JP2019027749A - Hot water heating system - Google Patents

Abstract

To provide a technology capable of enhancing a temperature of a heat medium for heating in a case where the heat medium for heating and a heat medium for hot water supply are heated simultaneously by a heat pump.SOLUTION: A hot water heating system can execute heating operation of heating a heat medium for hot water supply by a heat pump, heating operation of heating a heat medium for heating by the heat pump, and auxiliary heating operation of heating the heat medium for heating by an auxiliary heat source machine. When the heating operation of heating the heat medium for hot water supply and the heating operation of heating the heat medium for heating are simultaneously executed, and the auxiliary heating operation is executed, a controller executes process of increasing a flow rate of refrigerant circulating in the heat pump.SELECTED DRAWING: Figure 4

Description

  The technology disclosed in the present specification relates to a hot water supply and heating system.

  The hot water supply and heating system disclosed in Patent Document 1 includes a heat pump and an auxiliary heat source machine. The heat pump includes a compressor that pressurizes the refrigerant, a condenser that condenses the refrigerant by exchanging heat between the refrigerant and the heating medium, and heat exchange between the refrigerant and the heating medium. A pressure reducing mechanism for reducing the pressure and an evaporator for evaporating the refrigerant by exchanging heat between the refrigerant and the natural environment are provided. The auxiliary heat source machine heats the heating medium by burning fuel. The hot water supply / heating system includes a hot water supply device that supplies hot water using a hot water supply heat medium, a heating device that uses a heating heat medium to heat, and a control device that controls the operation of the heat pump. In this hot water supply and heating system, a hot water supply heating operation for heating a hot water supply heat medium by a heat pump, a heating heating operation for heating a heating heat medium by a heat pump, and an auxiliary heating operation for heating the heating heat medium by an auxiliary heat source device are executed. Is possible. In this hot water supply / heating system, the hot water supply heating operation and the heating / heating operation are simultaneously performed.

JP 2014-16103 A

  When the hot water supply heating operation and the heating heating operation are simultaneously performed in the hot water supply / heating system, the heat of the refrigerant in the heat pump is distributed to the heating heat medium and the hot water supply heat medium by heat exchange. Therefore, since the heat of the refrigerant is used simultaneously for heating the heating medium and the hot water supply medium, the heating may be insufficient. In particular, the temperature of the heating medium for heating may not be sufficiently increased. If the temperature of the heating medium is not sufficiently high, it is necessary to perform an auxiliary heating operation, and energy efficiency is reduced. However, when the temperature of the heating medium after being heated by the heat pump is increased, if the temperature of the heating medium after being heated by the heat pump is lowered, the hot water heating operation is affected. This specification provides a technology that can increase the temperature of a heating medium without reducing the temperature of the heating medium when the heating medium and the heating medium are simultaneously heated by a heat pump. To do.

  The hot water supply and heating system disclosed in this specification includes a compressor that pressurizes the refrigerant, heat exchange between the refrigerant and the hot water heating medium, and heat exchange between the refrigerant and the heating heat medium. A condenser for condensing, a decompression mechanism for decompressing the refrigerant, a heat pump having an evaporator for evaporating the refrigerant by exchanging heat between the refrigerant and the natural environment, and an auxiliary for heating the heating heat medium by fuel combustion A heat source device, a hot water supply device that supplies hot water using a hot water supply medium, a heating device that heats using a heating heat medium, and a control device that controls the operation of the heat pump are provided. In this hot water supply and heating system, hot water supply heating operation for heating the hot water supply heat medium by the heat pump, heating heating operation for heating the heating heat medium by the heat pump, and auxiliary heating for heating the heating heat medium by the auxiliary heat source device Operation can be performed. Further, when the hot water supply heating operation and the heating heating operation are performed at the same time and the auxiliary heating operation is performed, the control device executes an increasing process for increasing the flow rate of the refrigerant circulating in the heat pump. To do.

  In the hot water supply and heating system described above, heat exchange is performed between the refrigerant and the hot water supply heat medium in the condenser to heat the hot water supply heat medium. Further, in the condenser, heat exchange is performed between the refrigerant and the heating medium, and the heating medium is heated. In addition, the refrigerant is condensed by heat exchange in the condenser. A relatively high temperature refrigerant flows into the condenser, condenses in the condenser, and a relatively low temperature refrigerant flows out of the condenser. In this hot water supply and heating system, when the hot water supply heating operation for heating the hot water supply heating medium and the heating heating operation for heating the heating heat medium are performed at the same time and the auxiliary heating operation is performed, the control device causes the heat pump to operate. By executing the increasing process for increasing the flow rate of the circulating refrigerant, the supercooling region when the refrigerant is condensed in the condenser is shortened. As a result, the temperature of the refrigerant flowing out of the condenser becomes higher after the increase in the refrigerant flow rate than before the increase.

  In the condenser, the hot water heating medium and the heating medium are heated. The heating medium has a relatively high temperature even after the heat is radiated by the heating device, and the heating medium flowing into the condenser has a relatively high temperature. For this reason, the heating medium flowing into the condenser has a higher temperature than the temperature of the refrigerant flowing out of the condenser. Therefore, the heating medium flowing into the condenser dissipates heat by heat exchange with the low-temperature refrigerant, and the temperature temporarily decreases. Thereafter, the temperature of the heating medium increases due to heat exchange with a higher-temperature refrigerant. The heating medium whose temperature has risen flows out of the condenser.

  Comparing before and after the increase in the refrigerant flow rate, as described above, the temperature of the refrigerant flowing out of the condenser is higher after the increase in the refrigerant flow rate than before the increase. Therefore, the difference between the temperature of the heating heat medium flowing into the condenser and the temperature of the refrigerant flowing out of the condenser is reduced. As a result, when the temperature of the heating medium flowing into the condenser temporarily decreases, the decrease in the temperature of the heating medium is relatively small. Accordingly, after the refrigerant flow rate increases, the temperature of the heating heat medium flowing out of the condenser becomes higher than before the increase.

  On the other hand, since the hot water supply heat medium is cold water supplied from, for example, tap water, the temperature of the hot water supply heat medium flowing into the condenser is relatively low, and is lower than the temperature of the refrigerant flowing out of the condenser. . Therefore, the hot water supply heat medium flowing into the condenser does not cause a temporary temperature decrease due to heat dissipation to the refrigerant, and always rises in temperature by heat exchange with the high-temperature refrigerant. The hot water heating medium whose temperature has risen flows out of the condenser.

  Comparing before and after the increase of the refrigerant flow rate, as described above, unlike the case of the heating medium, the temperature of the hot water supply medium does not temporarily decrease in the condenser. Even when the temperature of the refrigerant flowing out increases, the temperature of the hot water supply heat medium flowing out of the condenser does not substantially change.

  As described above, according to the hot water supply and heating system, when the hot water supply heating operation and the heating heating operation are performed at the same time and the auxiliary heating operation is performed, the control device increases the flow rate of the refrigerant circulating in the heat pump. By executing the increasing process, the temperature of the heating medium can be increased without reducing the temperature of the hot water supply medium by the above-described mechanism. Thereby, it is possible to suppress the execution of the auxiliary heating operation and to increase the energy efficiency.

  In the hot water supply and heating system, after the increase process is executed, when the hot water supply heating operation and the heating heating operation are executed simultaneously, and the auxiliary heating operation is not executed, the control device You may perform the reduction process which reduces the flow volume of the refrigerant | coolant which circulates through a heat pump.

  Since the operation of the heat pump when the increase process is executed is not necessarily the optimum operation of the heat pump, it is preferable to return the heat pump to the normal operation if there is no fear of performing the auxiliary heating operation. According to said structure, when an auxiliary heating operation is not performed, a heat pump can be returned to normal operation | movement by performing a reduction process.

  The hot water supply and heating system disclosed in this specification includes a compressor that pressurizes the refrigerant, heat exchange between the refrigerant and the hot water heating medium, and heat exchange between the refrigerant and the heating heat medium. A condenser for condensing, a decompression mechanism for decompressing the refrigerant, a heat pump including an evaporator for evaporating the refrigerant by exchanging heat between the refrigerant and the natural environment, and a temperature of the heating medium heated by the heat pump Temperature detecting means for detecting heat, an auxiliary heat source device for heating a heating medium by combustion of fuel, a hot water supply device for supplying hot water using a hot water supply heat medium, and a heating device for heating using a heating heat medium And a control device for controlling the operation of the heat pump. In this hot water supply and heating system, hot water supply heating operation for heating the hot water supply heat medium by the heat pump, heating heating operation for heating the heating heat medium by the heat pump, and auxiliary heating for heating the heating heat medium by the auxiliary heat source device Operation can be performed. The temperature of the heating medium detected by the temperature detecting means is a predetermined first reference in a state where the hot water heating operation and the heating heating operation are performed simultaneously and the auxiliary heating operation is not performed. When the temperature is equal to or lower than the temperature, the control device executes an increasing process for increasing the flow rate of the refrigerant circulating in the heat pump.

  According to this configuration, when the auxiliary heating operation is not executed, the temperature of the heating heat medium can be increased without reducing the temperature of the hot water supply heat medium by the same mechanism as described above. Thereby, it is possible to suppress the execution of the auxiliary heating operation and to increase the energy efficiency.

  In the hot water supply and heating system, the temperature of the heating medium detected by the temperature detecting means is determined in a state where the hot water supply heating operation and the heating heating operation are performed simultaneously and the auxiliary heating operation is not performed. When the temperature is equal to or lower than the predetermined first reference temperature over a predetermined first reference time, the control device may execute the increase process.

  According to this configuration, there is a delay of the predetermined first reference time when the control device determines whether or not the temperature of the heating medium is equal to or lower than the predetermined first reference temperature. Even if the temperature of the heating medium suddenly changes, the increase process is not executed if the temperature changes within the grace period (first reference time). Therefore, even if the temperature of the heating heat medium suddenly changes, the flow rate of the refrigerant does not increase thereby, and the flow rate of the refrigerant can be appropriately managed. Thereby, the temperature of the heating medium can be appropriately managed.

  Further, in the hot water supply and heating system, the temperature detection unit is configured in a state where the hot water supply heating operation and the heating heating operation are simultaneously performed after the increase process is performed and the auxiliary heating operation is not performed. When the temperature of the heating medium detected by the above is equal to or higher than a predetermined second reference temperature, the control device may execute a reduction process for reducing the flow rate of the refrigerant circulating in the heat pump.

  According to this configuration, after the increase process is performed, the heat pump can be returned to the normal operation by executing the decrease process in which the control device decreases the flow rate of the refrigerant circulating in the heat pump.

  Further, in the hot water supply and heating system, the temperature detection unit is configured in a state where the hot water supply heating operation and the heating heating operation are simultaneously performed after the increase process is performed and the auxiliary heating operation is not performed. When the temperature of the heating medium detected by the above is equal to or higher than the predetermined second reference temperature over a predetermined second reference time, the control device may execute the reduction process.

  According to this configuration, there is a delay of the predetermined second reference time when the control device determines whether or not the temperature of the heating medium is equal to or higher than the predetermined second reference temperature. Even if the temperature of the heating medium suddenly changes, the reduction process is not executed if the temperature changes within the grace period (second reference time). Therefore, even if the temperature of the heating medium is suddenly changed, the flow rate of the refrigerant is not reduced thereby, and the flow rate of the refrigerant can be appropriately managed. Thereby, the temperature of the heating medium can be appropriately managed.

It is a figure which shows typically the structure of the hot water supply heating system 2 which concerns on an Example. It is a flowchart explaining the ignition / extinguishing process of the heating burner 82 according to the embodiment. It is a figure explaining the temperature of the water for heating detected by the thermistor 89 which concerns on an Example. It is a flowchart explaining the 1st increase / decrease process of the refrigerant | coolant flow rate in the heat pump 50 which concerns on an Example. It is a flowchart explaining the 2nd increase / decrease process of the refrigerant | coolant flow rate in the heat pump 50 which concerns on an Example. It is the Mollier diagram of the refrigerant | coolant in the heat pump 50 which concerns on an Example (it is a figure before increase of the flow volume of a refrigerant | coolant). It is the Mollier diagram of the refrigerant | coolant in the heat pump 50 which concerns on an Example (It is a figure after increase of the flow volume of a refrigerant | coolant.).

  Hereinafter, the hot water supply heating system 2 which concerns on an Example is demonstrated. As shown in FIG. 1, a hot water supply / heating system 2 according to the present embodiment includes a tank unit 4 (an example of a hot water supply device), a heat pump unit 6, a heat source unit 8, and a control device 100.

  The heat pump unit 6 includes a heat pump 50 and a hot water circulation pump 22. The heat pump 50 includes a refrigerant circulation path 52 for circulating a refrigerant (for example, an HFC refrigerant such as R410A and a CO2 refrigerant such as R744), an air heat exchanger 54 (an example of an evaporator), a fan 56, and a compressor 62. , A three-fluid heat exchanger 58 (an example of a condenser), an expansion valve 60 (an example of a pressure reducing mechanism), a refrigerant bypass path 64, and an on-off valve 66.

  The air heat exchanger 54 exchanges heat between outside air (an example of a natural environment) blown by the fan 56 and the refrigerant in the refrigerant circulation path 52. As will be described later, the air heat exchanger 54 is supplied with a refrigerant in a low-pressure and low-temperature liquid state after passing through the expansion valve 60. The air heat exchanger 54 heats the refrigerant by exchanging heat between the refrigerant and the outside air. The refrigerant is vaporized by being heated, and is in a gas state at a relatively high temperature and a low pressure.

  The refrigerant after passing through the air heat exchanger 54 is supplied to the compressor 62. That is, the compressor 62 is supplied with a refrigerant in a gaseous state at a relatively high temperature and low pressure. When the refrigerant is compressed by the compressor 62, the refrigerant becomes a high-temperature and high-pressure gas state. The compressor 62 sends the compressed high-temperature and high-pressure gaseous refrigerant to the three-fluid heat exchanger 58.

  The refrigerant circulation path 52 of the three-fluid heat exchanger 58 is supplied with the high-temperature and high-pressure gaseous refrigerant sent from the compressor 62. The three-fluid heat exchanger 58 can perform heat exchange between the refrigerant in the refrigerant circuit 52 and water in the tank water circuit 20 described later (hereinafter also referred to as hot water supply water). Further, the three-fluid heat exchanger 58 can perform heat exchange between the refrigerant in the refrigerant circulation path 52 and water in a second heating heating path 88 described later (hereinafter also referred to as heating water). As a result of heat exchange in the three-fluid heat exchanger 58, the refrigerant is deprived of heat and condensed. Thereby, a refrigerant | coolant will be in a high-pressure liquid state with a comparatively low temperature.

  The expansion valve 60 is supplied with a relatively low-temperature and high-pressure liquid refrigerant after passing through the three-fluid heat exchanger 58. The refrigerant is depressurized by passing through the expansion valve 60 and becomes a low-temperature and low-pressure liquid state. The refrigerant that has passed through the expansion valve 60 is sent to the air heat exchanger 54 as described above.

  The refrigerant bypass path 64 has one end connected to the upstream side of the expansion valve 60 and the other end connected to the downstream side of the expansion valve 60. An open / close valve 66 is provided in the refrigerant bypass passage 64.

  When the compressor 62 is operated in the heat pump 50 with the on-off valve 66 closed, the refrigerant in the refrigerant circulation path 52 is converted into the air heat exchanger 54, the compressor 62, the three-fluid heat exchanger 58, and the expansion valve 60. It circulates in the order. In this case, in the three-fluid heat exchanger 58, the hot water supply water in the tank water circulation path 20 and / or the heating water in the second heating heating path 88 is heated.

  The three-fluid heat exchanger 58 includes a refrigerant inlet 521, a refrigerant outlet 522, a hot water inlet 201, a hot water outlet 202, a heating water inlet 881, and a heating water outlet 882. . The refrigerant in the gaseous state flows into the three-fluid heat exchanger 58 from the inlet 521 of the refrigerant, and the liquid refrigerant flows out from the outlet 522 of the refrigerant. In addition, hot water supply water flows into the three-fluid heat exchanger 58 from the hot water supply water inlet 201, and hot water supply water flows out of the hot water supply water outlet 202. Further, the heating water flows into the three-fluid heat exchanger 58 from the heating water inlet 881 and the heating water flows out from the heating water outlet 882. The refrigerant inlet 521 side of the three-fluid heat exchanger 58 corresponds to the hot water outlet 202 side and the heating water outlet 882 side. The refrigerant outlet 522 side of the three-fluid heat exchanger 58 corresponds to the hot water supply water inlet 201 side and the heating water inlet 881 side. That is, in the three-fluid heat exchanger 58, the refrigerant and the hot water supply water flow as counterflows, and the refrigerant and the heating water flow as counterflows.

  The tank unit 4 includes a tank 10. The tank 10 stores hot water supplied by the heat pump 50. The hot water supply water in this embodiment is tap water. The tank 10 is a hermetically sealed type, and the outside is covered with a heat insulating material. Water for hot water supply is stored in the tank 10 until it is full. The thermistors 12, 14, 16 and 18 are attached to the tank 10 at substantially equal intervals in the height direction of the tank 10. Each thermistor 12, 14, 16, 18 measures the temperature of the hot water at the mounting position. The heat storage state of the tank 10 can be specified from the detected temperatures of the thermistors 12, 14, 16, and 18.

  The tank water circulation path 20 has an upstream end connected to the lower part of the tank 10, passes through the three-fluid heat exchanger 58 of the heat pump unit 6, and a downstream end connected to the upper part of the tank 10. A water circulation pump 22 for hot water supply of the heat pump unit 6 is interposed in the tank water circulation path 20. In the heat pump unit 6, when the heat pump 50 is operated to drive the hot water supply water circulation pump 22, the hot water supply water at the lower part of the tank 10 is sent to the three-fluid heat exchanger 58 and heated, and the heated hot water supply water is supplied to the tank 10. Return to the top of the. Inside the tank 10, a temperature stratification is formed in which a layer of hot water supply water is stacked on a layer of low temperature hot water supply water. A thermistor 21 is attached downstream of the three-fluid heat exchanger 58 in the tank water circulation path 20. The thermistor 21 detects the temperature of hot water supplied from the heat pump 50 to the tank 10.

  The upstream end of the tap water introduction path 24 is connected to a tap water supply source 32 outside the hot water supply / heating system 2. The downstream side of the tap water introduction path 24 is branched into a first introduction path 24a and a second introduction path 24b. The downstream end of the first introduction path 24 a is connected to the lower part of the tank 10. The downstream end of the second introduction path 24 b is connected in the middle of the first hot water supply path 36. A check valve 26 is interposed in the first introduction path 24a. A check valve 28 is interposed in the second introduction path 24b.

  An upstream end of the first hot water supply path 36 is connected to the upper part of the tank 10. As described above, the second introduction path 24 b of the tap water introduction path 24 is connected to the middle of the first hot water supply path 36. A mixing valve 30 is interposed at the connection between the first hot water supply path 36 and the second introduction path 24b. The mixing valve 30 adjusts the ratio of the flow rate of hot water for hot water flowing into the first hot water supply path 36 from the upper part of the tank 10 and the flow rate of cold tap water flowing into the first hot water supply path 36 from the second introduction path 24b. To do. The first hot water supply path 36 on the downstream side of the connection portion with the second introduction path 24 b passes through the hot water supply heating path 37 of the heat source unit 8 and is connected to the second hot water supply path 39. The first hot water supply path 36 and the second hot water supply path 39 are connected by a heat source unit bypass path 33. A bypass valve 34 is interposed in the heat source bypass path 33. A downstream end of the second hot water supply passage 39 is connected to a hot water tap 38.

  The heat source unit 8 includes a cistern 70, a heating burner 82 (an example of an auxiliary heat source unit), and a hot water supply burner 81. The cistern 70 is a container having an open top and stores heating water therein. The heating water in this embodiment is, for example, an antifreeze liquid. The upstream end of the heating forward path 72 is connected to the systern 70. A heating water circulation pump 74 is interposed in the heating forward path 72. When the heating water circulation pump 74 is driven, the heating water in the systern 70 flows into the heating forward path 72.

  The downstream end of the heating forward path 72 is branched into a first heating heating path 73 and a low temperature heating circulation path 75. A low temperature heater 78 is attached to the low temperature heating circuit 75. The low temperature heater 78 of the present embodiment is, for example, a floor heater. The low temperature heater 78 heats using the heat of the supplied heating water. A heating burner 82 is interposed in the first heating heating path 73. The heating burner 82 heats the heating water in the first heating heating path 73. The downstream end of the first heating heating path 73 branches into a high temperature heating circulation path 77 and a reheating circulation path 79. A high temperature heater 76 (an example of a heating device) is attached to the high temperature heating circuit 77. The high temperature heater 76 of the present embodiment is, for example, a bathroom heater / dryer. The high temperature heater 76 heats using the heat of the supplied heating water. The low temperature heating circuit 75 and the high temperature heating circuit 77 merge at their downstream ends and are connected to the upstream end of the first heating return path 84.

  The downstream end of the first heating return path 84 branches into a second heating heating path 88 and an HP bypass path 94 in the tank unit 4. A heating water adjustment valve 90 is provided at the downstream end of the first heating return path 84. The heating water regulating valve 90 changes the opening degree, thereby changing the flow rate of the heating water flowing from the first heating return path 84 to the second heating heating path 88 and the heating water flowing from the first heating return path 84 to the HP bypass path 94. The flow rate ratio can be changed. For example, a three-way valve is used as the heating water adjustment valve 90 of the present embodiment. The second heating heating path 88 passes through the three-fluid heat exchanger 58 of the heat pump unit 6 and is connected to the upstream end of the second heating return path 96. A thermistor 89 (an example of temperature detection means) is attached to the second heating heating path 88 downstream of the three-fluid heat exchanger 58. The thermistor 89 detects the temperature of the heating water that has passed through the three-fluid heat exchanger 58. The HP bypass 94 is connected to the upstream end of the second heating return path 96 without passing through the three-fluid heat exchanger 58 of the heat pump unit 6. The downstream end of the second heating return path 96 is connected to the cistern 70 of the heat source unit 8.

  A reheating heat valve 83 and a reheating heat exchanger 97 are interposed in the reheating circulation path 79. The reheating thermal valve 83 opens and closes the reheating circulation path 79. In the reheating heat exchanger 97, heat exchange is performed between the heating water flowing in the reheating circulation path 79 and the bathtub water flowing in the bathtub water circulation path 91. A downstream end of the reheating circulation path 79 is connected to the second heating return path 96.

  The upstream end of the bathtub water circulation path 91 is connected to the bottom of the bathtub 98. The downstream end of the bathtub water circulation path 91 is connected to the side of the bathtub 98. A bathtub water circulation pump 99 is interposed in the bathtub water circulation path 91. When the bathtub water circulation pump 99 is driven, the bathtub water sucked out from the bottom of the bathtub 98 passes through the reheating heat exchanger 97 and is returned to the side of the bathtub 98.

  A hot water supply burner 81 is interposed in the hot water supply heating path 37. From the downstream side of the hot water supply burner 81 of the hot water supply heating path 37, the bathtub pouring path 40 is branched. The bathtub pouring passage 40 is provided with a pouring solenoid valve 42 for opening and closing the bathtub pouring passage 40. The downstream end of the bathtub pouring channel 40 is connected to the bathtub water circulation pump 99.

  The control device 100 controls the operation of each component of the tank unit 4, the heat pump unit 6, and the heat source unit 8.

(Operation of hot water heating system)
Next, the operation of the hot water supply / heating system 2 of the present embodiment will be described. Below, the hot-water supply heating operation, the hot-water supply operation, and the heating-heating operation which the hot-water supply heating system 2 implements are demonstrated in order.

(Hot water heating operation)
In the hot water supply heating operation, the hot water supply water in the tank 10 is heated by the heat pump 50, and the hot water supply water that has reached a high temperature is returned to the tank 10. When executing the hot water supply heating operation, the control device 100 drives the compressor 62 and the fan 56 to operate the heat pump 50 and also drives the hot water supply water circulation pump 22. At this time, the heat pump 50 drives the compressor 62 with the on-off valve 66 closed.

  By driving the compressor 62, the refrigerant in the refrigerant circulation path 52 circulates in the order of the air heat exchanger 54, the compressor 62, the three-fluid heat exchanger 58, and the expansion valve 60. In this case, the refrigerant in the refrigerant circuit 52 passing through the three-fluid heat exchanger 58 is in a high-temperature and high-pressure gas state. Further, the hot water supply water circulating pump 20 drives the hot water supply water in the tank 10 to circulate in the tank water circulation path 20. That is, hot water supply water existing in the lower part of the tank 10 is introduced into the tank water circulation path 20 and heated by the heat of the refrigerant in the refrigerant circulation path 52 when the introduced hot water supply water passes through the three-fluid heat exchanger 58. Then, the heated hot water supply water is returned to the upper part of the tank 10. At this time, the operation of the heat pump 50 is controlled so that the temperature of the hot water supply water detected by the thermistor 21 becomes the boiling set temperature. Thereby, hot water for hot water supply is stored in the tank 10. When the inside of the tank 10 is in a fully stored state filled with high-temperature hot water supply water, the hot water supply heating operation is terminated.

(Hot water operation)
The hot water supply operation is an operation of supplying hot water in the tank 10 to the hot water tap 38. The hot water supply operation can be performed in parallel with the hot water supply heating operation. When the hot-water tap 38 is opened, tap water flows into the lower part of the tank 10 from the tap water introduction path 24 (first introduction path 24a) due to the water pressure from the tap water supply source 32. At the same time, the hot water supply water in the upper part of the tank 10 is supplied to the hot water tap 38 via the first hot water supply path 36.

  When the temperature of the hot water supplied from the tank 10 to the first hot water supply path 36 is higher than the set hot water temperature, the control device 100 drives the mixing valve 30 to connect the first hot water supply path 36 from the second introduction path 24b. Introduce tap water. Therefore, the hot water supply water supplied from the tank 10 and the tap water supplied from the second introduction path 24 b are mixed in the first hot water supply path 36. The control device 100 adjusts the opening of the mixing valve 30 so that the temperature of the hot water supplied to the hot water tap 38 coincides with the hot water set temperature. On the other hand, when the temperature of the hot water supplied from the tank 10 to the first hot water supply path 36 is lower than the set hot water temperature, the control device 100 heats the hot water supplied through the hot water heating path 37 by the hot water supply burner 81. To do. The control device 100 controls the output of the hot water supply burner 81 so that the temperature of the hot water supply water supplied to the hot water tap 38 matches the hot water supply set temperature.

(Heating / heating operation)
The heating and heating operation is an operation in which heating water is heated by the heat pump 50 and heated by the low-temperature heater 78 or the high-temperature heater 76 using the heating water having a high temperature. When the execution of the heating heating operation is instructed by the user, the control device 100 adjusts the opening degree of the heating water adjustment valve 90 according to the load of the low temperature heater 78 or the high temperature heater 76, and the heating water circulation pump 74. Rotate. Further, the control device 100 drives the compressor 62 and the fan 56 with the on-off valve 66 closed. As a result, the heating water heated by the three-fluid heat exchanger 58 is supplied to the low-temperature heater 78 and the high-temperature heater 76 via the cistern 70. Furthermore, the control apparatus 100 operates the heating burner 82 as necessary. As a result, the high-temperature heater 76 is supplied with heating water that has been heated to a higher temperature by the heating by the heating burner 82. In the heating operation, so that the temperature of the heating water supplied to the low temperature heater 78 becomes the low temperature heating set temperature, and the temperature of the heating water supplied to the high temperature heater 76 becomes the high temperature heating set temperature, The opening degree of the heating water adjustment valve 90, the operation of the heat pump 50, and the output of the heating burner 82 are adjusted.

(Simultaneous execution of hot water heating operation and heating heating operation)
In the hot water supply and heating system 2, when the hot water supply heating operation and the heating heating operation are performed simultaneously, the three-fluid heat exchanger 58 of the heat pump 50 simultaneously performs the heating of the hot water supply water and the heating water.

  In the hot water supply and heating system 2, when the hot water supply heating operation and the heating heating operation are performed simultaneously, the control device 100 performs an ignition / extinguishing process of the heating burner 82. In addition, the control device 100 performs an increase / decrease process of the refrigerant flow rate in the heat pump 50. These processes will be described below.

(Ignition / extinguishing treatment of heating burner 82)
The ignition / extinguishing process of the heating burner 82 will be described. As shown in FIG. 2, in step S101 of this process, the control device 100 monitors the temperature of the heating water detected by the thermistor 89, and the detected temperature of the heating water is a predetermined ignition reference temperature (see FIG. 3). ) Determine whether or not: The ignition reference temperature in step S101 is 36 ° C., for example. When the temperature of the heating water is equal to or lower than the ignition reference temperature (36 ° C.), the control device 100 determines YES in step S101 and proceeds to step S102. On the other hand, when the temperature of the heating water is not equal to or lower than the ignition reference temperature (36 ° C.), the control device 100 determines NO and continues to monitor the temperature.

  Subsequently, in step S102, the control device 100 ignites the heating burner 82 interposed in the first heating heating path 73. When the heating burner 82 is ignited, the heating water in the first heating heating path 73 is auxiliary-heated and the temperature of the heating water rises.

  As shown in FIG. 3, the temperature of the heating water detected by the thermistor 89 varies depending on the heating condition of the heating water. When the heating water is heated, the temperature increases, and when the heating water is not heated, the temperature decreases.

  As shown in FIG. 2, subsequently, in step S103, the control device 100 again monitors the temperature of the heating water detected by the thermistor 89, and the detected temperature of the heating water is a predetermined fire extinguishing reference temperature (see FIG. 3). ) Determine whether it is above. The fire extinguishing reference temperature in step S103 is 45 ° C., for example. When the temperature of the heating water is equal to or higher than the fire extinguishing reference temperature (45 ° C.), the control device 100 determines YES in step S103 and proceeds to step S104. On the other hand, when the temperature of the heating water is not equal to or higher than the fire extinguishing reference temperature (45 ° C.), the control device 100 determines NO and continues to monitor the temperature.

  Subsequently, in step S <b> 104, the control device 100 extinguishes the heating burner 82 interposed in the first heating heating path 73. When the heating burner 82 is extinguished, the heating water in the first heating heating path 73 is not supplementally heated. When the process of step S104 ends, the process returns to step S101 again.

(First increase / decrease processing of refrigerant flow rate)
The first increase / decrease process of the refrigerant flow rate in the heat pump 50 will be described. As shown in FIG. 4, in step S <b> 111 of this process, the control device 100 determines whether or not the heating burner 82 interposed in the first heating heating path 73 has been ignited. As described above, the heating burner 82 is ignited when the temperature of the heating water detected by the thermistor 89 falls below a predetermined ignition reference temperature (see steps S101 and S102 in FIG. 2). When the heating burner 82 is ignited, the control device 100 determines YES in step S111 and proceeds to step S112. On the other hand, when the heating burner 82 is not ignited, the control device 100 determines NO and waits.

  Subsequently, in step S112, the control device 100 increases the flow rate of the refrigerant flowing through the refrigerant circulation path 52. That is, the control device 100 executes an increasing process for increasing the flow rate of the refrigerant circulating in the heat pump 50. Specifically, the control device 100 increases the opening degree of the expansion valve 60 in the heat pump 50 and / or increases the rotational speed of the compressor 62. Thereby, the flow rate of the refrigerant in the heat pump 50 increases.

  Subsequently, in step S113, the control device 100 determines whether or not the heating burner 82 interposed in the first heating heating path 73 has been extinguished. As described above, the heating burner 82 extinguishes when the temperature of the heating water detected by the thermistor 89 becomes equal to or higher than a predetermined fire extinguishing reference temperature (see steps S103 and S104 in FIG. 2). When the heating burner 82 is extinguished, the control device 100 determines YES in step S113 and proceeds to step S114. On the other hand, when the heating burner 82 is not extinguished, the control device 100 determines NO and waits. In this case, the control device 100 maintains the flow rate of the refrigerant flowing through the refrigerant circulation path 52 while increasing it.

  Subsequently, in step S114, the control device 100 decreases the flow rate of the refrigerant flowing through the refrigerant circulation path 52 and returns it to the normal flow rate before the increase. That is, the control device 100 executes a reduction process for reducing the flow rate of the refrigerant circulating in the heat pump 50. Specifically, the control device 100 decreases the opening degree of the expansion valve 60 in the heat pump 50 and / or decreases the rotational speed of the compressor 62. Thereby, the flow rate of the refrigerant in the heat pump 50 decreases and returns to the normal flow rate before the increase. When the process of step S114 ends, the process returns to step S111 again.

  In the first increase / decrease process, the controller 100 causes the heat pump 50 to maintain the temperature of the heating water detected by the thermistor 89 as much as possible between the ignition reference temperature (36 ° C.) and the fire extinguishing reference temperature (45 ° C.). Increase or decrease the flow rate of the refrigerant.

(Second increase / decrease processing of refrigerant flow rate)
Next, the second increase / decrease process of the refrigerant flow rate in the heat pump 50 will be described. In this process, the heating burner 82 is always extinguished (not ignited). As shown in FIG. 5, in step S121 of this process, the control device 100 monitors the temperature of the heating water detected by the thermistor 89, and the detected temperature of the heating water is a predetermined first reference temperature (FIG. 3). Reference) Judge whether or not the following is true. The first reference temperature in step S121 is 37 ° C., for example. When the temperature of the water for heating is below 1st reference temperature (37 degreeC), the control apparatus 100 judges YES in step S121, and progresses to step S122. On the other hand, when the temperature of the heating water is not equal to or lower than the first reference temperature (37 ° C.), the control device 100 determines NO and continues to monitor the temperature.

  In step S121, control device 100 may determine whether the temperature of the heating water is equal to or lower than a predetermined first reference temperature over a predetermined first reference time. The first reference time in step S121 is, for example, 1 minute. When the temperature of the heating water is equal to or lower than the first reference temperature (37 ° C.) over the first reference time (1 minute), the control device 100 determines YES in step S121 and proceeds to step S122. Otherwise, the control device 100 determines NO and continues to monitor the temperature.

  Subsequently, in step S122, the control device 100 increases the flow rate of the refrigerant flowing through the refrigerant circulation path 52. That is, the control device 100 executes an increasing process for increasing the flow rate of the refrigerant circulating in the heat pump 50. Specifically, the control device 100 increases the opening degree of the expansion valve 60 in the heat pump 50 and / or increases the rotational speed of the compressor 62. Thereby, the flow rate of the refrigerant in the heat pump 50 increases.

  Subsequently, in step S123, the control device 100 monitors the temperature of the heating water detected by the thermistor 89, and whether or not the detected temperature of the heating water is equal to or higher than a predetermined second reference temperature (see FIG. 3). Judging. The second reference temperature in step S123 is 41 ° C., for example. When the temperature of the heating water is equal to or higher than the second reference temperature (41 ° C.), the control device 100 determines YES in step S123 and proceeds to step S124. On the other hand, when the temperature of the heating water is not equal to or higher than the second reference temperature (41 ° C.), the control device 100 determines NO and stands by. In this case, the control device 100 maintains the flow rate of the refrigerant flowing through the refrigerant circulation path 52 while increasing it.

  In step S123, control device 100 may determine whether the temperature of the heating water is equal to or higher than a predetermined second reference temperature over a predetermined second reference time. The second reference time in step S123 is, for example, 1 minute. When the temperature of the heating water is equal to or higher than the second reference temperature (41 ° C.) over the second reference time (1 minute), the control device 100 determines YES in step S123 and proceeds to step S124. Otherwise, the control device 100 determines NO and returns to step S122.

  Subsequently, in step S124, the control device 100 decreases the flow rate of the refrigerant flowing through the refrigerant circulation path 52 and returns it to the normal flow rate before the increase. That is, the control device 100 executes a reduction process for reducing the flow rate of the refrigerant circulating in the heat pump 50. Specifically, the control device 100 decreases the opening degree of the expansion valve 60 in the heat pump 50 and / or decreases the rotational speed of the compressor 62. Thereby, the flow rate of the refrigerant in the heat pump 50 decreases and returns to the normal flow rate before the increase. When the process of step S124 ends, the process returns to step S121 again.

  In the second increase / decrease process, the control device 100 is configured so that the temperature of the heating water detected by the thermistor 89 is maintained as much as possible between the first reference temperature (37 ° C.) and the second reference temperature (41 ° C.). The flow rate of the refrigerant in the heat pump 50 is increased or decreased.

  The hot water supply / heating system 2 according to the embodiment has been described above. As is apparent from the above description, the hot water supply / heating system 2 includes a heat pump 50 and a heating burner 82. The heat pump 50 includes a compressor 62 that pressurizes the refrigerant, a three-fluid heat exchanger 58 that condenses the refrigerant by exchanging heat between the refrigerant and the water for hot water, and exchanging heat between the refrigerant and the water for heating, An expansion valve 60 that decompresses the refrigerant and an air heat exchanger 54 that evaporates the refrigerant by exchanging heat between the refrigerant and the natural environment are provided. The heating burner 82 heats the heating water by the combustion of fuel. The hot-water supply / heating system 2 includes a tank unit 4 that supplies hot water using hot-water supply water, a high-temperature heater 76 that uses hot water for heating, and a control device 100 that controls the operation of the heat pump 50. In this hot water supply and heating system 2, a hot water supply heating operation in which hot water supply water is heated by the heat pump 50, a heating heating operation in which heating water is heated by the heat pump 50, and an auxiliary heating operation in which heating water is heated by the heating burner 82 can be executed. is there. When the hot water supply heating operation and the heating heating operation are performed at the same time and the auxiliary heating operation is performed, the control device 100 executes an increasing process for increasing the flow rate of the refrigerant circulating in the heat pump 50 (see step S112). ).

  According to this configuration, when the hot water and the heating water are simultaneously heated by the heat pump 50 and the heating water is heated by the heating burner 82, the temperature of the heating water is increased without decreasing the temperature of the hot water. Can do. This mechanism will be described later.

  In addition, the operation of the heat pump 50 when the increase process is executed is not necessarily the optimal operation of the heat pump 50. Therefore, if there is no fear that the auxiliary heating operation is executed, the heat pump 50 is returned to the normal operation. It is preferable. Therefore, in the hot water supply and heating system 2 described above, when the increase processing (see step S112) is executed, the hot water supply heating operation and the heating heating operation are executed at the same time, and the auxiliary heating operation is not executed. 100 executes a reduction process for reducing the flow rate of the refrigerant circulating through the heat pump 50 (see step S114). Thereby, the heat pump 50 can be returned to normal operation.

  In the hot water supply and heating system 2 described above, when the hot water supply heating operation and the heating heating operation are performed simultaneously, if the control device 100 increases the flow rate of the refrigerant circulating in the heat pump 50, the hot water supply flowing out from the three-fluid heat exchanger 58 The temperature of the heating water flowing out from the three-fluid heat exchanger 58 rises without changing the temperature of the water. This mechanism will be described with reference to the drawings.

  6 and 7 are Mollier diagrams of the refrigerant in the heat pump 50. FIG. 6 and 7, the vertical axis represents the refrigerant temperature (° C.), and the horizontal axis represents the refrigerant specific enthalpy (kJ / kg). In FIGS. 6 and 7, between A and B is a refrigerant pressurizing process, between B and C is a refrigerant condensing process, between C and D is a refrigerant depressurizing process, and between D and A. Is the refrigerant evaporation process. Moreover, among the condensation processes of the refrigerant | coolant between BC, especially between J-C has shown the supercooling area | region of the refrigerant | coolant. FIG. 6 is a diagram of a state before the flow rate of the refrigerant circulating through the heat pump 50 is increased. On the other hand, FIG. 7 is a diagram of the state after increasing the flow rate of the refrigerant circulating in the heat pump 50.

  6 and 7 indicate the state of the refrigerant at the refrigerant outlet 522 of the three-fluid heat exchanger 58 after the refrigerant condensation process is completed. Comparing points C in FIG. 6 and FIG. 7, the temperature of the refrigerant after the increase in the flow rate (FIG. 7) is higher than the temperature of the refrigerant before the increase in the flow rate (FIG. 6). Before the refrigerant flow rate increases, the refrigerant temperature (point C) at the refrigerant outlet 522 is 20 ° C. After the increase in the refrigerant flow rate, the refrigerant temperature (point C) at the refrigerant outlet 522 is 30 ° C. The refrigerant at this time is in a supercooled liquid state. As apparent from FIGS. 6 and 7, after the increase in the refrigerant flow rate, the refrigerant subcooling region (region between J and C) is shorter than before the increase, and the refrigerant of the three-fluid heat exchanger 58 is reduced. The temperature of the refrigerant at the outlet 522 increases. It should be noted that the temperature (point B) of the refrigerant at the refrigerant inlet 521 does not change at 80 ° C. either before or after the increase in the refrigerant flow rate. The refrigerant at this time is in the state of superheated steam. The condensation temperature (point J) of the refrigerant is 43 ° C.

  6 and 7 indicate the temperature of the heating water at the heating water inlet 881 of the three-fluid heat exchanger 58. 6 and 7, the temperature (point E) of the heating water at the heating water inlet 881 is 34 ° C. Since the heating water is warm water circulating for heating, the temperature of the heating water at the heating water inlet 881 (point E) is higher than the temperature of the hot water supply water at the hot water inlet 201 (point G). It is. Lines L1 in FIGS. 6 and 7 indicate the temperature of the heating water in the process in which the heating water passes through the three-fluid heat exchanger 58 (that is, the refrigerant condensation process). 6 and 7 indicate the temperature of the heating water at the heating water outlet 882 of the three-fluid heat exchanger 58. Heating water is heated by heat exchange with the refrigerant in the process of passing through the three-fluid heat exchanger 58. On the other hand, the refrigerant condenses.

  As shown in FIGS. 6 and 7, the temperature (point E) of the heating water at the heating water inlet 881 of the three-fluid heat exchanger 58 is higher than the temperature of the refrigerant (point C) at the refrigerant outlet 522. . As shown in FIG. 1, the heating water inlet 881 side of the three-fluid heat exchanger 58 corresponds to the refrigerant outlet 522 side. Therefore, on the heating water inlet 881 side (the refrigerant outlet 522 side) of the three-fluid heat exchanger 58, the heat of the high-temperature heating water moves to the low-temperature refrigerant. As a result, the temperature of the water for heating falls temporarily like the L1 line of FIG. 6 and FIG.

  Comparing the L1 lines in FIG. 6 and FIG. 7, after the refrigerant flow rate is increased (FIG. 7), the temperature drop of the heating water is relatively smaller than before the refrigerant flow rate is increased (FIG. 6). . As described above, after the refrigerant flow rate is increased (FIG. 7), the refrigerant subcooling region (region between JC) is shorter than before the refrigerant flow rate is increased (FIG. 6), and the three-fluid heat The refrigerant temperature (point C) at the refrigerant outlet 522 of the exchanger 58 increases. Therefore, as shown by the L1 line, after the refrigerant flow rate is increased (FIG. 7), the heat transfer from the heating water to the refrigerant is smaller than before the refrigerant flow rate is increased (FIG. 6). The temperature drop is relatively small.

  The heating water is heated by heat exchange with the refrigerant in the process of passing through the three-fluid heat exchanger 58. As a result, the temperature of the heating water rises. 6 and FIG. 7 are compared, after the refrigerant flow rate is increased (FIG. 7), the heating water outlet 882 of the three-fluid heat exchanger 58 is larger than before the refrigerant flow rate is increased (FIG. 6). Heating water temperature is high. As described above, after the refrigerant flow rate is increased (FIG. 7), the heating water inlet 881 side (refrigerant outlet 522 side) of the three-fluid heat exchanger 58 is larger than before the refrigerant flow rate is increased (FIG. 6). Since the temporary decrease in the temperature of the heating water at is relatively small, the temperature of the heating water at the heating water outlet 882 of the three-fluid heat exchanger 58 becomes relatively high accordingly. Before the increase in the flow rate of the refrigerant, the temperature (F point) of the heating water at the outlet 882 for heating water is 40 ° C. After the increase in the flow rate of the refrigerant, the temperature (F point) of the heating water at the outlet 882 for heating water is 45 ° C.

  Next, hot water supply water will be described. 6 and 7 indicate the temperature of the hot water supply water at the hot water supply water inlet 201 of the three-fluid heat exchanger 58. Since the hot water supply water is cold water supplied from the lower part of the tank 10, the temperature of hot water supply water (point G) at the hot water supply inlet 201 is lower than the temperature of the heating water (point E) at the heating water inlet 881. It is. Lines L2 in FIGS. 6 and 7 indicate the temperature of the hot water supply water in the process in which the hot water supply water passes through the three-fluid heat exchanger 58 (that is, the refrigerant condensation process). 6 and 7 indicate the temperature of the hot water at the hot water outlet 202 of the three-fluid heat exchanger 58. The hot water supply water is heated by heat exchange with the refrigerant in the process of passing through the three-fluid heat exchanger 58. Hot water supply water and heating water are simultaneously heated by the three-fluid heat exchanger 58. The temperature of hot water supply water (G point) at the hot water supply water inlet 201 is 9 ° C. The temperature (H point) of the hot water supply water at the hot water supply water outlet 202 is 47 ° C.

  As shown in FIGS. 6 and 7, the temperature (point G) of hot water at the hot water inlet 201 of the three-fluid heat exchanger 58 is lower than the temperature (point C) of the refrigerant at the refrigerant outlet 522. . Moreover, as shown in FIG. 1, the hot water supply water inlet 201 side of the three-fluid heat exchanger 58 corresponds to the refrigerant outlet 522 side. Therefore, at the hot water supply water inlet 201 side (refrigerant outlet 522 side) of the three-fluid heat exchanger 58, the heat of the high-temperature refrigerant moves to the low-temperature hot water supply water. As a result, unlike the L2 line in FIGS. 6 and 7, the temperature of the hot water supply water does not temporarily decrease unlike the temperature of the heating water.

  The hot water supply water is heated by heat exchange with the refrigerant in the process of passing through the three-fluid heat exchanger 58. As a result, the temperature of the hot water supply water rises. The temperature of the hot water supply water always rises without being temporarily lowered as indicated by the line L2 in FIGS. In the three-fluid heat exchanger 58, since the heat of hot water is not transferred to the refrigerant, the temperature of the hot water is increased without temporarily decreasing. On the hot water supply water outlet 202 side (the refrigerant inlet 521 side) of the three-fluid heat exchanger 58, the temperature of the hot water supply water (point H) is higher than the temperature of the heating water (point F). Moreover, the temperature (point H) of hot water supply water becomes substantially the same before the increase in the refrigerant flow rate (FIG. 6) and after the increase in the flow rate (FIG. 7). Since the three-fluid heat exchanger 58 does not deprive the heat of the hot water supply water, the temperature of the hot water supply water (point H) is approximately the same before the refrigerant flow rate increases (FIG. 6) and after the flow rate increase (FIG. 7). become.

  When the hot water supply heating operation and the heating heating operation are simultaneously performed by the mechanism as described above, the hot water supply water flowing out from the three-fluid heat exchanger 58 when the control device 100 increases the flow rate of the refrigerant circulating in the heat pump 50. The temperature of the heating water flowing out from the three-fluid heat exchanger 58 rises without changing the temperature of. Therefore, after increasing the flow rate of the refrigerant in the heat pump 50 (FIG. 7), the temperature of the heating water flowing out from the three-fluid heat exchanger 58 (without decreasing the temperature of hot water flowing out from the three-fluid heat exchanger 58 ( F point) can be raised to the fire extinguishing reference temperature (45 ° C.). As a result, the heating burner 82 can be extinguished, fuel combustion in the heating burner 82 can be suppressed, and energy efficiency can be increased.

  Further, in the hot water supply and heating system 2 described above, the temperature of the heating water detected by the thermistor 89 is the predetermined first in a state where the hot water supply heating operation and the heating heating operation are performed simultaneously and the auxiliary heating operation is not performed. When the temperature is equal to or lower than the reference temperature (for example, 37 ° C.), the control device 100 executes an increasing process for increasing the flow rate of the refrigerant circulating in the heat pump 50 (see steps S121 and S122).

  According to this configuration, when the control device 100 increases the flow rate of the refrigerant circulating through the heat pump 50 by the same mechanism as described above, the temperature of the hot water flowing out from the three-fluid heat exchanger 58 is not decreased. The temperature of the heating water flowing out from the fluid heat exchanger 58 can be increased. Therefore, after the refrigerant flow rate in the heat pump 50 is increased (FIG. 7), the temperature of the heating water (point F) can be maintained at the ignition reference temperature (36 ° C.) or higher, and the heating burner 82 is extinguished. The state can be maintained. As a result, the combustion of fuel in the heating burner 82 can be suppressed and the energy efficiency can be increased.

  Further, in the hot water supply and heating system 2 described above, the temperature of the heating water detected by the thermistor 89 is the predetermined first in a state where the hot water supply heating operation and the heating heating operation are performed simultaneously and the auxiliary heating operation is not performed. When the temperature is equal to or lower than a predetermined first reference temperature over a reference time (for example, 1 minute), the control device 100 may execute an increase process (see steps S121 and S122).

  According to this configuration, since the controller 100 determines whether or not the temperature of the heating water is equal to or lower than the predetermined first reference temperature, there is a delay of the first reference time. Even if it has changed, if it is within the grace period (first reference time), the process of increasing the flow rate of the refrigerant will not be executed. Therefore, even if a sudden temperature change occurs, the temperature of the water for heating can be managed appropriately.

  Further, in the hot water supply and heating system 2 described above, the thermistor 89 is executed in a state where the hot water supply heating operation and the heating heating operation are performed at the same time and the auxiliary heating operation is not performed after the increase process (see step S122). When the temperature of the heating water detected by the above is equal to or higher than a predetermined second reference temperature (for example, 41 ° C.), the control device 100 executes a reduction process for reducing the flow rate of the refrigerant circulating in the heat pump 50 (step S123). , S124). Thereby, the heat pump 50 can be returned to normal operation.

  Further, in the hot water supply and heating system 2 described above, the thermistor 89 is executed in a state where the hot water supply heating operation and the heating heating operation are performed at the same time and the auxiliary heating operation is not performed after the increase process (see step S122). When the temperature of the heating water detected by the above is equal to or higher than a predetermined second reference temperature over a predetermined second reference time (for example, 1 minute), the control device 100 executes a decrease process (see steps S123 and S124).

  According to this configuration, since the control device 100 determines whether or not the temperature of the heating water is equal to or higher than the predetermined second reference temperature, the second reference time is delayed, so the temperature of the heating water suddenly increases. Even if it has changed, if it is within the grace period (second reference time), the refrigerant flow rate reduction process is not executed. Therefore, even if a sudden temperature change occurs, the temperature of the water for heating can be managed appropriately.

  As mentioned above, although the specific example of the technique disclosed by this specification was demonstrated in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. Further, the technical elements described in the present specification or drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing.

2: Hot water supply / heating system 4: Tank unit 6: Heat pump unit 8: Heat source unit 10: Tank 20: Tank water circulation path 22: Hot water circulation pump 24: Tap water introduction path 24a: First introduction path 24b: Second introduction path 30: Mixing valve 32: Tap water supply source 33: Heat source unit bypass path 34: Bypass valve 36: First hot water supply path 37: Hot water supply heating path 38: Hot water tap 39: Second hot water supply path 50: Heat pump 52: Refrigerant circulation path 54 : Air heat exchanger 56: Fan 58: Three-fluid heat exchanger 60: Expansion valve 62: Compressor 64: Refrigerant bypass path 66: On-off valve 70: Systurn 72: Heating forward path 73: First heating heating path 74: Heating water Circulation pump 75: Low temperature heating circuit 76: High temperature heater 77: High temperature heating circuit 78: Low temperature heater 81: Hot water supply burner 82: Heating burner 8 4: First heating return path 88: Second heating heating path 89: Thermistor 90: Heating water regulating valve 91: Bath water circulation path 94: HP bypass path 96: Second heating return path 100: Control device

Claims (6)

A compressor that pressurizes the refrigerant, a condenser that condenses the refrigerant by exchanging heat between the refrigerant and the heating medium, and a vacuum that depressurizes the refrigerant. A heat pump having an evaporator for evaporating the refrigerant by exchanging heat between the mechanism and the refrigerant and the natural environment;
An auxiliary heat source machine that heats the heating medium by burning fuel,
A hot water supply device that supplies hot water using a hot water supply heat medium;
A heating device for heating using a heating medium;
A control device for controlling the operation of the heat pump;
A hot water supply heating operation for heating the hot water supply heat medium by the heat pump, a heating heating operation for heating the heating heat medium by the heat pump, and an auxiliary heating operation for heating the heating heat medium by the auxiliary heat source device can be executed. ,
When the hot water supply heating operation and the heating heating operation are performed at the same time and the auxiliary heating operation is performed, the control device executes an increasing process for increasing the flow rate of the refrigerant circulating in the heat pump. Hot water heating system.   After the increase process is executed, when the hot water supply heating operation and the heating heating operation are executed at the same time and the auxiliary heating operation is not executed, the control device causes the flow rate of the refrigerant circulating in the heat pump. The hot water supply and heating system according to claim 1, wherein a reduction process for decreasing the temperature is executed. A compressor that pressurizes the refrigerant, a condenser that condenses the refrigerant by exchanging heat between the refrigerant and the heating medium, and a vacuum that depressurizes the refrigerant. A heat pump having an evaporator for evaporating the refrigerant by exchanging heat between the mechanism and the refrigerant and the natural environment;
Temperature detecting means for detecting the temperature of the heating medium heated by the heat pump;
An auxiliary heat source machine that heats the heating medium by burning fuel,
A hot water supply device that supplies hot water using a hot water supply heat medium;
A heating device for heating using a heating medium;
A control device for controlling the operation of the heat pump;
A hot water supply heating operation for heating the hot water supply heat medium by the heat pump, a heating heating operation for heating the heating heat medium by the heat pump, and an auxiliary heating operation for heating the heating heat medium by the auxiliary heat source device can be executed. ,
The temperature of the heating medium detected by the temperature detecting means is equal to or lower than a predetermined first reference temperature in a state where the hot water heating operation and the heating heating operation are performed simultaneously and the auxiliary heating operation is not performed. In such a case, the control device executes an increasing process for increasing the flow rate of the refrigerant circulating in the heat pump.   The temperature of the heating medium detected by the temperature detecting means is over a predetermined first reference time in a state where the hot water heating operation and the heating heating operation are performed simultaneously and the auxiliary heating operation is not performed. The hot water supply and heating system according to claim 3, wherein the control device executes the increasing process when the temperature is equal to or lower than the predetermined first reference temperature.   After the increase process is executed, the hot water heating operation and the heating heating operation are performed simultaneously, and the heating heating medium detected by the temperature detection means is detected in a state where the auxiliary heating operation is not performed. 5. The hot water supply and heating system according to claim 3, wherein when the temperature is equal to or higher than a predetermined second reference temperature, the control device executes a reduction process for reducing the flow rate of the refrigerant circulating in the heat pump.   After the increase process is executed, the hot water heating operation and the heating heating operation are performed simultaneously, and the heating heating medium detected by the temperature detection means is detected in a state where the auxiliary heating operation is not performed. 6. The hot water supply and heating system according to claim 5, wherein when the temperature is equal to or higher than the predetermined second reference temperature over a predetermined second reference time, the control device executes the decrease process.

Images