JP2007071471A - Heating device and hot water heater - Google Patents

Abstract

A hot water supply and heating device (11) that can perform a heating operation with sufficient heating capacity even during a defrosting operation is provided.
A heating circuit 55 includes a first heating heat exchanger 52a and a second heating heat exchanger 52b. A heating circulation path 62 is provided from the intermediate portion of the hot water storage tank 21 through the second heating heat exchanger 52b, the boiling heat exchanger 46, and the first heating heat exchanger 52a in this order to return to the hot water storage tank 21. At the time of defrosting, the circuit is switched to the heating circuit 62, the heat pump unit 13 is operated in a reverse cycle, and the hot water in the hot water storage tank 21 is exchanged with the heating circuit 55 via the second heating heat exchanger 52b. Increase the temperature of the circulating water. The hot water having passed through the second heating heat exchanger 52b flows to the boiling heat exchanger 46 while maintaining a sufficient temperature for defrosting, exchanges heat with the refrigerant circuit 44, and the evaporator 48 of the heat pump unit 13 Defrost. The hot water that has passed through the boiling heat exchanger 46 exchanges heat with the heating circuit 55 via the first heating heat exchanger 52a, and raises the temperature of the circulating water in the heating circuit 55.
[Selection] Figure 1

Description

  The present invention relates to a heat pump unit heating apparatus and a hot water supply / heating apparatus that use hot water boiled by a heat pump unit in a hot water storage tank for heating.

  2. Description of the Related Art Conventionally, there is a hot water supply and heating device that stores hot water boiled by a heat pump unit in a hot water storage tank and uses the hot water stored in the hot water storage tank for hot water supply or heating.

  This hot water heater has a boiling circulation path from the lower part of the hot water storage tank to the upper part of the hot water storage tank through the circulation pump and the heat exchanger for boiling of the heat pump unit. The water is boiled through the unit's boiling heat exchanger, and the boiled hot water is taken into the upper part of the hot water storage tank, so that hot water is stored from the upper part of the hot water storage tank using the difference in specific gravity between the hot water and water. .

  Furthermore, when the hot water stored in the hot water storage tank is used for heating, it passes from the upper part of the hot water storage tank to the lower part of the hot water storage tank through the circulation pump, the heat exchanger for boiling of the heat pump unit, and the heat exchanger for heating of the heating circuit. Switch back to the heating circuit, remove the hot water from the upper part of the hot water storage tank, exchange heat with the circulating water in the heating circuit through the heating heat exchanger of the heating circuit, and exchange the heat to the hot water storage tank. Return to the bottom.

  The boiling circulation path and the heating circulation path share a circulation path area in which a circulation pump is arranged, and are switched using a switching valve. There is no need for a circulation pump, reducing product costs.

  In addition, when heating while operating the heat pump unit at the time of stable heating after the elapse of a predetermined time from the start of the heating operation, the heating tank is passed through the boiling heat exchanger and the heating heat exchanger in order from the lower part of the hot water storage tank. Switch to the heating heating circuit that returns to the lower part, take out the water in the lower part of the hot water storage tank, boil it through the heat exchanger for heating in the heat pump unit, and pass this heated water through the heat exchanger for heating in the heating circuit Heat is exchanged with circulating water in the heating circuit, and the hot water whose temperature has decreased due to this heat exchange is returned to the lower part of the hot water storage tank.

  In addition, during operation of the heat pump unit, the temperature of the evaporator is lowered to collect atmospheric heat, so as the operating time elapses, water vapor in the atmosphere adheres to the evaporator and freezes, resulting in atmospheric heat. The heat collection efficiency will decrease. Therefore, by operating the heat pump unit in a cycle opposite to the cycle at the time of boiling, a defrosting operation for heating the evaporator and melting the attached frost is performed.

During this defrosting operation, the hot water stored in the hot water storage tank is used for heating, from the upper part of the hot water storage tank, the circulation pump, the heat exchanger for boiling of the heat pump unit, the heat exchanger for heating of the heating circuit After switching to the heating circuit that goes back to the lower part of the hot water storage tank, the hot water in the upper part of the hot water storage tank is taken out and sent to the heat exchanger for boiling of the heat pump unit. Heat is exchanged with the refrigerant so that it can be quickly defrosted (see, for example, Patent Document 1).
Japanese Unexamined Patent Publication No. 2004-183908 (page 5-7, FIG. 2-6)

  However, at the time of defrosting operation, the hot water in the upper part of the hot water storage tank is taken out, but the temperature is lowered by passing through the heat exchanger for boiling of the heat pump unit, and this hot water having the lowered temperature is used for heating the heating circuit. Since it flows into the heat exchanger, it is necessary to stop the heating circuit.

  However, during the defrosting operation, the hot water in the upper part of the hot water storage tank flows in sequence to the heat exchanger for boiling of the heat pump unit and the heat exchanger for heating of the heating circuit, but the heat exchanger for boiling of the heat pump unit is Since the circulating water flowing through the heating circuit is lowered to a temperature at which it is difficult to sufficiently raise the temperature, the heating capacity is reduced even if the heating circuit is stopped or not stopped. .

  This invention is made | formed in view of such a point, and it aims at providing the heating apparatus and hot-water supply heating apparatus which can be heated by sufficient heating capability also at the time of a defrost operation.

  The heating device according to claim 1 has a hot water storage tank, a refrigerant circuit provided with a compressor, a heat exchanger for boiling and an evaporator, and at the time of boiling, the compressor, the heat exchanger for boiling and the evaporator Heat pump unit that operates in a boiling cycle in which refrigerant flows in the order of, and in reverse cycle with respect to the boiling cycle during defrosting, a heating circuit having a heating heat exchanger, and heat exchange for boiling from the hot water storage tank A boiling circulation path that returns to the hot water storage tank through the heater, a heating circulation path that passes through the heating heat exchanger from the hot water storage tank and then returns to the hot water storage tank via the heating heat exchanger, and the boiling circulation path A circulation path switching means for switching between the heating circuit and the heating circulation path, and at the time of boiling, the circulation path switching means switches to the heating circulation path and operates the heat pump unit in a boiling cycle, and at the time of heating, the circulation path switching means heating Switched to the circulation path, the time of defrosting in which and a control unit for operating the heat pump unit with the switching to the heating circulation path in the circulation path switching means in the reverse cycle.

  The heating device according to claim 2 has a hot water storage tank, a refrigerant circuit provided with a compressor, a heat exchanger for boiling and an evaporator, and at the time of boiling, the compressor, the heat exchanger for boiling and the evaporator A heat pump unit that operates in a boiling cycle in which the refrigerant flows in this order and operates in a reverse cycle with respect to the boiling cycle during defrosting, a first heating heat exchanger and a second heating heat connected in series A heating circuit having an exchanger, a boiling circulation path from the hot water storage tank to the hot water storage tank via the boiling heat exchanger, and a heating heat after passing from the hot water storage tank to the second heating heat exchanger A heating circulation path that returns to the hot water storage tank through the exchanger and the first heating heat exchanger in order, a circulation path switching means that switches between the boiling circulation path and the boiling heating circulation path, When switching to the boiling circuit with the circuit switching means The heat pump unit is operated in a boiling cycle, and when heating is performed, the circuit is switched to the heating circuit by the circuit switching unit, and when the defrosting is performed, the circuit is switched to the heating circuit by the circuit switching unit and the heat pump unit is operated in the reverse cycle. And a control unit to be operated.

  The heating device according to claim 3 is the heating device according to claim 2, wherein the heating heating circulation path returns from the hot water storage tank to the hot water storage tank through the heating heat exchanger and the first heating heat exchanger in order. The controller is configured to switch to the boiling heating circulation path by the circulation path switching means during boiling heating and to operate the heat pump unit in the boiling cycle.

  The heating device according to claim 4 is the heating device according to claim 2 or 3, wherein the first and second heating heat exchangers are arranged in the order of the circulation direction of the heating circuit and the circulation direction of the heating circulation path. The order is connected in reverse.

  A hot water supply and heating apparatus according to a fifth aspect includes the heating apparatus according to any one of the first to fourth aspects and a hot water supply passage for supplying hot water in a hot water storage tank.

  According to the heating device of claim 1, at the time of defrosting, the hot water taken out from the intermediate portion or more of the hot water storage tank is first heated by switching to the heating circulation path and operating the heat pump unit in the reverse cycle. Heat can be exchanged with the heating circuit through the heating circuit, and the temperature of the circulating water in the heating circuit can be raised sufficiently. Furthermore, the hot water that has passed through the heating heat exchanger is kept at a sufficient temperature for defrosting. It flows into the heat exchanger for boiling and exchanges heat with the refrigerant circuit, so that the evaporator of the heat pump unit can be defrosted. Therefore, it can be defrosted in a short time and heating operation with sufficient heating capacity even during this defrosting operation Can do.

  According to the heating device of claim 2, at the time of defrosting, the hot water taken out from the intermediate portion or more of the hot water storage tank is first switched to the heating circulation path and the heat pump unit is operated in the reverse cycle. Heat can be exchanged with the heating circuit via the heat exchanger, and the temperature of the circulating water in the heating circuit can be raised sufficiently. Furthermore, the hot water passed through the second heating heat exchanger has a sufficient temperature for defrosting. It flows into the heat exchanger for boiling of the heat pump unit while maintaining the heat exchange with the refrigerant circuit, the evaporator of the heat pump unit can be defrosted, and the hot water that has passed through the heat exchanger for boiling of the heat pump unit is the first Heat can be exchanged with the heating circuit via the heating heat exchanger, and the circulating water in the heating circuit can absorb heat even a little, so it can be defrosted in a short time and is sufficient for this defrosting operation. It is heating operation in bunches ability.

  According to the heating device according to claim 3, in addition to the effect of the heating device according to claim 2, the hot water storage tank of the hot water storage tank is sequentially passed from the lower part of the hot water storage tank through the boiling heat exchanger and the first heating heat exchanger. The heating operation can be continued with sufficient capacity even when switching to the defrosting operation at the time of boiling heating where the heat pump unit is operated in the boiling cycle while switching to the heating heating circulation path returning to the lower part.

  According to the heating device according to claim 4, in addition to the effect of the heating device according to claim 2 or 3, the order of the circulation direction of the heating circuit and heating for the first and second heating heat exchangers Since the circulation direction of the circulation path is connected in reverse order, the circulating water in the heating circuit can be heat-exchanged step by step in the order of low-temperature hot water to high-temperature hot water in the heating circuit. The heat exchange efficiency as a whole can be improved and the temperature of the circulating water in the heating circuit can be increased.

  According to the hot water supply and heating device of the fifth aspect, the hot water supply passage for supplying hot water from the hot water storage tank of the heating device according to any one of the first to fourth aspects is provided, and hot water supply and heating can be performed.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the hot water supply and heating device 11 includes a main unit 12, a heat pump unit 13, and a heating unit 14, and further includes an automatic hot water filling function for automatically filling the bathtub 15 and hot water filled in the bathtub 15. It has a chasing function for chasing.

  The main unit 12 has a hot water storage tank 21 for storing hot water. The hot water storage tank 21 is provided with an upper connection port 22, two intermediate connection ports 23, and lower connection ports 24a and 24b at the upper, middle and lower portions, respectively. It has been. On the side surface of the hot water storage tank 21, a plurality of temperature detections for detecting the hot water temperature in the hot water storage tank 21 at the respective height positions of, for example, 60 L, 120 L, 180 L from the top of the hot water storage tank 21 and 30 L, 60 L from the bottom. Thermistors 25a to 25e as means are provided.

  An upper pipe 27 is connected to the upper connection port 22 of the hot water storage tank 21, an intermediate pipe 28 is connected to the intermediate connection port 23, and lower pipes 29a and 29b are connected to the lower connection ports 24a and 24b.

  A water supply pipe 30 that is connected to a water supply source such as a water pipe is connected to a midway position of the lower pipe 29a via a pressure reducing valve 31.

  Between the hot water storage tank 21 and the heat pump unit 13, a circulation pipe 33 that circulates the hot water in the hot water storage tank 21 with the heat pump unit 13 is installed. The circulation pipe 33 has a forward pipe 34 through which hot water in the hot water storage tank 21 flows into the heat pump unit 13 and a return pipe 35 through which hot water discharged from the heat pump unit 13 returns to the hot water storage tank 21. A circulation pump 36 for circulating hot water from the forward pipe 34 to the return pipe 35 is disposed.

  A first three-way valve 39 for switching the flow path between the upper pipe 27, the intermediate pipe 28, and the connection pipe 38 that can be connected to the return pipe 35 and the return pipe 35 of the circulation pipe 33, respectively. Is arranged.

  Between the connection pipe 38, one lower pipe 29a, and the forward pipe 34 of the circulation pipe 33, a second three-way valve 40 for switching the flow path between them is disposed.

  Between the connection pipe 38, the other lower pipe 29b, and the return pipe 35 of the circulation pipe 33, an adjustment valve 41 for switching the flow path between them is disposed. This adjustment valve 41 is a hot water storage position where only the connection pipe 38 side is opened with respect to the return pipe 35 of the circulation pipe 33, a heating only position where only the other lower pipe 29b is opened, the connection pipe 38 side and the other lower pipe 29b. And can be switched to a hot water storage / heating adjustment position that adjusts the ratio of the flow rate to them. In this hot water storage / heating adjustment position, the ratio of each flow rate between the upper part and the intermediate part is, for example, 10%: 90%, 20%: 80%, ... 90%: 10% when the total flow rate is 100%. For example, it may be variable in a plurality of stages, or may be continuously variable.

  The heat pump unit 13 includes a refrigerant circuit 44 filled with a refrigerant. The refrigerant circuit 44 includes a compressor 45, a heat exchanger 46 for boiling that functions as a condenser, an expansion valve 47, an evaporator 48, A four-way valve 49 for switching the cycle between a boiling cycle (forward cycle) and a reverse cycle with respect to the boiling cycle is included. In the boiling cycle, the refrigerant circulates in the order of the compressor 45, the boiling heat exchanger 46, the expansion valve 47, the evaporator 48, and the compressor 45, and collects heat from the outside air in the evaporator 48 to heat the boiling heat exchanger. At 46, water circulating through the circulation pipe 33 is boiled. The reverse cycle is switched at the time of defrosting. In this reverse cycle, the refrigerant circulates in the order of the compressor 45, the evaporator 48, the expansion valve 47, the boiling heat exchanger 46, and the compressor 45, and heat exchange for boiling. The evaporator 46 absorbs heat from the hot water circulating through the circulation pipe 33 and raises the temperature of the evaporator 48 for defrosting. The compressor 45, the expansion valve 47, the evaporator 48, etc. are arranged in an outdoor unit 50 different from the main unit 12, and the boiling heat exchanger 46 etc. are either in the main unit 12 or on the outdoor unit 50 side. It may be arranged.

  Further, the heating unit 14 is for floor heating or indoor heating, for example, and includes a first heating heat exchanger 52a and a second heating heat exchanger 52b connected in series as a heating heat exchanger, A heating circuit 55 including a heating panel 53, a circulation pump for heating 54, and the like is provided. The heating circuit 55 is filled with circulating water for heat exchange, and the circulating water is heated by the heating circulation pump 54 to the first heating heat exchanger 52a, the second heating heat exchanger 52b, the heating panel 53, and for heating. It circulates in order of the circulation pump 54. These heating heat exchangers 52a and 52b, the heating circulation pump 54, and the like are arranged in the main unit 12.

  The first heating heat exchanger 52a is connected to a middle position of the other lower pipe 29b between the other lower connection port 24b of the hot water storage tank 21 and the regulating valve 41. The second heating heat exchanger 52b is connected to an intermediate position of the connection pipe 38 between the first three-way valve 39 and the second three-way valve 40.

  One lower pipe 29a, the second three-way valve 40, the outgoing pipe 34 of the circulation pipe 33, the circulation pump 36, the heat exchanger 46 for heating of the heat pump unit 13, the return pipe 35 of the circulation pipe 33, the adjustment valve 41 The connection pipe 38, the first three-way valve 39, and the upper pipe 27 constitute a boiling circulation path 61 that returns from the lower part of the hot water storage tank 21 to the upper part of the hot water storage tank 21 through the boiling heat exchanger 46. .

  Intermediate pipe 28, first three-way valve 39, connection pipe 38, second heating heat exchanger 52b, second three-way valve 40, return pipe 34 of circulation pipe 33, circulation pump 36, boiling heat exchanger 46, the return pipe 35 of the circulation pipe 33, the regulating valve 41, the first heat exchanger 52a for heating, and the other lower pipe 29b, from the middle part (including the upper part) of the hot water storage tank 21 to the second heating heat After passing through the exchanger 52b, a heating circulation path 62 is formed which passes through the boiling heat exchanger 46 and the first heating heat exchanger 52a in order and returns to the middle part (including the lower part) of the hot water storage tank 21. Yes. This heating circuit 62 is shared with the defrosting circuit.

  One lower pipe 29a, second three-way valve 40, outgoing pipe 34 of circulation pipe 33, circulation pump 36, heat exchanger 46 for boiling, return pipe 35 of circulation pipe 33, regulating valve 41, first heating By the heat exchanger 52a and the other lower pipe 29b, the heating heating circulation returns from the lower part of the hot water storage tank 21 to the lower part of the hot water storage tank 21 through the boiling heat exchanger 46 and the first heating heat exchanger 52a in order. A path 63 is formed.

  The boiling circulation path 61, the heating circulation path 62, and the heating heating circulation path 63 include a second three-way valve 40, an outgoing pipe 34 of the circulation pipe 33, a circulation pump 36, and a heating heat exchanger 46. The return pipe 35 of the circulation pipe 33 and the adjustment valve 41 are shared.

  Then, the first three-way valve 39, the second three-way valve 40, and the adjusting valve 41 are provided with a circulation path switching means 66 for switching between the boiling circulation path 61, the heating circulation path 62, and the boiling heating circulation path 63. It is configured.

  With respect to the first heating heat exchanger 52a and the second heating heat exchanger 52b, the circulation direction of the circulating water in the heating circuit 55 and the circulation direction of the circulating water in the heating circuit 62 are opposite to each other. Connected to be.

  Further, a hot water supply pipe 72 of a hot water supply path 71 is connected to the connection pipe 38, and the hot water supply pipe 72 and the water supply pipe 30 are connected to a hot water supply electric mixing valve 73 and a bath electric mixing valve 74, respectively. The electric mixing valve 73 for hot water supply and the electric mixing valve 74 for bath mix water from the water supply pipe 30 and hot water from the hot water supply pipe 72, and are installed in a main remote controller installed in a kitchen or the like and in a bathroom, for example. Hot water is supplied at a hot water set temperature set by a bathroom remote controller.

  A flow rate sensor 76 for detecting the flow rate of hot water and a thermistor 77 for detecting the temperature of the hot water are provided in a hot water supply pipe 75 for supplying hot water from the electric mixing valve 73 for hot water supply to the kitchen or the like. Also, a hot water supply pipe 78 for supplying hot water from the electric mixing valve 74 for bath to the bathtub 15 is provided with a hopper 79 having a flow rate sensor for detecting the flow rate of hot water and a hot water temperature sensor for detecting the temperature of hot water. Has been.

  Also, a bath heat exchanger 81 is disposed between the upper connection port 22 and the intermediate connection port 23 in the upper part of the hot water storage tank 21, and the bath heat exchanger 81 and the bathtub 15 are connected to the bath circulation path. They are connected by 82 forward 83 and return 84. In the forward path 83, a bath circulation pump 85 for circulating the bath water is provided. A bath hot water supply pipe 78 is connected to the bath circulation path 82 via a bath three-way valve 86, and automatic hot water filling to the bathtub 15 is possible.

  Further, the main body unit 12 is provided with a control unit 91 that controls the hot water supply / room heating device 11. The control unit 91 receives signals from detection means such as sensors and thermistors (25a to 25e), the heat pump unit 13, the heating unit 14, the three-way valves 39 and 40, the adjustment valve 41, and the mixing valves 73 and 74. Controls the circulation pump 85 for bath, the three-way valve 86 for bath, and the like.

  That is, the control unit 91 switches to the boiling circulation path 61 at the time of boiling and operates the heat pump unit 13 in the boiling cycle, switches to the heating circulation path 62 at the time of heating, and switches to the heating heating circulation path at the time of boiling heating. While switching to 63, the heat pump unit 13 is operated in the boiling cycle, and during defrosting, the circuit is switched to the heating circuit 62 and the heat pump unit 13 is operated in the reverse cycle.

  Next, the operation of the present embodiment will be described.

  First, referring to FIG. 2, the boiling operation (hot water storage operation) will be described.

  After starting the operation of the heat pump unit 13 in the boiling cycle, the three-way valves 39 and 40 and the regulating valve 41 form the boiling circulation path 61 and drive the circulation pump 36.

  As a result, the water taken out from the lower connection port 24a of the hot water storage tank 21 is used as one of the lower pipe 29a, the second three-way valve 40, the return pipe 34 of the circulation pipe 33, the circulation pump 36, and the heat for heating the heat pump unit 13. It circulates to the hot water storage tank 21 through the exchanger 46, the return pipe 35 of the circulation pipe 33, the adjustment valve 41, the connection pipe 38, the first three-way valve 39 and the upper pipe 27.

  Then, the water taken out from the lower connection port 24a of the hot water storage tank 21 is boiled to the boiling target temperature by the boiling heat exchanger 46 of the heat pump unit 13, and the heated water is returned to the upper part of the hot water storage tank 21 to store the hot water. Hot water is stored sequentially from the upper part of the tank 21 downward.

  Next, referring to FIG. 3, a heating operation using hot water in the hot water storage tank 21 will be described. This heating operation is possible when the temperature of the hot water in the intermediate portion of the hot water storage tank 21 detected by the intermediate thermistor 25c is equal to or higher than a predetermined temperature that can be used for heating.

  The three-way valves 39 and 40 and the regulating valve 41 form a heating circulation path 62 and drive the circulation pump 36. Thereby, the hot water taken out from the intermediate connection port 23 of the hot water storage tank 21 is circulated through the intermediate pipe 28, the first three-way valve 39, the connection pipe 38, the second heating heat exchanger 52b, the second three-way valve 40, and the circulation. A hot water storage tank via an outgoing pipe 34 of the pipe 33, a circulation pump 36, a heating heat exchanger 46, a return pipe 35 of the circulation pipe 33, a regulating valve 41, a first heat exchanger 52a for heating, and another lower pipe 29b Circulate to the bottom of 21.

  In the heating unit 14, the heating circulation pump 54 of the heating circuit 55 is driven. Thereby, the circulating water in the heating circuit 55 is circulated in the order of the heating circulation pump 54, the first heating heat exchanger 52a, the second heating heat exchanger 52b, and the heating panel 53.

  In the flow of hot water in the heating circulation path 62, first, the primary hot water taken out from the hot water storage tank 21 is heat-exchanged with the circulating water in the heating circuit 55 in the second heating heat exchanger 52b. The secondary hot water whose temperature has decreased by the amount of heat exchange is exchanged with the circulating water in the heating circuit 55 by the first heating heat exchanger 52a, and the hot water whose temperature has been further reduced by this heat exchange is stored in the hot water storage tank 21. Return to the bottom.

  In the flow of circulating water in the heating circuit 55, first, the circulating water whose temperature has dropped through the heating panel 53 exchanges heat with the secondary hot water flowing through the heating circulation path 62 in the first heating heat exchanger 52a. Subsequently, the circulating water whose temperature has been increased by this heat exchange exchanges heat with the primary hot water at a higher temperature than the secondary hot water flowing through the heating circulation path 62 in the second heating heat exchanger 52b. Subsequently, the circulating water whose temperature has been increased by this heat exchange flows into the heating panel 53 and heats it.

  Therefore, while the circulation pump 36 is shared by the heating circulation path 61 and the heating circulation path 62, during heating, the hot water taken out from the hot water storage tank 21 first passes through the second heating heat exchanger 52b. After the heat exchange, the hot water whose temperature has decreased due to the heat exchange flows to the circulation pump 36 and further flows to the first heating heat exchanger 52a, so the heat until the hot water reaches the second heating heat exchanger 52b. The heat exchange efficiency in the heating circuit 55 can be improved and the heating capacity can be improved by performing the heat exchange step by step in the second heating heat exchanger 52b and the first heating heat exchanger 52a while the loss is small. In addition, the thermal influence on the circulation pump 36 can be reduced.

  Further, since the circulation direction of the heating circuit 55 and the circulation direction of the heating circulation path 62 are connected to the first and second heating heat exchangers 52a and 52b in opposite relations, The temperature of the circulating water can be increased by gradually exchanging heat from the low temperature hot water to the high temperature hot water in the heating circuit 62, and the overall heat exchange efficiency is improved, and the temperature of the circulating water in the heating circuit 55 is improved. Can be increased. Therefore, it is possible to shorten the time required to reach the heating set temperature, to reduce the size of the heating panel 53, and to perform heating in a cold region.

  Moreover, the hot water taken out from the hot water storage tank 21 can be returned to the lower part of the hot water storage tank 21 in a state where the temperature has sufficiently decreased after passing through the second heating heat exchanger 52b and the first heating heat exchanger 52a. Therefore, reheating by the heat pump unit 13 is possible, and boiling operation or boiling heating operation in which heating is performed while boiling by the heat pump unit 13 can be performed.

  Next, in FIG. 4, the heating and heating operation for heating while performing boiling with the heat pump unit 13 will be described. This boiling heating operation is performed when heating is performed during the boiling operation, when the temperature of the hot water in the intermediate portion of the hot water storage tank 21 detected by the intermediate thermistor 25c is equal to or lower than a predetermined temperature that can be used for heating. Is called.

  After starting the operation of the heat pump unit 13 in a boiling cycle, the three-way valves 39 and 40 and the regulating valve 41 form a boiling heating circulation path 63 to drive the circulation pump 36. As a result, the water taken out from the lower connection port 24a of the hot water storage tank 21 is supplied to one lower pipe 29a, the second three-way valve 40, the return pipe 34 of the circulation pipe 33, the circulation pump 36, the boiling heat exchanger 46, It circulates in the lower part of the hot water storage tank 21 through the return pipe 35 of the circulation pipe 33, the regulating valve 41, the first heating heat exchanger 52a, and the other lower pipe 29b.

  Then, in the hot water flow in the boiling heating circuit 63, the water taken out from the lower connection port 24a of the hot water storage tank 21 is heated to the boiling target temperature by the boiling heat exchanger 46 of the heat pump unit 13, and this boiling is performed. The raised hot water is heat-exchanged with the circulating water of the heating circuit 55 by the first heating heat exchanger 52a, and the hot water whose temperature is further lowered by this heat exchange is returned to the lower part of the hot water storage tank 21.

  On the other hand, in the flow of the circulating water in the heating circuit 55, the circulating water whose temperature has dropped through the heating panel 53 exchanges heat with the hot water flowing in the heating circuit 62 in the first heating heat exchanger 52a. The circulating water whose temperature has been increased by the exchange flows to the heating panel 53 and heats it.

  Further, by adjusting the regulating valve 41, the hot water boiled up by the heating heat exchanger 46 of the heat pump unit 13 is distributed to the first heating heat exchanger 52a side and the upper side of the hot water storage tank 21, thereby storing hot water. Heating can be performed while storing hot water in the upper part of the tank 21.

  Next, the defrosting operation in the case where frost is attached to the evaporator 48 of the heat pump unit 13 during, for example, the boiling heating operation in FIG. 5 will be described.

  After switching the heat pump unit 13 to the reverse cycle and starting operation, the three-way valves 39 and 40 and the regulating valve 41 form the heating circulation path 62 and drive the circulation pump 36. Thereby, the hot water taken out from the intermediate connection port 23 of the hot water storage tank 21 is circulated through the intermediate pipe 28, the first three-way valve 39, the connection pipe 38, the second heating heat exchanger 52b, the second three-way valve 40, and the circulation. A hot water storage tank via an outgoing pipe 34 of the pipe 33, a circulation pump 36, a heating heat exchanger 46, a return pipe 35 of the circulation pipe 33, a regulating valve 41, a first heat exchanger 52a for heating, and another lower pipe 29b Circulate to the bottom of 21.

  In the heating unit 14, the heating circulation pump 54 of the heating circuit 55 is continuously driven. That is, the circulating water in the heating circuit 55 is circulated in the order of the heating circulation pump 54, the first heating heat exchanger 52 a, the second heating heat exchanger 52 b, and the heating panel 53.

  In the flow of hot water in the heating circulation path 62, first, the primary hot water taken out from the hot water storage tank 21 is heat-exchanged with the circulating water in the heating circuit 55 in the second heating heat exchanger 52b. Then, the secondary hot water whose temperature has been lowered by the amount of heat exchange is exchanged with the refrigerant in the refrigerant circuit 44 by the boiling heat exchanger 46, and the secondary hot water whose temperature has been further lowered by the amount of this heat exchange is the first. The heat exchanger for heating 52a exchanges heat with the circulating water in the heating circuit 55, and the hot water whose temperature is further lowered by this heat exchange is returned to the lower part of the hot water storage tank 21.

  In the flow of circulating water in the heating circuit 55, first, the circulating water whose temperature has dropped through the heating panel 53 exchanges heat with the secondary hot water flowing through the heating circulation path 62 in the first heating heat exchanger 52a. Subsequently, the circulating water whose temperature has been increased by this heat exchange exchanges heat with the primary hot water at a higher temperature than the secondary hot water flowing through the heating circulation path 62 in the second heating heat exchanger 52b. Subsequently, the circulating water whose temperature has been increased by this heat exchange flows into the heating panel 53 and heats it.

  In the refrigerant flow in the refrigerant circuit 44, the refrigerant that has passed through the evaporator 48 and the expansion valve 47 exchanges heat with the secondary hot water flowing in the heating circulation path 62 in the boiling heat exchanger 46, and this heat exchange The refrigerant that has absorbed heat is compressed to a high temperature and a high pressure by the compressor 45 and flows to the evaporator 48, and the temperature of the evaporator 48 is increased to defrost.

  Therefore, at the time of this defrosting, by switching to the heating circulation path 62 and operating the heat pump unit 13 in the reverse cycle, the hot water taken out from the intermediate portion of the hot water storage tank 21 first passes through the second heating heat exchanger 52b. Heat exchange with the heating circuit 55 can sufficiently raise the temperature of the circulating water in the heating circuit 55, and the hot water that has passed through the second heating heat exchanger 52b maintained a sufficient temperature for defrosting. As it is, it flows into the heat exchanger 46 for boiling of the heat pump unit 13 and exchanges heat with the refrigerant circuit 44, and the evaporator 48 of the heat pump unit 13 can be defrosted, and further passes through the heat exchanger 46 for boiling of the heat pump unit 13. The hot water exchanges heat with the heating circuit 55 via the first heating heat exchanger 52a, and the circulating water of the heating circuit 55 can absorb heat even a little, so that defrosting can be performed in a short time and Sometimes enough Heating operation can be performed with a reasonable heating capacity.

  Even when switching to the defrosting operation at the time of boiling heating where the heat pump unit 13 is operated in the boiling cycle by switching to the boiling heating circuit 63, the heating operation can be continued with sufficient capacity.

  Next, the hot water supply operation will be described.

  When hot water is used in a shower in the kitchen or bathroom, the hot water is discharged from the hot water supply pipe 75. The hot water supply electric mixing valve 73 mixes the hot water taken out from the hot water storage tank 21 and the water supplied from the water supply pipe 30 to the hot water supply set temperature. Supply hot water.

  Similarly, when hot water is added to the bathtub 15 or hot water is added, the hot water is discharged from the hot water supply pipe 78 for bath, and the hot water taken out from the hot water storage tank 21 and the water supplied from the water supply pipe 30 are mixed with the electric mixing valve 74 for bath. Then, hot water having a bath set temperature is supplied to the bathtub 15.

  At the time of this hot water supply, the first three-way valve 39 supplies medium-temperature water at an intermediate height of the hot water storage tank 21 through the intermediate pipe 28. For example, when high-temperature hot water is required like a dishwasher, the first three-way valve 39 The hot water in the upper part of the hot water storage tank 21 is supplied through the upper pipe 27.

  The first heating heat exchanger 52a and the second heating heat exchanger 52b of the heating circuit 55 are not limited to one each, and a plurality of either one or both of them may be provided. Good.

  Moreover, even if only at least the second heating heat exchanger 52b of the heating circuit 55 is provided, the hot water taken out from the intermediate portion of the hot water storage tank 21 is heated through the second heating heat exchanger 52b at the time of defrosting. Heat can be exchanged with the circuit 55, and the temperature of the circulating water in the heating circuit 55 can be sufficiently increased, and the hot water having passed through the second heating heat exchanger 52b remains at a sufficient temperature for defrosting. It flows into the heat exchanger 46 for boiling of the heat pump unit 13 and exchanges heat with the refrigerant circuit 44, so that the evaporator 48 of the heat pump unit 13 can be defrosted. Can be operated with sufficient heating capacity.

  The hot water that has passed through the first heating heat exchanger 52 a is not limited to the lower part of the hot water storage tank 21, but may be returned to the intermediate part of the hot water storage tank 21.

  Moreover, although the example applied to the hot water supply and heating apparatus 11 capable of supplying hot water and heating has been described in the above embodiment, the present invention can also be applied to a heating apparatus dedicated to heating without hot water supply.

It is a lineblock diagram of the hot-water supply heating device which shows one embodiment of the present invention. It is explanatory drawing which shows the boiling operation of the hot-water supply heating apparatus same as the above. It is explanatory drawing which shows the heating operation of a hot-water supply heating apparatus same as the above. It is explanatory drawing which shows the boiling heating operation of the hot-water supply heating apparatus same as the above. It is explanatory drawing which shows the defrost driving | operation of a hot-water supply heating apparatus same as the above.

Explanation of symbols

11 Hot water heater
13 Heat pump unit
21 Hot water storage tank
44 Refrigerant circuit
45 Compressor
46 Heat exchanger for boiling
48 Evaporator
52a The first heating heat exchanger as a heating heat exchanger
52b A second heating heat exchanger as a heating heat exchanger
55 Heating circuit
61 Boiling circuit
62 Heating circuit
63 Heating circuit for heating
66 Circuit switching means
71 Hot water supply path
91 Control unit

Claims (5)

A hot water storage tank,
It has a refrigerant circuit equipped with a compressor, a boiling heat exchanger, and an evaporator, and operates at a boiling cycle in which the refrigerant flows in the order of the compressor, the boiling heat exchanger, and the evaporator during boiling. A heat pump unit that operates in a reverse cycle relative to the boiling cycle during frost,
A heating circuit having a heat exchanger for heating;
A boiling circuit for returning from the hot water storage tank to the hot water storage tank via a heating heat exchanger;
A heating circuit that passes from the hot water storage tank through a heating heat exchanger and then returns to the hot water storage tank through a boiling heat exchanger;
Circuit switching means for switching between the boiling circuit and the heating circuit;
At the time of boiling, the circuit is switched to the circuit for heating by the circuit switching means, and the heat pump unit is operated in the boiling cycle, the circuit is switched to the circuit for heating by the circuit switching means at the time of heating, and the circuit is switched at the time of defrosting. And a controller for switching the heating circuit to a heating circuit and operating the heat pump unit in a reverse cycle. A hot water storage tank,
It has a refrigerant circuit equipped with a compressor, a boiling heat exchanger, and an evaporator, and operates at a boiling cycle in which the refrigerant flows in the order of the compressor, the boiling heat exchanger, and the evaporator during boiling. A heat pump unit that operates in a reverse cycle relative to the boiling cycle during frost,
A heating circuit having a first heating heat exchanger and a second heating heat exchanger connected in series;
A boiling circuit for returning from the hot water storage tank to the hot water storage tank via a heating heat exchanger;
A heating circuit that passes through the second heating heat exchanger from the hot water tank and then returns to the hot water tank through the boiling heat exchanger and the first heating heat exchanger in order,
Circuit switching means for switching between the boiling circuit and the heating circuit;
At the time of boiling, the circuit is switched to the circuit for heating by the circuit switching means, and the heat pump unit is operated in the boiling cycle, the circuit is switched to the circuit for heating by the circuit switching means at the time of heating, and the circuit is switched at the time of defrosting. And a controller for switching the heating circuit to a heating circuit and operating the heat pump unit in a reverse cycle. A boiling heating circuit that returns from the hot water storage tank to the hot water storage tank through the boiling heat exchanger and the first heating heat exchanger in order,
The heating device according to claim 2, wherein the control unit switches to the heating heating circulation path by the circulation path switching means during boiling heating and operates the heat pump unit in a boiling cycle. The order of the circulation direction of the heating circuit and the order of the circulation direction of the heating circulation path are connected in reverse to the first and second heating heat exchangers. Heating system. A heating device according to any one of claims 1 to 4,
A hot water supply and heating device comprising a hot water supply passage for supplying hot water in a hot water storage tank.

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