing through the hot water storage circuit 122 (including the bypass flow path 125) is small, and the detection speed of the heating water temperature sensor 113 is slightly delayed.
On the other hand, the reaction of the mixing valve 126 was sensitive. For this reason, the detection speed of the heating water temperature sensor 113 and the reaction speed of the mixing valve 126 do not match, and the operation becomes unstable. That is, the reaction speed of the mixing valve 126 is too fast for the detection speed of the temperature sensor 113 for heated water, and the mixing valve 126 has caused hunting.
Therefore, a measure was taken to intentionally delay the reaction speed of the mixing valve 126, but it was difficult to follow the disturbance.
That is, the region where the detection speed of the heating water temperature sensor 113 and the reaction speed of the mixing valve 126 match is narrow, and it is practically difficult to match the two.

Therefore, as a next measure, the mixing ratio of the mixing valve 126 is adjusted so that the temperature of the coolant introduced into the gas engine 105 is constant.
That is, the coolant that cools the gas engine 105 has a large adverse effect due to the reduction of the circulation amount, and therefore a relatively large circulation amount is secured.
Therefore, the reaction rate of the coolant temperature sensor 108 on the heat source unit 101 side is fast.
Further, there is a correlation between the temperature of the coolant and the temperature of the hot water flowing through the hot water circulation circuit 122 of the hot water storage unit 102.
For example, the temperature on the discharge side of the exhaust heat / consumption heat exchanger 112 in the hot water storage circulation circuit 122 and the temperature on the discharge side of the exhaust heat / consumption heat exchanger 112 in the exhaust heat recovery side circulation circuit 107 are the same as those of one heat exchanger. Since there is a relationship between the primary side outlet temperature and the secondary side outlet temperature, there is a strong positive correlation. That is, when the temperature on the discharge side of the exhaust heat / consumption heat exchanger 112 in the exhaust heat recovery side circulation circuit 107 is high, the temperature on the discharge side of the exhaust heat / consumption heat exchanger 112 in the hot water storage circulation circuit 122 is also high. Conversely, when the temperature on the discharge side of the exhaust heat / consumption heat exchanger 112 in the exhaust heat recovery side circulation circuit 107 is low, the temperature on the discharge side of the exhaust heat / consumption heat exchanger 112 in the hot water storage circulation circuit 122 is also low.

  As described above, when the control of adjusting the mixing ratio of the mixing valve 126 so that the temperature of the coolant introduced into the gas engine 105 is constant, the detection speed of the coolant temperature sensor 108 and the mixing valve 126 are controlled. The reaction rates matched and the temperature of the hot water flowing through the hot water circulation circuit 122 was stabilized.

However, according to this measure, the temperature of the hot water introduced into the storage tank 120 cannot be accurately detected, and the temperature of the hot water introduced into the storage tank 120 is away from the hot water storage target temperature (use target temperature). There was a case.
Therefore, the present invention pays attention to the above-described problems, and provides a cogeneration system and the like that can stabilize the temperature of the heat consumption side circuit and can bring the temperature of the liquid on the consumption side closer to a predetermined target temperature for use. Objective.
There are similar problems with heat pump hot water supply devices.
Therefore, an object of the present invention is to provide a heat pump type hot water supply apparatus in which the temperature of the refrigerant liquid is stable and the temperature of the liquid on the consumption side can be brought close to a predetermined use application target temperature.

The invention described in claim 1 for solving the above-described problem includes a power generation unit that simultaneously generates electrical energy and thermal energy, and an exhaust that recovers thermal energy of the power generation unit by circulating a coolant through the power generation unit. A heat recovery side circulation circuit, a heat consumption side circuit that circulates and / or passes liquid to store and / or consume thermal energy, and a part of the exhaust heat recovery side circulation circuit and the heat consumption side circuit constitutes exhaust heat. Coolant temperature detection for detecting the temperature of the coolant flowing through the exhaust heat recovery side circulation circuit in a cogeneration system equipped with an exhaust heat / consumption heat exchanger that transfers heat energy from the recovery side circulation circuit to the heat consumption side circuit Means, a consumption side temperature detection means for detecting the temperature of the liquid flowing in the heat consumption side circuit downstream of the exhaust heat / consumption heat exchanger, and the heat consumption side circuit side of the exhaust heat / consumption heat exchanger Liquid temperature And / or a consumer fluid control means may increase or decrease the flow rate to control the consumer fluid control means based on both the detected temperature of the detected temperature and the consuming temperature detecting means of the coolant temperature detecting means The target temperature of the coolant flowing through the exhaust heat recovery side circulation circuit is the coolant target temperature, and the heat consumption side circuit has a storage tank for storing hot water and has a function of storing thermal energy, There is a hot water circulation circuit that includes both a heat exchanger and a storage tank. Hot water is supplied to the exhaust heat / consumption heat exchanger from the lower side of the storage tank, and the hot water discharged from the exhaust heat / consumption heat exchanger is Injected from the upper part of the storage tank, and has a bypass flow path that bypasses the storage tank, the consumption side liquid control means, when the temperature of the coolant flowing through the exhaust heat recovery side circulation circuit is higher than the target coolant temperature From the bypass channel Cogeneration system characterized by reducing the hot water of the amount introduced into the heat-dissipation heat exchanger operated as to increase the hot water in the amount to be introduced into the exhaust heat-dissipation heat exchanger from the bottom of the storage tank It is.

In the cogeneration system of the present invention, the consumption side liquid control means is controlled based on both the detected temperature of the coolant temperature detection means and the detected temperature of the consumption side temperature detection means.
As an example, when components are applied to the prototype cogeneration system 200, in the present invention, the detected temperature of the coolant temperature sensor (coolant temperature detection means) 108 on the heat source unit (heat source section) 101 side and the hot water storage unit (exhaust temperature). The mixing valve (consumption side liquid control means) 126 is controlled based on both the detected temperatures of the heating water temperature sensor (consumption side temperature detection means) 113 on the heat utilization apparatus) 102 side.
In the cogeneration system of the present invention, the consumption side liquid control means is controlled in consideration of the temperature detected by the coolant temperature detection means, so the liquid discharged from the exhaust heat / consumption heat exchanger of the exhaust heat recovery side circulation circuit is controlled. The temperature stabilizes.
In the cogeneration system of the present invention, since the consumption side liquid control means is controlled in consideration of the temperature detected by the consumption side temperature detection means, the temperature of the liquid discharged from the exhaust heat / consumption heat exchanger of the heat consumption side circuit Is close to the desired target temperature.

  The temperature detected by the coolant temperature detection means or the temperature detected by the consumption side temperature detection means is the main and the subordinate is arbitrary, but the detection temperature of the coolant temperature detection means is the main and the consumption side temperature. It is recommended that the detection temperature of the detection means be subordinate. That is, it is recommended that the consumption side liquid control means is operated with the detection temperature of the coolant temperature detection means as a control target and the detection temperature of the consumption side temperature detection means is used as an auxiliary.

  The invention according to claim 2 reflecting this idea is a heat consumption side circuit, wherein the target temperature of the liquid flowing on the downstream side of the exhaust heat / consumption heat exchanger is used as the use target temperature, and the consumption side liquid control means Is controlled so that the detected temperature of the coolant temperature detecting means coincides with the target temperature of the coolant, and the coolant target temperature is corrected according to the deviation between the detected temperature of the consumption side temperature detecting means and the intended use target temperature. The cogeneration system according to claim 1.

In the cogeneration system of the present invention, the consumption side liquid control means is controlled so that the detected temperature of the coolant temperature detection means matches the target temperature of the coolant, so that the exhaust heat / consumed heat exchange of the exhaust heat recovery side circulation circuit The temperature of the liquid discharged from the container is stabilized.
Further, since the coolant target temperature is corrected in accordance with the deviation between the detected temperature of the consumption side temperature detection means and the intended use target temperature, the actual consumption side temperature is also reflected in the movement of the consumption side liquid control means. Therefore, the consumption side temperature approaches the target temperature.

The consumption side liquid control means is a mixing valve, and the heat consumption side circuit has a storage tank for storing hot water and has a function of storing thermal energy, and has both a waste heat / consumption heat exchanger and a storage tank. There is a hot water storage circuit that contains hot water from the lower side of the storage tank to the exhaust heat / consumption heat exchanger, and hot water discharged from the exhaust heat / consumption heat exchanger is injected from the upper part of the storage tank. It is desirable that the mixing valve is provided at a position where hot water flowing through the bypass flow channel and hot water supplied from a lower portion of the storage tank can be mixed .

The cogeneration system according to the aspect described above has a bypass flow path that bypasses the storage tank. Here, since the hot water discharged from the exhaust heat / consumed heat exchanger flows through the bypass flow path, the hot water heated up flows.
In the present invention, the heated hot water flowing through the bypass channel and the low-temperature hot water supplied from the lower part of the storage tank are mixed by the mixing valve to obtain an appropriate temperature. Then, the mixed hot water is introduced into the exhaust heat / consumption heat exchanger and heated again, so that the hot water discharged from the exhaust heat / consumption heat exchanger becomes close to a desired temperature. That is, according to the present invention, the temperature of the hot water before being heated by the exhaust heat / consumption heat exchanger is adjusted to an appropriate temperature in advance, and the hot water discharged from the exhaust heat / consumption heat exchanger becomes a desired temperature. ing.

Also, as one aspect, a power generation unit that simultaneously generates electrical energy and thermal energy, a waste heat recovery side circulation circuit that circulates a coolant through the power generation unit and recovers thermal energy of the power generation unit, and circulates liquid and A heat consumption side circuit that stores and / or consumes heat energy by passing through, and forms a part of the exhaust heat recovery side circulation circuit and the heat consumption side circuit, and heat from the exhaust heat recovery side circulation circuit to the heat consumption side circuit In a cogeneration system equipped with an exhaust heat / consumption heat exchanger that moves energy, a coolant temperature detection means that detects the temperature of the coolant flowing through the exhaust heat recovery side circulation circuit, and an exhaust heat / consumption heat exchanger And a consumption side temperature detecting means for detecting the temperature of the liquid flowing in the downstream side and flowing through the heat consumption side circuit, the target temperature of the coolant flowing through the exhaust heat recovery side circulation circuit as the cooling liquid target temperature, and the heat consumption side circuit The target temperature of the liquid flowing downstream of the exhaust heat / consumption heat exchanger is used as the target temperature for use, and the heat consumption side circuit is controlled so that the detected temperature of the coolant temperature detection means matches the target coolant temperature. In addition, a cogeneration system is conceivable in which the coolant target temperature is corrected in accordance with the deviation between the detected temperature of the consumption side temperature detecting means and the intended use target temperature .

The cogeneration system of this aspect is also controlled so that the detected temperature of the coolant temperature detecting means matches the coolant target temperature, so that it is discharged from the exhaust heat / heat consumption heat exchanger of the exhaust heat recovery side circulation circuit. The liquid temperature stabilizes.
Further, since the coolant target temperature is corrected in accordance with the deviation between the detected temperature of the consumption side temperature detection means and the intended use target temperature, the actual consumption side temperature is also reflected in the movement of the consumption side liquid control means. Therefore, the consumption side temperature approaches the target temperature.

According to a third aspect of the present invention, there is provided a power generation unit that simultaneously generates electric energy and thermal energy, an exhaust heat recovery side circulation circuit that recovers thermal energy of the power generation unit by circulating a coolant through the power generation unit, In the exhaust heat utilization device that stores and / or consumes the thermal energy generated in the power generation unit, connected to a heat source unit that includes a coolant temperature detection means that detects the temperature of the coolant flowing through the heat recovery side circulation circuit. A heat consumption side circuit that consumes and / or stores heat energy by circulating and / or passing, and a part of the exhaust heat recovery side circulation circuit and the heat consumption side circuit, from the exhaust heat recovery side circulation circuit to the heat consumption side circuit A waste heat / consumption heat exchanger that transfers heat energy to the waste heat, a consumption side temperature detection means that detects the temperature of the liquid that is downstream of the waste heat / consumption heat exchanger and flows through the heat consumption side circuit, Heat consumption side of the heat exchanger Consumption-side liquid control means capable of increasing or decreasing the temperature and / or flow rate of the liquid flowing into the road side, and consumed based on both the detected temperature of the cooling liquid temperature detection means and the detected temperature of the consumption-side temperature detection means The side liquid control means is controlled to set the target temperature of the coolant flowing through the exhaust heat recovery side circulation circuit as the coolant target temperature, and the heat consumption side circuit has a storage tank for storing hot water and stores thermal energy. There is a hot water circulation circuit that has both functions and includes both a waste heat / consumption heat exchanger and a storage tank. Hot water is supplied to the waste heat / consumption heat exchanger from the lower side of the storage tank to exchange waste heat / consumption heat. Hot water discharged from the container is injected from the upper part of the storage tank, and has a bypass flow path that bypasses the storage tank. The consumption side liquid control means is configured such that the temperature of the coolant flowing through the exhaust heat recovery side circulation circuit is When the temperature is higher than the target temperature To reduce the hot water amount introduced into the exhaust heat-dissipation heat exchanger from the bypass flow path operated as to increase the hot water in the amount to be introduced into the exhaust heat-dissipation heat exchanger from the bottom of the storage tank This is a waste heat utilization device.

Also in the exhaust heat utilization apparatus of the present invention, since the consumption side liquid control means is controlled in consideration of the temperature detected by the coolant temperature detection means, the liquid discharged from the exhaust heat / consumption heat exchanger of the exhaust heat recovery side circulation circuit The temperature is stabilized.
In the exhaust heat utilization apparatus of the present invention, the consumption side liquid control means is controlled in consideration of the temperature detected by the consumption side temperature detection means, so that the liquid discharged from the exhaust heat / consumption heat exchanger of the heat consumption side circuit is controlled. The temperature is close to the desired target temperature.

According to a fourth aspect of the present invention, there is provided a power generation unit that simultaneously generates electric energy and thermal energy, a waste heat recovery side circulation circuit that recovers thermal energy of the power generation unit by circulating a coolant through the power generation unit, and a liquid A heat consumption side circuit for storing and / or consuming heat energy by circulating and / or passing the heat, and a part of the exhaust heat recovery side circulation circuit and the heat consumption side circuit, from the exhaust heat recovery side circulation circuit to the heat consumption side It is equipped with a waste heat / consumption heat exchanger that moves thermal energy to the circuit, and the heat consumption side circuit has a storage tank that stores hot water and has a function of storing heat energy, and waste heat / consumption heat exchange There is a hot water circulation circuit that includes both a storage tank and a storage tank. Hot water is supplied to the exhaust heat / consumption heat exchanger from the lower side of the storage tank, and hot water discharged from the exhaust heat / consumption heat exchanger is stored in the storage tank. Infused from above, storage tank A method for controlling a cogeneration system for controlling a cogeneration system having a bypass passage which bypasses a a temperature of the cooling liquid flowing through the exhaust heat recovery side circulation circuit, on the downstream side of the exhaust heat-dissipation heat exchanger Based on both the temperature of the liquid flowing through the heat consumption side circuit, the temperature and / or flow rate of the liquid flowing into the heat consumption side circuit side of the exhaust heat / consumption heat exchanger is increased or decreased to flow through the exhaust heat recovery side circulation circuit. When the coolant target temperature is the coolant target temperature and the coolant temperature flowing through the exhaust heat recovery side circulation circuit is higher than the coolant target temperature, the coolant is introduced into the waste heat / heat consumption heat exchanger from the bypass channel. that reduces the hot water amount, the control method der cogeneration system characterized by operating so as to increase the hot water in the amount to be introduced into the exhaust heat-dissipation heat exchanger from the bottom of the storage tank .

  In the control method of the cogeneration system of the present invention, both the temperature of the coolant flowing through the exhaust heat recovery side circulation circuit and the temperature of the liquid flowing downstream of the exhaust heat / consumption heat exchanger and flowing through the heat consumption side circuit are used. Since the temperature and flow rate of the liquid flowing into the heat consumption side circuit side of the exhaust heat / consumption heat exchanger are increased or decreased based on the exhaust heat / consumption heat exchanger in both the exhaust heat recovery side circulation circuit and the heat consumption side circuit The temperature of the discharged liquid is stable and close to the desired target temperature.

Further, the invention according to claim 5 completed based on the same idea is a heat pump for generating heat energy by circulating a refrigerant liquid whose phase changes by connecting a compression means, a condensation means, an expansion means and an evaporation means in an annular shape. A circuit, a heat consuming side circuit for circulating and / or passing liquid to store and / or consume heat energy, and a part of the heat pump circuit condensing means and the heat consuming side circuit, from the heat pump circuit to the heat consuming side In a heat pump type hot water supply apparatus provided with a condensation / consumption heat exchanger for transferring thermal energy to the circuit, refrigerant liquid temperature detection means for detecting the temperature of the refrigerant liquid flowing through the condensation / consumption heat exchanger of the heat pump circuit, On the downstream side of the consumption heat exchanger, on the consumption side temperature detection means for detecting the temperature of the liquid flowing in the heat consumption side circuit, on the heat consumption side circuit side of the condensation / consumption heat exchanger Consumption side liquid control means capable of increasing or decreasing the temperature and / or flow rate of the liquid to be entered, and the target temperature of the refrigerant liquid is set as the refrigerant liquid target temperature. The target temperature of the liquid flowing downstream is used as the target temperature for use, the consumption side liquid control means is controlled so that the detection temperature of the refrigerant liquid temperature detection means matches the refrigerant liquid target temperature, and the heat consumption side circuit It has a storage tank that stores heat energy, and has a hot water circulation circuit that includes both a waste heat / consumption heat exchanger and a storage tank. The waste heat / consumption heat exchanger has a storage tank Hot water is supplied from the lower side, and hot water discharged from the exhaust heat / consumption heat exchanger is injected from the upper part of the storage tank, and has a bypass flow path that bypasses the storage tank. Flow through heat recovery side circulation circuit When the temperature of the liquid medium is higher than the target coolant temperature, the amount of hot water introduced into the exhaust heat / consumption heat exchanger from the bypass channel is reduced and introduced into the condensation / consumption heat exchanger from the bottom of the storage tank. It is a heat pump type hot water supply device that operates so as to increase the amount of hot water .

In the heat pump type hot water supply apparatus of the present invention, the consumption side liquid control means is controlled so that the detected temperature of the refrigerant liquid temperature detecting means coincides with the refrigerant liquid target temperature, so that it is discharged from the condensation / consumption heat exchanger of the heat pump circuit. The liquid temperature is stable.
In addition, since the refrigerant liquid target temperature is corrected according to the deviation between the detected temperature of the consumption side temperature detection means and the intended use target temperature, the actual consumption side temperature is also reflected in the movement of the consumption side liquid control means. Therefore, the consumption side temperature approaches the target temperature.

According to the cogeneration system, the exhaust heat utilization apparatus, and the cogeneration system control method of the present invention, the temperature of the liquid in the heat consumption side circuit is stable, and the temperature of the liquid on the consumption side is close to a predetermined target temperature for use. It becomes.
In the heat pump type hot water supply apparatus of the present invention, the temperature of the refrigerant liquid is stable, and the temperature of the liquid on the consumption side is close to a predetermined target temperature for use.

It is an operation | movement principle figure of the cogeneration system of embodiment of this invention, and the prototype cogeneration system. It is an operation | movement principle figure of the cogeneration system of other embodiment of this invention. FIG. 3 is an operation principle diagram of the embodiment of FIG. 2 and shows a heating circulation circuit. FIG. 3 is an operation principle diagram of the embodiment of FIG. 2 and shows a hot water storage circulation circuit. It is an operation principle figure of embodiment of Drawing 2, and shows a bypass way. It is an operation principle figure of embodiment of Drawing 2, and shows a hot-water supply circuit. It is an operation principle figure of the embodiment of Drawing 2, and shows the flow of hot water and a cooling fluid at the time of hot water storage operation. FIG. 3 is an operation principle diagram of the embodiment of FIG. 2 and shows the flow of hot water and coolant during a hot water supply operation. FIG. 3 is an operation principle diagram of the embodiment of FIG. 2 and shows the flow of hot water and coolant when a hot water supply operation is performed during operation of the heat source unit. FIG. 3 is an operation principle diagram of the embodiment of FIG. 2 and shows the flow of hot water and coolant when a heating operation is performed during operation of the heat source unit. FIG. 3 is an operation principle diagram of the embodiment of FIG. 2 and shows the flow of hot water and coolant when a reheating operation is performed during operation of the heat source unit. It is an operation principle figure of the heat pump type hot-water supply apparatus of the embodiment of the present invention. It is an operation | movement principle figure of the heat pump type hot-water supply apparatus of other embodiment of this invention.

Embodiments of the present invention will be further described below.
The mechanical configuration of the cogeneration system 100 of the present embodiment is the same as that of the cogeneration system 200 previously prototyped, and the operation principle diagram is common.
That is, the cogeneration system 100 includes a heat source unit 101 and a hot water storage unit 102.
The heat source unit 101 is equipped with a generator 106 driven by a gas engine 105. The heat source unit 101 includes an exhaust heat recovery side circulation circuit 107 that circulates a coolant through the gas engine 105 and recovers thermal energy.

  There is a coolant in the exhaust heat recovery side circulation circuit 107, and the coolant enters the gas engine 105 from the circulation pump 111, and further passes through the primary side flow path of the exhaust heat / consumed heat exchanger 112 to expand the expansion tank. 110 enters and returns to the circulation pump 111. Further, a coolant temperature sensor 108 is provided between the discharge side of the exhaust heat / consumption heat exchanger 112 of the exhaust heat recovery side circulation circuit 107 and the introduction side of the gas engine 105, and the cooling introduced into the gas engine 105. The liquid temperature is monitored. At the same time, it can be said that the temperature of the coolant after being deprived of heat through the exhaust heat / consumed heat exchanger 112 is monitored.

  On the other hand, the hot water storage unit 102 includes a storage tank 120, a circulation pump 121, and a waste heat / consumed heat exchanger 112. The hot water circulation circuit 122 including the storage tank 120 is filled with hot water. When the circulation pump 121 is activated, cold water is introduced into the circulation pump 121 from the bottom side of the storage tank 120, and hot water heated through the secondary side flow path of the exhaust heat / consumption heat exchanger 112 is stored in the storage tank 120. It is injected from the top. A heating water temperature sensor 113 is provided between the discharge side of the secondary side flow path of the exhaust heat / consumption heat exchanger 112 and the upper portion of the storage tank 120, and the exhaust heat / consumption heat exchanger 112. The temperature of hot water discharged from the water is monitored.

  In the cogeneration system 100, a bypass channel 125 that bypasses the storage tank 120 is formed. A mixing valve (consumption side liquid control means) 126 is interposed between the bypass flow path 125 and the upstream side of the circulation pump 121.

In the cogeneration system 100 according to the present embodiment, the temperature of the cooling water discharged from the primary side of the exhaust heat / consumption heat exchanger 112 and the hot water discharged from the secondary side of the exhaust heat / consumption heat exchanger 112. The mixing valve 126 is controlled based on both the temperatures.
More specifically, the temperature detected by the coolant temperature sensor (coolant temperature detection means) 108 provided downstream of the primary side of the exhaust heat / consumption heat exchanger 112 and the exhaust heat / consumption heat exchanger 112. The mixing valve 126 is controlled based on the temperature detected by the heating water temperature sensor (consumption side temperature detecting means) 113 provided downstream of the secondary side.

  Here, the contribution of the two temperature sensors 108 and 113 to the control of the mixing valve 126 is not equal, but the cooling valve temperature sensor 108 on the heat source unit 101 side that detects the temperature of the cooling liquid is the main component of the mixing valve 126. The detected temperature of the heated water temperature sensor (consumption side temperature detecting means) 113 on the hot water storage unit 102 side is used in an auxiliary manner.

More specifically, the opening degree of the mixing valve 126 is feedback-controlled so that the temperature detected by the coolant temperature sensor 108 matches a predetermined coolant target temperature.
That is, when the detected temperature of the coolant temperature sensor 108 is higher than the coolant target temperature, the opening of the mixing valve 126 on the bypass flow path 125 side operates in the closing direction and is connected to the bottom side of the storage tank 120. It operates in the direction of opening of the opening.
As a result, the temperature of the hot water supplied to the secondary side of the exhaust heat / consumed heat exchanger 112 decreases, the temperature difference with the coolant flowing through the primary side increases, and more from the coolant on the primary side. Take away heat. As a result, the temperature of the coolant flowing on the primary side decreases and approaches the coolant target temperature.

On the contrary, when the temperature detected by the coolant temperature sensor 108 is lower than the coolant target temperature, the opening of the mixing valve 126 on the bypass flow path 125 side is opened and connected to the bottom side of the storage tank 120. The opening on the side operates in the closing direction.
As a result, the temperature of hot water supplied to the secondary side of the exhaust heat / consumed heat exchanger 112 rises, the temperature difference with the coolant flowing through the primary side decreases, and the amount of heat taken from the primary side coolant decreases. To do. As a result, the temperature of the coolant flowing on the primary side rises and approaches the coolant target temperature.

In addition, as described above, in the present embodiment, the temperature detected by the heating water temperature sensor (consumption side temperature detecting means) 113 on the hot water storage unit 102 side is taken into consideration.
That is, when the temperature detected by the heating water temperature sensor (consumption side temperature detection means) 113 on the hot water storage unit 102 side deviates from the hot water storage target temperature (use target temperature), the coolant target temperature is changed.
More specifically, when the temperature detected by the heating water temperature sensor (consumption side temperature detection means) 113 is higher than the hot water storage target temperature (use target temperature), the coolant target temperature is lowered.
As a result, the current detected temperature of the coolant temperature sensor 108 is higher than the corrected coolant target temperature, the opening of the mixing valve 126 on the bypass flow path 125 side operates in the closing direction, and the storage tank 120 The opening on the side connected to the bottom side of the door moves in the direction of opening.
As a result, the temperature of the hot water supplied to the secondary side of the exhaust heat / consumed heat exchanger 112 decreases, the temperature difference with the coolant flowing through the primary side increases, and more heat is generated from the coolant on the primary side. Take away. As a result, the temperature of the coolant flowing on the primary side decreases and approaches the coolant target temperature.
Moreover, since the temperature of the hot water supplied to the secondary side of the exhaust heat / consumed heat exchanger 112 is lowered, the temperature of the hot water discharged from the secondary side of the exhaust heat / consumed heat exchanger 112 is also lowered. The temperature of the hot water discharged from the secondary side of the exhaust heat / consumed heat exchanger 112 approaches the hot water storage target temperature.

Conversely, when the temperature detected by the heating water temperature sensor 113 is lower than the hot water storage target temperature, the coolant target temperature is raised.
As a result, the current detected temperature of the coolant temperature sensor 108 is lower than the corrected coolant target temperature, the opening of the mixing valve 126 on the bypass flow path 125 side is opened, and the storage tank 120 is operated. The opening on the side connected to the bottom side of the lens moves in the closing direction.
As a result, the temperature of hot water supplied to the secondary side of the exhaust heat / consumed heat exchanger 112 rises, the temperature difference with the coolant flowing through the primary side decreases, and the amount of heat taken from the primary side coolant decreases. To do. As a result, the temperature of the coolant flowing on the primary side rises and approaches the coolant target temperature.
Moreover, since the temperature of the hot water supplied to the secondary side of the exhaust heat / consumption heat exchanger 112 increases, the temperature of the hot water discharged from the secondary side of the exhaust heat / consumption heat exchanger 112 also increases, The temperature of the hot water discharged from the secondary side of the exhaust heat / consumed heat exchanger 112 approaches the hot water storage target temperature.

However, the temperature of the coolant supplied to the gas engine 105 has an allowable range, and the coolant target temperature is corrected beyond the allowable range even if the detected temperature of the heating water temperature sensor 113 is far from the hot water storage target temperature. To be restricted.
That is, when the temperature of the coolant supplied to the gas engine 105 is excessively high, there is a concern that the coolant will boil in the gas engine 105 and the gas engine 105 will overheat. On the other hand, even if the temperature of the coolant supplied to the gas engine 105 is low, a fatal problem does not occur. However, if the temperature is too low, the rotation of the gas engine 105 lacks smoothness and combustion efficiency decreases.

Generally, the upper limit of the temperature of the coolant supplied to the gas engine 105 is about 80 degrees Celsius. The lower limit of the temperature of the coolant supplied to the gas engine 105 is not strict, but it is recommended to set it to about 50 degrees Celsius.
That is, the coolant target temperature is in the range of the following equation.

In this embodiment, the initial value of the coolant target temperature is determined in advance. The initial value of the coolant target temperature is a temperature lower than the hot water storage target temperature.
That is, the coolant flows on the primary side of the exhaust heat / consumed heat exchanger 112 and exchanges heat with hot water flowing on the secondary side. The temperature of the coolant is high at the primary inlet of the exhaust heat / consumed heat exchanger 112, and the outlet is low. Conversely, the temperature of the hot water at the secondary inlet of the exhaust heat / consumed heat exchanger 112 is low, and the temperature of the hot water gradually increases and becomes high at the discharge port.
Therefore, when compared on the discharge side of the exhaust heat / consumed heat exchanger 112, the temperature of the hot water on the secondary side is higher than the temperature of the coolant on the primary side.
The difference between the two depends on the temperature difference between the hot water and the coolant to be introduced and the conversion efficiency of the exhaust heat / consumed heat exchanger 112, but is generally about 3 degrees Celsius to 12 degrees Celsius.
Therefore, the initial value of the coolant target temperature is a value obtained by subtracting 3 degrees Celsius to 12 degrees Celsius from the hot water storage target temperature, and is expressed by the following equation.

The correction amount of the coolant target temperature is increased or decreased according to the deviation between the temperature detected by the heating water temperature sensor 113 and the target hot water storage temperature.
However, for the purpose of stabilizing the operation, no correction is performed when the deviation between the two is below a certain amount. For example, if the deviation between the two is 1 degree Celsius or less, the deviation is not reflected. The more recommended range does not reflect the deviation if the deviation between them is 0.8 degrees Celsius or less.

  The correction is determined according to, for example, integration of deviations within a certain time. For example, the correction value is determined by the following equation.

  The following equation may be used instead of the above equation.

  Although the basic configuration of the present invention has been described above, other components are added when actually implementing the present invention. Hereinafter, embodiments of the present invention including peripheral devices will be described.

The cogeneration system 1 shown in FIG. 2 is specifically a hot water supply / reheating / heating device, and roughly forms a cogeneration system S including a heat source unit 2 and an exhaust heat utilization device 3. The heat source unit 2 and the exhaust heat utilization device 3 are both unitized.
The heat source unit 2 includes a gas engine 5 and supplies power to an external load such as an electric device outside the cogeneration system S and heats the coolant by exhaust heat generated by power generation. Can do. The exhaust heat utilization device 3 is provided with a hot water device 6 (auxiliary heat source), and mainly heats hot water supplied to a hot water tap 7, a heating device 8 such as a floor heater or a fan convector, and the like. .

  The cogeneration system 1 includes a drive control device (none of which is shown) having a control unit that controls driving of the heat source unit 2 and the exhaust heat utilization device 3. The control unit opens and closes valves based on detection signals from the sensors provided in the heat source unit 2 and the exhaust heat utilization device 3, and controls the circulation pumps 16, 47, the gas engine 5, the hot water device 6, and the like. Is.

  The heat source unit 2 includes a gas engine 5 and a generator 10 driven by the gas engine 5. The electric power generated in the heat source unit 2 is supplied to an external load such as an electric device outside the cogeneration system S. The heat source unit 2 includes an exhaust heat recovery side circulation circuit 12 for cooling the gas engine 5.

  The exhaust heat recovery side circulation circuit 12 circulates hot water through the exhaust heat / consumption heat exchanger 30 on the exhaust heat utilization device 3 side. The exhaust heat recovery-side circulation circuit 12 includes a forward-side cooling water channel 13 through which hot water flows from the gas engine 5 toward the exhaust heat / consumption heat exchanger 30, and hot water from the exhaust heat / consumption heat exchanger 30 to the gas engine 5 side. And a return side cooling water channel 15 for returning the air. The coolant flowing in the exhaust heat recovery side circulation circuit 12 is pumped by a circulation pump 16 provided in the middle of the return side cooling water passage 15. Then, the hot water flowing through the return side cooling water passage 15 is heated by the exhaust heat generated when the gas engine 5 is driven, and flows out to the outgoing side cooling water passage 13.

  The hot water heated by the exhaust heat of the gas engine 5 and flowing in the outward cooling water channel 13 flows into the exhaust heat / consumed heat exchanger 30. Then, the hot and cold water that has undergone heat exchange in the exhaust heat / consumed heat exchanger 30 and has reached a low temperature returns to the gas engine 5 through the return side cooling water passage 15.

A coolant tank (expansion tank) 22 is provided in the middle of the return side cooling water channel 15 in addition to the circulation pump 16 described above. The cooling liquid tank 22 is provided with a water supply pipe 27 for supplying hot water from the outside, and the amount of water supplied to the cooling water tank 22 is adjusted by a replenishing water valve 28 provided in the middle thereof.
Further, a coolant temperature sensor 25 is provided in the middle of the return side cooling water passage 15 and between the coolant tank 22 and the circulation pump 16 to monitor the temperature of the coolant introduced into the gas engine 5. ing. It can be said that the coolant temperature sensor 25 measures the temperature of the coolant deprived of heat by the exhaust heat / consumed heat exchanger 30.

The exhaust heat utilization device 3 combusts heat with hot water device 6 that burns fuel gas and heats hot water, and hot water heated by the exhaust heat of the gas engine 5 that flows in the exhaust heat recovery side circulation circuit 12. A consumption heat exchanger 30 and a storage tank 31 are provided. The exhaust heat utilization device 3 includes a hot water storage circuit 41 (FIG. 4) and a hot water supply circuit 33 (FIG. 6) that supplies hot water heated by heat generated in the gas engine 5 and the hot water device 6 to the outside through the hot water tap 7. In addition to this, a load circulation circuit 35 connected to a thermal load such as the heating device 8 and a bathtub circulation circuit 36 for supplying hot water to the bathtub for circulation. Further, a bypass channel 11 (FIG. 5) is provided.
In the cogeneration system 1 of the present embodiment, a heating circulation circuit 32 shown in FIG. 3 is formed.

The hot water device 6 includes a heat exchanger 6a of one system inside, and heats hot water passing through the inside by receiving heat from the burner 6b.
In this embodiment, the heat exchanger 6a of the hot water device 6 as a heat source and the exhaust heat / consumed heat exchanger 30 are connected in series. However, there is a hot water device bypass path 23 that bypasses the hot water device 6, and the three-way valve 50 switches between the hot water device 6 side and the hot water device bypass path 23 side.

As shown in FIG. 3, the heating circulation circuit 32 is a circulation circuit including an exhaust heat / consumption heat exchanger 30 and a heat exchange unit 45.
That is, the heating circulation circuit 32 has a high temperature hot water supply side flow path 38 starting from the discharge side of the exhaust heat / consumption heat exchanger 30, and includes a three-way valve 50, a hot water device bypass path 23, a heat exchange unit 45, a mixing valve. (Consumption side liquid control means) 46 and a series of circulation circuits including a circulation pump 47 and returning to the exhaust heat / consumption heat exchanger 30. A heating water temperature sensor 21 is provided at a position in front of the three-way valve 50 in the high temperature hot water flow path 38.
A heating water temperature sensor 21 provided between the exhaust heat / consumption heat exchanger 30 and the hot water device 6 (actually the three-way valve 50) is a hot water just after being discharged from the exhaust heat / consumption heat exchanger 30. It measures temperature.

Further, the high temperature hot water supply side flow path 38 is branched to the heat exchange section 45 side and the hot water supply circuit 33 side at the forward side branch point 60, and is connected to the hot water supply circuit 33 side shown in FIG. The hot water supply forward path 83 is connected to the hot water supply mixing valve 80.
Further, a storage part hot water supply pipe 87 reaching the storage tank 31 is branched from the hot water supply outward path 83. More specifically, the hot water supply forward path 83 branched from the forward branch point 60 is branched at the branch part D1 into the hot water mixing valve 80 side and the storage part hot water supply pipe 87 connected to the storage tank 31. A high-temperature hot water distribution control proportional valve 84 is provided on the upstream side (hot water device 6 side) of the branch portion D1 where the storage portion hot water supply pipe 87 is branched. That is, the high temperature hot water distribution control proportional valve 84 is provided in the hot water supply forward path 83 between the forward branch point 60 and the branch part D1.

Further, the reservoir hot water supply pipe 87 is further branched to form a bypass passage 11 that bypasses the storage tank 31 (FIG. 5). The end of the bypass channel 11 is connected to one port of the mixing valve 46.
That is, the mixing valve 46 has three ports, one of which is connected to the bottom side of the heat exchange unit 45 and the storage tank 31, the other one is connected to the end of the bypass flow path 11, and the remaining one is It is connected to the upstream side of the circulation pump 47.

  The storage tank 31 is provided with a top temperature sensor 34a, an upper temperature sensor 34b, a middle temperature sensor 34c, and a lower temperature sensor 34d in order to detect the temperature distribution in the height direction of hot water stored therein. Yes.

  The heat exchanging part 45 constitutes a part of the heating circulation circuit 32, is provided at the tip of the heat exchange branch flow path 94, and is connected to the load heat exchanger 42 provided in the middle of the load circulation circuit 35. The flow path 45 a having the load heat exchange outlet electromagnetic valve 52 and the flow path 45 b having the reheating heat exchanger 43 and the reheating heat exchange outlet electromagnetic valve 53 provided in the middle of the bathtub circulation circuit 36 are arranged in parallel. It has been arranged. Therefore, the inflow of hot water into the load heat exchanger 42 and the additional heat exchanger 43 is adjusted by the load heat exchange outlet electromagnetic valve 52 and the additional heat exchange electromagnetic valve 53.

  The load circulation circuit 35 connected to the load heat exchanger 42 is a circuit that supplies hot water to the heating device 8.

  The bathtub circulation circuit 36 connected to the memory heat exchanger 43 is a circuit connected to the bathtub side.

  More specifically, the hot water supply circuit 33 is connected to a hot water supply path 83 branched in the middle of the high temperature hot water supply side flow path 38 via a hot water supply mixing valve 80 and a water supply pipe 85 for supplying hot water from the outside. It is. The water supply pipe 85 is connected to the hot water supply mixing valve 80.

A reservoir water supply pipe 91 that supplies hot water introduced from the outside toward the storage tank 31 is connected to the middle of the water supply pipe 85. The storage unit water supply pipe 91 is connected to the bottom side of the storage tank 31.
Furthermore, a reservoir hot water supply pipe 87 that branches from the hot water supply forward path 83 and flows into and out of the storage tank 31 is connected to the upper part of the storage tank 31. Since the storage tank 31 is supplied with approximately the same amount of hot water flowing out of the storage tank 31 through the storage section hot water supply pipe 87 via the storage section water supply pipe 91, the storage tank 31 is always full. Maintained.

Then, the flow of the hot water in the cogeneration system 1 of this embodiment is demonstrated.
The cogeneration system 1 is driven and controlled in a number of operation modes, and the flow of hot water differs for each mode.
In this specification, only typical ones will be described.
The operation modes include an exhaust heat storage operation mode for storing hot water in the storage tank 31, a hot water supply operation mode for discharging hot water from the hot water tap 7, a heating mode, and a reheating mode.

  First, the flow of hot water in the exhaust heat storage operation mode will be described with reference to FIG. In the exhaust heat storage operation mode, the gas engine 5 starts to be driven in the heat source unit 2, and the circulation pump 16 is activated accordingly, and hot water starts to circulate in the exhaust heat recovery side circulation circuit 12. The hot water flowing in the exhaust heat recovery side circulation circuit 12 is heated by the exhaust heat generated when the gas engine 5 is driven.

On the other hand, in the exhaust heat utilization device 3, the circulation pump 47 starts to be driven, and hot water in the storage tank 31 flows into the circulation pump 47 from a storage portion discharge pipe 89 provided at the bottom of the storage tank 31. The hot water discharged from the circulation pump 47 is heated by exchanging heat with the hot water heated by the exhaust heat of the gas engine 5 in the exhaust heat / consumed heat exchanger 30, and then passed through the high-temperature hot water flow-through channel 38. It flows via the flowing hot water apparatus bypass 23 and enters the reservoir hot water supply pipe 87.
A part of the hot water discharged from the exhaust heat / consumption heat exchanger 30 enters the storage tank 31, and the remaining part flows via the bypass flow path 11 and enters the mixing valve 46.

In this embodiment, as in the previous embodiment, the opening of the mixing valve 46 is fed back so that the temperature detected by the coolant temperature sensor 25 on the heat source unit 2 side matches the predetermined coolant target temperature. Be controlled.
Therefore, the temperature of the hot water supplied to the exhaust heat / consumption heat exchanger 30 is adjusted, and the coolant flowing on the primary side of the exhaust heat / consumption heat exchanger 30 matches the coolant target temperature.

Further, the coolant target temperature is corrected in accordance with the deviation between the detected temperature of the heating water temperature sensor (consumption side temperature detecting means) 21 on the exhaust heat utilization device 3 side and the hot water storage target temperature (use target temperature). The function for correction is the same as in the above-described embodiment.
As a result, the temperature of the hot water discharged from the secondary side of the exhaust heat / consumed heat exchanger 30 is adjusted and approaches the hot water storage target temperature.
Then, hot water having a temperature close to the hot water storage target temperature is supplied to the storage tank 31, and a temperature stratification is formed in the storage tank 31.

  When substantially the entire hot water stored in the storage tank 31 reaches a predetermined temperature or higher, the hot water storage in the exhaust heat hot water storage mode is completed.

  The flow of hot water when hot water is supplied using the cogeneration system 1 is as shown in FIG. That is, when the hot water tap 7 is opened while the gas engine 5 is stopped, a part of the low-temperature water supplied from the outside through the water supply pipe 85 is supplied toward the hot water supply mixing valve 80. . On the other hand, a part of the low-temperature water supplied from the outside flows into the bottom of the storage tank 31 through the storage unit water supply pipe 91 branched from the water supply pipe 85. When hot water flows from the bottom of the storage tank 31, the hot water stored in the storage tank 31 is pushed upward by this hot water, and the hot hot water stored on the upper side of the storage tank 31 becomes the storage section hot water supply pipe 87. Discharged from. Hot water discharged from the reservoir hot water supply pipe 87 flows in the hot water supply forward path 83, flows to the hot water supply mixing valve 80 side, is mixed with the low-temperature water supplied through the water supply pipe 85, and reaches an appropriate temperature. And discharged from the hot-water tap 7.

On the other hand, the flow of hot water when the hot-water tap 7 is opened while the gas engine 5 is in operation is as shown in FIG. 9, and when the hot-water tap 7 is opened, the water supply pipe 85 is opened. A part of the low-temperature water supplied from the outside is directly introduced into the exhaust heat / consumed heat exchanger 30 to be heated.
Also in this case, as in the exhaust heat storage operation mode, the opening degree of the mixing valve 46 is feedback controlled so that the temperature detected by the coolant temperature sensor 25 on the heat source unit 2 side matches the predetermined coolant target temperature. Is done.
Therefore, the temperature of the hot water supplied to the exhaust heat / consumption heat exchanger 30 is adjusted, and the coolant flowing on the primary side of the exhaust heat / consumption heat exchanger 30 matches the coolant target temperature.

  Also in this case, the coolant target temperature is corrected in consideration of the detected temperature of the heating water temperature sensor (consumption side temperature detecting means) 21 on the exhaust heat utilization device 3 side. However, the target temperature on the heated water side when hot water is being supplied does not necessarily match the target hot water storage temperature. That is, when hot water is being supplied, the coolant target temperature is corrected based on the deviation between the temperature detected by the heating water temperature sensor 21 and the hot water supply target temperature.

Moreover, in the cogeneration system 1 of this embodiment, heating operation and bath reheating operation are possible.
The flow of hot water when the heating operation is executed while the gas engine 5 is driven is as shown in FIG. 10, and the flow of hot water when the bath reheating operation is executed is as shown in FIG. Street.

In any case, the coolant target temperature is corrected in consideration of the temperature detected by the heating water temperature sensor (consumption side temperature detection means) 21 on the exhaust heat utilization device 3 side. However, the target temperature on the heated water side when the reheating operation or the heating operation is being executed does not necessarily coincide with the hot water storage target temperature. That is, when the bath reheating operation is performed, the coolant target temperature is corrected based on the deviation between the temperature detected by the heating water temperature sensor 21 and the bath reheating target temperature.
The target temperature on the heating water side when the heating operation is being executed is corrected to the target coolant temperature based on the deviation between the temperature detected by the heating water temperature sensor 21 and the heating operation target temperature.

  In the embodiment described above, the mixing valve is used as the consumption side liquid control means. However, the present invention is not limited to this, and a two-port flow control valve or a variable flow rate pump can also be used. It is.

In the above-described embodiment, the coolant temperature sensors 108 and 25 are used as the coolant temperature detecting means, and these sensors are provided between the expansion tanks 110 and 22 and the circulation pumps 111 and 16, respectively. That is, in the above-described embodiment, a configuration is adopted in which the temperature of the coolant that is not heated or cooled after the heat is removed by the exhaust heat recovery side circulation circuits 107 and 12 is detected.
However, the mounting position of the coolant temperature detecting means is not limited to this position, and it may be provided in any one of the exhaust heat recovery side circulation circuits 107 and 12. For example, a coolant temperature detecting means may be provided between the discharge side of the gas engines 105 and 5 and the exhaust heat / consumed heat exchangers 112 and 30. In this case, the initial value of the coolant target temperature is higher than the hot water storage target temperature.

However, since the temperature on the upstream side of the exhaust heat / consumed heat exchangers 112, 30 is slow to react to the temperature change of the discharge side temperature of the exhaust heat / consumed heat exchangers 112, 30 of the heat consumption side circuit, It is desirable to employ a configuration that detects the temperature of the coolant after heat has been removed by the recovery-side circulation circuits 107 and 12.
For this reason, the mounting positions of the coolant temperature sensors 108 and 25 are immediately after the discharge side of the exhaust heat / consumption heat exchangers 112 and 30 of the exhaust heat recovery side circulation circuit, before and after the expansion tanks 110 and 22, and the circulation pumps 111 and 16. It is desirable that either before or after the gas engine 105 or 5.

Although the present invention has been completed with the improvement of the cogeneration system, the technical idea of the present invention can also be applied to the heat pump hot water supply apparatuses 150 and 170.
That is, the heat pump type hot water supply apparatuses 150 and 170 have many common points with the cogeneration systems 1 and 100, and often have common technical problems.
Specifically, in the heat pump hot water supply apparatuses 150 and 170, there is a heat pump circuit 160 that exhibits the same function as the exhaust heat recovery side circulation circuits 107 and 12 of the cogeneration systems 1 and 100. Also, the heat pump hot water supply apparatuses 150 and 170 often have hot water storage circulation circuits (heat consumption side circuits) 122 and 41. Furthermore, as a heat pump type hot water supply apparatus, there are condensation / consumption heat exchangers 157 and 171 that perform the same functions as the exhaust heat / consumption heat exchangers 112 and 30 of the cogeneration systems 1 and 100.

Hereinafter, a heat pump type hot water supply apparatus 150 to which the technical idea of the present invention is applied will be described with reference to FIG.
The mechanical configuration of the heat pump hot water supply apparatus 150 of this embodiment is often the same as that of the cogeneration system 100 that was previously prototyped.
That is, the heat pump hot water supply apparatus 150 includes a heat pump unit 151 in place of the heat source unit 101 of the cogeneration system 100 described above. The heat pump hot water supply apparatus 150 includes a hot water storage unit 152 as in the cogeneration system 100 described above.
The heat pump unit 151 includes a compressor 153, an expansion valve 155, and an evaporator 156. The compressor 153, the condensing / consuming heat exchanger 157 on the hot water storage unit 152 side, the expansion valve 155, and the evaporator 156 are connected in an annular shape, and circulate the phase-change refrigerant liquid to generate thermal energy.

  That is, the compressor 153, the condenser / consumer heat exchanger 157 on the hot water storage unit 152 side, the expansion valve 155, and the evaporator 156 are connected in an annular shape to form a heat pump circuit 160, and the heat pump circuit 160 has a phase-change refrigerant. The refrigerant enters the condensation / consumption heat exchanger 157 from the compressor 153, passes through the primary flow path of the condensation / consumption heat exchanger 157, enters the expansion valve 155, passes through the evaporator 156, and then enters the compressor. Return to 153. In addition, the internal refrigerant is a gas before being compressed by the compressor 153 and is adiabatically compressed by the compressor 153 to increase the temperature. Then, heat is removed from the condenser / consumption heat exchanger 157 to be liquefied, enters the evaporator 156 through the expansion valve 155, vaporizes again, and returns to the compressor 153.

  In the present embodiment, the first refrigerant liquid temperature sensor 161 is provided on the primary side of the condensation / consumption heat exchanger 157, and the temperature of the refrigerant liquid flowing on the primary side of the condensation / consumption heat exchanger 157 is monitored. Yes. Further, a second refrigerant liquid temperature sensor 162 is provided between the discharge side of the condensation / consumption heat exchanger 157 of the heat pump circuit 160 and the introduction side of the expansion valve 155, and from the primary side of the condensation / consumption heat exchanger 157. The temperature of the discharged refrigerant liquid is monitored. That is, the temperature of the refrigerant liquid after being deprived of heat through the condenser / consumption heat exchanger 157 is monitored.

  The configuration of the hot water storage unit 152 is not much different from the embodiment of FIG. 1, and the storage tank 120, the circulation pump 121, and the condensation / consumption heat exchanger 157 are built in. The configuration of the hot water storage unit 152 is not much different from that of the embodiment of FIG.

And in the heat pump type hot water supply apparatus 150 of this embodiment, the temperature of the refrigerant liquid discharged from the primary side of the condensation / consumption heat exchanger 157 and the temperature of the hot water discharged from the secondary side of the condensation / consumption heat exchanger 157 Based on both of these, the mixing valve 126 is controlled.
More specifically, the detection temperature of the second refrigerant liquid temperature sensor (refrigerant liquid temperature detection means) 162 provided downstream of the primary side of the condensation / consumption heat exchanger 157 and the condensation / consumption heat exchanger 157 The mixing valve 126 is controlled based on the temperature detected by the heating water temperature sensor (consumption side temperature detecting means) 113 provided downstream of the secondary side.

  Here, the contribution of the two temperature sensors 162 and 113 to the control of the mixing valve 126 is not equal, but the mixing valve is mainly composed of the second refrigerant liquid temperature sensor 162 on the heat pump unit 151 side that detects the temperature of the refrigerant liquid. 126 is controlled, and the temperature detected by the temperature sensor 113 for the heated water on the hot water storage unit 152 side is used as an auxiliary.

More specifically, the opening degree of the mixing valve 126 is feedback-controlled so that the temperature detected by the second refrigerant liquid temperature sensor 162 matches a predetermined refrigerant liquid target temperature.
That is, when the temperature detected by the second refrigerant liquid temperature sensor 162 is higher than the refrigerant liquid target temperature, the opening degree of the mixing valve 126 on the bypass flow path 125 side operates in the closing direction, and the bottom side of the storage tank 120 It operates in the direction that the opening on the connected side opens.
As a result, the temperature of the hot water supplied to the secondary side of the condensing / consuming heat exchanger 157 decreases, and the temperature difference from the refrigerant liquid flowing at the primary side (gas at this stage) increases, leading to the refrigerant liquid on the primary side. Take away more heat from. As a result, the temperature of the refrigerant liquid flowing on the primary side decreases and approaches the refrigerant liquid target temperature.

On the other hand, when the temperature detected by the second refrigerant liquid temperature sensor 162 is lower than the refrigerant liquid target temperature, the opening of the mixing valve 126 on the bypass flow path 125 side operates in the direction of opening, and the bottom side of the storage tank 120 The opening on the side connected to the valve operates in the closing direction.
As a result, the temperature of the hot water supplied to the secondary side of the condensing / consuming heat exchanger 157 rises, and the temperature difference from the refrigerant liquid (gas at this stage) flowing on the primary side decreases, and the primary side refrigerant liquid Reduces the amount of heat it takes. As a result, the temperature of the refrigerant liquid flowing on the primary side rises and approaches the refrigerant liquid target temperature.

Further, as described above, in the present embodiment, the detected temperature of the heating water temperature sensor (consumption side temperature detecting means) 113 on the hot water storage unit 152 side is supplementarily taken into consideration.
That is, when the temperature detected by the hot water temperature sensor (consumption side temperature detecting means) 113 on the hot water storage unit 152 side deviates from the hot water storage target temperature (use target temperature), the refrigerant liquid target temperature is changed.
More specifically, when the detected temperature of the heating water temperature sensor 113 is higher than the hot water storage target temperature (use target temperature), the refrigerant liquid target temperature is lowered.
As a result, the current detected temperature of the second refrigerant liquid temperature sensor 162 is higher than the corrected refrigerant liquid target temperature, the opening degree of the mixing valve 126 on the bypass flow path 125 side operates in the closing direction, and storage is performed. The opening of the side connected with the bottom side of the tank 120 operates in the direction of opening.
As a result, the temperature of the hot water supplied to the secondary side of the condensation / consumption heat exchanger 157 decreases, the temperature difference with the refrigerant liquid flowing on the primary side increases, and more heat is generated from the refrigerant liquid on the primary side. Take away. As a result, the temperature of the refrigerant liquid flowing on the primary side decreases and approaches the refrigerant liquid target temperature.
Moreover, since the temperature of the hot water supplied to the secondary side of the condensation / consumption heat exchanger 157 decreases, the temperature of the hot water discharged from the secondary side of the condensation / consumption heat exchanger 157 also decreases, The temperature of the hot water discharged from the secondary side of the heat exchanger 157 approaches the hot water storage target temperature.

Conversely, when the temperature detected by the heated water temperature sensor 113 is lower than the hot water storage target temperature, the refrigerant liquid target temperature is raised.
As a result, the current detected temperature of the second refrigerant liquid temperature sensor 162 is lower than the corrected refrigerant liquid target temperature, and the opening of the mixing valve 126 on the bypass flow path 125 side is opened and operated. The opening on the side connected to the bottom side of the tank 120 operates in the closing direction.
As a result, the temperature of the hot water supplied to the secondary side of the condensation / consumption heat exchanger 157 rises, the temperature difference with the refrigerant liquid flowing through the primary side decreases, and the amount of heat taken from the refrigerant liquid on the primary side decreases. . As a result, the temperature of the refrigerant liquid flowing on the primary side rises and approaches the refrigerant liquid target temperature.
Moreover, since the temperature of the hot water supplied to the secondary side of the condensation / consumption heat exchanger 157 increases, the temperature of the hot water discharged from the secondary side of the condensation / consumption heat exchanger 157 also increases, and the subsequent condensation / The temperature of the hot water discharged from the secondary side of the heat exchanger 157 approaches the hot water storage target temperature.

  In the embodiment described above, the opening degree of the mixing valve 126 is feedback-controlled so that the detected temperature of the second refrigerant liquid temperature sensor 162 matches the predetermined refrigerant liquid target temperature, but the first refrigerant liquid temperature sensor The opening degree of the mixing valve 126 may be feedback-controlled so that the detected temperature 161 matches the predetermined refrigerant liquid target temperature.

Moreover, it is good also as a structure which has a peripheral device like above-mentioned FIG.
Since each structure of the heat pump type hot water supply apparatus 170 shown in FIG. 13 is the same as that of FIG. 2 described above, the same reference numerals are assigned to the same members, and duplicate descriptions are omitted. In the heat pump type hot water supply apparatus 170 shown in FIG. 13, the member denoted by reference numeral 171 is a condensation / consumption heat exchanger.

DESCRIPTION OF SYMBOLS 1 Cogeneration system 2 Heat source part 3 Waste heat utilization apparatus 5 Gas engine 6 Hot water apparatus 8 Heating apparatus 10 Generator 11 Bypass flow path 12 Waste heat recovery side circulation circuit 16 Circulation pump 21 Temperature sensor 25 for heating water Cooling temperature sensor 30 Waste Heat / Consumption Heat Exchanger 31 Storage Tank 33 Hot Water Supply Circuit 36 Bathtub Circulation Circuit 41 Hot Water Storage Circulation Circuit (Heat Consumption Side Circuit)
45 Heat exchange section 46 Mixing valve (consumption liquid control means)
47 Circulation pump 100 Cogeneration system 101 Heat source unit (heat source part)
102 Hot water storage unit (exhaust heat utilization device)
105 Gas Engine 107 Waste Heat Recovery Side Circulation Circuit 108 Coolant Temperature Sensor 111 Circulation Pump 112 Waste Heat / Consumption Heat Exchanger 113 Heating Water Temperature Sensor 120 Storage Tank 122 Hot Water Storage Circulation Circuit (Heat Consumption Side Circuit)
125 Bypass passage 126 Mixing valve (consumption liquid control means)
150 Heat pump type hot water supply device 151 Heat pump unit 152 Hot water storage unit 153 Compressor 155 Expansion valve 156 Evaporator 157 Condensation / consumption heat exchanger 160 Heat pump circuit 161 First refrigerant liquid temperature sensor 162 Second refrigerant liquid temperature sensor 170 Heat pump hot water supply Equipment 171 Condensation / consumption heat exchanger

Claims (5)

A power generation unit that simultaneously generates electrical energy and thermal energy, a heat recovery side circulation circuit that circulates a coolant through the power generation unit to recover the heat energy of the power generation unit, and heats by circulating and / or passing the liquid Heat consumption side circuit that stores and / or consumes energy, waste heat recovery side circulation circuit, and heat consumption side circuit that constitute part of the heat consumption side circuit and exhaust heat that moves heat energy from the waste heat recovery side circulation circuit to the heat consumption side circuit -In a cogeneration system equipped with a heat exchanger, a coolant temperature detecting means for detecting the temperature of the coolant flowing through the exhaust heat recovery side circulation circuit and a heat source downstream of the exhaust heat / heat exchanger Consumption side temperature detecting means for detecting the temperature of the liquid flowing through the consumption side circuit, and consumption side liquid capable of increasing / decreasing the temperature and / or flow rate of the liquid flowing into the heat consumption side circuit side of the exhaust heat / consumption heat exchanger Control hand With the door, it controls the consumer fluid control means based on both the detected temperature of the detected temperature and the consuming temperature detecting means of the coolant temperature detecting means,
The target temperature of the coolant flowing through the exhaust heat recovery side circulation circuit is the coolant target temperature,
The heat consumption side circuit has a storage tank that stores hot water and has a function of storing thermal energy, and has a hot water storage circuit that includes both a waste heat / consumption heat exchanger and a storage tank. Hot water is supplied to the heat exchanger from the lower side of the storage tank, and hot water discharged from the exhaust heat / consumed heat exchanger is injected from the upper part of the storage tank, and has a bypass channel that bypasses the storage tank,
When the temperature of the coolant flowing through the exhaust heat recovery side circulation circuit is higher than the coolant target temperature, the consumption side liquid control means is the amount of hot water introduced into the exhaust heat / consumption heat exchanger from the bypass flow path. Cogeneration system that operates to increase the amount of hot water introduced into the exhaust heat / consumption heat exchanger from the bottom of the storage tank .   The target temperature of the liquid that flows on the downstream side of the exhaust heat / consumption heat exchanger in the heat consumption side circuit is used as the target temperature for use, and the consumption liquid control means detects the temperature of the coolant temperature detection means at the coolant target temperature. 2. The cogeneration system according to claim 1, wherein the cogeneration system is controlled so as to match, and the coolant target temperature is corrected in accordance with a deviation between the detected temperature of the consumption side temperature detecting means and the intended use target temperature. . A power generation unit that generates electrical energy and thermal energy simultaneously, a waste heat recovery side circulation circuit that circulates a coolant through the power generation unit and recovers thermal energy of the power generation unit, and a coolant that flows through the exhaust heat recovery side circulation circuit In a waste heat utilization device that is connected to a heat source unit equipped with a coolant temperature detection means for detecting the temperature of the liquid and stores and / or consumes the heat energy generated in the power generation unit, the liquid is circulated and / or passed to cause heat energy. A heat consumption side circuit that consumes and / or stores heat, a waste heat recovery side circulation circuit, and a part of the heat consumption side circuit to transfer heat energy from the waste heat recovery side circulation circuit to the heat consumption side circuit Consumption heat exchanger, consumption side temperature detection means for detecting the temperature of the liquid flowing in the heat consumption side circuit downstream of the exhaust heat / consumption heat exchanger, and the heat consumption side circuit of the exhaust heat / consumption heat exchanger Temperature of the liquid flowing into the side And / or a consumer fluid control means may increase or decrease the flow rate to control the consumer fluid control means based on both the detected temperature of the detected temperature and the consuming temperature detecting means of the coolant temperature detecting means ,
The target temperature of the coolant flowing through the exhaust heat recovery side circulation circuit is the coolant target temperature,
The heat consumption side circuit has a storage tank that stores hot water and has a function of storing thermal energy, and has a hot water storage circuit that includes both a waste heat / consumption heat exchanger and a storage tank. Hot water is supplied to the heat exchanger from the lower side of the storage tank, and hot water discharged from the exhaust heat / consumed heat exchanger is injected from the upper part of the storage tank, and has a bypass channel that bypasses the storage tank,
When the temperature of the coolant flowing through the exhaust heat recovery side circulation circuit is higher than the coolant target temperature, the consumption side liquid control means is the amount of hot water introduced into the exhaust heat / consumption heat exchanger from the bypass flow path. The waste heat utilization device is characterized in that it operates to increase the amount of hot water introduced into the waste heat / consumption heat exchanger from the lower part of the storage tank . A power generation unit that simultaneously generates electrical energy and thermal energy, a heat recovery side circulation circuit that circulates a coolant through the power generation unit to recover the heat energy of the power generation unit, and heats by circulating and / or passing the liquid Heat consumption side circuit that stores and / or consumes energy, waste heat recovery side circulation circuit, and heat consumption side circuit that constitute part of the heat consumption side circuit and exhaust heat that moves heat energy from the waste heat recovery side circulation circuit to the heat consumption side circuit・ Equipped with a heat exchanger
The heat consumption side circuit has a storage tank that stores hot water and has a function of storing thermal energy, and has a hot water storage circuit that includes both a waste heat / consumption heat exchanger and a storage tank. Hot water is supplied to the heat exchanger from the lower side of the storage tank, and hot water discharged from the exhaust heat / consumed heat exchanger is injected from the upper part of the storage tank and has a bypass passage that bypasses the storage tank. In the control method of the cogeneration system that controls the generation system,
The heat of the exhaust heat / consumption heat exchanger based on both the temperature of the coolant flowing through the exhaust heat recovery side circulation circuit and the temperature of the liquid downstream of the exhaust heat / consumption heat exchanger and flowing through the heat consumption side circuit Increase or decrease the temperature and / or flow rate of the liquid flowing into the consumption circuit side ,
The target temperature of the coolant flowing through the exhaust heat recovery side circulation circuit is the coolant target temperature,
When the temperature of the coolant flowing through the exhaust heat recovery side circulation circuit is higher than the coolant target temperature, the amount of hot water introduced into the exhaust heat / consumed heat exchanger from the bypass flow path is reduced and A control method for a cogeneration system, characterized in that it operates so as to increase the amount of hot water introduced into an exhaust heat / consumed heat exchanger . A compression means, a condensation means, an expansion means, and an evaporation means connected in an annular shape to circulate a phase change refrigerant liquid and generate heat energy; and to circulate and / or pass the liquid to store and / or store the heat energy A heat pump type comprising a heat consumption side circuit to be consumed, and a condenser / consumption heat exchanger that constitutes a part of the heat pump circuit condensing means and the heat consumption side circuit and transfers heat energy from the heat pump circuit to the heat consumption side circuit. In the water heater, a refrigerant liquid temperature detecting means for detecting the temperature of the refrigerant liquid flowing through the heat exchanger circuit condensation / consumption heat exchanger, and the temperature of the liquid flowing through the heat consumption side circuit downstream of the condensation / consumption heat exchanger Consumption that can increase or decrease the temperature and / or flow rate of the liquid flowing into the heat consumption side circuit side of the condenser / consumption heat exchanger Liquid control means, the refrigerant liquid target temperature is the refrigerant liquid target temperature, the heat consumption side circuit is the target temperature of the liquid flowing downstream of the condensation / consumption heat exchanger is the intended use target temperature, the consumption side The liquid control means is controlled so that the detection temperature of the refrigerant liquid temperature detection means matches the refrigerant liquid target temperature,
The heat consumption side circuit has a storage tank that stores hot water and has a function of storing thermal energy, and has a hot water storage circuit that includes both a waste heat / consumption heat exchanger and a storage tank. Hot water is supplied to the heat exchanger from the lower side of the storage tank, and hot water discharged from the exhaust heat / consumed heat exchanger is injected from the upper part of the storage tank, and has a bypass channel that bypasses the storage tank,
When the temperature of the refrigerant liquid flowing through the exhaust heat recovery side circulation circuit is higher than the target refrigerant liquid temperature, the consumption-side liquid control means is the amount of hot water introduced into the exhaust heat / consumed heat exchanger from the bypass flow path. The heat pump type hot water supply device that operates to increase the amount of hot water introduced into the condensation / consumption heat exchanger from the lower part of the storage tank .

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