KR101436247B1 - Heat pump heat source system - Google Patents

Abstract

Provided is a heat pump heat source system that prevents a decrease in the efficiency of a heat pump and performs boiling operation and heating operation when execution requests for boiling operation and heating operation are made.
(Preferred Embodiment) The priority mode switching section 153 is a mode switching section that, when a heating execution condition and a boiling execution condition are established together, a storage priority mode for prohibiting the execution of the heating operation and permitting the execution of the boiling operation, And the heating priority mode for permitting the execution of the heating operation is switched based on the efficiency of the heat pump 51 and the single operation of the boiling operation or the heating operation is executed.

Description

[0001] HEAT PUMP HEAT SOURCE SYSTEM [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump heat source system that performs heating of hot water in a hot water tank by a heat pump and heating of a heat medium circulating in a heating circulation path to which a heating terminal is connected .

BACKGROUND ART Conventionally, a heat pump circulation path in which a heat medium of a heat pump is circulated, a tank circulation path in which hot water in a storage tank is circulated, and a heating circulation path in which a heating terminal is connected and a heating heat medium circulates, And a heat pump heat exchanger for performing heat exchange between the hot water in the heating circulation path and the heating heat medium in the heating circulation path (see, for example, Patent Document 1).

In the heat pump heat source system described in Patent Document 1, when the hot water supply operation for hot water supply from the storage tank and the heating operation for heating by the heat pump by circulating the heating heat medium in the heating circulation path are simultaneously performed, The boiling water is circulated through the tank circulation path to circulate the hot water in the storage tank to reduce the flow rate of the heating heat medium from the heating circulation path to the heat pump heat exchanger or to stop the circulation of the heating heat medium, And the operation is performed.

Patent Document 1: JP-A-2009-250481

In the heat pump heat source system described in Patent Document 1, when the hot water in the storage tank is disconnected, the circulation amount of the heating heat medium to the heat pump heat exchanger is reduced to perform simultaneous operation of boiling operation and heating operation, The operation is stopped and only the boiling operation is performed.

In this way, when the boiling operation and the heating operation are simultaneously performed, heat exchange may be performed between the heating heat medium and the hot water in the heat pump heat exchanger. The temperature of the heating heat medium flowing into the heat pump heat exchanger from the heating circulation path (temperature returning from the heating terminal) is generally higher than the temperature (water supply temperature) of the hot water flowing into the tank circulation path from the storage tank. , In the heat pump heat exchanger, the hot water in the tank circulation path is heated by the heat radiation from the heating heat medium, and the temperature of the hot water rises.

Here, since the efficiency of the heat pump is lowered as the temperature of the water to be supplied to the heat pump heat exchanger is higher, heat is radiated from the heating heat medium to the hot water in the heat pump heat exchanger and the temperature of the hot water rises. .

SUMMARY OF THE INVENTION The present invention has been made in view of this background and provides a heat pump heat source system capable of preventing boiling operation and heating operation from being carried out while preventing the efficiency of the heat pump from lowering, The purpose.

The present invention has been made in order to achieve the above object,

A storage tank in which a water supply pipe is connected to a lower portion thereof, a hot water supply pipe is connected to an upper portion thereof, and water supplied from the water supply pipe is stored;

A tank circulation path connecting the lower part and the upper part of the storage tank,

A tank circulation pump circulating water stored in a lower portion of the storage tank to the upper portion of the storage tank through the tank circulation path,

A heating circulation path to which the heating terminal is connected,

A heating circulation pump circulating a heating medium in the heating circulation path,

A heat pump having a heat pump circulation path for heating a heat pump heat medium circulating in the heat pump circulation path,

The heat pump circulation path, the tank circulation path, and the heating circulation path to perform heat exchange between the heat pump heating medium circulating in the heat pump circulation path and the hot water circulating in the tank circulation path, A heat pump heat exchanger for performing heat exchange between the heat pump heating medium circulating in the heating circulation path and the heating heat medium circulating in the heating circulation path,
The heating circulation pump and the heat pump are operated by the user when the heating start operation of the floor heating remote control and the heating execution condition that is the start time of the timer operation are established, A heating control unit for performing a heating operation for heating the heating medium to perform heating by the heating terminal;
When the boiling operation condition in which the storage tank is in the boiling water cut-off state is established, the tank circulation pump and the heat pump are operated so that the hot water from the storage tank circulating in the tank circulation path is cooled to a predetermined boiling temperature And a tank control unit for performing boiling operation for heating the heat pump to a predetermined temperature,

A storage priority mode in which the execution of the heating operation is prohibited and the execution of the boiling operation is permitted when the heating execution condition and the boiling execution condition are established together, and a heat storage priority mode in which the execution of the boiling operation is prohibited And a priority mode switching section for switching the heating priority mode allowing the heat storage heat pump efficiency to be higher than the heating heat pump efficiency in the boiling operation or the heating operation so as to perform the sole operation of the boiling operation or the heating operation, .

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In the heat pump heat source system of the present invention,

A storage priority mode for prohibiting execution of the heating operation and permitting execution of the boiling operation when the heating execution condition and the boiling execution condition are established together; And a heating mode switching unit for switching the heating priority mode in accordance with a predetermined mode switching condition so as to perform the sole operation of the boiling operation or the heating operation (first invention).

According to the first aspect of the present invention, when the heating execution condition and the boiling execution condition are established together, the heat storage priority mode and the heating priority mode are switched by the priority mode switching unit, and the boiling operation or the heating operation Is performed. Therefore, simultaneous operation of the boiling operation and the heating operation is prohibited, and by this simultaneous operation, in the heat pump heat exchanger, the heating heat medium flowing in the heating circulation path and the hot water flowing in the tank circulation path It is possible to prevent the efficiency of the heat pump from deteriorating due to heat exchange.

Further, in the first invention,

A tank return temperature sensor for detecting the temperature of the hot water flowing into the heat pump heat exchanger from the tank circulation path,

And a heating return temperature sensor for detecting the temperature of the heating heat medium flowing into the heat pump heat exchanger from the heating circulation path,

Wherein the priority mode switching unit switches the priority mode switching unit to the heat pump heat exchanger in such a manner that the heating mode switching unit switches the priority mode switching unit between the heat storage pump efficiency and the heat storage efficiency of the heat pump when heating the hot water of the temperature detected by the tank return temperature sensor flowing from the tank circulation path to the boiling temperature , The heating heat pump efficiency, which is the efficiency of the heat pump when heating the heating heat medium having the detection temperature detected by the heating return temperature sensor flowing from the heating circulation path to a predetermined heating hot water temperature, is obtained in the heat pump heat exchanger , The heat storage priority mode is set when the heat storage heat pump efficiency is higher than the heating heat pump efficiency and the heating priority mode is set when the heat storage heat pump efficiency is higher than the heat storage heat pump efficiency (Second invention).

According to the second aspect of the present invention, the priority mode switching unit switches the priority mode switching unit such that the efficiency of the heat pump, which is the efficiency of the heat pump when performing the boiling operation, and the efficiency of the heat pump, The pump efficiency is obtained. When the efficiency of the heat storage pump is higher than the efficiency of the heat pump, the heat storage priority mode is set. When the efficiency of the heat pump is higher than the efficiency of the heat storage pump, It is possible to preferentially perform the heating operation in which the efficiency of the heat pump is increased during the heating operation.

Further, in the first invention,

Wherein the heating control unit operates the heat pump at a predetermined capacity or higher to intermittently perform the heating operation when the heating execution condition and the boiling execution condition are established together,

Wherein the priority mode switching section sets the heating priority mode during the execution of the heating operation and sets the heat storage priority mode during the stop of the heating operation when the heating operation is intermittently performed by the heating control section (Third invention).

According to the third aspect of the present invention, the heating control section performs the heating operation at high speed by interrupting the heating operation by increasing the capacity of the heat pump, thereby performing the boiling operation by the tank control section during the stop of the heating operation . Therefore, the heating operation and the boiling operation can be switched for a short time, and the boiled water in the storage tank can be heated to the boiling temperature while securing the heating effect by the heating operation.

Further, in any one of the first to third inventions,

Wherein the tank control unit sets the total amount of the hot water in the storage tank to be heated up to the boiling temperature by the execution of the boiling operation when the heating execution condition and the boiling execution condition are established together, (The fourth invention), the boiling operation condition is satisfied.

According to the fourth invention, the time required for the boiling operation can be shortened, and the waiting time from the boiling operation to the heating operation can be reduced.

1 is a schematic view of a heat pump heat source system
Fig. 2 is a flow chart of the first flowchart of the heating operation and boiling operation
Fig. 3 is a flowchart of the second flowchart of the heating operation and the boiling operation
Fig. 4 is an explanatory diagram of a correspondence map of the efficiency / heading temperature
5 is a timing chart when the heating operation is executed intermittently

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to Figs. 1, the heat pump heat source system of the present embodiment includes a low temperature unit 10, a heat pump unit 50, a gas heat source unit 80, and a controller 150 for controlling the overall operation of the heat pump heat source system .

The low temperature unit (10) has a storage tank (11), a water supply pipe (12), a hot water supply pipe (13), and the like. The storage tank 11 stores hot water therein, and tank temperature sensors 14 to 17 are provided at substantially equal intervals in the height direction. At the bottom of the holding tank 11, there is provided a drain valve 18 which is opened by manual operation of the operator.

The other end of the water supply pipe 12 is connected to the lower portion of the storage tank 11 to supply water to the lower portion of the storage tank 11. [ The water supply pipe 12 is provided with a pressure reducing valve 19 for preventing the internal pressure of the storage tank 11 from becoming excessive and a check valve 19 for preventing the water from flowing from the storage tank 11 to the water supply pipe 12 20 are installed.

The water supply pipe 12 is connected to the hot water supply pipe 13 through the tank mixing valve 21 and is connected to the hot water supply pipe 13 from the storage tank 11 by the tank mixing valve 21, The mixing ratio of water supplied to the hot water supply pipe from the water supply pipe 12 is changed. The water supply pipe 12 is provided with a water temperature sensor 22 for detecting the temperature of water in the water supply pipe 12, a water flow rate sensor 23 for detecting the flow rate of water flowing through the water supply pipe 12, 13 for preventing the flow of the hot water from the water supply pipe 12 is provided.

The hot water supply pipe 13 has one end connected to the hot water supply port 31 and the other end connected to the upper portion of the storage tank 11. [ The hot water stored in the upper portion of the storage tank 11 is supplied to a hot water tap (a kitchen, a toilet, a bathroom faucet, a shower, etc.) not shown via a hot water supply port 31. The hot water supply pipe 13 is provided with a backflow prevention valve 25 for preventing inflow of hot water from the hot water supply pipe 13 to the storage tank 11 and a hot water temperature sensor 26 for detecting the temperature of the hot water in the hot water supply pipe 13 And a hot water flow sensor 27 for detecting the flow rate of the hot water flowing through the hot water supply pipe 13 are provided.

The bypass pipe 33 (bypass pipe 33a) connected to the gas heat source unit 80 is connected to the hot water supply pipe 13 on the downstream side of the connection portion with the branch pipe of the water supply pipe 12, And a bypass return pipe 33b) are interposed. A hot water temperature sensor 28 is provided between the connecting portion of the hot water supply pipe 13 with the bypass transfer pipe 33a and the tank mixing valve 21 and the bypass return pipe 33b of the hot water supply pipe 13, And a mixed water / water temperature sensor 32 is provided between the connecting portion with the hot water supply port 31 and the hot water supply port 31.

Between the connection portion of the hot water supply pipe 13 with the bypass transfer pipe 33a and the connection portion between the bypass return pipe 33b and the bypass pipe 33a, A path control valve 29 is provided. A heating heat pump return temperature sensor (not shown) for detecting the temperature of hot water returning from the heating circulation path (40) to the heat pump unit (50) is connected to the heating circulation path (40) connected to the heat pump unit (50) A heating heat pump supply temperature sensor 46 for detecting the temperature of the hot water heated by the heat pump unit 50 and tapping into the heating circulation path 40, The heat pump bypass path 42 bypasses the heating circulation path 40 and the heat pump bypass path 42 is provided at a downstream side 42 for detecting the temperature of the hot water mixed with the hot water.

A heating-side mixing valve 48 for adjusting the ratio of the hot water flowing to the heating circulation path 40 side to the hot water flowing to the heat pump bypass path 42 is provided. The tank circulation path 41 connected to the heat pump unit 50 is provided with a tank downstream temperature sensor 34 for detecting the temperature of the hot water supplied from the storage tank 11 to the tank circulation path 41.

A detection signal of each sensor provided in the hot water unit (10) is input to the controller (150). The operation of the tank mixing valve 21, the bypass control valve 29, and the heating-side mixing valve 48 is controlled by a control signal output from the controller 150. [

The heat pump unit 50 circulates hot water in the storage tank 11 through the tank circulation path 41 and heats the hot water circulating in the heating circulation path 40 Is heated. The heat pump unit 50 includes a heat pump 55 constituted by an evaporator 53, a compressor 54, a heat pump heat exchanger 55 (condenser), and an expansion valve 56 connected by a heat pump circulation path 52, (51).

The evaporator 53 is connected to the air supplied by the rotation of the fan 60 and the heat medium circulating in the heat pump circulation path 52 such as an alternative freon such as hydrofluorocarbon (HFC), carbon dioxide, Corresponding to the heat medium). The compressor 54 compresses the heating medium discharged from the evaporator 53 to a high pressure and a high temperature and sends it to the heat pump heat exchanger 55. The expansion valve (56) opens the pressure of the heating medium pressurized by the compressor (54).

The defrosting valve 61 is installed by bypassing the expansion valve 56 and defrosts the evaporator 53 by a heating medium sent out from the compressor 54. [ A heat medium temperature sensor (not shown) for detecting the temperature of the heat medium circulating in the heat pump circulation path 52 is provided on the upstream side and the downstream side of the expansion valve 56 of the heat pump circulation path 52 and on the upstream side and the downstream side of the compressor 54 62, 63, 64, and 65, respectively. The evaporator 53 is provided with an outside air temperature sensor 67 for detecting the temperature of the air sucked into the evaporator 53 (outside air temperature).

The heat pump heat exchanger 55 is connected to the tank circulation path 41 and is connected to the tank circulation path 41 by the heat exchange between the heating medium which has been brought into high pressure and high temperature by the compressor 54 and the hot water circulating in the tank circulation path 41 ) Is heated. The tank circulation path 41 is provided with a tank circulation pump 66 for circulating the tap water in the storage tank 11 through the tank circulation path 41.

The hot water stored in the lower portion of the storage tank 11 is led to the tank circulation path 41 by the tank circulation pump 66 and is heated by the heat pump heat exchanger 55 and returned to the upper portion of the storage tank 11 . On the upstream side and the downstream side of the heat pump heat exchanger 55 of the tank circulation path 41 are provided water tap water temperature sensors 68 and 69 for detecting the temperature of the hot water circulating in the tank circulation path 41. The heat pump heat exchanger 55 is provided with an atmospheric temperature sensor 57 for detecting the atmospheric temperature therein.

The heat pump heat exchanger 55 is connected to the heating circulation path 40. The heat pump heat exchanger 55 is connected to the heating circulation path 40 by the heat exchange between the heating medium which has been brought to high pressure and high temperature by the compressor 54 and the hot water circulating in the heating circulation path 40 40). ≪ / RTI >

The detection signals of the respective sensors provided in the heat pump unit 50 are input to the controller 150. [ The operation of the compressor 54, the tank circulation pump 66, and the fan 60 is controlled by the control signal output from the controller 150. [

Next, the gas heat source unit 80 is for heating the hot water supplied from the bypass pipe 33 and the hot water circulating in the heating circulation path 40, and the first burner 71 for hot water supply and the first The heating and auxiliary heat source 70 having the first heat exchanger 72 heated by the burner 71, the second burner 76 for heating and auxiliary heating, and the second burner 76 heated by the second burner 76, A heating auxiliary heat source 75 having a heat exchanger 77, a water supply pipe 85, a hot water supply pipe 86, an auxiliary heating heat exchanger 87, and the like.

The first burner 71 and the second burner 76 are supplied with the fuel gas from a gas supply pipe (not shown), and the combustion air is supplied by a combustion fan (not shown). The controller 150 controls the flow rates of the fuel gas and the combustion air to be supplied to the first burner 71 and the second burner 76 to adjust the combustion amount of the first burner 71 and the second burner 76 to .

The first heat exchanger 72 is connected to the water supply pipe 85 and the hot water supply pipe 86 and heats the water supplied from the water supply pipe 85 by the heat of combustion of the first burner 71, ). One end of the water supply pipe 85 is connected to the bypass transfer pipe 33a of the hot water unit 10 and water is supplied through the bypass transfer pipe 33a. One end of the hot water supply pipe 86 is connected to the bypass return pipe 33b of the hot water unit 10 and supplies the hot water from the hot water supply port 31 through the bypass return pipe 33b.

The water supply pipe 85 is provided with a water stop valve 93 and a water quantity sensor 88 in order from the upstream side. The water supply pipe 85 and the hot water supply pipe 86 are connected to each other by a bypass pipe 89. A quantity control valve 90 for controlling the opening degree of the bypass pipe 89 is connected to the bypass pipe 89, Respectively. On the downstream side of the first heat exchanger 72 of the hot water supply pipe 86 and the downstream side of the connection portion with the bypass pipe 89 is disposed a hot water temperature sensor for detecting the temperature of the hot water flowing in the hot water supply pipe 86 (91, 92), respectively.

With this configuration, when the temperature of the hot water supplied from the holding tank 11 to the hot water supply pipe 13 is lower than the set hot water temperature (hot water supply state), the water is supplied to the water supply pipe 85 through the bypass transfer pipe 33a The supplied water is heated by the first heat exchanger 72 to become water and mixed with the water from the bypass pipe 89 to be supplied to the hot water supply port 86 through the hot water supply pipe 86 and the bypass return pipe 33b 31).

The hot water supply pipe 86 is connected to the bathtub circulation path 102 connected to the bathtub 101 by the hot water filling pipe 100. The hot water filling pipe 100 is provided with a hot water filling valve 103 for opening and closing the hot water filling pipe 100 and a backflow prevention valve 104 for preventing inflow of hot water from the bathtub circulation path 102 to the hot water supply pipe 86, Respectively. The hot water filling valve 103 can be opened to supply the hot water from the hot water supply pipe 86 to the bath 101 through the hot water filling pipe 100 and the tub circulation path 102. [

The bath circulation path 102 is provided with a bath circulation pump 105 and an auxiliary heating heat exchanger 87 for circulating the hot water in the bath 101 through the bath circulation path 102. The auxiliary heating heat exchanger 87 is connected to the heating circulation path 40 through the auxiliary heating transfer pipe 107 and the auxiliary heating return pipe 108. The auxiliary heating transfer pipe 107 is provided with an auxiliary heating valve 109 for opening and closing the auxiliary heating transfer pipe 107.

The controller 150 operates the bath circulation pump 105 to open the auxiliary heating valve 109 while circulating the hot water in the bath 101 through the bath circulation path 102, The hot water is circulated and supplied to the auxiliary heating heat exchanger 87 from the heating circulation path 40 through the auxiliary heating transfer pipe 107 and the auxiliary heating return pipe 108 by activating the auxiliary heating heat exchanger 111, Supplement the boiled water.

The second heat exchanger 77 is installed in the middle of the heating circulation path 40 and heats the hot water flowing through the heating circulation path 40 by the heat of combustion of the second burner 76. The heating circulation path 40 is connected to the floor heater 200 (corresponding to the heating terminal of the present invention) and the hot air heater 210 in addition to the second heat exchanger 77 to supply heat by the hot water.

The heat pump heat exchanger 55 and the second heat exchanger 77 of the heating auxiliary heat source 75, the cistern 110 and the heating circulation pump 111 are connected to the heating circulation path 40 Is installed. The heating circulation path 40 is branched into a low temperature heating path 112 and a high temperature heating path 130 at a position between the heating circulation pump 111 and the second heat exchanger 77.

A hot-air heater 210 is connected to the high-temperature heating furnace 130, and a floor heater 200 is connected to the low-temperature heating furnace 112. The high temperature heating path 130 and the low temperature heating path 112 are joined at the downstream side of the warm air heater 210 and the bottom heater 200. A heating bypass path 113 (which is branched from the high-temperature heating path 130 and communicates with the cen- tern 110) at a position between the connection portion of the high-temperature heating path 130 and the warm-air heating device 210 and the second heat exchanger 77, And a heating bypass control valve 114 for controlling the opening degree of the heating bypass path 113 is installed in the heating bypass path 113. [

A return hot water temperature sensor 115 for detecting the temperature of the hot water sent out from the heating circulation pump 111 is provided near the outlet of the heating circulation pump 111 of the heating circulation path 40. A supply hot water temperature sensor 116 for detecting the temperature of the hot water sent out from the second heat exchanger 77 is provided in the vicinity of the outlet of the second heat exchanger 77 of the heating circulation path 40.

The low temperature heating furnace 112 is connected to the bottom heater 200 through a thermal valve 120 and is connected to the bottom heater 200 The supply of hot water to and the stopping of hot water are switched. The supply and stop of the hot water from the hot heating path 130 to the hot air heater 210 are performed by opening and closing the thermo valve 211 provided in the hot air heater 210. [ A room temperature sensor 202 for detecting the temperature of a room in which the floor heater 200 is installed is connected to the floor heating remote controller 201 for operating the floor heater 200.

The floor heating remote controller 201 and the controller 150 are communicably connected and the data of the target heating temperature set by the floor heating remote controller 201 and the data of the temperature detected by the room temperature sensor 202 are inputted to the controller 150).

The heat source remote controller 160 is connected to the controller 150 in a communicable manner. The heat source remote controller 160 is provided with a display unit 161 for displaying the operating state and operating condition setting conditions of the heat pump heat source system and the like and an operating unit 162 for setting operating conditions and the like of the heat pump heat source system.

The user of the heat pump heat source system operates the operation unit 162 of the heat source remote controller 160 to instruct the boiling water boiling in the warming tank 11, the hot water supply temperature (set hot water temperature) from the hot water supply opening 31, And the hot water supply temperature (set hot water filling temperature) to the bath 101 can be set.

A detection signal of each sensor provided in the gas heat source unit 80 is input to the controller 150. [ The first burner 71, the second burner 76, the quantity control valve 90, the exponent valve 93, the hot water filling valve 103, the tub circulation The operation of the pump 105, the auxiliary heating valve 109, the heating circulation pump 111, the heating bypass control valve 114, and the thermo valve 120 is controlled.

The controller 150 is an electronic circuit unit configured by a not-shown CPU, memory, and the like. The CPU 150 executes a program for controlling the heat pump heat source system stored in the memory to control the heating control unit 151, the tank control unit 152, And a priority mode switching section 153, and controls the operation of the heat pump heat source system.

The heating control unit 151 executes the heating operation of the floor heater 200. [ The tank control unit 152 executes the boiling operation in which the hot water in the storage tank 11 is heated to the boiling temperature corresponding to the hot water supply temperature set by the heat source remote controller 160 (the set hot water temperature or the set hot water filling temperature) . The priority mode switching section 153 prohibits the execution of the heating operation and permits the execution of the boiling operation when the execution condition (heating execution condition) of the heating operation and the execution condition (boiling execution condition) of the boiling operation are established together And the heating priority mode in which the execution of the boiling operation is prohibited and the execution of the heating operation is permitted is switched to execute the heating operation or the boiling operation alone.

Next, the heating operation of the floor heater 200 by the controller 150 and the execution processing of boiling water boiling operation in the storage tank 11 will be described with reference to the flowcharts shown in Figs. 2 to 3. Fig.

STEP1 to STEP4 and STEP21 to STEP22 in Fig. 2 are processes by the heating control unit 151. Fig. In STEP1, the heating control section 151 determines whether or not the heating execution condition is established. The heating execution conditions include, for example, (1) a heating start operation of the floor heating remote control 201 is performed by the user, (2) a start time of the timer operation set by the floor heating remote control 201 Is set.

When the heating execution condition is established in STEP1, the process proceeds to STEP2. The heating control unit 151 controls the heating-side mixing valve 48 to switch the heating-side mixing valve 48 to the heat pump bypass path 42 side The circulation of the hot water is stopped and the first heating circulation state in which the hot water is circulated to the heat pump heat exchanger 55 side is made.

In the following STEP3, the heating control unit 151 turns on the heating circulation pump 111 and turns on the heat pump 51 in STEP4. The hot water circulating in the heating circulation path 40 in the heat pump heat exchanger 55 is heated by the heat medium circulating in the heat pump circulation path 52 and supplied to the bottom heater 200, Heating by the floor heater 200 is performed.

The following STEP5 to STEP7 are processing by the mode switching unit 153 first. The priority mode switching section 153 measures the detected temperature of the heating heat pump return temperature sensor 45 (corresponding to the heating return temperature sensor of the present invention) in STEP 5 and sets the detected temperature to " Efficiency / outflow temperature-correspondence map "to obtain the heating heat pump efficiency (the efficiency of the heat pump 51 when performing the heating operation).

4, the vertical axis is set to the efficiency (%) of the heat pump 51, the horizontal axis is set to the outgoing temperature (占 폚) from the heat pump heat exchanger 55, The efficiency of the heat pump 51 and the outflow from the heat pump heat exchanger 55 in the case where the inlet temperature to the heat pump heat exchanger 55 is 10 占 폚 (a in the drawing) and 35 占 폚 Temperature correspondence.

The " efficiency / outflow temperature-correspondence map " in Fig. 4 is obtained when the outdoor air temperature is 5 캜. Data of a plurality of " efficiency / outflow temperature-correspondence maps " corresponding to different outdoor air temperatures are stored in the memory of the controller 150. The mode switching section 153 firstly detects Select the "Efficiency / Outgoing Temperature-Corresponding Map" to be used according to the outside air temperature.

4 shows a case where the temperature of the hot water flowing into the heat pump heat exchanger 55 from the heating circulation path 40 in the heating operation is 35 DEG C and the hot water flowing out of the heat pump heat exchanger 55 to the heating circulation path 40 (Corresponding to the heating hot water temperature of the present invention) is 40 占 폚. That is, the priority mode switching section 153 obtains the efficiency of 300% corresponding to the outflow temperature of 40 占 폚 as the heating heat pump efficiency for the line b at the incoming temperature of 35 占 폚.

In next step 7, the mode switching section 153 first determines whether or not the boiling water boiling execution condition in the storage tank 11 is established. Here, as the boil-off condition, it is set that the boil-off water tank 11 is in the boil-off state. The boiling water shut-off of the holding tank 11 is performed by the following operations: (1) the operation of the hot water supply auxiliary heat source 70; (2) the detection temperature of the tank temperature sensor 17 is determined as hot water disconnection determination temperature ), And (3) the detected temperature of the hot water temperature sensor 26 is lowered to the hot water disconnection determining temperature or lower.

When the boiling execution condition is not established, the process returns to STEP 1 and the heating operation by the heating control unit 151 is continued. When the heating execution condition is not established in STEP1 (when the heating operation of the floor heating remote control 201 is performed by the user, the timer operation is ended, or the like), the operation branches to STEP21 and the heating control unit 151 , The heating circulation pump 111 is turned off (STOP), and in STEP 22, the heat pump 51 is turned OFF to terminate the heating operation, and the flow returns to STEP 1.

On the other hand, when the boiling execution condition is established in STEP7, the process proceeds to STEP8 in Fig. STEP8 to STEP9 are processes by the heating control section 151. [ The heating control unit 151 determines that the heating capability of the heat pump 51 is lower than the heating request capability (determined by the difference between the set temperature by the floor heating remote control 201 and the detected temperature of the room temperature sensor 202) Or more.

When the heating capacity of the heat pump 51 is higher than the heating required capacity, the process proceeds to STEP 9 where the heating control unit 151 sets the heating amount of the heat pump 51 to the heating request capability (the room temperature is maintained at the set heating temperature (For example, the maximum heating amount) exceeding the heating capacity of the floor radiator 200 required for the heating operation (corresponding to the predetermined capacity of the present invention).

In this case, when the detected temperature of the room temperature sensor 202 becomes equal to or higher than the set heating temperature + 5 占 폚, the heating control unit 151 causes the heating-side mixing valve 48 to switch the heating- The circulation of the hot water to the heat exchanger 55 is stopped and the second heating circulation state in which the hot water flows from the heating side mixing valve 48 to the heat pump bypass path 42 is made (heating stop).

When the detected temperature of the room temperature sensor 202 becomes equal to or lower than the set heating temperature -5 DEG C, the heating control section 151 controls the heating-side mixing valve 48 to switch the heating- The circulation of the hot water to the path 42 is stopped and the first heating circulation state in which the hot water flows from the heating side mixing valve 48 to the heat pump heat exchanger 55 is performed (heating operation).

When the heating operation is being executed by the heating control unit 151, the priority mode switching unit 153 sets the mode to the " heating priority mode ", and when the heating operation is not performed by the heating control unit 151, &Quot; The heating operation (heating operation using the heat pump heat exchanger 55 as a heat source) is being executed and stopped by the heating control unit 151 corresponds to the mode switching condition of the present invention.

5 (a) is a graph showing the relationship between the temperature (° C) and the flow rate (liters / min) in the vertical axis and the time in the horizontal axis, and the detection of the heating and mixing temperature sensor 47 (Heating mixing temperature) and the flow rate of the hot water circulating in the heating circulation path 40 by the heating circulation pump 111. [

Prior to t10 in Fig. 5 (a), the boiling water in the storage tank 11 is not broken and the heating operation is being performed. The heating mixing temperature is set at room temperature by the proportional control of the heat pump 51 It becomes a substantially constant temperature necessary for maintaining the set heating temperature.

In Fig. 5 (a), t10 to t14 indicate a state in which the hot water in the storage tank 11 is disconnected, and the heating operation is intermittently performed. In the period from t10 to t11 and t12 to t13 (heating execution period), the heating amount of the heat pump 51 is set to a fixed value (corresponding to STEP9 in Fig. 3) 200 is increased and the room temperature rises.

In the period from t11 to t12 and t13 to t14 (heating stop period) from the time when the room temperature becomes the set heating temperature + 5 deg. C or more to the time when the set heating temperature becomes the set heating temperature -5 deg. C or less , The circulation of the hot water from the heating circulation path 40 to the heat pump heat exchanger 55 is stopped, and the heating mixing temperature is gradually lowered.

Here, in the heating stop period, the second heating circulation state is established, and the hot water in the heating circulation path (40) is not distributed to the heat pump heat exchanger (55) side. Therefore, the tank circulation pump 66 is operated, and the hot water circulating in the tank circulation path 41 can be heated by the heat pump heat exchanger 55.

Therefore, when the heating stop period is terminated in STEP10, the process proceeds to STEP11. STEP11 to STEP14 are processing by the tank control unit 152. [ The tank control unit 152 turns on the tank circulation pump 66 in STEP11 and sets the second heating circulation state by the heating side mixing valve 48 in STEP12 so that the tank circulation pump 41 is switched from the heat pump heat exchanger 55 to the tank circulation path 41 ) Is controlled so that the temperature at which the hot water flows out to the boiling point of the heat pump 51 is equal to the boiling temperature.

The boiling temperature of the hot water in the storage tank 11 is set according to the following Table 1 in accordance with the hot water supply temperature (the set hot water temperature or the set hot water filling temperature) set by the heat source remote controller 160.

Set hot water temperature Boiling temperature Less than 40 ℃ 40 ℃ 40 ° C or more and less than 45 ° C 45 ° C 45 ° C or more and less than 50 ° C 50 ℃

The boiled water stored in the lower portion of the storage tank 11 is heated to the boiling temperature by the processing of STEP11 and STEP12 and is returned to the upper portion of the storage tank 11. [ Then, in STEP13, the tank control unit 152 determines whether the detected temperature of the tank temperature sensor 14 is equal to or higher than the set boiling temperature of 40 DEG C or not.

When the detected temperature of the tank temperature sensor 14 is lower than 40 DEG C, the flow returns to STEP8. On the other hand, when the detected temperature of the tank temperature sensor 14 reaches 40 DEG C or more, the process proceeds to STEP14, and the tank control unit 152 turns off the tank circulation pump 66 to terminate the boiling operation. The following STEPs 15 to 16 are processing by the heating control section 151.

The heating control unit 151 is brought into the first heating circulation state by the heating side mixing valve 48 and the hot water is supplied from the heating circulation path 40 to the heat pump heat exchanger 55 in STEP15. In step S16, the heating control unit 151 controls the heating amount of the heat pump 51 (temperature control) so as to reduce the temperature difference between the set heating temperature and the detected temperature of the room temperature sensor 202 2 to STEP1.

In STEP8, when the heating capacity of the heat pump 51 is equal to or less than the required heating capacity, there is no margin for the heating capacity of the heat pump 51, so that the execution and stop of the heating operation are switched I can not. Therefore, in this case, the process branches to STEP30.

STEP 30 to STEP 32 are processing by the priority mode switching section 153. The priority mode switching section 153 measures the detected temperature of the water-bladed temperature sensor 68 (corresponding to the tank return temperature sensor of the present invention) in STEP 30 and sets this detected temperature as the "efficiency / outflow temperature (Corresponding to the efficiency of the heat pump 51 at the time of boiling operation) is obtained.

4, the temperature of hot water (detected by the hot water temperature sensor 68) flowing into the heat pump heat exchanger 55 from the tank circulation path 41 in the boiling operation is 10 占 폚 and the heat pump heat exchanger 55) to obtain the heat storage heat pump efficiency when boiled water is heated to 45 ° C. That is, the efficiency of 350% corresponding to the outflow temperature of 45 占 폚 is obtained as the heat storage heat pump efficiency for a line having the inlet water temperature of 10 占 폚.

In next step 32, the mode switching section 153 determines whether or not the heat storage heat pump efficiency obtained in step 31 is higher than the heating heat pump efficiency obtained in step 6. When the heat storage heat pump efficiency is higher than the heating heat pump efficiency, the process proceeds to STEP11. The heat storage heat pump efficiency is higher than the heat pump efficiency, which corresponds to the mode switching condition of the present invention.

In this case, execution of the heating operation with the heat pump heat exchanger as the heat source is inhibited, and the " heat storage priority mode " In the "heat storage priority mode", the heating control unit 151 can perform the heating operation using the heating auxiliary heat source 75 as the heat source by operating the heating auxiliary heat source 75.

On the other hand, when the thermal efficiency of the heat accumulating heat pump is lower than the thermal efficiency of the heat pump in STEP 32, the flow branches to STEP8. In this case, execution of the boiling operation by the tank control unit 152 is prohibited, and the heating control unit 151 is set to the " heating priority mode " in which execution of the heating operation using the heat pump heat exchanger 55 as the heat source is permitted do.

In the heating priority mode, the controller 150 operates the hot water supply auxiliary heat source 70 so that when the hot water is supplied from the hot water supply port 31, The combustion amount of the first burner 71 is controlled such that the detected temperature of the hot water temperature sensor 92 becomes the set temperature (set hot water temperature or set hot water filling temperature).

When the room temperature becomes lower than the set heating temperature -5 占 폚 in the "heat accumulation preferential mode", the heating control unit 151 operates the heating auxiliary heat source 75 to heat the hot water in the heating circulation path 40 Is heated by the auxiliary heat source (75) and heated by the floor heater (200).

5 (a), when the detected temperature of the room temperature sensor 202 becomes equal to or higher than the set heating temperature + 5 ° C, the heating-side mixing valve 48 controls the first heating The circulation state is switched from the circulation state to the second heating circulation state to stop the flow of hot water from the heating circulation path 40 to the heat pump heat exchanger 55. When the detected temperature of the room temperature sensor 202 reaches the set heating temperature -5 DEG C or lower The heating-side mixing valve 48 switches from the second heating circulation state to the first heating circulation state and circulates the hot water from the heating circulation path 40 to the heat pump heat exchanger 55, .

However, as a process for intermittently executing the heating operation, as shown in Fig. 5 (b), during a period of operating the heating circulation pump 111 in a predetermined control cycle by PWM (Pulse Width Modulation) The heating operation may be performed intermittently by performing a process of changing the ratio of the temperature of the room temperature sensor 202 in accordance with the difference between the detected temperature of the room temperature sensor 202 and the set heating temperature.

Here, Fig. 5 (b) is a graph showing the relationship between the temperature (° C) and the flow rate (liters / min) on the ordinate axis and the heating axis 47) and the flow rate of the hot water circulating in the heating circulation path (40) by the operation of the heating circulation pump (111).

In t20 to t24 in Fig. 5 (b), the heating operation is performed in a state in which the hot water in the storage tank 11 is not interrupted, the heating circulation pump 111 is turned on / off according to the PWM duty, The off period (t21 to t22, t23 to t24) in which the hot water flow rate is zero and the on period (t20 to t21, t22 to t23) in constant flow rate are switched.

The t24 to t28 in Fig. 5 (b) is a state in which the hot water in the storage tank 11 is broken, and the heating amount of the heat pump 51 is set to a fixed value (for example, Heating amount), PWM control is performed. As a result, the off period (t25 to t26, t27 to t28) is longer than that in the case where no hot water is disconnected, and the execution time of the boiling operation is lengthened. After the boiling water boiling in the holding tank 11 is completed, the heating amount of the heat pump 51 is returned to proportional control to perform the PWM control.

3, the tank control unit 152 terminates the boil-off operation when the detection temperature of the tank temperature sensor 14 reaches 40 DEG C or higher, but boil-off operation is performed by the boil-off operation (The boiling amount) of the hot water may be smaller than the detection level (to the lower portion of the storage tank 11) by the tank temperature sensor 14. [ It is possible to shorten the execution time of the boiling operation by shortening the boiling amount, shorten the time to switch to the " heating priority mode ", and quickly restart the heating operation using the heat pump 51 as the heat source .

In the present embodiment, the heat storage heat pump efficiency is compared with the heating heat pump efficiency in STEP 32 of FIG. 3 to switch between the "heat storage priority mode" and the "heating priority mode", but under different conditions Storage priority mode "and" heating priority mode "may be switched according to the temperature, the temperature, and the like.

In the present embodiment, the processing of executing the boiling operation in STEP11 to STEP13 is performed when the heating operation is stopped in STEP10 of Fig. 3. However, the effect of the present invention can be obtained even when this processing is not performed.

In the present embodiment, when the boiling condition is established in STEP7 of FIG. 2, the process proceeds to STEP8 in FIG. 3, and it is determined whether or not the heating capacity of the heat pump 51 is equal to or lower than the heating requirement capacity. However, when the boiling condition is established in STEP7 of FIG. 2, the process is branched to STEP30 of FIG. 3 without performing the determination of STEP8, and the heat storage heat pump efficiency is compared with the heating heat pump efficiency by the processes of STEP30 to STEP32, The heat storage priority mode may be set when the heat pump efficiency is high and the heating priority mode when the heat pump efficiency is high.

In the present embodiment, the floor heater 200 is described as an example of the heating terminal of the present invention. However, the present invention may be applied to the heating terminal of the present invention as the warm air heater 210.

10 - Low temperature unit 11 - Storage tank
40 - Heating circuit 41 - Tank circuit
42 - Heat pump Bypass 48 - Heating side mixing valve
50 - Heat pump unit 51 - Heat pump
52 - Heat pump circulation path 55 - Heat pump heat exchanger
70 - Hot water auxiliary heat source 75 - Heating auxiliary heat source
80 - Gas heat source unit 150 - Controller
151 - Heating controller 152 - Tank controller
153 - Priority mode switching section 200 - Floor radiator

Claims (4)

A storage tank in which a water supply pipe is connected to a lower portion thereof, a hot water supply pipe is connected to an upper portion thereof, and water supplied from the water supply pipe is stored;
A tank circulation path connecting the lower part and the upper part of the storage tank,
A tank circulation pump circulating water stored in a lower portion of the storage tank to the upper portion of the storage tank through the tank circulation path,
A heating circulation path to which the heating terminal is connected,
A heating circulation pump circulating a heating medium in the heating circulation path,
A heat pump having a heat pump circulation path for heating a heat pump heat medium circulating in the heat pump circulation path,
The heat pump circulation path, the tank circulation path, and the heating circulation path to perform heat exchange between the heat pump heating medium circulating in the heat pump circulation path and the hot water circulating in the tank circulation path, A heat pump heat exchanger for performing heat exchange between the heat pump heating medium circulating in the heating circulation path and the heating heat medium circulating in the heating circulation path,
The heating circulation pump and the heat pump are operated by the user when the heating start operation of the floor heating remote control and the heating execution condition that is the start time of the timer operation are established, A heating control unit for performing a heating operation for heating the heating medium to perform heating by the heating terminal;
When the boiling operation condition in which the storage tank is in the boiling water cut-off state is established, the tank circulation pump and the heat pump are operated so that the hot water from the storage tank circulating in the tank circulation path is cooled to a predetermined boiling temperature And a tank control unit for performing boiling operation for heating the heat pump to a predetermined temperature,
A storage priority mode in which the execution of the heating operation is prohibited and the execution of the boiling operation is permitted when the heating execution condition and the boiling execution condition are established together, and a heat storage priority mode in which the execution of the boiling operation is prohibited And a priority mode switching section that switches the heating priority mode for allowing the heat storage heat pump efficiency to be higher than the heating heat pump efficiency to be higher than the heat storage heat pump efficiency so as to perform the sole operation of the boiling operation or the heating operation Heat pump heat source system.
The method according to claim 1,
A tank return temperature sensor for detecting the temperature of the hot water flowing into the heat pump heat exchanger from the tank circulation path,
And a heating return temperature sensor for detecting the temperature of the heating heat medium flowing into the heat pump heat exchanger from the heating circulation path,
Wherein the priority mode switching unit switches the priority mode switching unit to the heat pump heat exchanger in such a manner that the heating mode switching unit switches the priority mode switching unit between the heat storage pump efficiency and the heat storage efficiency of the heat pump when heating the hot water of the temperature detected by the tank return temperature sensor flowing from the tank circulation path to the boiling temperature , The heating heat pump efficiency, which is the efficiency of the heat pump when heating the heating heat medium having the detection temperature detected by the heating return temperature sensor flowing from the heating circulation path to a predetermined heating hot water temperature, is obtained in the heat pump heat exchanger , The heat storage priority mode is set when the heat storage heat pump efficiency is higher than the heating heat pump efficiency and the heating priority mode is set when the heat storage heat pump efficiency is higher than the heat storage heat pump efficiency Heat pump system.
The method according to claim 1,
Wherein the heating control unit operates the heat pump at a predetermined capacity or higher to intermittently perform the heating operation when the heating execution condition and the boiling execution condition are established together,
Wherein the priority mode switching section sets the heating priority mode during the execution of the heating operation and sets the heat storage priority mode during the stop of the heating operation when the heating operation is intermittently performed by the heating control section Heat pump heat source system.
The method according to any one of claims 1 to 3,
Wherein the tank control unit sets the total amount of the hot water in the storage tank to be heated up to the boiling temperature by the execution of the boiling operation when the heating execution condition and the boiling execution condition are established together, And the boiling operation condition is set to be lower than that when the boiling execution condition is established.

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