JP2010065930A - Heating system and heating hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating system and a heating hot water supply system capable of improving COP at start of a heat pump system. <P>SOLUTION: The heating system 100 is provided with: the heat pump system 1; a hot water storage tank 2 for storing hot water heated by the heat pump system 1; a circulation circuit 4 for circulating the hot water stored in the hot water storage tank 2 between the hot water storage tank 2 and a heating terminal 8; a circulating pump 48 for changing a flow rate of the hot water to be supplied to the heating terminal 8; a going temperature control means 45 for controlling going temperature of hot water to be supplied to the heating terminal 8; a control means 74 for controlling at least one of the circulating pump 48 and the going temperature control means 45; and a determination means 73 for determining a heating load in the heating terminal 8. When the determination means 73 determines that the heating load is smaller than a predetermined value, the control means 74 controls at least one of the circulating pump 48 and the going temperature control means 45 so that return temperature of the hot water to be returned from the heating terminal 8 to the hot water storage tank 2 is lowered. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heating system, and more particularly to a heating system and a heating hot water supply system that supply a circulating fluid heated to a predetermined temperature to a heating terminal.

Conventionally, a heating system including a heat pump system, a hot water storage tank that stores the circulating fluid heated by the heat pump system, and a heating terminal that is supplied with the circulating fluid stored in the hot water storage tank has been developed (for example, a patent) Reference 1). In such a heating system, when the outside air temperature is equal to or lower than the set temperature (when the heating load of the heating terminal exceeds a predetermined value), the circulating fluid supplied from the lower part of the hot water storage tank is heated and heated by the heat pump system. The circulating fluid is supplied from the hot water storage tank to the heating terminal. On the other hand, when the outside air temperature becomes higher than the set temperature (when the heating load of the heating terminal becomes smaller than a predetermined value), the hot water supply to the heating terminal is stopped.
Japanese Patent Laid-Open No. 2007-3188

  However, in the heating system described above, when the heating load is smaller than a predetermined value and the supply of hot water to the heating terminal is stopped, the temperature of the circulating fluid stored in the lower part of the hot water storage tank cannot be sufficiently reduced. There is. For this reason, when the heating load of the heating terminal becomes a predetermined value or more, it is not possible to supply a sufficiently low-temperature circulating fluid from the lower part of the hot water storage tank to the heat pump system. As a result, there is a problem that COP at the time of starting the heat pump system cannot be improved.

  The objective of this invention is providing the heating system and heating hot-water supply system which can improve COP at the time of heat pump system starting.

  A heating system according to the first invention includes a heat pump system, a hot water storage tank that stores hot water heated by the heat pump system, a circulation circuit that circulates the hot water stored in the hot water storage tank between the hot water storage tank and the heating terminal, Circulating pump for changing the flow rate of hot water supplied to the heating terminal, forward temperature adjusting means for adjusting the going-out temperature of hot water supplied to the heating terminal, and control means for controlling at least one of the circulating pump and the going-out temperature adjusting means And a judging means for judging the heating load at the heating terminal, and the control means reduces the return temperature of the hot water returning from the heating terminal to the hot water storage tank when the judging means judges that the heating load is smaller than a predetermined value. Thus, at least one of the circulation pump and the going-out temperature adjusting means is controlled.

  In this heating system, when the heating load becomes smaller than a predetermined value and the supply of hot water to the heating terminal is stopped normally, the return temperature of the hot water returning from the heating load to the hot water storage tank is lowered, so that it is stored in the hot water storage tank. The hot water that is produced can be kept at a low temperature. For this reason, when the heating load becomes equal to or higher than the predetermined value and the hot water supply to the heating terminal is started, the low-temperature water can be sufficiently supplied from the hot water storage tank to the heat pump system. As a result, the COP of the heat pump system is improved as compared with the conventional heating system.

  A heating system according to a second aspect of the invention is the heating system according to the first aspect of the invention, wherein the control means determines the warm water returning from the heating terminal to the hot water storage tank when the judgment means judges that the heating load is smaller than the predetermined value. At least one of the circulation pump and the forward temperature adjusting means is controlled so that the return temperature is equal to or lower than the target return temperature.

  In this heating system, when the heating load becomes smaller than a predetermined value and the supply of hot water to the heating terminal is stopped normally, the return temperature of the warm water returning from the heating load to the hot water storage tank is lowered to the target return temperature or less. The hot water stored in the hot water storage tank can be kept at a low temperature.

  A heating system according to a third aspect of the present invention is the heating system according to the first or second aspect of the invention, further comprising a return temperature sensor for detecting a return temperature, and the control means determines that the heating load is smaller than a predetermined value by the determination means. If so, at least one of the circulation pump and the forward temperature adjusting means is controlled based on the output of the return temperature sensor.

  In this heating system, since a return temperature sensor capable of detecting a return temperature correlated with the hot water temperature in the hot water storage tank is provided, the hot water temperature in the hot water storage tank is easily lowered according to the output of the return temperature sensor. be able to.

  A heating system according to a fourth invention is the heating system according to any one of the first to third inventions, comprising a tank temperature sensor provided in the hot water storage tank, and the control means is based on the output of the tank temperature sensor. Control at least one of the circulation pump and the forward temperature adjusting means.

  In this heating system, since the tank temperature sensor capable of detecting the hot water temperature in the hot water storage tank is provided, the return temperature can be controlled to be lowered according to the output of the tank temperature sensor. For this reason, the hot water temperature in a hot water storage tank can be reduced reliably.

  A heating system according to a fifth aspect of the present invention is the heating system according to the fourth aspect of the present invention, wherein the control means is a circulation pump and a forward temperature adjusting means so that the hot water temperature detected by the tank temperature sensor is equal to or lower than the target tank temperature. Control at least one of

  In this heating system, the hot water temperature in the hot water storage tank can be lowered below the target tank temperature.

  A heating system according to a sixth aspect of the present invention is the heating system according to the fifth aspect of the present invention, wherein the tank temperature sensor is provided below the hot water storage tank.

  In this heating system, since the tank temperature sensor capable of detecting the hot water temperature in the hot water storage tank is provided in the lower part of the hot water storage tank, the hot water temperature in the lower part of the hot water storage tank can be reliably lowered.

  A heating system according to a seventh aspect of the present invention is a heat pump system, a hot water storage tank that stores hot water heated by the heat pump system, and a first circulation circuit that circulates the hot water stored in the hot water storage tank between the hot water storage tank and the heating terminal. And a circulation pump that changes the flow rate of the hot water supplied to the heating terminal, and a second pump that supplies the hot water flowing out from the heating terminal to the circulation pump and circulates between the circulation pump and the heating terminal without passing through the hot water storage tank. Any one of a circulation circuit, an outgoing temperature adjusting means for adjusting the outgoing temperature of hot water supplied to the heating terminal, a first state in which hot water circulates in the first circulation circuit, and a second state in which hot water circulates in the second circulation circuit Switching means, control means for controlling at least one of the circulation pump, the forward temperature adjusting means and the switching means, and judgment means for judging the heating load at the heating terminal And the control means includes a circulation pump, a forward temperature adjusting means and a switching means so that the return temperature of the warm water returning from the heating terminal to the hot water storage tank is lowered when the determination means determines that the heating load is smaller than the predetermined value. Control at least one.

  In this heating system, there is provided switching means capable of switching between a first state in which the hot water circulates through the first circulation circuit that passes through the hot water storage tank and a second state in which the hot water circulates through the second circulation circuit that does not pass through the hot water storage tank. Therefore, when the heating load becomes smaller than the predetermined value and the hot water supply to the heating terminal is stopped, the hot water temperature can be reliably lowered by setting the second state. For this reason, when the heating load becomes equal to or higher than the predetermined value, the hot water supply to the heating terminal is started, and the low temperature water can be supplied to the hot water storage tank when switching from the second state to the first state. As a result, the low-temperature water can be sufficiently supplied from the hot water storage tank to the heat pump system, and the COP of the heat pump system is improved as compared with the conventional heating system.

  In the heating system according to the eighth aspect of the invention, in the heating system according to the seventh aspect of the invention, when the control means determines that the heating load is smaller than the predetermined value, the control means returns hot water from the heating terminal to the hot water storage tank. At least one of the circulation pump, the forward temperature adjusting means, and the switching means is controlled so that the return temperature is equal to or lower than the target return temperature.

  In this heating system, when the heating load becomes smaller than a predetermined value and the supply of hot water to the heating terminal is stopped normally, the return temperature of the warm water returning from the heating load to the hot water storage tank is lowered to the target return temperature or less. The hot water stored in the hot water storage tank can be kept at a low temperature.

  A heating system according to a ninth aspect is the heating system according to the seventh or eighth aspect, further comprising a return temperature sensor for detecting a return temperature, and the control means determines that the heating load is smaller than a predetermined value by the determination means. In this case, based on the output of the return temperature sensor, the circulation pump, the forward temperature adjusting means and the switching means are controlled.

  In this heating system, since a return temperature sensor capable of detecting a return temperature correlated with the hot water temperature in the hot water storage tank is provided, the hot water temperature in the hot water storage tank is easily lowered according to the output of the return temperature sensor. be able to.

  A heating system according to a tenth invention is the heating system according to any of the seventh to ninth inventions, comprising a tank temperature sensor provided in the hot water storage tank, and the control means is based on the output of the tank temperature sensor. The circulating pump, the outgoing temperature adjusting means and the switching means are controlled.

  In this heating system, since the tank temperature sensor capable of detecting the hot water temperature in the hot water storage tank is provided, the return temperature can be controlled to be lowered according to the output of the tank temperature sensor. For this reason, the hot water temperature in a hot water storage tank can be reduced reliably.

  A heating system according to an eleventh aspect of the invention is the heating system according to the tenth aspect of the invention, wherein the control means is a circulation pump and an outgoing temperature adjusting means so that the hot water temperature detected by the tank temperature sensor is equal to or lower than the target tank temperature. Control at least one of

  In this heating system, the hot water temperature in the hot water storage tank can be lowered below the target tank temperature.

  A heating system according to a twelfth aspect of the invention is the heating system according to the eleventh aspect of the invention, wherein the tank temperature sensor is provided below the hot water storage tank.

  In this heating system, since the tank temperature sensor capable of detecting the hot water temperature in the hot water storage tank is provided in the lower part of the hot water storage tank, the hot water temperature in the lower part of the hot water storage tank can be reliably lowered.

  A heating system according to a thirteenth invention includes an ambient temperature sensor that detects an ambient temperature of the heating terminal in the heating system according to any one of the first to twelfth inventions, and a setting unit that sets a set temperature of the heating terminal. The determining means determines that the heating load is smaller than a predetermined value when the ambient temperature is higher than the set temperature.

  In this heating system, since the ambient temperature sensor and the setting means are provided, it is possible to easily determine that the heating load has become smaller than a predetermined value by a simple calculation comparing the ambient temperature of the heating terminal and the set temperature.

A heating system according to a fourteenth invention is the heating system according to any one of the first to thirteenth inventions, wherein the refrigerant is a CO ₂ refrigerant.

In this heating system, as a characteristic of the CO ₂ refrigerant, COP at the time of heating is improved when the temperature of water to be heated is low. Since the temperature of the heated water is controlled to be low after using the CO ₂ refrigerant, the heat pump system can be operated with a high COP.

  A heating / hot water system according to a fifteenth aspect includes the heating system according to any one of the first to fourteenth aspects, and a heat exchanger that is disposed in the hot water storage tank and in which hot water flows inside.

  In this heating and hot water supply system, when the heating load becomes a predetermined value or more and hot water supply to the heating terminal is started, low temperature water can be supplied from the hot water storage tank to the heat pump system. As a result, the COP of the heat pump system is improved.

  As described above, according to the present invention, the following effects can be obtained.

  In the first invention, when the heating load becomes smaller than a predetermined value and the supply of hot water to the heating terminal is stopped, the return temperature of the warm water returning from the heating load to the hot water storage tank is lowered, thereby reducing the hot water storage tank. The stored hot water can be kept at a low temperature. For this reason, when the heating load becomes equal to or higher than the predetermined value and the hot water supply to the heating terminal is started, the low-temperature water can be sufficiently supplied from the hot water storage tank to the heat pump system. As a result, the COP of the heat pump system is improved as compared with the conventional heating system.

  In the second invention, when the heating load is smaller than a predetermined value and the supply of hot water to the heating terminal is stopped, the return temperature of the warm water returning from the heating load to the hot water storage tank is lowered below the target return temperature. By doing so, the hot water stored in the hot water storage tank can be kept at a low temperature.

  In the third aspect of the invention, since the return temperature sensor capable of detecting the return temperature correlated with the hot water temperature in the hot water storage tank is provided, the hot water temperature in the hot water storage tank can be easily adjusted according to the output of the return temperature sensor. Can be lowered.

  In the fourth invention, since the tank temperature sensor capable of detecting the temperature of the hot water in the hot water storage tank is provided, the return temperature can be controlled to be lowered according to the output of the tank temperature sensor. For this reason, the hot water temperature in a hot water storage tank can be reduced reliably.

  Moreover, in 5th invention, the hot water temperature in a hot water storage tank can be reduced below to a target tank temperature.

  In the sixth aspect of the invention, since the tank temperature sensor capable of detecting the hot water temperature in the hot water storage tank is provided in the lower part of the hot water storage tank, the hot water temperature in the lower part of the hot water storage tank can be reliably lowered.

  Further, in the seventh invention, switching means capable of switching between a first state in which the hot water circulates through the first circulation circuit passing through the hot water storage tank and a second state in which the hot water circulates through the second circulation circuit not through the hot water storage tank. Therefore, when the heating load is smaller than a predetermined value and the hot water supply to the heating terminal is stopped, the hot water temperature can be surely lowered by setting the second state. For this reason, when the heating load becomes equal to or higher than the predetermined value, the hot water supply to the heating terminal is started, and the low temperature water can be supplied to the hot water storage tank when switching from the second state to the first state. As a result, the low-temperature water can be sufficiently supplied from the hot water storage tank to the heat pump system, and the COP of the heat pump system is improved as compared with the conventional heating system.

  In the eighth invention, when the heating load is smaller than a predetermined value and the supply of hot water to the heating terminal is stopped, the return temperature of the warm water returning from the heating load to the hot water storage tank is lowered below the target return temperature. By doing so, the hot water stored in the hot water storage tank can be kept at a low temperature.

  In the ninth aspect of the invention, since the return temperature sensor capable of detecting the return temperature correlated with the hot water temperature in the hot water storage tank is provided, the hot water temperature in the hot water storage tank can be easily adjusted according to the output of the return temperature sensor. Can be lowered.

  In the tenth aspect of the invention, since the tank temperature sensor capable of detecting the hot water temperature in the hot water storage tank is provided, the return temperature can be controlled to be lowered according to the output of the tank temperature sensor. For this reason, the hot water temperature in a hot water storage tank can be reduced reliably.

  In the eleventh aspect, the hot water temperature in the hot water storage tank can be lowered to a target tank temperature or lower.

  In the twelfth aspect, since the tank temperature sensor capable of detecting the hot water temperature in the hot water storage tank is provided in the lower part of the hot water storage tank, the hot water temperature in the lower part of the hot water storage tank can be reliably lowered.

  In the thirteenth aspect, since the ambient temperature sensor and the setting means are provided, it is easy to compare that the heating load is smaller than the predetermined value by a simple calculation comparing the ambient temperature of the heating terminal and the set temperature. I can judge.

In the fourteenth invention, as a characteristic of the CO ₂ refrigerant, when the temperature of the water to be heated is low, the COP upon heating is improved. Since the temperature of the heated water is controlled to be low after using the CO ₂ refrigerant, the heat pump system can be operated with a high COP.

  In the fifteenth aspect, when the heating load becomes equal to or higher than the predetermined value and the hot water supply to the heating terminal is started, the low temperature water can be supplied from the hot water storage tank to the heat pump system. As a result, the COP of the heat pump system is improved.

  Hereinafter, the heating hot-water supply system of this invention is demonstrated in detail by embodiment of illustration.

  Drawing 1 is a mimetic diagram showing the composition of the heating hot-water supply system of a 1st embodiment of the present invention.

  The heating and hot water supply system 100 includes a heating system 101, a hot water supply system 102, and a remote controller 104 (setting means). The heating system 101 includes a heat pump unit 1 (heat pump system), a hot water storage tank 2, a heating circulation circuit 4 (circulation circuit), and a heating terminal 8. The hot water supply system 102 has a hot water supply heat exchanger 3. The heating and hot water supply system 100 is controlled by a control unit 60 disposed on the side surface of the hot water storage tank 2. The remote controller 104 is communicably connected to the control unit 60 in a wired or wireless manner in order to set the set temperature of the heating terminal 8. The remote controller 104 outputs a signal indicating the set temperature that has been set to the control unit 60. The hot water supply heat exchanger 3 is an example of a heat exchanger, and the heating circulation circuit 4 is an example of a circulation circuit.

The heat pump unit 1 includes a boiling circulation circuit 5, a refrigerant circuit 16, an electric blower 17, and an outside air temperature sensor 18, and water in the hot water storage tank 2 is heated to warm water. The refrigerant circuit 16 includes an evaporator 11, a compressor 12, a condenser (water refrigerant heat exchanger) 13, a supercooling heat exchanger 14, and an expansion valve 15. In the refrigerant circuit 16, CO ₂ refrigerant circulates.

In the evaporator 11, the CO ₂ refrigerant absorbs heat in the air sent from the electric blower 17 and gasifies it. Then, the CO ₂ refrigerant is compressed by the compressor 12 and becomes high temperature, and then reaches the condenser 13 and releases heat. Accordingly, CO ₂ refrigerant is a low temperature as compared to prior to entering the condenser 13 and flows toward the subcooling heat exchanger 14. The CO ₂ refrigerant is further cooled by the supercooling heat exchanger 14 and then returns to the evaporator 11 via the expansion valve 15.

  The heat pump unit 1 is connected to a hot water storage tank 2 via a boiling circulation circuit 5. The boiling circulation circuit 5 includes a boiling circulation pump 51 and a boiling three-way valve 52. The boiling circulation circuit 5 is connected to the second heating forward connection port 42, the heating supply port 53, and the antifreezing water return connection port 54. In addition, the 2nd heating outgoing connection port 42 is an example of a 1st water intake port.

The supply port 53 is provided in the lower part of the hot water storage tank 2. Thereby, the relatively low temperature hot water in the lower region in the hot water storage tank 2 can be supplied to the boiling circulation pump 51 through the supply port 53. The boiling circulation pump 51 sucks the relatively low-temperature hot water in the lower region in the hot water storage tank 2 and discharges the sucked relatively low-temperature hot water toward the condenser 13. In the condenser 13, the CO ₂ refrigerant and hot water are subjected to heat exchange, and the hot water becomes high temperature. The hot hot water exiting the condenser 13 goes to the boiling three-way valve 52.

  The boiling three-way valve 52 flows hot hot water from the condenser 13 to the upper region in the hot water storage tank 2 via the second heating forward connection port 42 during hot water supply operation and heating operation. Therefore, the second heating / outgoing connection port 42 is a heating return connection port through which hot water flows out from the supply port 53 of the hot water storage tank 2 and exits the condenser 13 of the heat pump unit 1.

  The hot water in the hot water storage tank 2 is formed with a hot water layer (temperature distribution) so that the hot water at the upper side is located at the upper side and the hot water at the lower side is located at the lower side. In addition, when the heat water which comes out of the condenser 13 of the heat pump unit 1 is not yet high enough at the time of starting the heat pump unit 1, the hot water is not the second heating forward connection port 42, and the antifreeze water return. The three-way valve 52 is controlled so as to be returned to the hot water storage tank 2 through the connection port 54.

  Therefore, the freeze prevention water return connection port 54 is a second boiling return connection port when the hot water is not sufficiently hot. Thus, switching the return port according to the temperature of the hot water may prevent the temperature distribution in the hot water tank 2 from being disturbed if hot water that is not sufficiently hot is returned to the upper part of the hot water tank 2. Because.

  This switching of the three-way valve is performed based on the output of a temperature sensor (not shown) provided between the condenser 13 and the boiling three-way valve 52. Further, during the freeze prevention operation, the boiling three-way valve 52 allows hot water flowing from the supply port 53 through the boiling circulation circuit 5 to pass through the freeze prevention water return connection port 54 in the hot water storage tank 2. Shed in the lower area of the. The freeze prevention operation is performed while the boiling operation is stopped.

  The hot water storage tank 2 stores hot water heated by the heat pump unit 1. In addition, a heater 6 is disposed at a substantially central portion in the vertical direction in the hot water storage tank 2, and the heater 6 directly heats the hot water in the hot water storage tank 2. In addition, a tank thermistor 61 (tank temperature sensor) for detecting the temperature of the hot water in the hot water storage tank 2 is provided below the hot water storage tank 2. The tank thermistor 61 outputs a signal indicating the detected hot water temperature to the control unit 60. Thus, in the present invention, since the tank thermistor 61 capable of detecting the hot water temperature in the hot water storage tank 2 is provided, the return temperature lowering control can be realized according to the output of the tank thermistor 61.

  The hot water supply heat exchanger 3 (heat exchanger) is formed of a coiled pipe and is arranged from the lower region to the upper region in the hot water storage tank 2. The hot water is heated by flowing through the hot water heat exchanger 3. More specifically, the hot water enters the hot water storage tank 2 from the lower part of the hot water storage tank 2 and flows upward through the hot water supply heat exchanger 3 arranged in the lower region of the hot water storage tank 2. The hot water flows through the hot water heat exchanger 3 disposed in the upper region of the hot water tank 2 upward, and then flows out of the hot water tank 2 from the upper part of the hot water tank 2. In addition, a heater 6 is disposed at the center of the hot water storage tank 2 in the vertical direction, and the hot water heat exchanger 3 is disposed so as to straddle the heater 6. With this heater 6, hot hot water can be stored in the upper part of the hot water storage tank 2.

  Further, in order to adjust the temperature of the hot water supply to the set temperature, the hot water mixing valve 31 is opened, and the hot water supplied from the hot water storage tank 2 and the hot water before flowing into the hot water storage tank 2 are mixed. Thereby, the temperature of the hot water supplied from the hot water storage tank 2 can be lowered.

  The heating circulation circuit 4 is for circulating the hot water stored in the hot water storage tank 2 through the plurality of heating terminals 8 outside the hot water storage tank 2 and then returning it to the hot water storage tank 2 again. The heating circulation circuit 4 is connected to the first heating forward connection port 41, the second heating forward connection port 42, and the heating return connection port 43. In addition, the 1st heating outgoing connection port 41 is an example of a 2nd water intake, and the heating return connection port 43 is an example of a return port.

  The first heating / outgoing connection port 41 is for taking out hot water in the hot water storage tank 2. The first heating / outgoing connection port 41 is provided at a substantially central portion in the vertical direction of the hot water storage tank 2, and is positioned near and above the heater 6. Thereby, the hot water immediately after being heated by the heater 6 can be taken out from the first heating forward connection port 41 and sent to the plurality of heating terminals 8.

  Similarly to the first heating forward connection port 41, the second heating forward connection port 42 is also for taking out hot water in the hot water storage tank 2. The second heating / outgoing connection port 42 is provided in the upper part of the hot water storage tank 2. Thereby, the hot water of the upper area | region in the hot water storage tank 2 can be taken out from the 2nd heating outgoing connection port 42, and can be sent to the some heating terminal 8. FIG. Moreover, the 2nd heating outgoing connection port 42 serves as a heating return connection port.

  The heating terminal 8 directly takes out the heat of hot water flowing from the hot water storage tank 2 and releases it into the room. Then, the hot water becomes low temperature, flows out of the heating terminal 8, and flows toward the heating return connection port 43. The heating return connection port 43 is provided in the lower part of the hot water storage tank 2. Thereby, the hot water which came out from the heating return connection port 43 can be mixed with the hot water of the comparatively low temperature of the lower area | region in the hot water storage tank 2. FIG. In addition, a room temperature thermistor 62 (ambient temperature sensor) that detects the indoor temperature is provided around the heating terminal 8. The room temperature thermistor 62 outputs a signal indicating the detected room temperature to the control unit 60.

  The heating circuit 4 includes a bypass pipe 44, a heating mixing valve 45 (forward temperature adjusting means), a forward temperature sensor 46, a return temperature sensor 47, a heating circulation pump 48 (circulation pump), and a heating three-way valve. 49 and a switching valve 63 (switching means) are provided. The bypass pipe 44 guides part of the hot water flowing from the heating terminal 8 to the heating return connection port 43 to the heating mixing valve 45.

  The heating mixing valve 45 has an inlet through which hot water from the hot water storage tank 2 flows and an inlet through which hot water from the bypass pipe 44 flows. The opening degree of each inlet of the heating mixing valve 45 is adjusted by the control unit 60.

  The going-out temperature sensor 46 detects the temperature of hot water from the hot water storage tank 2 toward the heating terminal 8 as the going-out temperature, and sends a signal indicating the going-out temperature to the control unit 60. The return temperature sensor 47 detects the temperature of warm water from the heating terminal 8 toward the hot water storage tank 2 as a return temperature, and sends a signal indicating the return temperature to the control unit 60. The heating circulation pump 48 sucks the hot water in the hot water storage tank 2 through the second heating outgoing connection port 42 or the first heating outgoing connection port 41 and discharges it toward the plurality of heating terminals 8.

  The three-way valve for heating 49 takes out hot water from the first heating forward connection port 41 when the high temperature region of the hot water in the hot water storage tank 2 exists in the vicinity of the first heating forward connection port 41. The heating three-way valve 49 takes out hot water from the second heating forward connection port 42 when the high temperature region of the hot water in the hot water storage tank 2 does not exist in the vicinity of the first heating forward connection port 41.

  FIG. 2 is a block diagram illustrating a configuration of the control unit 60. The control unit 60 includes a forward / return temperature detection unit 70, a tank temperature detection unit 71, a room temperature detection unit 72, a heating load determination unit 73 (determination unit), and a forward / return temperature control unit 74 (control unit). .

  The forward / return temperature detection unit 70 receives signals indicating the forward temperature and the return temperature from the forward temperature sensor 46 and the return temperature sensor 47, respectively, and outputs the received signals to the forward / return temperature control unit 74. As described above, since the forward temperature sensor 46 and the return temperature sensor 47 are provided, the heating mixing valve 45 and the heating circulation pump 48 can be controlled in accordance with the outputs of the forward temperature sensor 46 and the return temperature sensor 47.

  The tank temperature detection unit 71 receives a signal indicating the temperature of the hot water in the lower part of the hot water storage tank 2 from the tank thermistor 61, and outputs the received signal to the forward / return temperature control unit 74. The room temperature detection unit 72 receives a signal indicating the ambient temperature of the heating terminal 8 from the room temperature thermistor 62 and outputs the received signal to the heating load determination unit 73.

  The heating load determination unit 73 compares the signal indicating the room temperature received from the room temperature detection unit 72 with the signal indicating the set temperature of the heating terminal 8 received from the remote controller 104, and forwards / returns a signal indicating the comparison result. Output to the temperature controller 74. The forward / return temperature control unit 74 controls the heating mixing valve 45, the heating circulation pump 48, and the switching valve 63 based on the signal received from the heating load determination unit 73.

  FIG. 3 is experimental data showing the relationship between the circulation flow rate and the return temperature corresponding to each forward temperature. In the figure, the horizontal axis indicates the circulation flow rate (L / min) of the heating circulation pump 48, and the vertical axis indicates the return temperature (° C.). In addition, this experimental data has shown the case where the heating load of the heating terminal 8 is 500W. In this example, the circulation flow rate of 0.20 is the minimum flow rate.

  As shown in the figure, the return temperature tends to decrease as the going-out temperature decreases and decreases as the circulating flow rate decreases. For this reason, for example, if the forward temperature is kept at 45 ° C. and the circulation flow rate is kept at 0.5 or less, the return temperature can be kept at the target return temperature (30 ° C.) or less while suppressing the increase in the room temperature.

  FIG. 4 is a flowchart showing control operations of the heating mixing valve 45 and the heating circulation pump 48 of the heating hot water supply system according to the first embodiment of the present invention. In this control operation, when it is determined that the heating load of the heating terminal 8 is equal to or higher than a predetermined value, the forward temperature is maintained at 45 ° C., and the circulation flow rate is maintained at the minimum flow rate (FIG. 3). An example in which the hot water temperature is kept below the target tank temperature (30 ° C.) will be described.

  First, in step S <b> 100, the room temperature detection unit 72 receives a signal indicating the room temperature from the room temperature thermistor 62, and outputs the received signal to the heating load determination unit 73. Then, the process proceeds to step S102.

  In step S <b> 102, the heating load determination unit 73 compares the signal indicating the room temperature received from the room temperature detection unit 72 with the signal indicating the set temperature (18 ° C.) of the heating terminal 8 received from the remote controller 104. When the room temperature is higher than 18 ° C., the heating load determination unit 73 determines that the heating load of the heating terminal 8 is smaller than the predetermined value, and the process proceeds to step S104. On the other hand, when the room temperature is 18 ° C. or lower, the heating load determination unit 73 determines that the heating load of the heating terminal 8 is equal to or higher than a predetermined value, and the process proceeds to step S106, and normal pump control is performed.

  If it is determined in step S102 that the heating load is smaller than the predetermined value, in step S104, the tank temperature detection unit 71 receives a signal indicating the hot water temperature in the lower part of the hot water tank 2 from the tank thermistor 61, and forwards the received signal. The output is output to the return temperature control unit 74. Then, the process proceeds to step S108.

  In step S108, the forward / return temperature control unit 74 compares the hot water temperature in the lower part of the hot water storage tank 2 with the target tank temperature (30 ° C.). If it is determined that the hot water temperature in the lower part of the hot water storage tank 2 is 30 ° C. or less, the process proceeds to step S118. On the other hand, when it is determined that the hot water temperature in the lower part of the hot water storage tank 2 is higher than 30 ° C., the process proceeds to step S110.

  When it is determined in step S108 that the hot water temperature is higher than 30 ° C., in step S110, the forward / return temperature control unit 74 operates the heating circulation pump 48 at the minimum flow rate and maintains the forward temperature at 45 ° C. The mixing valve 45 is adjusted as follows. Then, the process proceeds to step S112.

  In step S112, the forward / return temperature control unit 74 determines whether or not a predetermined time has elapsed. If the predetermined time has elapsed, the process proceeds to step S114. On the other hand, if the predetermined time has not elapsed, the process repeats step S110.

  When it is determined in step S112 that the predetermined time has elapsed, in step S114, the tank temperature detection unit 71 receives a signal indicating the hot water temperature below the hot water tank 2 from the tank thermistor 61, and sends the received signal to the forward / return temperature. Output to the control unit 74. Then, the process proceeds to step S116.

  In step S116, the forward / return temperature controller 74 compares the hot water temperature in the lower part of the hot water storage tank 2 with the target tank temperature (30 ° C.). If it is determined that the hot water temperature in the lower part of the hot water storage tank 2 is 30 ° C. or less, the process proceeds to step S118. On the other hand, when it is determined that the hot water temperature in the lower part of the hot water storage tank 2 is higher than 30 ° C., the process repeats step S110.

  When it is determined in step S108 or step S116 that the hot water temperature in the lower part of the hot water storage tank 2 is 30 ° C. or less, the forward / return temperature controller 74 stops the operation of the heating circulation pump 48 in step S118. And control operation of the mixing valve 45 for heating and the circulation pump 48 for heating in 1st Embodiment of the heating system of this invention is complete | finished.

  As described above, in the first embodiment of the present invention, when the heating load is smaller than a predetermined value and the supply of hot water to the heating terminal 8 is normally stopped, the heating circulation pump 48 and the mixing valve 45 are controlled to perform heating. By reducing the return temperature of the hot water returning from the load 8 to the lower part of the hot water storage tank 2, the hot water stored in the lower part of the hot water storage tank 2 can be kept sufficiently low. For this reason, when the heating load becomes equal to or higher than the predetermined value and the hot water supply to the heating terminal 8 is started, the low temperature water can be supplied from the hot water storage tank 2 to the heat pump unit 1. As a result, the COP of the heat pump unit 1 is improved as compared with the conventional heating and hot water supply system.

  Furthermore, when the heating load becomes smaller than a predetermined value and the supply of hot water to the heating terminal 8 is stopped, the room temperature rises more than necessary by operating the heating circulation pump 48 at the minimum flow rate. Can be prevented.

  Next, a second embodiment of the present invention will be described. Detailed description of the same elements as those described in the first embodiment is omitted. In this embodiment, the program executed by the control unit 60 is different from the first embodiment, and when it is determined that the heating load of the heating terminal 8 is equal to or higher than a predetermined value, the forward temperature is maintained at 45 ° C. An example will be described in which the flow rate is kept at the minimum flow rate (FIG. 3), and the return temperature is kept below the target return temperature (30 ° C.), particularly 10 ° C., based on the output of the return temperature sensor 47. Other configurations are the same as those of the first embodiment.

  FIG. 5 is a flowchart showing control operations of the heating mixing valve 45 and the heating circulation pump 48 of the heating and hot water supply system according to the second embodiment of the present invention.

  First, in step S <b> 200, the room temperature detection unit 72 receives a signal indicating the ambient temperature of the heating terminal 8 from the room temperature thermistor 62, and outputs the received signal to the heating load determination unit 73. Then, the process proceeds to step S202.

  In step S202, the heating load determination unit 73 compares the signal indicating the ambient temperature of the heating terminal 8 received from the room temperature detection unit 72 with the signal indicating the set temperature (18 ° C.) of the heating terminal 8 received from the remote controller 104. To do. When ambient temperature is higher than 18 degreeC, the heating load judgment part 73 judges that the heating load of the heating terminal 8 is smaller than predetermined value, and a process transfers to step S204. On the other hand, when the ambient temperature is 18 ° C. or lower, the heating load determination unit 73 determines that the heating load of the heating terminal 8 is equal to or greater than a predetermined value, and the process proceeds to step S206, and normal pump control is performed.

  If it is determined in step S202 that the heating load of the heating terminal 8 is smaller than the predetermined value, the forward / return temperature detection unit 70 receives a signal indicating the return temperature from the return temperature sensor 47 in step S204, and receives the received signal. Output to the forward / return temperature controller 74. Then, the process proceeds to step S208.

  In step S208, the forward / return temperature control unit 74 compares the return temperature with the target return temperature (10 ° C.). If it is determined that the return temperature has reached 10 ° C., the process proceeds to step S218. On the other hand, if it is determined that the return temperature has not reached 10 ° C., the process proceeds to step S210.

  If it is determined in step S208 that the return temperature is greater than 30 ° C., in step S210, the forward / return temperature control unit 74 operates the heating circulation pump 48 at the minimum flow rate (FIG. 3) and sets the forward temperature to 45. Adjust mixing valve 45 to maintain at ° C. Then, the process proceeds to step S212.

  In step S212, the forward / return temperature control unit 74 determines whether or not a predetermined time has elapsed. If the predetermined time has elapsed, the process proceeds to step S214. On the other hand, if the predetermined time has not elapsed, the process repeats step S210.

  When it is determined in step S212 that the predetermined time has elapsed, in step S214, the forward / return temperature detection unit 70 receives a signal indicating the return temperature from the return temperature sensor 47, and sends the received signal to the forward / return temperature control unit. Output to 74. Then, the process proceeds to step S216.

  In step S216, the forward / return temperature control unit 74 compares the return temperature with the target return temperature (10 ° C.). If it is determined that the return temperature has reached 10 ° C., the process proceeds to step S218. On the other hand, if it is determined that the return temperature has not reached 10 ° C., the process repeats step S210.

  When it is determined in step S208 or step S216 that the return temperature has reached 10 ° C., in step S218, the forward / return temperature control unit 74 stops the operation of the heating circulation pump 48. Then, the control operation of the heating mixing valve 45 and the heating circulation pump 48 of the heating and hot water supply system according to the second embodiment of the present invention ends.

  As described above, in the second embodiment of the present invention, the same effect as that of the first embodiment can be obtained. Further, the forward / return temperature control unit 74 can control the heating circulation pump 48 and the heating mixing valve 45 based on a signal indicating a return temperature correlated with the lower temperature of the hot water storage tank 2. For this reason, the lower temperature of the hot water storage tank 2 can be easily lowered.

  Next, a third embodiment of the present invention will be described. Detailed description of the same elements as those described in the first embodiment is omitted. In this embodiment (FIGS. 6 and 7), the program executed by the control unit 160 is different from those in the first and second embodiments, and the heating load of the heating terminal 8 is not less than a predetermined value in the heating load determination unit 73. When it is determined that the return flow temperature control unit 80 sets the circulating flow rate to the minimum flow rate (FIG. 3), the heating mixing valve 45 and the switching valve 63 are adjusted so as not to pass through the hot water storage tank 2. An example in which a second circulation circuit for circulating hot water between the circulation pump 48 and the heating terminal 8 is formed and the temperature of the hot water in the lower part of the hot water storage tank 2 is kept below the target tank temperature (30 ° C.) will be described. Other configurations are the same as those of the first and second embodiments.

  FIG. 8 is a flowchart showing control operations of the heating mixing valve 45, the heating circulation pump 48, and the switching valve 63 of the heating hot water supply system according to the third embodiment of the present invention.

  First, in step S300, the room temperature detection unit 72 receives a signal indicating the ambient temperature of the heating terminal 8 from the room temperature thermistor 62, and outputs the received signal to the heating load determination unit 73. Then, the process proceeds to step S302.

  In step S <b> 302, the heating load determination unit 73 compares the signal indicating the room temperature received from the room temperature detection unit 72 with the signal indicating the set temperature (18 ° C.) of the heating terminal 8 received from the remote controller 104. When the room temperature is higher than 18 ° C., the heating load determination unit 73 determines that the heating load of the heating terminal 8 is smaller than the predetermined value, and the process proceeds to step S304. On the other hand, when the room temperature is 18 ° C. or lower, the heating load determination unit 73 determines that the heating load of the heating terminal 8 is equal to or greater than a predetermined value, and the process proceeds to step S306, and normal pump control is performed.

  When it is determined in step S302 that the heating load of the heating terminal 8 is smaller than the predetermined value, the forward / return temperature detection unit 70 receives a signal indicating the return temperature from the return temperature sensor 47 in step S304, and receives the received signal. Output to the forward / return temperature controller 74. Then, the process proceeds to step S308.

  In step S308, the forward / return temperature control unit 80 compares the return temperature with the target return temperature (30 ° C.). If it is determined that the return temperature is 30 ° C. or lower, the process proceeds to step S322. On the other hand, if it is determined that the return temperature is higher than 30 ° C., the process proceeds to step S310.

  When it is determined in step S308 that the return temperature is higher than 30 ° C., in step S310, the forward / return temperature control unit 80 adjusts the heating mixing valve 45 and the switching valve 63 to change the second circulation circuit described above. At the same time, the heating circulation pump 48 is controlled to circulate hot water in the second circulation circuit at the minimum flow rate (second state). Then, the process proceeds to step S312.

  In step S312, the forward / return temperature control unit 80 determines whether a predetermined time has elapsed. If the predetermined time has elapsed, the process proceeds to step S314. On the other hand, if the predetermined time has not elapsed, the process repeats step S310.

  When it is determined in step S312 that the predetermined time has elapsed, in step S314, the forward / return temperature detection unit 70 receives a signal indicating the return temperature from the return temperature sensor 47, and receives the received signal as the forward / return temperature control unit. Output to 80. Then, the process proceeds to step S316.

  In step S316, the forward / return temperature control unit 80 compares the return temperature with the target return temperature (30 ° C.). When it is determined that the return temperature is 30 ° C. or lower, the process proceeds to step S318. On the other hand, if it is determined that the return temperature is higher than 30 ° C., the process repeats step S310.

  If it is determined in step S316 that the return temperature is 30 ° C. or lower, in step S318, the tank temperature detection unit 71 receives a signal indicating the hot water temperature in the lower part of the hot water storage tank 2 from the tank thermistor 61, and forwards the received signal. / Output to return temperature controller 80. Then, the process proceeds to step S320.

  In step S320, the forward / return temperature control unit 80 compares the hot water temperature in the lower part of the hot water storage tank 2 with a predetermined target tank temperature (30 ° C.). When it is determined that the hot water temperature in the lower part of the hot water storage tank 2 is 30 ° C. or lower, the process proceeds to step S322. On the other hand, when it is determined that the hot water temperature in the lower part of the hot water storage tank 2 is higher than 30 ° C., the process proceeds to step S324.

  When it is determined in step S308 or step S320 that the return temperature is 30 ° C. or lower, the forward / return temperature control unit 80 stops the operation of the heating circulation pump 48 in step S322. And control operation of the mixing valve 45 for heating of the heating hot-water supply system of 3rd Embodiment of this invention, the circulation pump 48 for heating, and the switching valve 63 is complete | finished.

  On the other hand, when it is determined in step S320 that the hot water temperature in the lower part of the hot water storage tank 2 is higher than 30 ° C., in step S324, the forward / return temperature control unit 80 adjusts the heating mixing valve 45 and the switching valve 63, A first circulation circuit that circulates the hot water stored in the hot water storage tank 2 between the hot water storage tank 2 and the heating terminal 8 is formed, and the heating circulation pump 48 is controlled so that the hot water is supplied to the first circulation circuit at a minimum flow rate. Is circulated (first state).

  In step S326, the forward / return temperature control unit 80 determines whether or not a predetermined time has elapsed. If the predetermined time has elapsed, the process proceeds to step S328. On the other hand, if the predetermined time has not elapsed, the process repeats step S324.

  When it is determined in step S326 that the predetermined time has elapsed, in step S328, the forward / return temperature detection unit 70 receives a signal indicating the return temperature from the return temperature sensor 47, and receives the received signal as the forward / return temperature control unit. Output to 80. Then, the process proceeds to step S330.

  In step S330, the forward / return temperature control unit 80 compares the return temperature with the target return temperature (30 ° C.). When it is determined that the return temperature is 30 ° C. or lower, the process proceeds to step S318. On the other hand, if it is determined that the return temperature is higher than 30 ° C., the process proceeds to step S332.

  If it is determined in step S330 that the return temperature is higher than 30 ° C., the predetermined time is reset to 0 in step S332. Then, the process proceeds to step S310.

  As described above, in the third embodiment of the present invention, the same effects as those of the first and second embodiments can be obtained. Furthermore, a heating mixing valve 45 and a switch that can form a first state in which hot water circulates through a first circulation circuit that passes through the hot water storage tank 2 and a second state in which hot water circulates through a second circulation circuit that does not pass through the hot water storage tank. Since the valve 63 is provided, when the heating load of the heating terminal 8 becomes smaller than a predetermined value and the supply of hot water to the heating terminal 8 is normally stopped, the second state is set. The hot water temperature that has flowed out can be reliably reduced. For this reason, when the heating load of the heating terminal 8 becomes equal to or higher than the predetermined value and the hot water supply to the heating terminal 8 is started and the state is switched from the second state to the first state, sufficiently low-temperature water is placed in the lower part of the hot water storage tank 2. Can supply. As a result, low-temperature water can be supplied to the heat pump unit 1 from the lower part of the hot water storage tank 2, and the COP of the heat pump unit 1 is improved as compared with the conventional heating hot water supply system.

  FIG. 9 shows experimental data of the capability of the heating terminal 8 corresponding to the return temperature and the return temperature. In this experimental data, each ability is represented by a numerical ratio in which the ability corresponding to an outgoing temperature of 85 ° C. and a return temperature of 60 ° C. is 100% (hereinafter referred to as ability 1). For this reason, for example, the capability corresponding to the forward temperature of 85 ° C. and the return temperature of 30 ° C. is expressed by 48.2% (hereinafter referred to as capability 2), the forward temperature corresponds to 65 ° C. and the return temperature corresponds to 30 ° C. The ability is represented by 35.7% (hereinafter referred to as ability 3), and the ability corresponding to the forward temperature of 45 ° C. and the return temperature of 40 ° C. is represented by 34.0% (hereinafter referred to as ability 4).

  FIG. 10 shows COP experimental data corresponding to the respective capacities shown in FIG. In this experimental data, each COP is represented by a numerical ratio with the COP corresponding to capability 1 as 100%. Therefore, for example, the COP corresponding to capability 2 is represented by 191%, and the COP corresponding to capability 3 is represented by 215%. As shown in the figure, the relationship between the return temperature / return temperature / COP is such that the temperature of the hot water at the lower part of the hot water storage tank 2 is lowered by lowering the return temperature, and the hot water tank 2 is supplied to the heating circuit 5 for heating. Because the hot water temperature to be introduced is lowered, the COP of the heat pump unit 1 is improved, and the amount of heat used in the heating terminal 8 can be reduced by lowering the going temperature, so that the COP of the heat pump unit 1 is improved. Is.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is indicated not only by the above description of the embodiments but also by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

In the first to third embodiments of the present invention, the example in which it is determined whether or not the heating load of the heating terminal 8 is smaller than a predetermined value by comparing the room temperature with the set temperature has been described. The present invention is not limited to such an embodiment. For example, the calculated heating load Q (kWh / day) is calculated based on the following calculation formulas (1) and (2), and the calculated heating load Q (kWh / day) is 0.5 (kWh / day). When exceeding, it judges that the heating load of the heating terminal 8 is more than predetermined value, and when the calculation heating load Q (kWh / day) is 0.5 (kWh / day) or less, the heating load of the heating terminal 8 is predetermined value. You may judge that it is smaller.
V = N × K (1)
Q = ΣV × (LW−RW) (2)
In the equations, V represents the circulation flow rate, N represents the number of rotations of the heating circulation pump 48, K represents a coefficient, LW represents the forward temperature, and RW represents the return temperature.

  Further, it may be determined whether or not the heating load of the heating terminal 8 is smaller than a predetermined value according to the outside temperature detected by the outside temperature sensor 18. Alternatively, it may be determined that the heating load is smaller than a predetermined value when the heating state in the heating terminal 8 is a set heating state corresponding to the set temperature set by the remote controller 104 and continues for a predetermined time. Further, it may be determined whether the heating load is smaller than a predetermined value based on ON / OFF of the “heating” function switch provided in the remote controller 104.

  Moreover, when the day when the minimum outside air temperature of the day becomes higher than the indoor set temperature continues continuously for a predetermined period (for example, 3 days) or more, it may be determined that the heating load is smaller than the predetermined value.

  In addition, when the thermo-on signal from the room thermo installed in the room does not exceed a predetermined time, it may be determined that the heating load is smaller than the predetermined value.

In addition, when the amount of heat QHP generated on the heat pump unit 1 side for a predetermined time (for example, one day) calculated based on the following arithmetic expressions (3) and (4) is smaller than a certain value, It may be determined that the heating load is smaller than a predetermined value.
QHP = ΣV0 × (Tout−Tin) (3)
V0 = N0 × K0 (4)
In the equations, N0 is the number of revolutions of the circulating pump 51 for boiling, K0 is the number of revolutions of the circulating pump 51 for boiling and the number of revolutions of the circulating flow rate of the boiling pump 51, and Tout is the heat pump. The outlet temperature of the unit 1 and Tin indicate the inlet temperature to the heat pump unit 1, respectively.

  Moreover, in the 1st-3rd embodiment of the heating hot-water supply system of this invention, the heating hot-water supply system 100 described the example which has the heating system 101 and the hot-water supply system 102. The present invention is not limited to such an embodiment. It may have only the heating system 101 without the hot water supply system 102.

  By using the present invention, it is possible to obtain a heating system and a heating hot water supply system that can improve COP when the heat pump system is activated.

It is a schematic diagram which shows the structure of the heating hot-water supply system of 1st Embodiment of this invention. It is a block diagram which shows the structure of a control part. It is experimental data which shows the relationship between the circulation flow rate corresponding to each going-out temperature, and return temperature. It is a flowchart which shows the control action of the mixing valve for heating of the heating hot-water supply system of 1st Embodiment of this invention, and the circulation pump for heating. It is a flowchart which shows the control action of the mixing valve for heating of the heating hot-water supply system of 2nd Embodiment of this invention, and the circulation pump for heating. It is a schematic diagram which shows the structure of the heating hot-water supply system of 3rd Embodiment of this invention. It is a block diagram which shows the structure of a control part. It is a flowchart which shows the control action of the mixing valve for heating of the heating hot-water supply system of 3rd Embodiment of this invention, the circulation pump for heating, and a switching valve. The experimental data of the capability of the heating terminal 8 corresponding to the return temperature and the return temperature are shown. The experimental data of COP corresponding to each capability shown in FIG. 9 are shown.

Explanation of symbols

1 Heat pump unit (heat pump system)
2 Hot water storage tank 4 Heating circulation circuit (circulation circuit)
8 Heating terminal 45 Mixing valve for heating (outward temperature control means)
48 Circulation pump for heating (circulation pump)
60, 160 Control unit 61 Tank thermistor (tank temperature sensor)
62 Room temperature thermistor (Ambient temperature sensor)
63 Switching valve (switching means)
73 Heating load determination unit (determination means)
74, 80 Forward / return temperature controller (control means)
DESCRIPTION OF SYMBOLS 100 Heating hot water supply system 101 Heating system 102 Hot water supply system 104 Remote control (setting means)

Claims (15)

A heat pump system,
A hot water storage tank for storing hot water heated by the heat pump system;
A circulation circuit for circulating hot water stored in the hot water storage tank between the hot water storage tank and a heating terminal;
A circulation pump for changing a flow rate of hot water supplied to the heating terminal;
Outward temperature adjusting means for adjusting the outgoing temperature of hot water supplied to the heating terminal;
Control means for controlling at least one of the circulation pump and the forward temperature adjusting means;
Determining means for determining a heating load in the heating terminal;
The control means adjusts the circulating pump and the forward temperature so that the return temperature of the hot water returning from the heating terminal to the hot water storage tank decreases when the determination means determines that the heating load is smaller than a predetermined value. A heating system characterized by controlling at least one of the means.   The control means, when the judging means judges that the heating load is smaller than a predetermined value, the circulating pump and the circulating pump so that the return temperature of the warm water returning from the heating terminal to the hot water storage tank is equal to or lower than the target return temperature. The heating system according to claim 1, wherein at least one of the forward temperature adjusting means is controlled. A return temperature sensor for detecting the return temperature;
The control means controls at least one of the circulation pump and the forward temperature adjusting means based on the output of the return temperature sensor when the determination means determines that the heating load is smaller than a predetermined value. The heating system according to claim 1 or 2. A tank temperature sensor provided in the hot water storage tank;
The heating system according to any one of claims 1 to 3, wherein the control unit controls at least one of the circulation pump and the forward temperature adjusting unit based on an output of the tank temperature sensor.   5. The control unit according to claim 4, wherein the control unit controls at least one of the circulation pump and the forward temperature adjusting unit so that a hot water temperature detected by the tank temperature sensor is equal to or lower than a target tank temperature. Heating system.   The heating system according to claim 5, wherein the tank temperature sensor is provided in a lower portion of the hot water storage tank. A heat pump system,
A hot water storage tank for storing hot water heated by the heat pump system;
A first circulation circuit for circulating hot water stored in the hot water storage tank between the hot water storage tank and a heating terminal;
A circulation pump for changing a flow rate of hot water supplied to the heating terminal;
A second circulation circuit for supplying hot water flowing out from the heating terminal to the circulation pump and circulating between the circulation pump and the heating terminal without passing through the hot water storage tank;
Outward temperature adjusting means for adjusting the outgoing temperature of hot water supplied to the heating terminal;
Switching means for switching between a first state in which hot water circulates in the first circulation circuit and a second state in which hot water circulates in the second circulation circuit;
Control means for controlling at least one of the circulating pump, the forward temperature adjusting means and the switching means;
Determining means for determining a heating load in the heating terminal;
The control means adjusts the circulating pump and the forward temperature so that the return temperature of the hot water returning from the heating terminal to the hot water storage tank decreases when the determination means determines that the heating load is smaller than a predetermined value. The heating system characterized by controlling at least one of the means and the switching means.   The control means, when the judging means judges that the heating load is smaller than a predetermined value, the circulating pump, so that the return temperature of the hot water returning from the heating terminal to the hot water storage tank is equal to or lower than the target return temperature, The heating system according to claim 7, wherein at least one of the forward temperature adjusting means and the switching means is controlled. A return temperature sensor for detecting the return temperature;
The control means, when the judgment means judges that the heating load is smaller than a predetermined value, based on the output of the return temperature sensor, at least one of the circulation pump, the forward temperature adjustment means, and the switching means The heating system according to claim 7 or 8, wherein the heating system is controlled. A tank temperature sensor provided in the hot water storage tank;
The said control means controls at least one of the said circulation pump, the said going temperature adjustment means, and the said switching means based on the output of the said tank temperature sensor, The any one of Claims 7-9 characterized by the above-mentioned. The heating system described.   The said control means controls at least one of the said circulation pump and the said going temperature adjustment means so that the hot water temperature detected by the said tank temperature sensor may become below target tank temperature. Heating system.   The heating system according to claim 11, wherein the tank temperature sensor is provided in a lower part of the hot water storage tank. An ambient temperature sensor for detecting an ambient temperature of the heating terminal;
Setting means for setting a set temperature of the heating terminal,
The said judgment means judges that the said heating load is smaller than predetermined value, when the ambient temperature detected by the said ambient temperature sensor is more than the setting temperature set by the said setting means. The heating system according to any one of 12. Heating system according to any one of claims 1 to 13, wherein the refrigerant is CO ₂ refrigerant. The heating system according to any one of claims 1 to 14,
A heating and hot water supply system, comprising: a heat exchanger disposed in the hot water storage tank and flowing hot water therein.

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