JP5904933B2 - 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 surplus is sold to an electric power supplier. Moreover, when the power generated by solar power generation cannot cover the power consumption of the house, the insufficient power is purchased from the power supplier.

  Therefore, by effectively using the power generated by the solar power generation device and reducing the amount of power purchased from the power supplier, the power generation amount of the power supplier can be reduced and the energy consumption in the power generation facility can be suppressed. it can.

  In addition, in the hot water storage type hot water supply device, in order to effectively use the hot water in the hot water storage tank, it is desirable to boil the hot water in the hot water storage tank before the time when a large amount of hot water is used. When boiling water in the hot water storage tank, the power consumption of the house increases due to the operation of a heat pump or the like.

  And in the hot water storage type hot water supply apparatus described in Patent Document 1, the heat pump is operated when the generated power of the photovoltaic power generation apparatus at the present time becomes equal to or higher than a predetermined level. Therefore, when the water generated in the hot water storage tank is heated by the heat pump and the generated power of the photovoltaic power generation apparatus is below a predetermined level, the heat pump is operated by commercial power, and the amount of power purchased increases. There is an inconvenience of doing.

  The present invention has been made in view of such a background, and when boiling water in a hot water storage tank provided for multiple hot water supply, the use of generated power by a solar power generation device is promoted to purchase commercial power. It is an object of the present invention to provide a hot water storage type hot water supply apparatus that can suppress an increase in electric energy.

  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,
Predicting the maximum solar power generation time, which is the time when the power generated by the solar power generation device is maximized, on the boiling execution date when the heating unit performs the boiling process for boiling the water in the hot water storage tank to a predetermined temperature A solar maximum power generation time prediction 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 multiple hot water supply start time is later than the time after the boiling required time from the solar maximum power generation time, the boiling process for the use of hot water from the multiple hot water start time is performed. And a boiling control unit that starts from a time within a predetermined range before and after the maximum solar power generation time.

  According to the present invention, for the boiling execution date, the maximum solar power generation time is predicted by the maximum solar power generation time prediction unit, and the multiple hot water supply start time is predicted by the multiple hot water start time prediction unit. Is done. Further, the required boiling time is set by the required boiling time setting unit.

  And when the hot water supply start time is later than the time required for the boiling up time from the solar maximum power generation time, the hot water supply start time is earlier than the hot water supply start time by the required boiling time. When the process of boiling water in the hot water storage tank is started from the time, the heating means does not operate when the generated power of the solar power generation device becomes maximum. Therefore, the utilization rate of the generated power of the solar power generation device when boiling water in the hot water storage tank may be lowered.

  Therefore, the boiling control unit, when the time before the boiling hot water start time by the required boiling time is later than the solar maximum power generation time, the hot water supply from the multiple hot water start time The boiling process in preparation for use is started at a time within a predetermined range before and after the maximum solar power generation item. And thereby, utilization of the generated power of the solar power generation device when boiling water in the hot water storage tank can be promoted, and an increase in the amount of purchased commercial power can be suppressed.

In the present invention,
A sun rise and fall time recognizing unit for recognizing in advance the sunrise time and sunset time on the heating execution day,
The solar maximum power generation time predicting unit preferably predicts the solar maximum power generation time based on the sunrise time and the sunset time.

  In this case, on the basis of the sunrise time and sunset time on the boiling execution date, for example, when the generated power of the solar power generation device becomes maximum around the time between the sunrise time and sunset time. Assuming that the maximum solar power generation time can be predicted.

In the present invention,
A solar power generation detection unit that detects power generated by the solar power generation device,
It is preferable to predict the maximum solar power generation time based on the transition of the generated power of the solar power generation device on the day prior to the boiling execution date detected by the solar power generation detection unit.

  In this case, the solar maximum power generation time can be easily predicted based on the past results of the transition of the power generated by the solar power generation device.

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, 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 energy saving 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, in the power conditioner 151, the structure which detects the electric power generation amount of the solar power generation device 150 is equivalent to the solar power generation power detection part of this invention. 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 the power generated by the solar power generation device 150 during the day, converts the discharge power of the storage battery 155 into AC power having the same specifications as commercial power at night, It supplies to electric loads, such as the hot water supply apparatus 1 and household appliances 170.

  In this way, by supplying the discharge power of the storage battery 155 to the electric load, it is possible to suppress the consumption of commercial power at night, so that the amount of power purchased can be reduced.

  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), and by executing a control program for the hot water storage type hot water supply device 1 held in the memory by the CPU, the maximum solar power generation time prediction unit 129, day / sunset time recognition unit 121, multiple hot water supply start time prediction unit 122, hot water supply amount transition detection unit 123, required boiling time setting unit 124, boiling control unit 125, and timing unit 128. Further, the controller 120 is provided with a memory 126 that holds 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 actively consume the electric power generated by the solar power generation device 150 to the electric loads such as the hot water storage hot water supply device 1 and the household appliance 170, and the like. It is possible to set the “energy saving mode” that suppresses the amount of power purchased from the business.

  By setting the “energy saving mode” to reduce the amount of electricity purchased from the electric utility, the amount of electric power generated by the electric utility's power generation facilities can be reduced, thus reducing the energy consumption of the electric utility's power generation facilities. be able to.

  The timer unit 128 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 maximum solar power generation time prediction unit 129 sets the intermediate power between the sunrise time SRT and the sunset time SST recognized by the sunrise / sunset time recognition unit 121 to the maximum generated power of the solar power generation device 150 on the execution date. Is predicted as the maximum solar power generation time PMT, which is the time when

  In addition, you may make it estimate the time when the generated electric power of the solar power generation device 150 became the maximum on the day before the boiling execution date detected by the power conditioner 151 as the solar maximum power generation time PMT. Alternatively, the controller 120 has a function of communicating with the communication network 180, and the maximum solar power generation time PMT on the control target date based on the weather forecast data of the boiling execution date received by communication with the information server 181. May be predicted.

  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 “energy saving mode”, the boiling control unit 125 executes the boiling process of the water in the hot water storage tank 11 from or near the time when the generated power of the solar power generation device 150 becomes maximum. Thus, the use of the generated power of the solar power generation device 150 in the boiling process is promoted.

  Hereinafter, the processing by the controller 120 in the “energy saving mode” will be described according to the flowchart shown in FIG. 3.

  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 solar maximum power generation time prediction unit 129. The maximum solar power generation time prediction unit 129 predicts a time intermediate between the sunrise time SRT and the sunset time SST on the heating execution date as the solar maximum power generation time PMT on the heating execution date.

  The subsequent STEP 4 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. STEP 5 is a process performed by the required boiling 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 6 to STEP 7 and STEP 10 are processing by the boiling control unit 125. The boiling-up control unit 125 determines in STEP 6 that the “multiple hot water supply start time WST is later than the time after the boiling required time WHT by the maximum solar power generation time PMT (PMT + WHT <WST)”. Judge whether or not.

  And when the said conditions are satisfied, it branches to STEP10, the boiling control part 125 sets the solar maximum power generation time PMT to the boiling start time BST, and progresses to STEP8.

  On the other hand, when the above condition is not satisfied, the process proceeds to STEP7, and the boiling control unit 125 sets a 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 STEP8.

  Thereafter, when the boiling control unit 125 recognizes that the boiling start time BST has been reached from the time measured by the time counting unit 128, the boiling control unit 125 starts a process of boiling water in the hot water storage tank 11 provided for multiple hot water supply.

  Here, with reference to FIG. 4 (a) and FIG.4 (b), the effect by setting boiling start time BST by STEP6-STEP7 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 “STEP 6 in FIG. 3 indicates that the hot water supply start time WST is later than the time after the maximum boiling power generation time PMT by the required heating time WHT (PMT + WHT <WST)” is satisfied. Like the hot water supply start time WST1 shown in FIG. 4 (a), the time HST1 before the hot water supply start time WST1 by the required boiling time WHT is later than the maximum solar power generation time PMT.

  In this case, when the process of boiling the water in the hot water storage tank 11 is started from HST1, the heat pump unit 50 does not include the maximum solar power generation time PMT, and therefore the power generation amount of the solar power generation device 150 is small. It operates by (HST1-WST1), and consumption of the commercial power by the heat pump unit 50 increases. Therefore, the amount of commercial power purchased cannot be suppressed.

  Therefore, by setting the maximum solar power generation time PMT as the start time BST1 of the boiling process of the water in the hot water storage tank 11, the heat pump unit 50 includes the time PMT at which the power generation amount of the solar power generation device 150 becomes maximum. It can be operated in the time zone HTwh.

  Therefore, the use of the generated power of the solar power generation apparatus 150 is promoted more than when the boiling water process in the hot water storage tank 11 is started from HST, and the commercial power consumed by the heat pump unit 50 during the boiling process is increased. This can reduce the amount of commercial power purchased.

  When the above condition is not satisfied, the time HST that is the boiling required time WHT before the hot water supply start time WST is before the solar maximum power generation time PMT. If it is after the time PMT, the water in the hot water storage tank 11 cannot be boiled up to the hot water supply start time WST. Therefore, in STEP 7 of FIG. 3, the boiling control unit 125 sets the boiling start time BST to a time (WST−WHT) that is the boiling required time WHT before the hot water supply start time WST.

  FIG. 4B shows a specific example in which the boiling start time BST is set when the above condition is satisfied. In FIG. 4 (b), PVwh is a range in which the above condition is satisfied, and indicates a range after time JMS after boiling required time WHT from the maximum solar power generation time PMT.

  When the multiple hot water supply start time WST2 is within the range of PVwh, the boiling control unit 125 starts the boiling process of the water in the hot water storage tank 11 provided for the multiple hot water supply by the process of STEP 10 in FIG. 3 described above. The boiling start time BST2 is set to the maximum solar power generation time PMT.

  Thereby, the boiling process of the water in the hot water storage tank 11 is performed in the range HTwh from the solar maximum power generation time PMT to the boiling required time WHT. Therefore, the water in the hot water storage tank 11 can be boiled up by operating the heat pump unit 50 in a time zone in which the amount of power generated by the solar power generation device 150 is maximum.

  In this embodiment, in STEP 10 of FIG. 3, the boiling control unit 125 sets the boiling start time BST to the solar maximum power generation time PMT. However, as illustrated in FIG. The time BST2 ′ (BST2 ′ = PMT−ΔT) that is a predetermined time ΔT before the optical maximum power generation time PMT may be set. ΔT is preferably set so that the intermediate time point of the time zone HTwh ′ in which the boiling-up process is executed is near the solar maximum power generation time PMT.

  In addition, when the above condition is satisfied, the boiling start time BST is set within a predetermined range before and after the PMT near the solar maximum power generation time PMT (for example, the power generation amount of the solar power generation device 150 is the maximum solar power generation time). The effect of the present invention can be obtained by setting the time in a time zone (70% or more of the power generation amount in the PMT).

  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. And 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 predicting unit, 123 ... Hot water supply amount transition detecting unit, 124 ... Boiling required time setting unit, 125 ... Boiling control unit, 126 ... Memory, 127 ... Corresponding map, 128 ... Timing unit, 129 ... Solar maximum power generation time prediction unit, 150 ... solar power generation device, 151 ... power conditioner.

Claims (4)

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,
Predicting the maximum solar power generation time, which is the time when the power generated by the solar power generation device is maximized, on the boiling execution date when the heating unit performs the boiling process for boiling the water in the hot water storage tank to a predetermined temperature A solar maximum power generation time prediction 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 multiple hot water supply start time is later than the time after the boiling required time from the solar maximum power generation time, the boiling process for the use of hot water from the multiple hot water start time is performed. A hot water storage type hot water supply apparatus comprising: a boiling control unit that starts at a time within a predetermined range before and after the maximum solar power generation time. In the hot water storage type hot water supply apparatus according to claim 1,
A sun rise and fall time recognizing unit for recognizing in advance the sunrise time and sunset time on the heating execution day,
The solar maximum power generation time predicting unit predicts the solar maximum power generation time based on the sunrise time and the sunset time. In the hot water storage type hot water supply apparatus according to claim 1,
A photovoltaic power detection unit that detects the amount of power generated by the photovoltaic power generator,
The solar maximum power generation time is predicted based on the transition of the power generation amount of the solar power generation device on the day before the boiling execution date detected by the solar power generation power detection unit. Hot water storage water heater. In the hot water storage type hot water supply device according to any one of claims 1 to 3,
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.

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