JP5904932B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus that heats hot water in a hot water storage tank using electric power supplied from a power conditioner to which electric power from solar power generation and commercial electric power are input.

  Conventionally, there has been proposed a hot water storage type hot water supply device that operates a heat pump that heats hot water in a hot water storage tank using electric power generated by solar power generation (see, for example, Patent Document 1).

  In the hot water storage type hot water supply apparatus described in Patent Document 1, when the electric power generated by solar power generation is equal to or higher than a predetermined level, the heat pump is operated using the electric power generated by solar power generation to store hot water The hot water in the tank is heated.

JP 2004-271164 A

  In a house equipped with a solar power generation device, when the power generated by the solar power generation device exceeds the total power consumption of the house, the surplus power exceeding the power consumption can be sold to an electric power supplier. When the unit price of power sales is higher than the unit price of commercial power, the user can increase the amount of power sold by reducing the power consumption of the house when the solar power generator is generating power. I want to.

  In addition, when there is a shortage of power during the day in an area where a house with a solar power generation device is located, the user can reduce the power consumption of the house and increase the amount of power sold. In some cases, it may be desirable to contribute to resolving local power shortages.

  However, in the hot water storage type hot water supply apparatus described in Patent Document 1, the heat pump is actively operated when the solar power generation apparatus is generating power. And in this case, since the electric power generated by the solar power generation device is consumed by the heat pump, the amount of electric power sold is reduced regardless of the intention of the user.

  In addition, in the hot water storage type hot water supply apparatus, in order to effectively use the hot water in the hot water storage tank, it is desired to boil the hot water in the hot water storage tank before the time period when a large amount of hot water is used.

  The present invention has been made in view of such a background, and suppresses a decrease in the amount of electric power sold by the photovoltaic power generation apparatus, and raises the electric power by boiling water in a hot water storage tank prepared for the use of a large amount of hot water. An object of the present invention is to provide a hot water storage type hot water supply apparatus that can be used.

  The present invention has been made to achieve the above object, and is connected to a solar power generation device and a commercial power supply line and an electric load, and the amount of power generated by the solar power generation device exceeds the power consumption of the electric load. When the surplus power generated by the solar power generator is sold, and the amount of power generated by the solar power generator is less than the power consumption of the electrical load, the power supplied from the power conditioner that purchases the insufficient power The present invention relates to a hot water storage type hot water supply apparatus that uses a hot water.

And the hot water storage type hot water supply apparatus of the present invention is
A hot water storage tank,
A water supply pipe connected to the hot water storage tank for supplying water to the hot water storage tank;
A tank heating unit that heats water in the hot water storage tank, the electric load being operated by power supplied from the power conditioner;
A hot water pipe connected to the hot water storage tank and supplied with hot water from the hot water storage tank,
A sun rise and fall time recognizing unit for recognizing in advance the sunrise time and sunset time on the boiling execution date for performing the boiling process for boiling the water in the hot water storage tank to a predetermined temperature by the heating unit;
A multiple hot water supply start time prediction unit for predicting a multiple hot water supply start time which is a time at which hot water supply of a predetermined amount or more is started from the hot water discharge pipe on the boiling execution date;
A required boiling time setting unit for setting a required boiling time that is a time required for execution of the boiling process;
When the hot water supply start time is within a range from the time after the boiling required time to the sunset time from the sunrise time, to prepare for use of hot water from the multiple hot water start time A boiling control unit that starts boiling processing before the sunrise time is provided.

  According to the present invention, with respect to the boiling-up execution date, the sunrise / sunset time recognition unit recognizes the sunrise time and the sunset time, and the multiple hot water start time prediction unit predicts the multiple hot water start time. The Further, the required boiling time is set by the required boiling time setting unit.

  When the boiling start time is within a range from the time after the boiling required time to the sunset time from the sunrise time to the sunset time, the boiling required time is more than the hot water supply start time. When the boiling-up process is started from a time just before, the heating unit is operated from the sunrise time to the sunset time, which is assumed to be generated by the solar power generation device. Therefore, the electric power generated by the solar power generator is consumed by the heating unit, and the electric power supplied from the power conditioner to the commercial power source and sold is reduced.

  Therefore, when the boiling hot water start time is within the range from the time after the boiling required time to the sunset time from the sunrise time to the sunset time, The boiling process in preparation for using hot water is started before the sunrise time. In this case, since the heating means is operated by the commercial power before the power generation by the solar power generation apparatus is started, the power generated by the solar power generation apparatus after the sunrise time is The water in the hot water storage tank can be boiled up before the start time of the multiple hot water supply.

In the present invention,
A hot water supply amount transition detection unit for detecting the transition of the hot water supply amount from the hot water pipe,
It is preferable that the multiple hot water supply start time prediction unit predicts the multiple hot water supply start time on the boiling heating execution date based on a detection result of the hot water supply amount transition detection unit on a day prior to the boiling execution date. .

  In this case, the start time of the multiple hot water supply can be predicted based on the actual use condition of hot water on the day before the boiling execution date.

In the present invention,
A data holding unit holding data of a correspondence map in which a date and a sunrise time and a sunset time on the day of the date are associated;
A boiling execution date recognition unit for recognizing the date of the boiling execution date;
The sun rise and fall time recognizing unit recognizes a sunrise time and a sunset time on the boiling execution date by applying the date of the boiling execution date recognized by the boiling execution date recognition unit to the correspondence map. It is preferable to do.

  In this case, since it is not necessary to obtain information on the sunrise time and sunset time on the boiling execution date from the outside via a communication network or the like, the sunrise time on the boiling execution date and Recognize the sunset time.

The block diagram of a hot water storage type hot water supply apparatus. Explanatory drawing of the corresponding | compatible map with a date, sunrise time, and sunset time. The flowchart of the setting process of the boiling start time in power sale priority mode. Explanatory drawing of the boiling start time.

  An embodiment of the present invention will be described with reference to FIGS. Referring to FIG. 1, a hot water storage type hot water supply apparatus 1 of the present embodiment includes a hot water storage unit 10, a heat pump unit 50 (corresponding to the electric load and tank heating unit of the present invention), a gas heat source unit 80, and a hot water storage type hot water supply. It comprises a controller 120 that controls the overall operation of the device 1.

  The hot water storage type hot water supply apparatus 1 is connected to the power conditioner 151 together with other electric loads such as the home appliance 170 via the switchboard 153, and operates using the power supplied from the power conditioner 151.

  The power conditioner 151 is connected to the photovoltaic power generation apparatus 150 and is connected to the commercial power supply line 160 via the power meter 152. The power conditioner 151 converts the DC power output from the solar power generation device 150 into AC power having the same specifications as commercial power (for example, single-phase three-wire AC 100V / 200V), and the hot water storage hot water supply device 1 and Supply to electrical loads such as household appliances 170.

  The power conditioner 151 is connected to the power meter 152, and sells power to supply surplus power to the commercial power supply line 160 when the amount of power generated by the solar power generation device 150 exceeds the total power consumption of the electric load. In addition, when the amount of power generated by the solar power generation device 150 is less than the total power consumption of the electric load, the power is purchased to receive the insufficient power from the commercial power supply line 160.

  Note that the power selling / buying here does not necessarily mean only a financial balance, but supplying power from the power conditioner 151 to the commercial power supply line 160 is referred to as power selling. In addition, supplying power from the commercial power supply line 160 to the power conditioner 151 side is referred to as power purchase.

  Measurement data of the power generation amount PV of the solar power generation device 150 is output from the power conditioner 151 to the controller 120. In addition, the power meter 152 to the controller 120 measure data of the power supply amount Cd from the commercial power supply line 160 to the power conditioner 151 (indicating a power sale state when negative, and indicating a power purchase state when positive). Is output.

  A storage battery 155 is connected to the power conditioner 151. The power conditioner 151 charges the storage battery 155 with commercial power during the midnight hours when the electricity bill is cheaper than during the day, and converts the discharge power of the storage battery 155 into AC power with the same specifications as the commercial power during the day. Then, it is supplied to an electric load such as the hot water storage type hot water supply apparatus 1 and the home appliance 170.

  In this way, by supplying the discharge power of the storage battery 155 to the electric load, the amount consumed by the electric load among the power generated by the solar power generation device 150 during the day can be reduced. Electricity can be increased.

  In FIG. 1, one controller 120 is shown as the controller of the hot water storage type hot water supply apparatus 1, but the controller of the hot water storage unit 10, the controller of the heat pump unit 50, and the controller of the gas heat source unit 80 are individually provided. It is good also as a structure which controls the whole action | operation of the hot water storage type hot-water supply apparatus 1 by communication between.

  The hot water storage unit 10 includes a hot water storage tank 11, a water supply pipe 12, a hot water discharge pipe 13, and the like. The hot water storage tank 11 keeps hot water inside and stores the hot water, and tank temperature sensors 14 to 17 arranged at substantially equal intervals in the height direction and an upper part of the hot water storage tank 11 to supply the hot water pipe 13 from the hot water storage tank 11. A tank hot water temperature sensor 26 for detecting the temperature Th of the hot water is provided. A drain valve 18 is provided at the bottom of the hot water storage tank 11 and is opened by an operator's manual operation.

  One end of the water supply pipe 12 is connected to a water supply (not shown) through the water supply port 30, and the other end is connected to the lower part of the hot water storage tank 11 to supply water to the lower part of the hot water storage tank 11. The water supply pipe 12 allows water to flow only in the direction from the water supply pipe 12 to the hot water storage tank 11 by preventing the internal pressure of the hot water storage tank 11 from becoming excessive, and to supply water from the hot water storage tank 11. A first hot water side check valve 20 is provided to prevent outflow of hot water to the pipe 12 side.

  The water supply bypass pipe 34 branched from the water supply pipe 12 communicates with the hot water discharge pipe 13 at the connection point X via the hot water supply mixing valve 21, and hot water supplied from the hot water storage tank 11 to the hot water supply pipe 13 by the hot water supply mixing valve 21. And the mixing ratio of the water supplied from the feed water bypass pipe 34 to the hot water discharge pipe 13 is changed.

  The water supply bypass pipe 34 includes a water supply temperature sensor 22 that detects a temperature Tw of water supplied to the water supply bypass pipe 34, a water-side flow sensor 23 that detects a flow rate Fw of water flowing through the water supply bypass pipe 34, and a water supply A water-side check valve 24 is provided that allows water only in the direction from the bypass pipe 34 to the hot water discharge pipe 13 and prevents outflow of hot water from the hot water discharge pipe 13 to the water supply bypass pipe 34.

  The hot water discharge pipe 13 has one end connected to the hot water supply port 31 and the other end connected to the upper part of the hot water storage tank 11. Hot water stored in the upper part of the hot water storage tank 11 is supplied from a hot water outlet pipe 13 to a hot water tap (not shown) (kitchen, washroom, bathroom currant, shower, etc.) via a hot water outlet 31. A second hot water side check valve 25 that allows the hot water pipe 13 to pass water only in the direction from the hot water storage tank 11 to the hot water discharge pipe 13 and prevents the hot water from flowing into the hot water storage tank 11 side from the hot water storage pipe 11. A hot water flow rate sensor 27 for detecting the flow rate Fh of hot water supplied from the hot water storage tank 11 to the hot water discharge pipe 13 is provided.

  The gas heat source unit 80 is provided in the middle of the downstream side of the connection point X with the feed water bypass pipe 34 of the tap water pipe 13. The hot water storage unit 10 bypasses the gas heat source unit 80 and is downstream of the gas heat source unit 80. A hot water bypass pipe 33 that connects the hot water outlet pipe 13 to the upstream side and a hot water bypass valve 29 that opens and closes the hot water bypass pipe 33 are provided.

  A mixing temperature sensor 28 for detecting the temperature Tm of hot water supplied to the hot water supply pipe 13 through the hot water supply mixing valve 21 is provided between the hot water supply mixing valve 21 and the branch point Y of the hot water supply pipe 13 with the hot water supply bypass pipe 33. A hot water supply temperature sensor 32 that detects the temperature of the hot water discharged from the hot water supply port 31 is provided between the joining point Z of the hot water supply pipe 13 and the hot water supply bypass pipe 33 and the hot water supply port 31.

  Detection signals from the sensors provided in the hot water storage unit 10 are input to the controller 120. The operation of the hot water supply mixing valve 21 and the hot water bypass valve 29 is controlled by a control signal output from the controller 120.

  Next, the heat pump unit 50 circulates the hot water in the hot water storage tank 11 through the tank circulation path 41 and heats it, and is installed outdoors. The heat pump unit 50 includes a heat pump 51 including an evaporator 53, a compressor 54, a heat pump heat exchanger 55 (condenser), and an expansion valve 56 connected by a heat pump circuit 52.

  The evaporator 53 exchanges heat between air (outside air) supplied by the rotation of the fan 60 and a heat medium (alternative chlorofluorocarbon (HFC) or other chlorofluorocarbon, carbon dioxide, etc.) flowing through the heat pump circuit 52. Do. The compressor 54 compresses the heat medium discharged from the evaporator 53 to high pressure and high temperature, and sends it to the heat pump heat exchanger 55. The expansion valve 56 releases the pressure of the heat medium pressurized by the compressor 54.

  The defrost valve 61 is provided so as to bypass the expansion valve 56, and defrosts the evaporator 53 with a heat medium sent from the compressor 54. Heat medium temperature sensors 62, 63 for detecting the temperature of the heat medium circulating in the heat pump circuit 52 are provided upstream and downstream of the expansion valve 56 of the heat pump circuit 52 and upstream and downstream of the compressor 54. 64 and 65 are provided, respectively. Further, the evaporator 53 is provided with an ambient temperature sensor 67 that detects the temperature Tout of the air sucked into the evaporator 53.

  The heat pump heat exchanger 55 is connected to the tank circulation path 41, and circulates in the tank circulation path 41 by heat exchange between the heat medium that has been increased in pressure and temperature by the compressor 54 and hot water flowing in the tank circulation path 41. Heat the hot water. The tank circulation path 41 is provided with a tank circulation pump 66 for circulating hot water in the hot water storage tank 11 through the tank circulation path 41.

  Hot water stored in the lower part of the hot water storage tank 11 is guided to the tank circulation path 41 by the tank circulation pump 66, heated to a predetermined temperature (boiling temperature) by the heat pump heat exchanger 55, and returned to the upper part of the hot water storage tank 11. . Thereby, hot water of a predetermined temperature is sequentially stacked from the upper part of the hot water storage tank 11 and stored.

  Note that hot water temperature sensors 68 and 69 for detecting the temperature of hot water flowing in the tank circulation path 41 are provided on the upstream side and the downstream side of the heat pump heat exchanger 55 in the tank circulation path 41. The heat pump heat exchanger 55 is provided with an ambient temperature sensor 57 that detects the ambient temperature inside the heat pump heat exchanger 55.

  Detection signals from the sensors provided in the heat pump unit 50 are input to the controller 120. The operation of the compressor 54, the tank circulation pump 66, and the fan 60 is controlled by a control signal output from the controller 120.

  Next, the gas heat source unit 80 heats hot water flowing through the hot water discharge pipe 13, and includes a hot water supply burner 81 housed in the can body 87, a hot water supply heat exchanger 82 heated by the hot water supply burner 81, and the like. ing.

  In addition, a hot water filled pipe 100 communicating with the bathtub 105 is provided in the middle of the hot water discharge pipe 13. The hot water filling pipe 100 is provided with a hot water filling valve 103 that opens and closes the hot water filling pipe 100, and the controller 120 closes the hot water filling valve 103, thereby allowing the hot water filling pipe 100 to pass through the hot water filling pipe 100. A hot water filling operation for supplying hot water to the bathtub 105 is executed.

  Fuel gas is supplied to the hot water supply burner 81 from a gas supply pipe (not shown), and combustion air is supplied from a combustion fan (not shown). The controller 120 controls the amount of combustion of the hot water supply burner 81 by adjusting the flow rates of the fuel gas and the combustion air supplied to the hot water supply burner 81.

  The hot water supply heat exchanger 82 is connected in the middle of the hot water discharge pipe 13, and heats the hot water flowing inside by the combustion heat of the hot water supply burner 81. The hot water discharge pipe 13 is provided with a water stop valve 93 and a water amount sensor 88 in order from the upstream side. The upstream side and the downstream side of the hot water supply heat exchanger 82 are connected by a heat source bypass pipe 89, and the heat source bypass pipe 89 is provided with a heat source bypass valve 90 for adjusting the opening degree of the heat source bypass pipe 89. Yes. A heat exchanger hot water temperature sensor 91 is provided in the vicinity of the outlet of the hot water supply heat exchanger 82 of the hot water discharge pipe 13, and a heat source hot water temperature sensor 92 is provided downstream of the location where the hot water supply pipe 13 is connected to the heat source bypass pipe 89. ing.

  With this configuration, when there is no hot water in the hot water storage tank 11 (hot water condition), water supplied from the water supply pipe 12 to the hot water discharge pipe 13 through the hot water storage tank 11 and the water supply bypass pipe 34 is supplied to the hot water supply heat exchanger 82. The hot water is heated to become hot water, mixed with water from the heat source bypass pipe 89, and hot water having a target hot water supply temperature is supplied from the hot water supply port 31.

  Detection signals from the sensors provided in the gas heat source unit 80 are input to the controller 120. Further, the operation of the hot water supply burner 81, the heat source bypass valve 90, and the hot water filling valve 103 is controlled by a control signal output from the controller 120.

  The controller 120 is an electronic circuit unit configured by a CPU, a memory, and the like (not shown). The CPU 120 executes a control program for the hot water storage hot water supply apparatus 1 held in the memory, whereby the sun rise / fall time recognition unit 121, It functions as a hot water supply start time prediction unit 122, a hot water supply amount transition detection unit 123, a required boiling time setting unit 124, a boiling control unit 125, and a timing unit 128. Further, the controller 120 is provided with a memory 126 (corresponding to a data holding unit of the present invention) holding data of a correspondence map 127 described later.

  The controller 120 is connected to the remote controller 140 via a communication cable 130. The remote controller 140 includes a display 141 for displaying the operation status of the hot water storage type hot water supply apparatus 1 and the setting of operation conditions, and a switch unit 142 provided with various switches. The user of the hot water storage type hot water supply apparatus 1 operates the switch unit 142 of the remote controller 140 to set the hot water supply temperature (target hot water supply temperature) from the hot water supply port 31 or the hot water supply temperature to the bathtub 105 in the hot water filling operation (target). Set the hot water filling temperature) and the hot water filling amount (target hot water filling amount).

  In addition, the user operates the switch unit 142 of the remote controller 140 to set “power sale priority mode” in which the power generated by the solar power generation device 150 is prioritized over power consumption due to the electrical load of the house. can do.

  The timer unit 128 (including the function of the heating execution date recognition unit of the present invention) calculates the current date and time by counting reference pulse signals output from an oscillator (not shown). Note that the timer unit 128 may be provided in the remote controller 140 so that the current date and time data is received by the controller 120 through communication with the remote controller 140.

  The sun rise and fall time recognizing unit 121 applies the current date calculated by the time measuring unit 128 to the correspondence map 127 to perform the boiling time SRT and the sunrise time SRT on the boiling execution date for performing the boiling process of the water in the hot water storage tank 11. The daylight entry time SST is acquired.

  As shown in FIG. 2A, the correspondence map 127 is a map in which a date is associated with a sunrise time SRT and a sunset time SST. Here, the correspondence map 127 is created based on past data of average sunrise time and sunset time in Japan.

  It should be noted that the installation location (installation area) of the hot water storage hot water supply device 1 can be input by a DIP switch or the like provided on the remote controller 140 or the controller 120, and the sunrise time SRT and the sunset time SST obtained from the correspondence map 127 are displayed. The hot water storage type hot water supply device 1 may be corrected according to the installation location.

  Further, the correspondence map 127 may associate the sunrise time SRT and the sunset time in units of months as shown in FIG. 2B instead of in units of dates. In this case, the sun rise and fall time recognition unit 121 acquires the sunrise time SRT and the sunset time SST corresponding to the month to which the date of the boiling execution date belongs from the correspondence map 127.

  The hot water supply amount transition detection unit 123 detects the transition of the flow rate of hot water supplied from the hot water supply port 31 or the hot water pipe 100 from the flow rates detected by the water side flow rate sensor 23, the hot water side flow rate sensor 27, and the water amount sensor 88. And held in the memory 126.

  The hot water supply start time prediction unit 122 reads the transition of the past (before the previous day) amount of hot water stored in the memory 126 and starts the hot water supply start time WST (for example, hot water in the washroom at the time of waking up). The time when hot water supply of a predetermined amount or more is started, such as hot water supply to the bathtub 105 by hot water filling operation or hot water filling operation, is predicted.

  The required boiling time setting unit 124 calculates a required boiling time WHT, which is a time required for boiling the water in the hot water storage tank 11. The required boiling time setting unit 124 responds to the outside air temperature (Tout, detected by the ambient temperature sensor 67) and the temperature of water supplied to the hot water storage tank 11 (Tw, detected by the feed water temperature sensor 22). Thus, the required boiling time WHT is set according to the setting table shown in Table 1 below.

  The setting table shown in Table 1 is determined based on data from experiments and calculations, and the data of this setting table is stored in the memory 126 in advance.

  The boiling control unit 125 performs a process of boiling the hot water in the hot water storage tank 11 before the hot water supply start time WST is reached. In addition, in the “power sale priority mode”, the boiling control unit 125 performs a process of boiling water in the hot water storage tank 11 while avoiding a time zone in which power generation by the solar power generation device 150 is assumed to be performed. By doing so, the amount of electricity sold is increased.

  Hereinafter, the processing by the controller 120 in the “power sale priority mode” will be described according to the flowchart shown in FIG.

  The controller 120 executes the flowchart shown in FIG. 3 when the boiling execution date is reached (for example, when it is midnight on that day), and performs the boiling processing of the hot water in the hot water storage tank 11 in preparation for the hot water supply. The start time (boiling start time) BST is determined.

  Steps 1 and 2 in FIG. 3 are processes performed by the sun rise / fall time recognition unit 121. The daylight appearance time recognition unit 121 acquires the date of the boiling execution date from the time measurement data by the time measurement unit 128 in STEP1. In subsequent STEP 2, the sun rise time recognition unit 121 applies the date of the boiling execution date to the correspondence map 127 to recognize the sunrise time SRT and the sunset time SST of the boiling execution date.

  The next STEP 3 is processing by the hot water supply start time prediction unit 122. The hot water supply start time prediction unit 122 predicts the hot water supply start time WST on the boiling-up execution date from the data of the hot water supply amount transition before the previous day held in the memory 126 by the hot water supply amount transition detection unit 123. Further, the subsequent STEP 4 is a process by the boiling required time setting unit 124. The required boiling time setting unit 124 sets the required boiling time WHT according to the setting table shown in Table 1 above. The boiling required time WHT may be a fixed value.

  The next STEP 5 to STEP 6 and STEP 10 are processes performed by the boiling control unit 125. The boiling-up control unit 125 determines in STEP 5 that “the hot water supply start time WST is a range from the time (SRT + WHT) after the boiling required time WHT to the sunset time SST after the sunrise time SRT”. It is determined whether or not is established.

  Then, when the above condition is satisfied, the process branches to STEP 10 and the boiling control unit 125 sets a time (SRT-WHT) that is the boiling required time WHT before the sunrise time SRT as the boiling start time BST. Then go to STEP7.

  On the other hand, when the above condition is not satisfied, the process proceeds to STEP 6 and the boiling control unit 125 sets the time (WST-WHT) that is the boiling required time WHT before the hot water supply start time WST as the boiling start time BST. Then go to STEP7. Thereafter, when the boiling start time BST is reached, the boiling control unit 125 starts boiling water in the hot water storage tank 11 in preparation for the hot water supply.

  Here, with reference to FIG. 4 (a) and FIG.4 (b), the effect by setting boiling start time BST by STEP5-STEP6 and STEP10 is demonstrated.

  In FIG. 4A, the vertical axis is set to the power generation amount (PV) by the solar power generation device 150, the horizontal axis is set to time (t), and the solar power generation in one day (0 to 24:00) The transition of the power generation amount of the device 150 is shown.

  When the condition that “the hot water supply start time WST is in the range from the time (SRT + WHT) after the boiling required time WHT to the sunset time SST” after the sunrise time SRT in STEP 5 is satisfied, FIG. Like the hot water supply start time WST1 shown in (a), the time HST1 that is the boiling required time WHT before the hot water supply start time WST1 is after the sunrise time SRT and the hot water supply start time WST1. Is before the sunset time SST.

  In this case, when the boiling-up process of the water in the hot water storage tank 11 is started from the time HST1 that is the boiling required time WHT before the hot water supply start time WST1, power generation by the photovoltaic power generation apparatus 150 is performed. In the assumed time zone (sunrise time SRT to sunset time SST), the process of boiling water in the hot water storage tank 11 is performed. Therefore, the power generated by the solar power generation device 150 is consumed by the heat pump unit 50, and the amount of power sold from the power conditioner 151 to the commercial power supply line 160 is reduced.

  As for the hot water supply start time WST2 in FIG. 4 (a), when the boiling of the water in the hot water storage tank 11 is started from the time HST2 which is the boiling required time WHT before the hot water supply start time WST2, The heat pump unit 50 operates within a time period during which power generation by the device 150 is performed. Therefore, the power generated by the solar power generator 150 is consumed by the heat pump unit 50, and the amount of power sold is reduced.

  Therefore, the BST obtained by shifting HST1 and HST2 before the sunrise time SRT is set as the boiling start time of the water in the hot water storage tank 11, so that the heat pump unit 50 is operated by commercial power to perform the boiling process. be able to. For this reason, it is possible to suppress the decrease in the amount of power sold and to perform the water boiling process in the hot water storage tank 11 provided for the hot water supply.

  If the above condition is not satisfied, the water in the hot water storage tank 11 can be started even if the hot water in the hot water storage tank 11 is started to be heated from the time before the boiling hot water start time WST by the required time WHT. The boil-up is not performed in a time zone in which it is assumed that power generation is performed by the solar power generation device 150, but the heat pump unit 50 is operated by commercial power and the boil-up process is executed.

  FIG. 4B shows a specific example in which the boiling start time BST is set when the above condition is satisfied. In FIG. 4B, PVwh is a range in which the above condition is satisfied, and indicates a range from the time after the boiling required time WHT to the sunset time SST from the sunrise time SRT.

  When the hot water supply start time WST3 is within the range of PVwh, the boiling control unit 125 starts the process of boiling water in the hot water storage tank 11 provided for the hot water supply by the process of STEP 10 in FIG. 3 described above. The boiling start time BST3 is set to a time (SRT-WHT) before the sunrise time SRT by the boiling required time WHT.

  As a result, the process of boiling water in the hot water storage tank 11 is executed by operating the heat pump unit 50 with commercial power during a time period during which no power generation is performed by the solar power generation device 150 prior to the sunrise time SRT. The Therefore, in the time zone in which power generation by the solar power generation device 150 is performed after the sunrise time SRT, the water pumping process of the water in the hot water storage tank 11 by the heat pump unit 50 is executed, and commercial power is supplied from the power conditioner 151. A decrease in the amount of power sold to the supply line 160 can be suppressed.

  In the present embodiment, when the above condition is satisfied, the boiling start time BST is set to the time (SRT-WHT) that is the boiling required time WHT minutes before the sunrise time SRT, but the boiling start time BST is set. Is set before the sunrise time SRT, an effect of suppressing a decrease in the amount of power sold from the power conditioner 151 to the commercial power supply line 160 can be obtained.

  Moreover, in this embodiment, although the hot water storage type hot water supply apparatus 1 provided with the heat pump unit 50 was shown as a tank heating part of this invention, other structures, such as an electric water heater which heats the hot water in a hot water storage tank with an electric heater, were shown. The present invention can also be applied to a hot water storage type hot water supply apparatus provided with a tank heating section.

  Further, the sun rise and fall time recognizing unit 121 recognizes the sunrise time SRT and the sunset time SST on the control target date based on the data of the correspondence map 127 held in the memory 126, but the controller 120 communicates with the communication network 180. The sunrise time SRT and the sunset time SST on the control target date may be recognized from the data received by communication with the information server 181.

  Further, the hot water supply start time prediction unit 122 estimates the hot water supply start time WST on the control target date based on the transition of the past hot water supply amount detected by the hot water supply amount transition detection unit 123, but is used for the remote controller 140. A function of setting a time for filling the bathtub 105 (filling completion time) in accordance with the operation of the switch unit 142 by the person may be provided. In this case, the hot water supply start time prediction unit 122 can estimate the time before the hot water filling completion time set by the remote controller 140 by the time required for hot water filling as the hot water supply start time WST.

  DESCRIPTION OF SYMBOLS 1 ... Hot water storage type hot water supply apparatus, 10 ... Hot water storage unit, 11 ... Hot water storage tank, 12 ... Hot water supply pipe, 13 ... Hot water discharge pipe, 50 ... Heat pump unit, 80 ... Gas heat source unit, 120 ... Controller, 121 ... Sun rise time recognition part 122 ... Hot water supply start time prediction unit, 123 ... Hot water supply amount transition detection unit, 124 ... Boiling required time setting unit, 125 ... Boiling control unit, 126 ... Memory, 127 ... Corresponding map, 128 ... Timekeeping unit, 150 ... Photovoltaic power generator, 151 ... power conditioner.

Claims (3)

When the amount of power generated by the solar power generation device exceeds the power consumption of the electrical load, the surplus power generated by the solar power generation device is sold. And when the power generation amount of the solar power generation device is lower than the power consumption of the electric load, a hot water storage type hot water supply device that uses power supplied from a power conditioner that purchases insufficient power,
A hot water storage tank,
A water supply pipe connected to the hot water storage tank for supplying water to the hot water storage tank;
A tank heating unit that heats water in the hot water storage tank, the electric load being operated by power supplied from the power conditioner;
A hot water pipe connected to the hot water storage tank and supplied with hot water from the hot water storage tank,
A sun rise and fall time recognizing unit for recognizing in advance the sunrise time and sunset time on the boiling execution date for performing the boiling process for boiling the water in the hot water storage tank to a predetermined temperature by the heating unit;
A multiple hot water supply start time prediction unit for predicting a multiple hot water supply start time which is a time at which hot water supply of a predetermined amount or more is started from the hot water discharge pipe on the boiling execution date
A required boiling time setting unit for setting a required boiling time that is a time required for execution of the boiling process;
When the hot water supply start time is within a range from the time after the boiling required time to the sunset time from the sunrise time, to prepare for use of hot water from the multiple hot water start time A hot water storage type hot water supply apparatus comprising: a boiling control unit that starts boiling processing before the sunrise time. In the hot water storage type hot water supply apparatus according to claim 1,
A hot water supply amount transition detection unit for detecting the transition of the hot water supply amount from the hot water pipe,
The multiple hot water supply start time predicting unit predicts the multiple hot water supply start time on the boiling-up execution date based on a detection result of the hot-water supply amount transition detection unit on a day before the boiling-up execution date. Hot water storage water heater. In the hot water storage type hot water supply apparatus according to claim 1 or claim 2,
A data holding unit holding data of a correspondence map in which a date and a sunrise time and a sunset time on the day of the date are associated;
A boiling execution date recognition unit for recognizing the date of the boiling execution date;
The sun rise and fall time recognizing unit recognizes a sunrise time and a sunset time on the boiling execution date by applying the date of the boiling execution date recognized by the boiling execution date recognition unit to the correspondence map. A hot water storage type hot water supply device characterized by that.