JP4372096B2 - Heat pump water heater and control method of the heat pump water heater - Google Patents

Heat pump water heater and control method of the heat pump water heater Download PDF

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JP4372096B2
JP4372096B2 JP2005364572A JP2005364572A JP4372096B2 JP 4372096 B2 JP4372096 B2 JP 4372096B2 JP 2005364572 A JP2005364572 A JP 2005364572A JP 2005364572 A JP2005364572 A JP 2005364572A JP 4372096 B2 JP4372096 B2 JP 4372096B2
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heat
heat exchanger
heat pump
temperature
circuit
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JP2007170690A (en
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悦雄 柴田
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シャープ株式会社
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  The present invention relates to a heat pump water heater and a control method for the heat pump water heater, and relates to, for example, a heat pump water heater using solar heat and a control method for the heat pump water heater.
  Conventionally, some heat pump water heaters use solar heat from the viewpoint of the environment or the like. For example, a heat pump water heater in which a solar heat collector is arranged on the low pressure side in the refrigerant circuit of the heat pump cycle to collect solar heat, and a heat pump water heater in which a solar heat collector is arranged on the high pressure side in the refrigerant circuit of the heat pump cycle to collect solar heat Alternatively, a heat pump water heater that collects solar heat by arranging a solar heat collector between the high pressure side and the low pressure side in the refrigerant circuit of the heat pump cycle has been devised or commercialized. As an example, JP-A-59-35756 (Patent Document 1) discloses a heat pump water heater.
  The heat pump water heater described in Patent Document 1 includes a solar heat collector, a hot water storage tank, two hot water heat exchangers constituting a heat pump cycle, and a compressor. The heat pump water heater causes the refrigerant collected by the compressor to exchange heat with the water in the hot water tank using the first hot water heat exchanger. And according to conditions, a refrigerant | coolant is heat-collected with a solar-heat collector, and is heat-exchanged with the water of a hot water tank with a 2nd warm water heat exchanger.
  Moreover, the heat pump water heater with a solar system is indicated by Unexamined-Japanese-Patent No. 2004-92934 (patent document 2) as another example of the heat pump water heater using the conventional solar heat.
The heat pump water heater with a solar system described in Patent Document 2 includes a solar system including a collector and a heat exchanger, a heat pump unit, and a hot water storage tank. The heat pump water heater with the solar system warms the water in the hot water storage tank by combining the solar system and the heat pump unit. It has a circuit that circulates the heat collected by the solar system with water or antifreeze, and the water in the tank is heated by a heat exchanger in the lower part of the hot water storage tank. And the water which came out of the intermediate position of the hot water storage tank is heated with a heat pump, and is then circulated to the upper part of the hot water storage tank.
JP 59-35756 A JP 2004-92934 A
  However, in the heat pump water heater disclosed in Patent Document 1, although the heating capability is improved, solar heat cannot be collected unless the compressor is operated. Therefore, power consumption for operating the compressor is necessary even when the solar radiation amount is sufficient, and power consumption of about 70 to 80% when there is no solar radiation amount is necessary, and efficient operation is not possible. On the other hand, a solar heat collection system that does not use a heat pump cycle can collect solar heat only with the power consumption of the circulating water pump, but there is a problem that the hot water storage tank cannot be heated when the amount of solar radiation is not sufficient. Therefore, in the said patent document 1, if a heating capability is raised using solar heat, power consumption will become large.
  Moreover, in the heat pump water heater with a solar system disclosed in Patent Document 2, the heat obtained from the collector and transmitted to the refrigerant is transmitted only to the water in the hot water storage tank. For this reason, when the amount of solar radiation is not sufficient, heat cannot be collected from the collector, and tank water is heated only by a heat pump, and solar heat cannot be fully utilized. That is, in the heat pump water heater with solar system, there is a problem that the amount of solar radiation cannot be fully utilized. Therefore, in the said patent document 2, solar heat cannot fully be utilized but a heating capability is inferior.
  Therefore, the object of the present invention is to solve the above-mentioned problems, efficiently using solar heat, and improving the coefficient of performance of the entire system (a numerical value obtained by dividing heating capacity by power consumption). It is to provide a heat pump water heater.
  The heat pump water heater according to the present invention includes a tank circulation water circuit, a solar heat circulation circuit, a heat pump circuit, a first heat exchanger, a second heat exchanger, and a third heat exchanger. The tank circulating water circuit includes a hot water storage tank that stores the tank circulating water therein. The solar heat circulation circuit includes a solar heat collector that collects solar heat, and the refrigerant circulates. The heat pump circuit includes a compressor, and the refrigerant circulates. The first heat exchanger performs heat exchange between the tank circulating water and the refrigerant heated by the solar heat collector. The second heat exchanger exchanges heat between the circulating water of the tank and the refrigerant that has become high temperature and high pressure by the compressor. The third heat exchanger performs heat exchange between the refrigerant flowing through the solar heat circulation circuit and the refrigerant flowing through the heat pump circuit.
  In the heat pump water heater, a first temperature sensor for measuring the temperature of the tank circulating water exchanged by the first heat exchanger and a second for measuring the temperature of the tank circulating water exchanged by the second heat exchanger. It is preferable to further include a temperature sensor.
  In the heat pump water heater, the operation of the heat pump circuit is interrupted when the outlet temperature of the first heat exchanger of the tank circulating water heated by the first heat exchanger is equal to or higher than the set temperature, and the outlet temperature is lower than the set temperature. It is preferable to further have a control means for operating the heat pump circuit when it becomes low.
In the heat pump water heater, it is preferable to use CO 2 as a refrigerant in the heat pump circuit.
  In the heat pump water heater, the first heat exchanger and the second heat exchanger are preferably arranged in series in the tank circulating water circuit.
  In the heat pump water heater, the hot water tank, the first heat exchanger, and the second heat exchanger are preferably arranged in this order in the direction in which the tank circulating water flows in the tank circulating water circuit.
  The control method of the heat pump water heater of the present invention is a control method of the heat pump water heater, and a determination step of determining whether or not the temperature of the tank circulating water is equal to or higher than the setting due to solar heat collected by the solar heat collector, And a step of operating the heat pump circuit when the temperature is lower than the set temperature in the determination step.
  Thus, according to the present invention, when operating the solar heat circulation circuit, the refrigerant flowing through the heat pump circuit is warmed by the refrigerant flowing through the heat pump circuit by the third heat exchanger. The power consumption for warming up can be reduced. Therefore, the coefficient of performance of the entire system can be improved.
  Embodiments of the present invention will be described below. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.
  FIG. 1 is a schematic diagram showing a heat pump water heater in an embodiment of the present invention. With reference to FIG. 1, the heat pump water heater in Embodiment 1 of this invention is demonstrated. As shown in FIG. 1, the heat pump water heater 20 according to the embodiment of the present invention includes, for example, a tank circulation water circuit 16, a solar heat circulation circuit 4, a heat pump circuit 2, a first heat exchanger 5, and a second heat exchange circuit. A heat exchanger 9 and a third heat exchanger 6 are provided.
  Specifically, as shown in FIG. 1, the heat pump water heater 20 in the embodiment of the present invention includes, for example, a solar heat collector 1, a hot water storage tank 3, a first heat exchanger 5, and a third heat exchanger 6. A solar heat utilization refrigerant circulation pump 7, a compressor 8 as refrigerant heating means, a second heat exchanger 9, an air heat exchanger 10, a throttle mechanism 11, a tank circulation water pump 12, and a control means 13. And a first temperature sensor 14 and a second temperature sensor 15.
  The solar heat collector 1 collects solar heat. The hot water storage tank 3 stores the circulating water in the tank. The first heat exchanger 5 exchanges heat between the tank circulating water and the refrigerant heated by the solar heat collector 1. The third heat exchanger 6 exchanges heat between the refrigerant flowing through the solar heat circulation circuit 4 and the refrigerant flowing through the heat pump circuit 2. In the present embodiment, the third heat exchanger 6 exchanges heat between the refrigerant heat-exchanged by the second heat exchanger 9 and the refrigerant heat-exchanged by the solar heat collector 1. The solar heat utilization refrigerant circulation pump 7 circulates the refrigerant flowing through the solar heat circulation circuit 4. As the compressor 8, an inverter compressor capable of capacity control with the rotational speed is used in the present embodiment. The second heat exchanger 9 performs heat exchange between the tank circulating water and the refrigerant heated by the compressor 8. The air heat exchanger 10 exchanges heat between the refrigerant and the outside air (air). The throttle mechanism 11 expands the refrigerant. The tank circulating water pump 12 circulates the tank circulating water flowing through the tank circulating water circuit 16.
  Based on the temperature measured by the first temperature sensor 14 and the second temperature sensor 15, the control means 13 uses the solar heat utilization refrigerant circulation pump 7, the compressor 8, the air heat exchanger 10, the throttle mechanism 11, and the tank circulation water. The pump 12 is controlled. A dotted line in FIG. 1 indicates a control line by the control means 13. The control means 13 interrupts the operation of the heat pump circuit 2 when the outlet temperature of the first heat exchanger 5 of the tank circulating water heated by the first heat exchanger 5 is equal to or higher than the set temperature, and the outlet temperature Has a function of operating the heat pump circuit 2 when becomes lower than the set temperature.
  The first temperature sensor 14 measures the temperature of the tank circulating water heat-exchanged by the first heat exchanger 5. The second temperature sensor 15 measures the temperature of the tank circulating water heat-exchanged by the second heat exchanger 9. In the present embodiment, the first temperature sensor 14 and the second temperature sensor 15 are thermistors covered with a sheath thermocouple or a protective tube. And the temperature sensing part of a sensor is inserted in piping near the exit of the tank circulating water in the 1st heat exchanger 5 and the 2nd heat exchanger 9. Although the accuracy of temperature measurement is slightly inferior, the thermistor can be attached by a clip-like attachment spring.
  The tank circulating water circuit 16 includes a hot water storage tank 3, a first temperature sensor 14, and a second temperature sensor 15. In the tank circulating water circuit 16, the first heat exchanger 5 and the second heat exchanger 9 are arranged in series. “Arranged in series” means that the tank circulating water circuit has one flow path, and the first heat exchanger 5 and the second heat exchanger 9 are disposed along the tank circulating water circuit 16. To do. In the present embodiment, the hot water storage tank 3, the first heat exchanger 5, and the second heat exchanger 9 are arranged in this order in the direction in which the tank circulating water flows in the tank circulating water circuit 16. That is, the tank circulating water circulates in the order of the hot water storage tank 3, the first heat exchanger 5, and the second heat exchanger 9. Specifically, the tank circulating water flows out from the lower side of the hot water storage tank 3, passes through the first heat exchanger 5 and the second heat exchanger 9, and flows into the upper side of the hot water storage tank 3. It is circulated by.
  The first temperature sensor 14 is disposed between the outlet of the first heat exchanger 5 and the inlet of the second heat exchanger 9. The first temperature sensor 14 is not particularly limited as long as it is disposed between the inlet of the first heat exchanger 5 and the outlet of the second heat exchanger 9. For example, it is preferable to arrange in the vicinity of the outlet of the first heat exchanger 5 from the viewpoint of accurately measuring the temperature of the tank circulating water after the heat exchange in the first heat exchanger 5.
  The second temperature sensor 15 is disposed between the outlet of the second heat exchanger 9 and the inflow place 3 a of the hot water storage tank 3. In addition, the 2nd temperature sensor 15 will not be specifically limited if it is arrange | positioned between the exit of the 2nd heat exchanger 9, and the inflow place 3a of the hot water storage tank 3. FIG. For example, it is preferable to arrange in the vicinity of the outlet of the second heat exchanger 9 from the point of accurately measuring the temperature of the tank circulating water after the heat exchange in the second heat exchanger 9.
  The inflow place 3 a where the tank circulating water flowing out from the second heat exchanger 9 flows into the hot water storage tank 3 is relatively above the hot water storage tank 3. The inflow place 3 a is not particularly limited as long as it is disposed relatively above the hot water storage tank 3. For example, the inflow place 3a is preferably provided in the vicinity of the highest position with respect to the surface on which the hot water storage tank 3 is installed. Further, the outflow location 3 b from which the tank circulating water flows out of the hot water storage tank 3 is relatively below the hot water storage tank 3. If the outflow place 3b is arrange | positioned in the downward direction of the hot water storage tank 3, it will not be specifically limited. For example, the outflow location 3b is preferably provided in the vicinity of the lowest position with respect to the surface on which the hot water storage tank 3 is installed. With such an arrangement, in the tank circulating water circuit 16, the tank circulating water below the hot water storage tank 3 has a relatively low temperature, and the low-temperature tank circulating water is connected to the first heat exchanger 5 and the second heat exchanger 5. By passing through the heat exchanger 9, it becomes a temperature near the set temperature. Since the relatively high-temperature tank circulating water has a low specific gravity, the tank circulating water relatively above the hot water storage tank 3 has a high temperature. By operating the tank circulating water circuit 16, the low temperature tank circulating water flows out from the outflow place 3 b located below the hot water storage tank 3, and the high temperature tank circulating water flows into the hot water storage tank 3 above the inflow. The inflow from the place 3a is repeated. Thereby, the ratio of the high-temperature tank circulating water stored in the hot water storage tank 3 increases, and the whole hot water storage tank 3 can be made high temperature. Therefore, it becomes easy to raise the whole hot water storage tank 3 to a predetermined temperature, and the capacity of the hot water storage tank 3 can be used effectively.
  The solar heat circulation circuit 4 includes a solar heat collector 1 and a solar heat utilization refrigerant circulation pump 7. A first heat exchanger 5 and a third heat exchanger 6 are arranged along the solar heat circulation circuit 4. In the present embodiment, the first heat exchanger 5 and the third heat exchanger 6 are arranged in series in the solar heat circulation circuit 4. The refrigerant used in the solar heat circulation circuit 4 is water or antifreeze. The refrigerant circulates in the order of the solar heat collector 1, the first heat exchanger 5, and the third heat exchanger 6. The solar thermal circuit 4 is not particularly limited to this configuration. For example, the refrigerant may have a branch member that can pass through both the first heat exchanger 5 and the third heat exchanger 6 in parallel after leaving the solar heat collector 1.
The heat pump circuit 2 includes a compressor 8, an air heat exchanger 10, and a throttle mechanism 11. A third heat exchanger 6 and a second heat exchanger 9 are arranged along the heat pump circuit 2. In the present embodiment, the third heat exchanger 6 and the second heat exchanger 9 are arranged in series in the heat pump circuit 2. The refrigerant used in the heat pump circuit 2 is set to CO 2. The refrigerant circulates in the order of the compressor 8, the second heat exchanger 9, the throttle mechanism 11, the air heat exchanger 10, and the third heat exchanger 6. In order to operate the air heat exchanger 10, an outdoor heat exchanger fan motor (not shown) is provided.
The refrigerant used in the heat pump circuit 2 is not particularly limited to CO 2. For example, HCFC (hydrochlorofluorocarbon) or HFC (hydrofluorocarbon) can also be used. Use of a CO 2 refrigerant is preferable because high-temperature hot water supply is possible and the global warming potential is small.
  Next, the operation of the heat pump water heater 20 will be described with reference to FIGS. 1 and 2. FIG. 2 is a flowchart showing a control method of the heat pump water heater in the embodiment of the present invention.
  First, the operation of the tank circulating water circuit 16 will be described with reference to FIG. In the tank circulation water circuit 16, heat exchange is performed between the tank circulation water stored in the hot water storage tank 3 and the refrigerant flowing through the solar heat circulation circuit 4 in the first heat exchanger 5. And in the 2nd heat exchanger 9, heat exchange is performed between the refrigerant | coolant which flows through the heat pump circuit 2, and tank circulating water. In addition, when the combined operation of the solar heat circulation circuit 4 and the heat pump circuit 2 is not performed, the tank circulating water performs heat exchange in the first heat exchanger 5 and the second heat exchanger 9 that are not operated. Pass without doing.
  Next, the operation of the solar thermal circuit 4 will be described with reference to FIG. In the solar heat circulation circuit 4, the refrigerant heat-exchanged by the solar heat collector 1 exchanges heat with the tank circulation water in the first heat exchanger 5. Then, heat is exchanged in the third heat exchanger 6 between the refrigerant that has finished heat exchange in the first heat exchanger 5 and the refrigerant that flows through the heat pump circuit 2 that has finished heat exchange in the second heat exchanger 9. . The third heat exchanger 6 can warm the refrigerant flowing through the heat pump circuit 2.
  Next, the operation of the heat pump circuit 2 will be described with reference to FIG. In the heat pump circuit 2, the refrigerant is brought into a high-temperature and high-pressure state by the compressor 8, and heat is exchanged between the tank circulating water and the refrigerant in the second heat exchanger 9. Then, the refrigerant is brought into a low-temperature and low-pressure state by the throttle mechanism 11, and heat is exchanged between the outside air (air) and the refrigerant in the air heat exchanger 10. Then, heat is exchanged between the refrigerant in the third heat exchanger 6 and the refrigerant whose heat exchange is completed in the first heat exchanger 5 in the solar heat circulation circuit 4.
  Next, an example of a method for controlling the heat pump water heater 20 will be described with reference to FIGS. 1 and 2.
  As shown in FIG. 2, first, a step (S10) for performing determination during daytime and sunshine is performed, and after it is determined YES in step (S10), the solar heat circulation circuit 4 is operated (step S20). In this step (S20), for example, the solar heat utilization refrigerant circulation pump 7 is operated. Thereby, the tank circulating water can be heated by the refrigerant flowing through the solar heat circulation circuit 4 in the first heat exchanger 5. Further, in this step (S20), since the operation of the heat pump circuit 2 is interrupted, the tank circulating water only passes through the second heat exchanger 9 and heat exchange is not performed. In this step (S20), the solar circulation circuit 4 is operated, and the tank circulation water circuit 16 is also operated by the tank circulation water pump 12.
  Next, the process (S21) of determining whether the 1st temperature sensor 14 is more than preset temperature is implemented. The step (S21) is performed in order to perform a determination step of determining whether the temperature of the tank circulating water has become equal to or higher than the set temperature due to the solar heat collected by the solar heat collector 1. The determination step of determining whether or not the temperature of the tank circulating water has reached or exceeded the set value by the solar heat collected by the solar heat collector 1 determines whether or not the amount of solar heat is sufficient. However, it is not particularly limited to the step (S21) as long as it includes a determination step for determining whether or not the tank circulating water is heated above a certain temperature by the solar heat collected by the solar heat collector 1. For example, the determination step of measuring the tank circulating water at the outlet of the first heat exchanger 5 with a calorimeter and determining whether or not the heat amount of the tank circulating water is equal to or higher than the set heat amount by the solar heat collected by the solar heat collector 1. May be provided.
  In the step (S21), if the first temperature sensor 14 is equal to or higher than the set temperature, it is determined YES. Note that the case where YES is determined is, for example, a case where there is sufficient solar radiation in the daytime.
  In the step (S21), when the first temperature sensor 14 is lower than the set temperature, it is determined as NO. In addition, the case where it is determined to be NO includes a case where the solar radiation is insufficient in the daytime and cloudy, morning or evening, and the case where there is no solar radiation due to nighttime or rain.
  As described above, the step (S21) of determining whether or not the first temperature sensor 14 is equal to or higher than the set temperature is performed while operating the solar heat circulation circuit 4. In this step (S21), if the first temperature sensor 14 is equal to or higher than the set temperature, it is determined YES. Then, it returns to a start again and the process (S20) which operates the above-mentioned solar thermal circuit 4 is repeated. When solar heat cannot be used, from the viewpoint of reducing power consumption, the operation of the solar heat circulation circuit 4 is interrupted and the compressor 8 or the like is operated to operate only the heat pump circuit 2 as in step (S40). To do. Next, in the step (S21), when the first temperature sensor 14 is lower than the set temperature, it is determined as NO. Then, the process (S30) which operates the solar thermal circulation circuit 4 and the heat pump circuit 2 is implemented.
  If it is determined NO in the step (S21), a step (S30) of operating the solar heat circulation circuit 4 and the heat pump circuit 2 is performed. In this step (S30), the solar circulation circuit 4 and the heat pump circuit 2 are operated, and the tank circulation water circuit 16 is also operated by the tank circulation water pump 12.
  In this step (S30), the solar heat circulation circuit 4 and the heat pump circuit 2 are operated. In this case, the solar heat utilization refrigerant circulation pump 7 and the compressor 8 are operated.
  Next, a step (S31) of determining whether or not the second temperature sensor 15 is at a set temperature is performed. If the second temperature sensor 15 is at the set temperature, YES is determined in step (S31). Then, it returns to the start again and repeats the determination of the continuation of operation of the solar thermal circulation circuit 4 and the heat pump circuit 2. When the second temperature sensor 15 is not the set temperature (step 32) and the second temperature sensor 15 is lower than the set temperature, it is determined NO in the step (S32). In this case, a step of increasing the rotational speed of the compressor 8 (S33) is performed.
  In the step (S33), an increase in the temperature of the refrigerant flowing through the heat pump circuit 2 can be suppressed by increasing the rotation speed of the compressor 8 using the compressor. Thereby, while being able to maintain the temperature of tank circulating water at preset temperature, the power consumption required to operate the compressor 8 grade | etc., Can be reduced.
  In addition, when it is judged as YES in a process (S32), the process (S34) which reduces the rotation speed of the compressor 8 is implemented from a viewpoint of reducing power consumption.
  Next, also during the operation of only the heat pump (step 40), the steps (S31) to (S34) are similarly performed.
  Next, a specific operation will be described for a case where there is a sufficient amount of solar heat, a case where the amount of solar heat is not enough, and a case where there is no amount of solar heat.
  First, the case where there is a sufficient amount of solar heat will be described. In this case, the heat pump circuit 2 is not operated, and the solar heat circulation circuit 4 is operated. Specifically, the refrigerant that has obtained heat from the solar heat collector 1 performs heat exchange with the tank circulating water in the first heat exchanger 5. Thereby, the tank circulating water is heated. The heated tank circulating water enters the hot water storage tank 3 from the inflow place 3a of the hot water storage tank 3 and is stored therein.
  For example, when the tank circulating water flowing out from the hot water storage tank 3 is 15 ° C. and the set temperature of the first temperature sensor 14 is 60 ° C., the temperature of the tank circulating water at the outlet of the first heat exchanger 5 is about 60 ° C. Is warmed.
  In the case where there is a sufficient amount of solar heat, the power consumption required to set the heating capacity to 4500 W does not operate the heat pump circuit 2. For example, the power consumption of the solar heat utilization refrigerant circulation pump 7 is 50 W and the tank circulation The total is 50 W, which is the power consumption of the water pump 12, resulting in 100 W. In this case, the coefficient of performance is 45 (= 4500 W / 100 W).
  Next, a case where the amount of solar heat is not sufficient will be described. In this case, the combined operation of the heat pump circuit 2 and the solar heat circulation circuit 4 is performed. Specifically, the temperature of the first temperature sensor 14 is detected by the control means 13, and when the temperature is lower than the set temperature, the heat pump circuit 2 is operated. The refrigerant that has obtained heat from the solar heat collector 1 performs heat exchange with the tank circulating water in the first heat exchanger 5. Thereby, the tank circulating water is heated. Thereafter, the refrigerant exchanges heat with the refrigerant flowing through the heat pump circuit 2 in the third heat exchanger 6. Thereby, the refrigerant | coolant which flows through the heat pump circuit 2 is heated. Then, the refrigerant flowing through the solar heat circulation circuit 4 enters the solar heat collector 1 again through the solar heat utilization refrigerant circulation pump 7. On the other hand, the refrigerant flowing through the heat pump circuit 2 evaporates by the heat obtained by the air heat exchanger 10 and the third heat exchanger 6, becomes high-temperature and high-pressure gas by the compressor 8, and is circulated by the tank in the second heat exchanger 9. Exchange heat with water. Thereby, tank circulating water is fully heated.
  For example, the set temperature of the first temperature sensor 14 and the second temperature sensor 15 is set to 60 ° C., and since the set temperature is not reached by the first temperature sensor 14, the heat pump circuit 2 is operated via the control means. And When the tank circulating water flowing out from the hot water storage tank 3 is 15 ° C., it is heated to about 30 ° C. at the outlet of the first heat exchanger 5. Then, the tank circulating water at about 30 ° C. at the outlet of the first heat exchanger 5 is heated to about 60 ° C. at the outlet of the second heat exchanger 9. The control means 13 detects the temperature of the second temperature sensor 15 and controls the rotational speed of the compressor 8 so that this temperature becomes the set temperature.
  In the case where the amount of heat of solar heat is not sufficient, the tank circulating water receives half the amount of heat required by the first heat exchanger 5 and receives the remaining half of the amount of heat by the second heat exchanger 9. In this case, since the rotation speed of the compressor 8 may be about half, the power consumption of the compressor 8 is about 50% when the solar heat circulation circuit 4 is not operated. Moreover, since the temperature of the refrigerant | coolant which flows through the heat pump circuit 2 rises with the 3rd heat exchanger 6, the power consumption of the compressor 8 will be about 88% when the 3rd heat exchanger 6 is not provided. Therefore, the power consumption of the compressor 8 of the heat pump water heater 20 is about 44% with respect to the power consumption of the compressor when the first heat exchanger 5 and the second heat exchanger 9 are not provided. The power consumption required to set the heating capacity to 4500 W is, for example, 400 W that is the power consumption of the compressor 8, 50 W that is the power consumption of the outdoor heat exchanger fan motor, and the power consumption of the solar heat utilization refrigerant circulation pump 7. And 50W that is the power consumption of the tank circulating water pump 12 are 550W. In this case, the coefficient of performance is 8.18 (= 4500 W / 590 W). In addition, since the rotation speed of the compressor 8 can be lowered as the amount of solar radiation increases, the power consumption can be reduced, and as a result, the coefficient of performance increases.
  Next, a case where there is no solar heat quantity will be described. In this case, the solar heat circulation circuit 4 is not operated, and only the heat pump circuit 2 is operated. Specifically, heat exchange is performed between the refrigerant flowing through the heat pump circuit 2 and the tank circulating water in the second heat exchanger 9.
  For example, when the set temperature of the second temperature sensor 15 is 60 ° C. and the tank circulating water flowing out of the hot water storage tank 3 is 15 ° C., the outlet of the second heat exchanger 9 is heated to about 60 ° C. Then, the heated tank circulating water enters the hot water storage tank 3 from the inflow place 3a of the hot water storage tank 3 and is stored therein.
  In the case where there is no amount of solar heat, the power consumption required to set the heating capacity to 4500 W is only to operate the heat pump circuit 2. For example, 900 W which is the power consumption of the compressor 8 and the outdoor heat exchanger fan motor The sum of the power consumption of 50 W and the power consumption of the tank circulating water pump 12 is 50 W, which is 1000 W. In this case, the coefficient of performance is 4.5 (= 4500 W / 1000 W).
  In addition, in the electric power company, the electricity bill at night is set to about one third of the daytime for smoothing the electric power. For electric water heaters, the tank circulating water that consumes electricity mainly at night is heated and kept at a set temperature, and the tank circulating water stored when necessary is used. Is economical. The heat pump water heater 20 in the present embodiment is an electric type. For example, in a timer provided in the control means 13, the night time zone is 40% to 70% of the amount of hot water in the tank circulating water required by the operation of the heat pump circuit 2. % Is heated, and the remaining amount of hot water in the daytime is controlled by the operation of the solar heat circulation circuit 4 or the combined operation of the solar heat circulation circuit 4 and the heat pump circuit 2. Thereby, energy saving can be aimed at as the whole system, and a coefficient of performance can be improved.
  Next, the coefficient of performance when the heat pump water heater 20 in the embodiment of the present invention is used in units of one day and the coefficient of performance of the heat pump water heater outside the scope of the present invention will be described.
  For example, on a sunny day, the heat pump circuit 2 is not operated for 2 hours after noon, but the tank circulating water is heated only by the solar heat circuit 4, and the heat pump circuit 2 is operated and solar heat for the remaining 4 hours. The operation is combined with the operation of the circulation circuit 4. In this case, the daily power consumption is about 40% of the power consumption as compared with the operation of the heat pump circuit 2 alone. That is, the power consumption required to set the heating capacity to 4500 W is 400 W (1000 W × 0.4). Therefore, the coefficient of performance in this case is approximately 11.3 (4500 W / 400 W).
  On the other hand, in a heat pump water heater provided with only the heat pump circuit 2, the coefficient of performance is the same as that at nighttime operation, so 4.5. Therefore, according to the heat pump water heater 20 in the embodiment of the present invention, the coefficient of performance is greatly improved.
  In a heat pump water heater that does not include the third heat exchanger 6, the power consumption of the compressor is approximately 114% (= 1 / 0.88) of the case where the third heat exchanger 6 is provided. Therefore, the necessary power consumption increases by 7.6 W (= 400 W × (0.114 × 4/24)), and thus becomes 407.6 W. Therefore, the coefficient of performance in this case is about 11.0 (4500 W / 407.6 W). According to the heat pump water heater 20 of the present invention, since the third heat exchanger 6 is provided, the coefficient of performance is improved.
  As described above, according to the heat pump water heater 20 of the present invention, when the solar heat circulation circuit 4, the heat pump circuit 2, and the tank circulation water circuit 16 are operated, in the third heat exchanger 6, the first heat The refrigerant that has exchanged heat with the tank circulating water by the exchanger 5 exchanges heat with the refrigerant that has finished heat exchange with the tank circulating water by the second heat exchanger 9. Therefore, since the refrigerant flowing through the heat pump circuit 2 is warmed by the refrigerant flowing through the solar heat circulation circuit 4 while maintaining the heating capacity, power consumption for warming the refrigerant flowing through the heat pump circuit 2 can be reduced. Therefore, the coefficient of performance (the numerical value obtained by dividing the heating capacity by the power consumption) of the entire system of the heat pump water heater 20 can be improved.
  Further, when the solar heat circulation circuit 4 is not operated, the heat pump circuit 2 and the tank circulation water circuit 16 are operated, so that the operation is the same as a normal heat pump water heater. Therefore, it does not affect the coefficient of performance that is improved when the solar heat circulation circuit 4 is operated. Therefore, the coefficient of performance of the entire system of the heat pump water heater 20 in the embodiment of the present invention including the case where the solar heat circulation circuit 4 is not operated can be improved.
  Further, the heat pump water heater 20 may include the first temperature sensor 14 and the second temperature sensor 15. Thereby, the tank circulating water temperature after passing the 1st heat exchanger 5 and the 2nd heat exchanger 9 is measurable. Therefore, the operation of the heat pump circuit 2 can be properly controlled based on the temperature of the tank circulating water measured by the first temperature sensor 14. Further, the compressor 8 in the heat pump circuit 2 can be appropriately controlled based on the temperature of the tank circulating water measured by the second temperature sensor 15.
  Moreover, in the heat pump water heater 20, the operation of the heat pump circuit 2 is interrupted when the outlet temperature of the first heat exchanger 5 of the tank circulating water heated by the first heat exchanger 5 is equal to or higher than the set temperature. You may have the control means 13 which performs the driving | operation of the heat pump circuit 2, when an exit temperature becomes lower than preset temperature. By interrupting the operation of the heat pump circuit 2 when the outlet temperature of the first heat exchanger 5 is equal to or higher than the set temperature, the power consumption necessary for the operation of the heat pump circuit 2 can be reduced. Further, by operating the heat pump circuit 2 when the outlet temperature of the first heat exchanger 5 becomes lower than the set temperature, the temperature of the tank circulating water stored in the hot water storage tank 3 can be set to the set temperature. Therefore, by providing the control means 13, the coefficient of performance of the entire system of the heat pump water heater 20 can be further improved, and the temperature of the tank circulating water can be maintained at the set temperature.
In the heat pump water heater 20, CO 2 may be used as a refrigerant in the heat pump circuit. In the heat pump water heater 20, since the heat pump circuit 2 has one flow path, connection pipes between devices such as the compressor 8 included in the heat pump circuit 2 may be connected by brazing or welding without being connected by a joint or the like. it can. For this reason, since the risk of leakage of the refrigerant is extremely low, high-pressure CO 2 can be used as the refrigerant of the heat pump circuit. Therefore, the heat pump water heater 20 can use high-temperature hot water supply and can use a CO 2 refrigerant having a low global warming potential.
  In the heat pump water heater 20, the first heat exchanger 5 and the second heat exchanger 9 may be arranged in series in the tank circulating water circuit 16. Thereby, since the tank circulating water flows into and out of the hot water storage tank 3 as one flow path, it becomes easy to monitor the temperature of the tank circulating water stored in the hot water storage tank 3. Therefore, it is possible to easily control the operation of the heat pump circuit 2.
  In the heat pump water heater 20, the hot water storage tank 3, the first heat exchanger 5, and the second heat exchanger 9 may be arranged in this order in the direction in which the tank circulating water flows in the tank circulating water circuit 16. Thus, when the solar heat circulation circuit 4 is operated, if the tank circulating water heat-exchanged by the first heat exchanger 5 has not reached the set temperature, the second heat exchanger 9 further causes the tank circulating water to The tank circulating water can be raised to a set temperature by exchanging heat with it. Therefore, power consumption can be further reduced.
  The control method of the heat pump water heater 20 in the embodiment of the present invention is a control method of the heat pump water heater 20, and it is determined whether or not the temperature of the tank circulating water is equal to or higher than the set value by the solar heat collected by the solar collector 1. A determination step (S10) for determination and a step (S30) of operating the heat pump circuit 2 when the temperature is lower than the set temperature in the determination step (S10). Thereby, the operation of the heat pump circuit 2 is performed according to the determination in the determination step (S10). Therefore, the heat pump circuit 2 is operated only when the operation of the heat pump circuit 2 is necessary. Therefore, since the power consumption for operating the heat pump circuit 2 can be reduced, the coefficient of performance of the entire system of the heat pump water heater 20 can be further improved.
  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above-described embodiment but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.
It is a schematic diagram which shows the heat pump water heater in embodiment of this invention. It is a flowchart which shows the control method of the heat pump water heater in embodiment of this invention.
Explanation of symbols
  DESCRIPTION OF SYMBOLS 1 Solar heat collector, 2 Heat pump circuit, 3 Hot water tank, 3a Inflow place, 3b Outflow place, 4 Solar heat circulation circuit, 5 1st heat exchanger, 6 3rd heat exchanger, 7 Solar heat utilization refrigerant circulation pump, 8 Compressor, 9 Second heat exchanger, 10 Air heat exchanger, 11 Throttle mechanism, 12 Tank circulating water pump, 13 Control means, 14 First temperature sensor, 15 Second temperature sensor, 16 Tank circulating water circuit, 20 Heat pump water heater.

Claims (7)

  1. A tank circulating water circuit including a hot water storage tank for storing the tank circulating water inside,
    A solar heat circulation circuit including a solar heat collector that collects solar heat and circulating a refrigerant;
    A heat pump circuit including a refrigerant heating means and circulating the refrigerant;
    A first heat exchanger that exchanges heat between the tank circulating water and the refrigerant heated by the solar collector;
    A second heat exchanger for exchanging heat between the tank circulating water and the refrigerant heated by the refrigerant heating means;
    A heat pump water heater comprising: a third heat exchanger that exchanges heat between the refrigerant flowing through the solar heat circulation circuit and the refrigerant flowing through the heat pump circuit.
  2. A first temperature sensor for measuring a temperature of the tank circulating water exchanged by the first heat exchanger;
    The heat pump water heater according to claim 1, further comprising a second temperature sensor that measures a temperature of the tank circulating water heat-exchanged by the second heat exchanger.
  3.   When the outlet temperature of the first heat exchanger of the tank circulating water heated by the first heat exchanger becomes equal to or higher than a preset temperature, the operation of the heat pump circuit is interrupted, and the outlet temperature is lower than the preset temperature. The heat pump water heater according to claim 1 or 2, further comprising control means for operating the heat pump circuit when the temperature becomes low.
  4. The heat pump water heater according to any one of claims 1 to 3, wherein CO 2 is used as a refrigerant of the heat pump circuit.
  5.   The heat pump water heater according to any one of claims 1 to 4, wherein the first heat exchanger and the second heat exchanger are arranged in series in the tank circulating water circuit.
  6.   The heat pump water heater according to claim 5, wherein the hot water storage tank, the first heat exchanger, and the second heat exchanger are arranged in this order in a direction in which the tank circulating water flows in the tank circulating water circuit.
  7. It is the control method of the heat pump water heater of any one of Claims 1-6,
    A determination step of determining whether the temperature of the tank circulating water is equal to or higher than a set temperature by solar heat collected by the solar heat collector;
    And a step of operating the heat pump circuit when the temperature is lower than the set temperature in the determination step.
JP2005364572A 2005-12-19 2005-12-19 Heat pump water heater and control method of the heat pump water heater Expired - Fee Related JP4372096B2 (en)

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Application Number Priority Date Filing Date Title
JP2005364572A JP4372096B2 (en) 2005-12-19 2005-12-19 Heat pump water heater and control method of the heat pump water heater

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JP4372096B2 true JP4372096B2 (en) 2009-11-25

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JP2009281644A (en) * 2008-05-21 2009-12-03 Daikin Ind Ltd Heating system
CN101839585B (en) * 2009-03-20 2013-07-10 大连中星科技开发有限公司 Solar energy-air source heat pump composite system suitable for microthermal climate
JP5535554B2 (en) * 2009-08-27 2014-07-02 エナテックス株式会社 Solar water heating system with heat pump backup heat source
CN101650050B (en) * 2009-09-08 2011-09-21 黄永生 Control system of pressure-limiting glass evacuated solar water heater without water tank
CN101666548B (en) * 2009-09-15 2011-04-13 高秀明 Solar heat pump water heater for commercial use
CN101957063B (en) * 2010-10-15 2012-10-03 浙江大学 All-weather solar and sewage energy mixed auxiliary heat pump water heater system
JP5701084B2 (en) * 2011-02-02 2015-04-15 東芝キヤリア株式会社 Heating system
EP2864710A4 (en) 2012-06-12 2016-02-17 Endless Solar Corp Ltd A solar energy system
AU2013273921B2 (en) * 2012-06-12 2017-09-07 Endless Solar Corporation Ltd A solar energy system
CN104236089B (en) * 2013-06-20 2017-06-06 广东美的暖通设备有限公司 Water heater and its control method
JP2014037963A (en) * 2013-10-25 2014-02-27 Enetecs Kk Solar heat hot water supply system
KR101449561B1 (en) 2014-02-27 2014-10-14 홍익대학교 산학협력단 Building intergrated photovoltaic thermal system
JP6317154B2 (en) * 2014-03-26 2018-04-25 大和ハウス工業株式会社 Hot water system
KR101745902B1 (en) * 2015-11-04 2017-06-13 주식회사 탑솔 Hybrid heat pump system by using complex use of air heat and solar thermal

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