JP6040872B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type water heater.

  Hot water storage hot water heaters that store hot water generated by heating means that heats water (for example, heat pump devices that use a refrigeration cycle) in hot water storage tanks and take out hot water from hot water storage tanks as needed to supply hot water are widely used. It has been. Conventionally, hot water storage hot water heaters for household use have a hot water storage operation during the midnight hours when the unit price of electricity is lower than the daytime hours when hot water is generated by operating the heating means and stored in the hot water storage tank. It is common to do. This midnight time zone is usually about 8 hours (for example, from 23:00 to 7:00 the next morning). For this reason, the hot water storage operation is controlled so that the hot water storage operation ends just before 7:00 in the morning.

  When multiple such hot water storage hot water heaters for home use are used in an apartment, etc., almost all of the multiple hot water storage water heaters are in the time zone before 7:00 when the midnight time zone ends. The hot water storage operation is performed. Therefore, there is a case where it is necessary to increase the capacity of the power receiving facility of the entire apartment house. With the increase in capacity of the power receiving equipment, there is a problem that the power receiving equipment becomes expensive.

  In addition, although there are a wide variety of contract forms with power supply companies, high-voltage power reception may be required in facilities that require a large capacity (for example, 50 kW or more). The contract power in this high voltage power reception is calculated as the largest value among the maximum demand power in each month in the past year including the current month. Here, the maximum demand power is the largest value in a month among all the power used in the facility, which is measured every demand period (for example, 30 minutes). For this reason, if the power used for each demand period exceeds the contract power even once, the maximum value of the maximum demand power is updated, so the contract power increases and the basic charge increases. Since then, the basic charge will continue for a minimum of one year, resulting in a high electricity charge. For this reason, it is important to suppress the maximum demand power as much as possible so that the contracted power is not increased in order to reduce the electricity bill in the facility as described above.

  In Patent Document 1, in a heat pump hot water supply system that receives power supply from a branch breaker connected to the secondary side of the main breaker, the operation of the heat pump is continued based on the detected value of the amount of electricity flowing to the main breaker. A system is disclosed that reduces the power consumption of other load devices such as a room air conditioner to keep the amount of electricity flowing through the main breaker within an allowable range. In Patent Document 1, this system avoids all blackouts, continuously performs hot water supply by a heat pump water heater, and continues to operate other load devices as much as possible.

JP 2006-17434 A

  However, when the heat pump hot water supply system of Patent Document 1 is implemented in an apartment house, each unit is provided with a means for detecting the amount of power flowing to the main breaker, and other load devices such as room air conditioners and a hot water supply system control microcomputer are provided. In addition to being electrically connected, it is necessary to electrically connect all the door-to-door systems. For these reasons, there is a problem that the equipment cost for system construction becomes high. Further, in the system of Patent Document 1, since the power consumption of each door is only suppressed so as not to exceed the allowable value of the main breaker, when the allowable value of the main breaker of each door is not set to a low value, The maximum power demand in the entire apartment cannot be controlled. On the other hand, if the allowable value of the main breaker of each house is set to a low value, simultaneous use of a plurality of electric devices is likely to be restricted, and convenience is reduced.

  The present invention was made to solve the above-described problems, and can suppress the entire power receiving facility or maximum demand power in a facility such as an apartment house where a plurality of hot water storage hot water heaters are installed. An object of the present invention is to provide a hot water storage type water heater that does not require a system construction in the entire facility and can be constructed at low cost.

  The hot water storage type hot water supply apparatus according to the present invention is a heating unit that heats water to generate hot water, a hot water storage tank that stores hot water, and a hot water storage operation that operates the heating unit to store hot water in a hot water storage tank. And a control unit capable of switching between a normal mode and a low-capacity mode in which the power consumption of the heating unit is lower than that in the normal mode, and an outside air temperature detection unit for detecting the outside air temperature. If the detected temperature is within the air conditioning non-use temperature range, the hot water storage operation is performed in the normal mode, and the detected temperature is outside the air conditioning non-use temperature range. In some cases, the hot water storage operation is performed in the low capacity mode.

  According to the present invention, it is possible to suppress the entire power receiving equipment or maximum demand power in a facility such as an apartment house where a plurality of hot water storage hot water heaters are installed, and it is not necessary to construct a system in the whole facility and is inexpensive. It can be configured.

It is a block diagram which shows the hot water storage type water heater of Embodiment 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the housing complex in which the hot water storage type water heater of Embodiment 1 of this invention is used by each house, the power distribution equipment of this whole housing complex, and the door-to-door system of each door of this housing complex. It is a figure which shows the relationship between external temperature, the power consumption of a heat pump unit (heating means), and the operation mode of hot water storage operation.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram illustrating a hot water storage type water heater according to Embodiment 1 of the present invention. A hot water storage type hot water heater 130 shown in FIG. 1 includes a heat pump unit 10, a tank unit 110, a tank unit control device 120 as a control means, and a heat pump unit control device 170 as a control means. Hereinafter, each component of the hot water storage type water heater 130 will be described.

  The heat pump unit 10 includes a compressor 1 that compresses refrigerant, a heat exchanger 3 for boiling, an expansion valve 5, an evaporator 7, and a refrigerant circulation pipe 9 that connects these in an annular shape in the unit case 2. And functions as a heating means for heating the water to generate hot water. In the above-described refrigeration cycle system, a refrigerant such as carbon dioxide is compressed by the compressor 1 to become high temperature and high pressure and then radiated by the boiling heat exchanger 3, depressurized by the expansion valve 5, and absorbed by the evaporator 7. As a result, it enters a gas state and is sucked into the compressor 1. When carbon dioxide is used as the refrigerant, it is preferable to operate on the high pressure side under conditions that exceed the critical pressure of carbon dioxide.

  The heat pump unit 10 is further provided with an outside air temperature sensor 173 as outside air temperature detecting means for detecting outside air temperature, and a watt-hour meter 171 for detecting power consumption of the heat pump unit 10. The compressor 1, the expansion valve 5, the watt-hour meter 171 and the outside air temperature sensor 173 are each electrically connected to the heat pump unit control device 170. The compressor 1 and the expansion valve 5 each operate based on an instruction value from the heat pump unit control device 170. The heat pump unit controller 170 and the tank unit controller 120 are electrically connected by a power communication line 172. The heat pump unit control device 170 is based on the boiling temperature instruction value and the power consumption instruction value from the tank unit control device 120, the detected value of the outside air temperature sensor 173, and the detected value of the watt hour meter 171. And the instruction value to the expansion valve 5 is determined.

  The tank unit 110 includes a hot water storage tank 20 for storing hot water, a water supply line 30, a hot water storage circulation line 40, a hot water supply line 50, a primary side circulation line 60, and a secondary side circulation line 70. And a reheating heat exchanger 80. The hot water storage tank 20 stores low-temperature water supplied from the water supply pipe 30 from the lower side, and stores hot water boiled by the heat pump unit 10 from the upper side. In the hot water storage tank 20, a temperature stratification is formed in which the upper side is hot and the lower side is low, and the hot water tank 20 is always kept in a full water state. In the lower part of the hot water storage tank 20, a water inlet 20 a to which the water supply pipe 30 is connected and a water outlet 20 b to which the forward pipe 40 a of the hot water circulation pipe 40 is connected are provided. In the upper part of the hot water storage tank 20, a hot water inlet 20 c to which the return pipe 40 b of the hot water storage circulation line 40 is connected and a hot water outlet 20 d to which the hot water supply pipe 50 is connected are provided.

  The hot water storage tank 20 is provided with a plurality of temperature detecting means arranged at different heights. In the first embodiment, four hot water storage temperature sensors 21a, 21b, 21c, and 21d are provided as the temperature detecting means. The mounting positions of the hot water storage temperature sensors 21a, 21b, 21c, and 21d are determined in advance as to the number of liters from the top of the hot water storage tank 20 (for example, 0 liter, 100 liters, 200 liters, and 300 liters). By detecting the temperature distribution in the hot water storage tank 20 with such hot water storage temperature sensors 21a, 21b, 21c, and 21d, the amount of hot water stored or the amount of heat storage in the hot water storage tank 20 can be calculated.

  The water supply pipe 30 is a pipe that supplies low-temperature water supplied from a water source such as a water supply to the hot water storage tank 20, the hot water supply pipe 50, and a predetermined hot water supply destination. The first water supply pipe section 30a and the second water supply pipe Part 30b, third water supply pipe part 30c and pressure reducing valve (not shown). The 1st water supply pipe part 30a connects water sources, such as a water supply, and the water inlet 20a of the hot water storage tank 20. FIG. The 2nd water supply pipe part 30b branches from the 1st water supply pipe part 30a, and is connected to the 1st mixing valve 45a and the 2nd mixing valve 45b which are mentioned later. The 3rd water supply pipe part 30c branches from the 1st water supply pipe part 30a, and is connected to the predetermined hot water supply destination (For example, faucets, such as a sink and a washstand, a shower, etc.). In the illustrated example, one hot water tap 160 is shown as a hot water supply destination. The pressure reducing valve is provided on the downstream side of the first water supply pipe part 30a with respect to the branch point of the third water supply pipe part 30c, and regulates the water source water pressure to be equal to or lower than a predetermined value. In FIG. 1, the flow direction of the low temperature water in the 1st water supply pipe part 30a is shown by the solid line arrow.

  The hot water storage circulation line 40 is a pipe line that reaches the hot water introduction port 20 c of the hot water storage tank 20 from the water outlet 20 b of the hot water storage tank 20 via the heating heat exchanger 3 in the heat pump unit 10. The hot water storage circulation line 40 includes an outward pipe 40a, a return pipe 40b, and a bypass pipe 40c. The forward pipe 40 a connects the water outlet 20 b and the water inlet of the boiling heat exchanger 3. A three-way valve 33 and a hot water storage water supply pump 35 are provided in this order in the middle of the forward pipe 40a. The return pipe 40b connects the hot water outlet of the boiling heat exchanger 3 and the hot water inlet 20c. The bypass pipe 40c branches from the forward pipe 40a via the three-way valve 33 and is connected in the middle of the return pipe 40b. During the freeze prevention operation, water flowing from the hot water storage tank 20 into the forward pipe 40a flows again into the forward pipe 40a through the heating heat exchanger 3, the return pipe 40b, and the bypass pipe 40c. When performing the hot water storage operation in which the hot water generated by heating water by the boiling heat exchanger 3 is sent to the hot water storage tank 20 and stored in the hot water storage tank 20 or the anti-freezing operation, the hot water storage water supply pump 35 is driven. Is done.

  The hot water supply pipe 50 mixes the hot water stored in the hot water storage tank 20 and the low-temperature water from the water supply pipe 30 with the first mixing valve 45a or the second mixing valve 45b, thereby setting a predetermined hot water supply temperature. It is a pipeline that supplies the hot water whose temperature is adjusted to the bathtub 150 or the hot-water tap 160. In addition to the first mixing valve 45a and the second mixing valve 45b, the hot water supply pipe line 50 includes a first hot water supply pipe part 50a, a second hot water supply pipe part 50b, and a third hot water supply pipe part 50c. The first hot water supply pipe section 50a connects the hot water outlet 20d of the hot water storage tank 20 to the first mixing valve 45a and the second mixing valve 45b. The second hot water supply pipe section 50 b connects the first mixing valve 45 a and the return pipe 70 b of the secondary side circulation pipe 70. The 3rd hot-water supply pipe part 50c connects the 2nd mixing valve 45b and the hot-water tap 160. In FIG. 1, the outflow direction of hot water from the hot water tap 160 is indicated by a broken arrow. The flow rate of hot water supplied to the hot-water tap 160 is transmitted to the control unit 120a of the tank unit control device 120 as a pulse output of the first flow rate sensor 46 provided in the third hot water supply pipe unit 50c. The controller 120a can calculate the amount of hot water supplied to the hot water tap 160 by integrating the flow rates. In addition, the flow rate of hot water supplied to the bathtub 150 is transmitted to the control unit 120a as a pulse output of the second flow rate sensor 47 provided in the second hot water supply pipe unit 50b. The controller 120a can calculate the amount of hot water supplied to the bathtub 150 by integrating the flow rates.

  The primary-side circulation pipe 60 is a pipe that reaches the lower part of the hot water storage tank 20 from the hot water outlet 20 d of the hot water storage tank 20 via the reheating heat exchanger 80. The primary side circulation pipe 60 has an outgoing pipe 60a and a return pipe 60b. The forward pipe 60 a connects the hot water outlet 20 d of the hot water storage tank 20 and the hot water inlet 80 a at the top of the reheating heat exchanger 80. The return pipe 60 b connects the hot water outlet 80 b at the lower part of the reheating heat exchanger 80 and the lower part of the hot water storage tank 20. A primary water pump 55 is provided in the middle of the return pipe 60b. In the illustrated example, a part of the first hot water supply pipe portion 50a on the hot water storage tank 20 side and a part of the forward pipe 60a on the hot water storage tank 20 side are combined.

  The secondary-side circulation pipeline 70 is a pipeline that returns from the bathtub 150 to the bathtub 150 again via the reheating heat exchanger 80. The secondary circulation pipe 70 has an outward pipe 70a and a return pipe 70b. The forward pipe 70a connects the bathtub 150 and the bath water inlet 80c at the bottom of the reheating heat exchanger 80. A secondary water pump 65 is provided in the middle of the forward pipe 70a. The return pipe 70 b connects the bath water outlet 80 d at the top of the reheating heat exchanger 80 and the bathtub 150. The reheating heat exchanger 80 exchanges heat between the hot water flowing through the primary-side circulation conduit 60 and the bath water 150a flowing through the secondary-side circulation conduit 70 to heat the bath water 150a.

  Among the components described above, each of the water supply pipe 30, the hot water storage circulation pipe 40, the hot water supply pipe 50, and the secondary side circulation pipe 70 is partially a unit case 112 of the tank unit 110. The remaining components are entirely contained in the unit case 112.

  The tank unit control device 120 includes a control unit 120a disposed in the unit case 112 and a remote controller 120b as a user interface device. The remote controller 120b is disposed in, for example, a kitchen or a bathroom. The remote controller 120b includes a remote controller display unit 120c. The control unit 120a and the remote controller 120b are connected to each other so that they can communicate with each other by wire or wirelessly. The control unit 120a includes a heat pump unit 10, a three-way valve 33, a hot water storage water pump 35, a first mixing valve 45a, a second mixing valve 45b, a primary water pump 55, a secondary water pump 65, a hot water temperature sensor 21a, 21b, 21c, 21d, the first flow sensor 46, and the second flow sensor 47 are electrically connected to each other. The controller 120a and the heat pump unit controller 170 can communicate with each other via a power communication line 172. The control unit 120a and the heat pump unit control device 170 control the operation of each actuator based on information, commands, etc. input by the user from the remote controller 120b and information detected by each sensor. The operation of the water heater 130 is controlled.

  FIG. 2 is a diagram illustrating an apartment house in which the hot water storage type water heater 130 according to the first embodiment is used in each door, a power distribution facility for the entire apartment house, and a door-to-door system for each door of the apartment house. In the apartment house 206 shown in FIG. 2, power is collectively received by a high-voltage power reception contract with a power supply company, and the received power is distributed to each house. In this apartment house 206, the door-to-door system 200 will be described with room 301 as an example. The door-to-door system 200 includes a main circuit breaker 201 connected to a distribution line 208, a room air conditioner 203 that is an air conditioner, the hot water storage hot water heater 130 according to the first embodiment described with reference to FIG. Is provided. The room air conditioner 203, the hot water storage type hot water heater 130, and the other electric devices 205 are connected to the main breaker 201 via the door-to-side electric wires 202. The other rooms have the same form as the room 301 and will not be described. The door-to-door system 200 of each house and the power distribution / distribution equipment 207 provided in the apartment house 206 are connected by a distribution line 208. The power distribution facility 207 is connected to the commercial power supply 211. The power distribution facility 207 receives, for example, AC 6600V power from the commercial power supply 211 and converts it into AC 200V or 100V voltage that can be used in the door-to-door system 200, and power consumed by all the houses in the apartment house 206. And a power reception meter 210 for measuring the amount. The basic electricity charge is determined based on the maximum value of the amount of electric power measured every demand time limit (here, 30 minutes) by the power reception meter 210. This basic electricity bill will continue for one year. Therefore, in order to suppress the basic electricity charge, it is necessary to suppress the maximum value of the amount of power measured every 30 minutes of the power reception meter 210. By the way, the amount of electric power for each use of the door-to-door system 200 is generally the largest in the total amount of electric power between the hot water storage hot water heater 130 and the room air conditioner 203, and is said to be 1/2 or more of the total electric energy of the door-to-door system 200. ing. Therefore, by suppressing the maximum value of the combined power amount of the hot water storage type hot water heater 130 and the room air conditioner 203, the maximum value of the power amount per 30 minutes consumed in all the houses of the apartment house 206 can be surely suppressed.

  FIG. 3 is a diagram showing the relationship between the outside air temperature, the power consumption of the heat pump unit 10 (heating means), and the operation mode of the hot water storage operation. Although there are individual differences and differences depending on the surrounding environment, it is generally said that heating is required when the outside air temperature falls below a specific temperature. This specific temperature is hereinafter referred to as “heating equipment use temperature”. In the first embodiment, it is assumed that the heating device operating temperature is 18 ° C. If the outside air temperature is lower than the heating device operating temperature, that is, lower than 18 ° C., it can be said that there is a high possibility that the room air conditioner 203 performs the heating operation because there are many people who need heating. In addition, although there are individual differences and differences depending on the surrounding environment, it is generally said that cooling is required when the outside air temperature exceeds a specific temperature. This specific temperature is hereinafter referred to as “cooling equipment use temperature”. In the first embodiment, it is assumed that the cooling device use temperature is 28 ° C. If the outside air temperature is equal to or higher than the cooling device operating temperature, that is, 28 ° C. or higher, it can be said that there is a high possibility that the room air conditioner 203 performs the cooling operation because there are many people who require cooling. From the above, in the first embodiment, the range where the outside air temperature is from 18 ° C. to 28 ° C. is set as an air conditioning non-use temperature range where the air conditioning equipment is not used. When the outside air temperature is within the air conditioning non-use temperature range, it can be estimated that the room air conditioner 203 is likely to be non-operating. On the other hand, when the outside air temperature is outside the cooling / heating non-use temperature range, it can be estimated that the room air conditioner 203 is highly likely to perform the heating operation or the cooling operation.

  The hot water storage type water heater 130 according to the first embodiment has a normal mode in which the power consumption of the heat pump unit 10 is set to a normal value when performing a hot water storage operation in which hot water is generated by the heat pump unit 10 and stored in the hot water storage tank 20. The low-capacity mode that lowers the power consumption of the heat pump unit 10 compared to the normal mode can be switched. In general, the refrigeration cycle system such as the heat pump unit 10 has a property that the heating capacity and the power consumption are in a proportional relationship, and the power consumption decreases when the heating capacity decreases. For this reason, the power consumption of the heat pump unit 10 can be accurately controlled by controlling the heating capacity of the heat pump unit 10 to be changed by the tank unit control device 120 and the heat pump unit control device 170.

  The heating capacity of the heat pump unit 10 in the hot water storage operation in the normal mode is set in advance based on the capacity of the hot water storage tank 20, the boiling temperature in the heat pump unit 10, the duration of the hot water storage operation, and the like. For example, when the capacity of the hot water storage tank 20 is 370 L, 6 ° C. water is boiled to 90 ° C. by the heat pump unit 10 and the hot water storage operation is completed in 8 hours, the required heating capacity is 4.5 kW.

  The heating capacity of the heat pump unit 10 in the low-capacity mode hot water storage operation is a predetermined ratio and a low value (for example, a value of about 1/2) compared to the heating capacity of the heat pump unit 10 in the normal mode described above. For example, when the heating capacity of the heat pump unit 10 in the hot water storage operation in the normal mode is 4.5 kW as described above, about ½ of 2.2 kW is set as the heating capacity of the heat pump unit 10 in the low capacity mode. As described above, since the heating capacity and power consumption are proportional, the power consumption of the heat pump unit 10 in the low capacity mode is lower than the power consumption of the heat pump unit 10 in the normal mode at the same rate as the heating capacity. Become.

  Based on the start instruction of the hot water storage operation from the tank unit control device 120, the heat pump unit control device 170 starts the hot water storage operation. As shown in FIG. 3, the heat pump unit control device 170 detects the outside air when the temperature detected by the outside air temperature sensor 173 is equal to or higher than the heating equipment use temperature (18 ° C. or more) and less than the cooling equipment use temperature (less than 28 ° C.). It is determined that the temperature is within the air conditioning non-use temperature range, and hot water storage operation is performed in the normal mode. On the other hand, when the temperature detected by the outside air temperature sensor 173 is less than the heating equipment use temperature (less than 18 ° C.) or the cooling equipment use temperature (28 ° C. or more), the heat pump unit control device 170 has the outside air temperature. It is judged that the temperature is outside the non-heating / heating temperature range, and hot water storage operation is performed in a low capacity mode with low power consumption.

  As described above, when the outside air temperature is outside the cooling / heating non-use temperature range (18 ° C. to 28 ° C.), it is estimated that the room air conditioner 203 is likely to perform the heating operation or the cooling operation. In this case, the hot water storage type hot water heater 130 performs the hot water storage operation in the low capacity mode with low power consumption, so that the maximum value of the combined electric energy between the hot water storage type hot water heater 130 and the room air conditioner 203 can be reliably suppressed. . On the other hand, when the outside air temperature is within the air conditioning non-use temperature range (18 ° C. to 28 ° C.), it is estimated that there is a high possibility that the room air conditioner 203 is not in operation. In this case, the hot water storage type hot water heater 130 performs hot water storage operation in the normal mode in which power consumption is larger than that in the low capacity mode, but the room air conditioner 203 is highly likely to be non-operating. It is possible to suppress the maximum value of the total amount of power between the room air conditioner 203 with a high probability. In this case, the hot water storage type water heater 130 performs the hot water storage operation in the normal mode, so that the hot water storage operation can be completed earlier than in the low capacity mode.

  As described above, according to the first embodiment, the maximum value of the combined electric energy of the hot water storage hot water heater 130 and the room air conditioner 203, which is said to occupy 1/2 or more of the total electric energy of the door-to-door system 200. Can be reliably suppressed. For this reason, the maximum value of the electric energy for every 30 minutes consumed in all the houses of the apartment house 206 can be suppressed reliably. As a result, since the maximum demand power in the entire apartment house 206 can be reliably suppressed, the contract power with the power supplier and the basic charge can be reduced, and the electricity charge can be reduced. Moreover, since the capacity | capacitance of the power distribution equipment 207 of the apartment house 206 can be suppressed, the cost required for the power distribution equipment 207 can be suppressed.

  In addition, since there are individual differences in how the outside air temperature is felt, the room air conditioner 203 may perform a heating operation or a cooling operation depending on the room number even when the outside air temperature is in the temperature / non-heating temperature range. In the first embodiment, when the room air conditioner 203 performs the heating operation or the cooling operation when the outside air temperature is in the air conditioning non-use temperature range, the total electric energy of the hot water storage hot water heater 130 and the room air conditioner 203 is used. Can not be suppressed. However, when viewed as the entire apartment house 206, when the outside air temperature is within the cooling and heating non-use temperature range, it can be estimated that among all the houses in the apartment house 206, there are a number of the number rooms where the room air conditioner 203 is not operated. For this reason, when it sees as the housing complex 206 whole, the value which totaled the total electric energy of the hot water storage type water heater 130 and the room air conditioner 203 can be suppressed reliably. Therefore, the maximum demand power in the entire apartment house 206 can be reliably suppressed, and the above effect can be obtained. In addition, as the number of apartment houses 206 increases, the relationship between the outside air temperature and the presence / absence of operation of the room air conditioner 203 of each house is probabilistically averaged. For this reason, the effect mentioned above can be exhibited more reliably.

  Moreover, in this Embodiment 1, in the door to door system 200, it is not necessary to connect the control part of the room air conditioner 203 and the control means of the hot water storage type hot water heater 130 so that communication is possible. Further, it is not necessary to connect all the door-to-door systems 200 so that they can communicate with each other. For this reason, it is not necessary to construct a system in the entire apartment house 206, and it can be configured at low cost.

  Moreover, according to this Embodiment 1, even if the allowable value of the main breaker 201 of the door-to-door system 200 is not set to a low value, the maximum demand power in the entire apartment house 206 can be reliably suppressed. Further, according to the first embodiment, since it is not necessary to set the allowable value of the main breaker 201 of the door-to-door system 200 to a low value, it is difficult to be restricted from the simultaneous use of a plurality of electric devices in each door of the apartment house 206. Can improve convenience. Further, according to the first embodiment, the power consumption of the room air conditioner 203 is not forcibly suppressed at the time of hot water storage operation of the hot water storage type water heater 130 in each unit of the apartment house 206. However, there is no limitation, and convenience is improved.

  During execution of the hot water storage operation, the detected value of the outside air temperature sensor 173 is updated periodically, for example, at intervals of 10 seconds. When the hot pump operation is performed in the normal mode, the heat pump unit control device 170 is in the low-capacity mode when the detected temperature of the outside air temperature sensor 173 shifts from the inside of the air conditioning non-use temperature range to the outside of the air conditioning non-use temperature range. Control to switch to hot water storage operation. Further, when the heat pump unit control device 170 performs the hot water storage operation in the low capacity mode, when the detected temperature of the outside air temperature sensor 173 shifts from outside the air conditioning non-use temperature range to inside the air conditioning non-use temperature range, Control to switch to hot water storage operation in mode.

  During hot water storage operation in the normal mode or the low capacity mode, when the outside air temperature is in the vicinity of 18 ° C. which is the heating device use temperature, for example, 17.5 ° C. or 18.5 ° C., or the cooling device use temperature is 28 ° C. When the temperature is in the vicinity of 27.5 ° C. or 28.5 ° C., for example, there is a possibility of frequent switching from the normal mode to the low-capacity mode or from the low-capacity mode to the normal mode as the outside air temperature fluctuates. is there. In order to reduce the frequency of switching between the normal mode and the low-capacity mode accompanying such a change in the outside air temperature, the following control may be performed.

  For example, when the outside air temperature is 17.5 ° C. and the outside air temperature rises during the hot water storage operation in the low-capacity mode and becomes 18 ° C. or more, which is the heating device operating temperature, for example, 18.5 ° C. Does not switch to normal mode. Thereafter, when the outside air temperature further rises and becomes equal to or higher than the temperature obtained by adding 1 ° C. to the heater operating temperature, that is, 19 ° C. or higher, the mode is switched to the normal mode.

  Similarly, for example, when the outside air temperature is 28.5 ° C. and the outside air temperature decreases during the hot water storage operation in the low capacity mode and becomes less than 28 ° C., which is the cooling device use temperature, for example, 27.5 ° C. When it becomes, switching to the normal mode is not performed. Thereafter, when the outside air temperature further decreases and becomes less than the temperature obtained by subtracting 1 ° C. from the cooling device use temperature, that is, less than 27 ° C., the mode is switched to the normal mode.

  Similarly, for example, when the outside air temperature is 18.5 ° C. and the outside air temperature decreases during the hot water storage operation in the normal mode and becomes less than 18 ° C., which is the heater operating temperature, it becomes 17.5 ° C., for example. If it does, switching to the low ability mode is not performed. Thereafter, when the outside air temperature further decreases and becomes less than the temperature obtained by subtracting 1 ° C. from the heating equipment use temperature, that is, less than 17 ° C., the mode is switched to the low capacity mode.

  Similarly, for example, when the outside air temperature is 27.5 ° C. and the outside air temperature rises during the hot water storage operation in the normal mode and becomes 28 ° C. or more, which is the cooling device use temperature, it becomes 28.5 ° C., for example. If it does, switching to the low ability mode is not performed. Thereafter, when the outside air temperature further rises and becomes equal to or higher than the temperature obtained by adding 1 ° C. to the cooling device use temperature, that is, 29 ° C. or higher, the low-capacity mode is switched.

  As described above, during hot water storage operation in the low capacity mode, a temperature (19 ° C.) obtained by adding a predetermined temperature (1 ° C.) to the heating device use temperature and a temperature obtained by subtracting the predetermined temperature (1 ° C.) from the cooling device use temperature (27 ° C) is regarded as the boundary temperature of the air conditioning non-use temperature range, and during the hot water storage operation in the normal mode, the temperature (17 ° C) obtained by subtracting the predetermined temperature (1 ° C) from the heating equipment use temperature and the cooling equipment use temperature By controlling the temperature (29 ° C), which is the sum of the predetermined temperature (1 ° C), as the boundary temperature of the air conditioning / non-use temperature range, the frequency of switching between the normal mode and the low-capacity mode associated with fluctuations in the outside air temperature can be controlled. Can be reduced.

  In the first embodiment, when the hot water storage operation is performed in the low capacity mode, the heat pump unit control device 170 indicates that the detection value of the watt hour meter 171 (power consumption every 30 minutes, for example). The operation of the heat pump unit 10 may be controlled so as to be equal to or less than a preset allowable value. The allowable value is set to be lower than the amount of power in the normal mode hot water storage operation. In this way, when performing the hot water storage operation in the low capacity mode, the operation of the heat pump unit 10 is controlled based on the detection value of the watt hour meter 171, so that the sum of the hot water storage type water heater 130 and the room air conditioner 203 is added. The maximum value of electric energy can be suppressed more reliably. For this reason, the maximum demand power in the whole apartment 206 can be suppressed more reliably.

  Moreover, in this Embodiment 1, you may make it alert | report to a user whether it is drive | operating by normal mode or low capacity mode during hot water storage driving | operation. As the notification means in this case, for example, the current hot water storage operation mode is set to the normal mode and the low capacity mode from the heat pump unit control device 170 via the power communication line 172 and the control unit 120a of the tank unit control device 120. It can be displayed on the remote controller display unit 120c.

DESCRIPTION OF SYMBOLS 1 Compressor, 2 Unit case, 3 Heat exchanger for boiling, 5 Expansion valve, 7 Evaporator, 9 Refrigerant circulation piping, 10 Heat pump unit, 20 Hot water storage tank, 20a Water inlet, 20b Water outlet, 20c Hot water introduction Port, 20d hot water outlet, 21a, 21b, 21c, 21d hot water storage temperature sensor, 30 water supply pipe, 30a first water supply pipe part, 30b second water supply pipe part, 30c third water supply pipe part, 33 three-way valve, 35 hot water storage Water supply pump, 40 Hot water circulation pipe, 40a Outward pipe, 40b Return pipe, 40c Bypass pipe, 45a First mixing valve, 45b Second mixing valve, 46 First flow sensor, 47 Second flow sensor, 50 Hot water supply pipe 50a 1st hot water supply pipe part, 50b 2nd hot water supply pipe part, 50c 3rd hot water supply pipe part, 55 Primary side water supply pump, 60 Primary side circulation pipe line, 60a Outward pipe 60b Return pipe, 65 Secondary side water supply pump, 70 Secondary side circulation line, 70a Outward pipe, 70b Return pipe, 80 Heat exchanger for reheating, 80a Hot water inlet, 80b Hot water outlet, 80c Bath water inlet 80d bath water outlet, 110 tank unit, 112 unit case, 120 tank unit control device, 120a control unit, 120b remote controller, 120c remote controller display unit, 130 hot water storage hot water heater, 150 bathtub, 150a bath water, 160 hot water supply Plug, 170 Heat pump unit controller, 171 Energy meter, 172 Power communication line, 173 Outside air temperature sensor, 200 door-to-door system, 201 trunk breaker, 202 door-to-door cable, 203 room air conditioner, 205 other electrical equipment, 206 apartment house, 207 Power distribution facilities, 208 Distribution line, 209 Power distribution device, 210 Power meter, 211 Commercial power supply

Claims (3)

Heating means for heating the water to produce hot water;
A hot water storage tank for storing hot water,
Control means capable of switching between a normal mode and a low-capacity mode in which the power consumption of the heating means is lower than that in the normal mode when performing the hot water storage operation in which the heating means is operated to store hot water in the hot water storage tank. ,
Outside temperature detecting means for detecting outside temperature;
With
The control means compares the detected temperature of the outside air temperature detecting means with a preset air conditioning non-use temperature range, and when the detected temperature is in the air conditioning non-use temperature range, the normal mode A hot water storage type water heater that performs a hot water storage operation and performs the hot water storage operation in the low-capacity mode when the detected temperature is outside the air conditioning non-use temperature range. A watt-hour meter for detecting power consumption of the heating means;
The said control means controls operation | movement of the said heating means so that the detection value of the said watt-hour meter may become below a preset value, when performing the said hot water storage operation in the said low capacity mode. Hot water storage water heater.   The hot water storage type hot water supply apparatus according to claim 1 or 2, further comprising an informing means for informing a user whether the normal mode or the low capacity mode is being operated during the hot water storage operation.

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