JP6036016B2 - Heat pump hot water supply system - Google Patents

Description

  The present invention relates to a heat pump hot water supply system, and more particularly to a heat pump hot water supply system provided with a solar power generation device.

  Conventionally, a heat pump hot water supply device (so-called hybrid heat pump) having a heat pump heat source device, a hot water storage tank, and a combustion type auxiliary heat source device, and a solar cell power generation device having a plurality of solar cell panels that generate power using sunlight A heat pump hot water supply system equipped with a power measuring device for measuring power generated by the solar power generator and power used in the home has been put into practical use.

  This type of heat pump hot water supply system is generally configured so that the power measurement device and the heat pump hot water supply device are connected in communication and the heat pump hot water supply device can receive power generation state data. The operation of the heat pump water heater can be appropriately controlled according to the power generation state. The control method of the heat pump hot water supply apparatus of such a heat pump hot water supply system is disclosed in various documents.

  For example, in the heat pump hot water supply system of Patent Document 1, a heat pump heat source device, a hot water storage tank, a solar power generation device, and AC power of a commercial power system is converted into DC power and stored, and the stored DC power is stored. A power storage device that converts to AC power and supplies power, and predicts in advance the amount of power required for the next day operation of the heat pump heat source unit and the amount of power generated by the solar power generation device, and the surplus amount of power generation from this predicted value The operation of the power storage device and the heat pump heat source is controlled according to the presence or absence of this surplus.

JP 2011-69587 A

  By the way, a heat pump type heat source machine requires a considerably large amount of electric power as compared with electric power used other than the heat pump type heat source machine in the home (total amount of electric power consumed by electric devices such as a television, a washing machine, and a refrigerator). At present, the unit price of power sales is set to approximately twice the unit price of power purchase (for example, the unit price of power purchase is 21 yen and the unit price of power sale is 42 yen). If consumed by a heat pump heat source machine, the cost may increase, and there is a problem that the merit of installing the solar power generation apparatus cannot be utilized.

  In patent document 1, although it is the structure which supplies the surplus of the electric power generated with the solar power generation device to the heat pump type heat source machine, when there is no allowance for the power generation amount of the next day by the solar power generation device, the inexpensive night power Is stored in advance in the power storage device, and the stored power is used to drive a heat pump heat source unit during the day as needed. However, since the power storage device is generally expensive, the facility cost of the entire heat pump hot water supply system becomes high, and there is a possibility that the merit of employing the heat pump hot water supply system may be lost.

  The objective of this invention is providing the heat pump hot-water supply system which can reduce the operating cost of a heat pump hot-water supply apparatus, etc.

The heat pump hot water supply system according to claim 1 includes a heat pump hot water supply device having a heat pump heat source device, a hot water storage tank, and a combustion type auxiliary heat source device, and a power measurement device that measures the amount of power generated by the solar power generation device and the electric power used in the home. In the heat pump hot water supply system in which the heat pump hot water supply device can receive power generation state data by communicatively connecting the power measuring device and the heat pump hot water supply device, the power generated by the solar power generation device is The ratio of the electric power supplied from the solar power generation device to the electric power used by the heat pump heat source unit when the electric power used in the home is exceeded is the operating cost of the heat pump type heat source unit and the operating cost of the auxiliary heat source unit if it exceeds the set value that is determined based on the hot water supply operation by the heat pump heat source unit It is characterized by comprising a control unit for stopping or limiting.

  A heat pump hot water supply system according to a second aspect of the present invention is the heat pump hot water supply system according to the first aspect, wherein the control unit turns off the auxiliary heat source device when there is a hot water supply request in a state where the operation of the heat pump heat source device is prohibited or restricted. It is characterized by driving and performing hot water supply operation.

According to invention of Claim 1, the ratio of the electric power supplied from the solar power generation device when the electric power generated by the solar power generation device exceeds the electric power used in the home and occupies the electric power used by the heat pump heat source device If it exceeds the set value determined based on the operating cost of the heat pump heat source machine and the operating cost of the auxiliary heat source machine, because it has a control unit that prohibits or restricts hot water supply operation by the heat pump heat source machine, The power consumption of the heat pump heat source machine can be reduced to increase the amount of power sold, and hence the operating cost can be reduced. And when the generated electric power of a solar power generation device is low, the operation | movement of a heat pump type heat source machine can be continued, without prohibiting or restricting the hot water supply operation by a heat pump type heat source machine.
In addition, the operation cost can be reduced without the need to newly install a device having a power storage function such as an expensive power storage device.

  According to the invention of claim 2, the control unit drives the auxiliary heat source device to perform the hot water supply operation when there is a hot water supply request in a state where the operation of the heat pump heat source device is prohibited or restricted. Hot water can be supplied while maintaining the power selling state of the hot water supply system, and the convenience for the user is not impaired.

1 is a schematic configuration diagram of a heat pump hot water supply system according to Embodiment 1. FIG. It is a flowchart of the operation prohibition control of a heat pump hot-water supply apparatus. It is a graph which shows the change of the electric power sales electric power by the operation mode of a heat pump type heat source machine. It is a diagram which shows the relationship between the ratio of the solar power generation electric power which occupies for the electric power used of a heat pump type heat source machine, and the operating cost of a heat pump type heat source machine and an auxiliary heat source machine. It is a flowchart of the output limitation control of the heat pump hot-water supply apparatus which concerns on Example 2. FIG.

  Hereinafter, modes for carrying out the present invention will be described based on examples.

First, the overall structure of the heat pump hot water supply system S will be briefly described.
As shown in FIG. 1, the heat pump hot water supply system S includes a heat pump hot water supply apparatus 1 including a hot water storage tank unit 2 and a heat pump heat source unit 3, a solar power generation apparatus 40 that generates power using sunlight, A power measuring device 45 that measures the power generated by the power generating device 40 and the power used in the home, and the power measuring device 45 and the heat pump hot water supply device 1 are connected by communication so that the heat pump hot water supply device 1 receives the power generation state data. Is configured to be possible.

Next, the heat pump hot water supply apparatus 1 will be described.
As shown in FIG. 1, a heat pump hot water supply apparatus 1 includes a hot water storage tank unit 2 having a large capacity hot water storage tank 12 for storing hot water and an auxiliary heat source unit 13, a heat pump heat source unit 3 having a heat pump circuit, and a hot water storage tank unit. 2 and a heat pump type heat source unit 3 for circulating hot water between the heat pump type heat source device 3 and supplying hot water in the hot water storage tank 12 for a small amount of hot water supply in the kitchen, etc. In this case, hot water is supplied by driving the heat pump type heat source unit 3 or the auxiliary heat source unit 13.

Next, the hot water storage tank unit 2 will be described.
As shown in FIG. 1, a hot water storage tank unit 2 includes a hot water storage tank 12 having a vertically long cylindrical outer peripheral surface, various pipes 6, 7, 8, 9, and 10, a main control unit 11, an auxiliary heat source unit 13, and an exterior case. 14 and so on. The hot water storage tank 12 stores high-temperature hot water heated by the heat pump heat source unit 3, and is made of a stainless steel plate material having excellent corrosion resistance.

  A lower pipe 8 connected to a water supply pipe 7 such as a water pipe and an upstream pipe 9 a of a hot water circulation pipe 9 is connected to the lower end of the hot water storage tank 12. The water supply pipe 7 is provided with an open / close valve 15 for supplying tap water to the hot water storage tank 12. Normally, the open / close valve 15 is opened so that tap water is supplied into the hot water storage tank 12. It has become.

  The hot water circulation pipe 9 has an upstream pipe 9a and a downstream pipe 9b, and hot water (reserved water) passes from the hot water storage tank 12 through the liquid feed pump 16 through the lower pipe 8 and the upstream pipe 9a. It is sent to the heat source unit 3. The hot water heated by the hot water heating heat exchanger 21 of the heat pump heat source unit 3 flows to the downstream pipe 9b.

  An upper pipe 10 connected to the downstream side pipe 9 b and the hot water discharge pipe 6 is connected to the upper end of the hot water storage tank 12. The upper pipe 10 is provided with an on-off valve 17. Normally, the on-off valve 17 is opened, and hot hot water (for example, 80 to 90 ° C.) returned from the downstream pipe 9 b through the upper pipe 10 can be stored in the hot water storage tank 12. Sometimes hot hot water in the hot water storage tank 12 can be supplied to the upper pipe 10.

  The outer surface side of the hot water storage tank 12 is covered with a heat insulating material 12a made of a foam heat insulating material obtained by foaming a resin such as foamed polypropylene or foamed polystyrene. In the hot water storage tank 12, a plurality of temperature sensors 31 to 34 are arranged at predetermined intervals in the height direction. The temperature sensors 31 to 34 are connected to the main control unit 11, and temperature detection signals from the temperature sensors 31 to 34 are supplied to the main control unit 11.

  The hot water supply pipe 6 has an upstream pipe 6a through which high-temperature hot water flows and a downstream pipe 6b through which mixed hot water mixed with water and high-temperature hot water flows. The downstream end of the upstream pipe 6 a is connected to the mixing valve 27, the upstream end of the downstream pipe 6 b is connected to the mixing valve 27, and the branch pipe 7 a that branches from the middle of the water supply pipe 7 is connected to the mixing valve 27. ing. An auxiliary heat source unit 13 is installed in the middle of the downstream pipe 6b of the tap water pipe 6. A hot-water tap 4 is connected to the downstream end of the downstream pipe 6b.

  The auxiliary heat source unit 13 is a gas water heater that uses city gas as a fuel. The auxiliary heat source unit 13 is generated from a combustion unit 13a composed of a gas burner, a blower 13b for supplying combustion air to the combustion unit 13a, and the combustion unit 13a. A heat exchanger 13c that reheats water with combustion heat to generate hot water is provided, and gas is supplied to the combustion unit 13a through a gas pipe extending from the outside. A bypass pipe 36 that bypasses the downstream pipe 6b that passes through the auxiliary heat source unit 13 is provided, and the downstream pipe 6b and the bypass pipe 36 can be switched selectively by a switching valve 37.

  The outer case 14 is formed in a box shape made of a thin steel plate, and includes a main control unit 11, a hot water storage tank 12, pipes 6, 7, 8, 10, most of the hot water circulation pipe 9, an auxiliary heat source machine 13, a liquid feed A pump 16, on-off valves 15 and 17, a mixing valve 27, a plurality of temperature sensors 28 to 30 and the like are accommodated.

Next, the heat pump heat source machine 3 will be described.
As shown in FIG. 1, the heat pump heat source unit 3 includes an outside air heat absorption heat exchanger 18 as an evaporator, a compressor 20, a hot water heating heat exchanger 21 as a condenser, and a high-pressure refrigerant. An expansion valve 22 that rapidly expands and reduces temperature and pressure, and these devices 18, 20, 21, and 22 are connected via a refrigerant pipe 23 to form a heat pump circuit, and the refrigerant accommodated in the refrigerant pipe 23 Use hot water heating operation.

  The heat pump heat source unit 3 further includes an evaporator blower fan 19 driven by a blower motor 19a, an auxiliary control unit 24 connected to the main control unit 11 and controlling the heat pump heat source unit 3, and an exterior housing these components. A case 25 is provided.

  The outside air heat absorption heat exchanger 18 includes an evaporator passage portion 18a included in the refrigerant pipe 23. The evaporator passage portion 18a includes a plurality of fins. In the outside air heat absorption heat exchanger 18, Heat is exchanged between the refrigerant flowing through the evaporator passage portion 18a and the outside air, and the refrigerant absorbs heat from the outside air and vaporizes. The compressor 20 is a known hermetic compressor that adiabatically compresses a refrigerant in a gas phase state to increase the temperature.

  The hot water heating heat exchanger 21 has a heat exchanger passage portion 21a and an internal passage 21b which is a part of the refrigerant pipe 23. The internal passage 21b is formed of a copper tube having a pressure resistance of 16 MPa or more, for example. Yes. In this hot water heating heat exchanger 21, heat is exchanged between the refrigerant flowing in the internal passage 21b and hot water supplied from the upstream pipe 9a to the heat exchanger passage 21a, and the hot water is heated and the refrigerant is cooled and liquefied. To do.

  The expansion valve 22 adiabatically expands the refrigerant in the liquid phase to lower the temperature. The expansion valve 22 is a control valve having a variable throttle amount. Instead of the expansion valve 22, an expansion valve having a constant throttle amount may be employed.

  In the heat pump heat source unit 3, the heated refrigerant compressed to a high pressure by the compressor 20 is sent to the hot water heating heat exchanger 21 and driven from the lower end of the hot water storage tank 12 to the lower pipe 8 by driving the liquid feed pump 16. And hot water or water flowing into the heat exchanger passage 21a via the upstream pipe 9a to heat the warm water or water, and the heated hot water passes through the downstream pipe 9b and the upper pipe 10 to store the hot water storage tank unit. The hot water is stored in the hot water storage tank 12, and high temperature hot water is stored in the hot water storage tank 12 by repeating the heating operation via the heat pump heat source unit 3.

Next, the main control unit 11 will be described.
The main control unit 11 (corresponding to the control unit) is connected to various devices such as an operation remote controller 35 that can be operated by a user, a power measuring device 45 that measures various powers, and an auxiliary control unit 24 via a communication interface. It is configured to be capable of data communication with the operation remote controller 35, the power measuring device 45, and the auxiliary control unit 24.

  When the user performs a hot water supply operation, the hot water stored in the hot water storage tank 12 flows into the hot water supply pipe 6, and the hot water and tap water supplied from the water supply pipe 7 are mixed by the mixing valve 27, and a predetermined temperature is set. Then, hot water is supplied to the hot water tap 4 such as a faucet. Temperature sensors 28 to 30 for detecting the hot water temperature or the incoming water temperature are respectively provided in the upstream portion, the downstream portion of the mixing valve 27 and the middle portion of the water supply pipe 7, and detection signals of these temperature sensors 28 to 30 are provided. Is supplied to the main control unit 11. The main control unit 11 adjusts the temperature of the hot water to be supplied by controlling the mixing valve 27 and adjusting the mixing ratio of the hot water and water based on the temperature detection data detected by these temperature sensors 28-30. Hot water.

  Moreover, when the temperature of the hot water is insufficient, the main control unit 11 can drive the auxiliary heat source unit 13 to reheat the hot water or heat the tap water to supply hot water. Further, during the hot water supply heating operation, the main control unit 11 determines the heating temperature for heating the hot water by the heat pump heat source unit 3 based on the target hot water supply temperature data and the temperature detection data from the temperature sensors 31 to 34, and performs auxiliary control. Instruct unit 24 of the heating temperature.

  The auxiliary control unit 24 is capable of data communication with the main control unit 11, and controls the drive of various devices (such as the blower motor 19 a and the compressor 20) of the heat pump heat source unit 3 in accordance with instructions from the main control unit 11. Do. In the outlet side portion of the heat exchanger 21 for heating hot water, the downstream pipe 9b is provided with a temperature sensor 26 for detecting the temperature of the hot water, the detection signal is supplied to the main control unit 11, and the auxiliary control unit 24 is The heat pump type heat source unit 3 is operated so that the command temperature and the temperature detection data are received from the main control unit 11 and the heating temperature of the hot water becomes the commanded temperature.

Next, the operation remote controller 35 will be described.
As shown in FIG. 1, the operation remote controller 35 includes a microcomputer (not shown), a display unit 35 a that can visually recognize various information such as operation status and operation status of the heat pump hot water supply device 1, remote operation and operation remote control of the heat pump hot water supply device 1. A plurality of switches 35b, etc., capable of various setting operations for 35 are provided.

  The display unit 35a of the operation remote controller 35 displays the usage amount of city gas and tap water calculated from various sensors, as well as the power purchased from the power company transmitted from the power measuring device 40 and sold to the power company. It also displays the amount of power used and the total amount of power used in the home. When the target hot water temperature is set by the switch operation, the target hot water temperature data is transmitted from the operation remote controller 35 to the main control unit 11.

Next, the solar power generation device 40 will be described.
As shown in FIG. 1, the solar power generation device 40 has a plurality of solar battery panels 41, a power conditioner (not shown), etc., and is installed on an installation surface such as a roof via a gantry. The power generated through the power distribution board 43 is transmitted to the distribution board 43. The plurality of solar cell panels 41 are arranged in a matrix of a plurality of rows and a plurality of columns, for example. The solar cell panel 41 is of a general structure having a rectangular panel main body capable of receiving light and generating electric power, and a frame frame provided on the outer peripheral portion of the panel main body for fixing the panel main body. . In addition, the shape and number of the solar cell panels 41 do not need to be limited to those described above, and can be appropriately changed.

Next, the power measuring device 45 will be described.
As shown in FIG. 1, the power measuring device 45 is provided in the distribution board 43 corresponding to the two-system linkage of the commercial power source and the solar power generation device 40 or in the vicinity of the distribution board 43. That is, the power measuring device 45 measures a power meter that measures the generated power of the solar power generation device 40, a power meter that measures power used in the home, power purchased from the power company, and power sold to the power company. It consists of a wattmeter and the like.

  The power measuring device 45 is communicatively connected to the heat pump water heater 1 via the signal line 46 and can transmit power generation state data and various types of power data to the main control unit 11 of the heat pump water heater 1.

  Next, the operation prohibition control of the heat pump heat source unit 3 performed by the main control unit 11 in a state where the solar power generation device 40 is generating power will be described based on the flowchart of FIG. In the figure, the symbol Si (i = 1, 2,...) Indicates each step. A control program for operation prohibition control of the heat pump heat source device 3 is stored in advance in a storage unit (for example, ROM) of a computer of the main control unit 11.

  In the flowchart of FIG. 2, when this control is started, first, at S1, the main control unit 11 receives the power generation state data transmitted from the power measuring device 45, and the main control unit 11 receives sunlight. It is determined whether or not the power generation device 40 is generating power. If the determination in S1 is Yes, the process proceeds to S2. If the determination is No, the operation prohibition control of the heat pump heat source unit 3 is not performed.

  Next, in S2, the main control unit 11 receives various types of power data transmitted from the power measuring device 45, and whether or not the generated power of the solar power generation device 40 exceeds the power used in the home. When the determination of S2 is Yes, the process proceeds to S3, and when No, the operation prohibition control of the heat pump heat source unit 3 is not performed and the process is terminated.

  That is, in S2, more specifically, when the total amount of power used in the home when the heat pump heat source unit 3 is stopped is 0.5 kW (see FIG. 3), the power generated by the solar power generation device 40 is 0. If it exceeds 5 kW, surplus power is generated in the generated power, so the heat pump hot water supply system S is in a power selling state.

  For example, if the power consumption in the rated operation state of the heat pump heat source device 3 is 1.0 kW, the power consumption in the home is 1.5 kW (see FIG. 3) in the operation state of the heat pump heat source device 3, If the power generated by the solar power generation device 40 is 1.5 kW or less, the surplus power cannot be secured, and the heat pump hot water supply system S cannot be sold.

  Next, in S3, it is determined whether or not the ratio of the photovoltaic power generation to the electric power used by the heat pump heat source unit 3 in rated operation is equal to or higher than a set value (for example, 40%). When the ratio is equal to or greater than the set value (when the predetermined condition of the present invention is satisfied), that is, when the power generated by the solar power generation device 40 is large, the determination in S3 is Yes and the process proceeds to S4. When the determination of S3 is No, the operation is terminated without performing the operation prohibition control of the heat pump heat source unit 3 as described later.

  S3 will be described in detail below. The operation cost when the ratio of the photovoltaic power generation power to the power consumption of the heat pump heat source device 3 in the rated operation state is 100% (power sales power 100%) is 1 kWh. It is set at around 15 yen per hit. The operation cost when the ratio of the photovoltaic power generation to the electric power used by the heat pump heat source unit 3 is 0% (100% of purchased power) is set to about 7 yen per 1 kWh. Generally, since the power selling price is higher than the power purchase price, it is more costly to consume generated power that can be sold. Note that the operation cost of the auxiliary heat source unit 13 is set to about 10 yen per 1 kWh calculated from the price of the city gas regardless of the ratio of the photovoltaic power generation.

  As shown in FIG. 4, the operating cost of the heat pump heat source device 3 varies according to the ratio of the photovoltaic power generation to the electric power used. When the relationship between the generated power and the household power consumption is in the state of FIG. 3A, that is, the ratio of the photovoltaic power generation power to the power consumption of the heat pump heat source unit 3 in the rated operation state is 100%. As shown in FIG. 4, the operating cost of the heat pump heat source unit 3 is 15 yen per 1 kWh, which exceeds the operating cost of 10 yen when using the auxiliary heat source unit 13, so if there is a hot water supply request, the heat pump type heat source unit 3 The operating cost can be reduced by using the auxiliary heat source unit 13 rather than using the auxiliary heat source unit 13.

  By the way, the heat pump heat source machine 3 may use the generated power and the purchased power at the same time depending on the generated power. For example, the relationship between the generated power and the power used in the home is in the state shown in FIG. 3B, that is, the ratio of the photovoltaic power generated in the power used by the heat pump heat source unit 3 in the rated operation state is 50% (power generation In the case of electric power 0.5 kW and purchased electric power 0.5 kW), as shown in FIG. 4, the operating cost of the heat pump heat source unit 3 is about 11 yen per 1 kWh. It is possible to reduce the operating cost by using the auxiliary heat source unit 13.

  However, even when the power generated by the solar power generation device 40 exceeds the power used in the home, the amount of power generated by the solar power generation device 40 may be small. At this time, if the heat pump heat source device 3 is rated-operated, the purchased power will occupy most of the used power. For example, the relationship between the generated power and the power used at home is as shown in FIG. 3C, that is, the ratio of the solar power generated to the power used by the heat pump heat source unit 3 is 10% (power generated 0.1 kW, purchased power). In the case of electric power 0.9 kW), as shown in FIG. 4, the operating cost of the heat pump heat source unit 3 is about 7.5 yen per 1 kWh. Therefore, when there is a hot water supply request, the auxiliary heat source unit 13 is used. The operation cost can be reduced by using the heat pump type heat source unit 3. In this case, operation prohibition control of the heat pump heat source unit 3 is not required.

  Thus, as shown in FIG. 4, in the I region where the ratio of the photovoltaic power generation to the power used by the heat pump heat source device 3 in the rated operation state is high, the operation of the heat pump heat source device 3 is prohibited and the auxiliary heat source The operation cost can be reduced by using the machine 13. On the other hand, in the II region where the ratio of the photovoltaic power generation is low, the operation cost can be reduced by operating the heat pump heat source unit 3 and using the generated power and the purchased power without selling power. That is, the set value used for the determination of S3 is slightly higher than the ratio corresponding to the portion where the inclined line indicating the operating cost of the heat pump heat source unit 3 and the horizontal line indicating the operating cost of the auxiliary heat source unit 13 intersect. It is desirable to set.

  Next, in S4, when the mode for prohibiting the operation of the heat pump heat source apparatus 3 is set, the relationship between the generated power and the electric power used in the home becomes, for example, the state shown in FIG. The electric power is always 0 kW, and the electric power used in the home is 0.5 kW. That is, when the generated power exceeds 0.6 kW, the power used in the home is supplemented by the power generation by the solar power generation device 40 and surplus power is generated, so that this surplus power can be sold.

  Next, in S5, it is determined whether or not there is a hot water supply request to the main control unit 11. If Yes, the process proceeds to S6 to drive the auxiliary heat source unit 13 to perform a hot water supply operation. For this reason, hot water supply can be performed without causing hot water shortage by using the auxiliary heat source unit 13 while maintaining the power selling state of the heat pump hot water supply system S. In No, S5 is repeated until there exists a hot water supply request | requirement, with the setting of the operation prohibition state of the heat pump type heat source machine 3 maintained.

Next, the operation and effect of the heat pump hot water supply system S of the present invention will be described.
The ratio of the electric power supplied from the solar power generation device 40 when the generated power by the solar power generation device 40 exceeds the power usage in the home and occupies the power consumption of the heat pump heat source unit 3 is a set value (for example, 40%), the hot water supply operation by the heat pump heat source device 3 is prohibited, and when there is a hot water supply request in a state where the operation of the heat pump heat source device 3 is prohibited, the auxiliary heat source device 13 To drive hot water.

  As described above, when the power generated by the solar power generation device 40 exceeds the power used in the home and the predetermined condition is satisfied, the main control unit 11 that prohibits the hot water supply operation by the heat pump heat source unit 3 is set. Since it was provided, the electric power used of the heat pump type heat source device 3 can be reduced, and the amount of electric power sold can be increased. Therefore, the operating cost (electricity charge) can be reduced. In addition, the operation cost can be reduced without the need to newly install a device having a power storage function such as an expensive power storage device.

  The main control unit 11 drives the auxiliary heat source unit 13 to perform a hot water supply operation when there is a hot water supply request in a state where the operation of the heat pump heat source unit 3 is prohibited or restricted. The hot water supply can be performed while maintaining the power selling state, and the convenience for the user is not impaired.

  Furthermore, since the predetermined condition is a case where the ratio of the electric power supplied from the solar power generation device 40 to the electric power used by the heat pump heat source device 3 exceeds the set value, the generated power of the solar power generation device 40 is low. In this case, the operation of the heat pump heat source device 3 can be continued without prohibiting the hot water supply operation by the heat pump heat source device 3.

  Next, a second embodiment in which the heat pump hot water supply system S of the first embodiment is partially changed will be described. In the first embodiment, the operation prohibition mode of the heat pump heat source apparatus 3 has been described. In the second embodiment, the output restriction mode of the heat pump heat source apparatus 3 will be described.

  The output restriction control of the heat pump heat source unit 3 performed by the main control unit 11 while the solar power generation device 40 is generating power will be described based on the flowchart of FIG. In the figure, Si (i = 11, 12,...) Indicates each step. A control program for output restriction control of the heat pump heat source device 3 is stored in advance in a storage unit (for example, ROM) of a computer of the main control unit 11. Since S11 to S13 are the same as S1 to S3 of the first embodiment, description thereof is omitted.

  Next, in S14, when the mode for limiting the output (heating capacity) of the heat pump heat source unit 3 is set, for example, the relationship between the generated power and the household power consumption becomes, for example, the state of FIG. Even if the heat pump heat source device 3 is operated, the amount of heating is reduced by the limiting operation, the power consumption is 0.5 kW, and the household power consumption is 1.0 kW. That is, when the generated power exceeds 1.0 kW, the power used in the home is supplemented by the power generation by the solar power generator 40 and surplus power is generated, so that this surplus power can be sold. The main control unit 11 stores in advance a table of electric power used according to the output of the heat pump heat source unit 3 from the outside air temperature and the incoming water temperature.

  Next, in S15, it is determined whether or not there is a hot water supply request to the main control unit 11, and if Yes, the process proceeds to S16 and the heat pump heat source unit 3 is operated in the output limited state or output. The auxiliary heat source unit 13 is operated instead of the heat pump type heat source unit 3 in the restricted state, or the hot water supply operation is performed using the heat pump type heat source unit 3 and the auxiliary heat source unit 13 in combination. When using together, according to the reduction amount of the heating by the restriction | limiting operation | movement of the heat pump type heat source unit 3, the heating amount of the auxiliary heat source unit 13 is increased to make up for the insufficient heating amount. For this reason, hot water supply can be performed without causing hot water shortage by using the auxiliary heat source device 13 or the heat pump heat source device 3 in the output limited state, regardless of the power sale state. In No, S15 is repeated until there exists a hot water supply request | requirement, with the setting of the output restriction state of the heat pump type heat source unit 3 maintained.

  Thus, the ratio of the electric power supplied from the solar power generation device 40 is set when the power generated by the solar power generation device 40 exceeds the power used in the home and the power used by the heat pump heat source unit 3 is set. When the value (for example, 40%) is exceeded, the hot water supply operation by the heat pump heat source unit 3 is limited, and when there is a hot water supply request in a state where the heat pump type heat source unit 3 is limited, The auxiliary heat source unit 13 and the like are driven to perform a hot water supply operation. Since other effects are the same as those of the first embodiment, description thereof is omitted.

Next, a mode in which the above embodiment is partially changed will be described.
[1] In the first and second embodiments, the set value used for the determinations in S3 and S13 is set to 40%, which is a ratio in which the operating cost of the heat pump heat source unit 3 shown in FIG. 4 exceeds 10 yen per 1 kWh. However, it is not necessary to limit to this set value in particular. If the operation cost can be reduced by using the auxiliary heat source unit 13, the power purchase price, the power sale price, and the fuel gas price may be used. Various setting values can be adopted.

[2] In addition, those skilled in the art can implement the present invention by adding various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. It is.

DESCRIPTION OF SYMBOLS S Heat pump hot water supply system 1 Heat pump hot water supply apparatus 3 Heat pump type heat source machine 11 Main control unit 12 Hot water storage tank 13 Auxiliary heat source machine 40 Solar power generation apparatus 45 Electric power measurement apparatus

Claims (2)

A heat pump hot water supply device having a heat pump heat source device, a hot water storage tank, and a combustion type auxiliary heat source device; and a power measurement device for measuring the power generated by the solar power generator and the power used in the home; and In the heat pump hot water supply system in which the heat pump hot water supply apparatus is capable of receiving power generation state data by communication connection with the heat pump hot water supply apparatus,
When the power generated by the solar power generator exceeds the power used in the home, the ratio of the power supplied from the solar power generator to the power used by the heat pump heat source is a heat pump heat source. A heat pump comprising a control unit that prohibits or restricts hot water supply operation by the heat pump heat source unit when a set value determined based on the operation cost of the auxiliary heat source unit and the operation cost of the auxiliary heat source unit is exceeded Hot water system.   The control unit performs hot water supply operation by driving the auxiliary heat source device when there is a hot water supply request in a state where the operation of the heat pump heat source device is prohibited or restricted. The described heat pump hot water supply system.