JP5590188B1 - Hybrid hot water supply system - Google Patents

Abstract

To provide a hybrid hot water supply system capable of reducing power consumption by using as much heat as possible of solar hot water.
A hybrid hot water supply system of the present invention includes a heating means (condensation heat exchanger 43) that heats water to generate high-temperature water, and a solar hot water generation means that generates solar hot water by heating water with solar heat. (Solar energy utilization system 2), hot water storage means (hot water storage tank 40) for storing high-temperature water and solar hot water, predicting means for predicting the relationship between the amount or amount of solar hot water that can be generated and the temperature of solar hot water, Based on the required temperature and amount of hot water, the calculation means for obtaining the relationship between the amount or amount of solar hot water available and the temperature of the solar hot water, the first relationship predicted by the prediction means, and the calculation means And control means 30 for controlling the temperature of the solar hot water generated by the solar hot water generating means based on the obtained second relationship.
[Selection] Figure 1

Description

  The present invention relates to a hybrid hot water supply system.

  Patent Document 1 discloses a heat source device that performs a heat storage operation by circulating hot water supply water in a hot water storage tank, a solar heat collector that heats the heat collection medium by solar heat, and a heat collection medium that is heated by the solar heat collector. A solar heating device that heats the hot water supply water in the tank, and a hot water supply control means that controls the heat storage operation according to the required boiling heat amount obtained by subtracting the amount of heat collected by the solar heating device from the required heat amount for hot water supply. A hybrid hot water supply system is disclosed. The hot water supply control means includes weather prediction information input means and weather prediction information determination means for determining the input weather prediction information, and corrects the heat collection heat amount based on the determined weather prediction information.

JP 2006-153383 A

  In the hybrid hot water supply system of Patent Document 1 described above, the heat collection operation is controlled by correcting the amount of heat collected by the solar heating device based on the weather prediction information. However, it may not be possible to make an appropriate determination based only on the amount of heat collected. For example, depending on weather conditions and the like, the temperature of the solar hot water generated by the solar heating device may be lower than the temperature that can be directly used for hot water supply, and a large amount of the low-temperature solar hot water may be generated. In such a case, it is necessary to mix and use solar hot water and high-temperature water stored by the heat storage operation so that the temperature becomes higher than the temperature that can be directly used for hot water supply. As a result, the solar hot water cannot be used up, and the solar hot water may be wasted. When solar hot water is wasted, the amount of heat generated by the heat storage operation must be increased accordingly, and thus power consumption increases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a hybrid hot water supply system that can reduce the power consumption by using as much heat as possible in the solar hot water.

  The hybrid hot-water supply system according to the present invention includes heating means for heating water to generate high-temperature water, solar hot water generating means for heating water by solar heat to generate solar hot water, and hot-water storage means for storing high-temperature water and solar hot water And a means for predicting the relationship between the amount of solar hot water that can be generated or the amount of solar hot water and the temperature of the solar hot water, and the amount or amount of solar hot water available and the amount of solar heat based on the temperature and amount of hot water required. The solar hot water generated by the solar hot water generating means based on the calculating means for obtaining the relationship with the temperature of the hot water, the first relation predicted by the predicting means, and the second relation obtained by the calculating means. And a control means for controlling the temperature.

  According to the present invention, it is possible to reduce power consumption by using as much heat as possible in solar hot water.

It is a block diagram which shows the hybrid hot-water supply system of Embodiment 1 of this invention. It is a figure which shows the relationship between the temperature and quantity of solar hot water which can be produced | generated, and the relationship between the temperature and quantity of solar thermal water which can be utilized. It is a flowchart which shows the control method of nighttime hot water storage driving | operation. It is a flowchart which shows the control method of solar hot water production | generation operation and hot water storage operation of a daytime. It is a block diagram which shows the hybrid hot-water supply system of Embodiment 2 of this invention. It is a block diagram which shows the hybrid hot-water supply system of Embodiment 3 of this invention.

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

Embodiment 1 FIG.
FIG. 1 is a configuration diagram illustrating a hybrid hot water supply system according to Embodiment 1 of the present invention. As shown in FIG. 1, the hybrid hot water supply system 10 according to the first embodiment includes a heat pump hot water supply system 1 and a solar energy utilization system 2 (solar hot water generation means).

  The heat pump hot water supply system 1 includes a weather prediction information collection unit 20 that collects weather prediction information from the outside, a control unit 30, a hot water storage tank 40 (hot water storage unit) that stores hot water, a compressor 41, an expansion valve 42, Condensation heat exchanger 43 (heating means) that heats water with the refrigerant, evaporating heat exchanger 44 that evaporates the refrigerant using air taken from outside as a heat source, water between the hot water storage tank 40 and the condensation heat exchanger 43 Is heated by the condensation heat exchanger 43, a circulation pump 45 that circulates water, a blower 70 that blows air to the evaporation heat exchanger 44, a pre-heating pipe 50 through which water sent from the hot water storage tank 40 to the condensation heat exchanger 43 passes. Water (hereinafter referred to as “hot water”) after heating when the hot water tank 40 is sent to the hot water storage tank 40, and hot water taken out from the middle temperature layer of the intermediate portion with respect to the total height of the hot water tank 40 ( The hot water outlet pipe 52 through which the hot water discharged from the top of the hot water storage tank 40 passes, the junction of the hot water outlet pipe 52 and the hot water outlet pipe 53. And a hot water supply pipe 54 provided on the downstream side.

  The solar energy utilization system 2 includes a solar heat hybrid PV (photovoltaic) panel 46. The solar heat hybrid PV panel 46 is a solar power generation panel 46a that converts sunlight into electric energy, and a heat medium (in this embodiment 1, water is disposed on the back side of the solar power generation panel 46a and heated by solar heat. And a heat collector 46b having a flow path. The solar energy utilization system 2 further includes a circulation pump 47 that circulates water to the heat collector 46b of the solar thermal hybrid PV panel 46, and water that is sent from the hot water storage tank 40 to the heat collector 46b of the solar thermal hybrid PV panel 46. A heat collecting return pipe 55 and water heated by the heat collector 46 b of the solar heat hybrid PV panel 46 (hereinafter referred to as “solar hot water”) are sent to the hot water storage tank 40. 56.

  The hot water storage tank 40 stores hot water while forming temperature stratification so that the upper side in the hot water storage tank 40 is hot and the lower side is low temperature. A water supply pipe 71 is connected to the bottom of the hot water storage tank 40 to supply water (low temperature water) from a water source such as an external water supply into the hot water storage tank 40. The return pipe 56 for collecting heat is connected to an intermediate portion with respect to the total height of the hot water storage tank 40. When solar hot water is generated by the solar energy utilization system 2, the solar hot water flowing from the return pipe 56 for collecting heat into the middle temperature layer on the lower layer side of the upper high temperature layer in which the high temperature water in the hot water storage tank 40 is stored. Is stored. When solar hot water is stored in the hot water storage tank 40, the solar hot water in the hot water storage tank 40 can be taken out from the hot water hot water supply pipe 52 as medium hot water.

  In addition, the hot water storage tank 40 and each pipe are covered with a heat insulating material, and are insulated from the atmosphere. Further, the hot water discharged from the hot water supply pipe 54 may be directly used in, for example, a bathtub filling, a shower, a sink faucet, or a hot water supply device such as a gas water heater or an electric water heater (not shown) as an auxiliary heat source. May be used in combination.

  The hybrid hot water supply system 10 further includes a pre-heating temperature detection means 60 that detects the temperature of water flowing into the condensation heat exchanger 43 (that is, the temperature of water before heating), and high-temperature water flowing out of the condensation heat exchanger 43. After-heating temperature detection means 61 for detecting the temperature, high-temperature water tapping temperature detection means 62 for detecting the temperature of high-temperature water taken out from the top of the hot water storage tank 40 by the high-temperature water tapping pipe 53, and hot water from the intermediate portion of the hot water storage tank 40 Hot water hot water temperature detecting means 63 for detecting the temperature of medium hot water taken out by the hot water piping 52, hot water temperature detecting means 64 for detecting the temperature of hot water flowing through the hot water piping 54, and outside air temperature detecting means 65 for detecting the temperature of the outside air. And solar hot water temperature detecting means 66 for detecting the temperature of the solar hot water generated by the solar energy utilization system 2.

  The weather prediction information collection means 20 collects weather prediction information (for example, solar radiation amount, outside air temperature, etc.) from an external server 200 that distributes weather prediction information via a network 100 such as the Internet. The control means 30 can receive the weather forecast information collected by the weather forecast information collecting means 20. Although not shown, the control unit 30 is connected to a user interface device (for example, a remote control device installed in a bathroom, a kitchen, or the like) so as to communicate with each other. The control means 30 can receive information such as the hot water temperature instructed by the user from the user interface device. The control means 30 has a timer function for measuring time and time.

  The control means 30 includes information obtained by the above-described temperature detection means 60, 61, 62, 63, 64, 65, 66, weather forecast information obtained from the weather forecast information collection means 20, and a user obtained from the user interface device. Control information of the hybrid hot water supply system 10 (for example, the operating state of the compressor 41, the expansion valve 42) based on the instruction information from the control unit, information obtained by flow rate detection means (not shown) for detecting the flow rate of hot water in each pipe, and the like. Actuator control such as the opening degree, the air flow rate of the blower 70, the operating state of the circulation pump 45, and the operating state of the circulation pump 47). The compressor 41, the circulation pump 45, and the circulation pump 47 may each be a type in which the rotation speed is controlled by an inverter and the capacity is controlled. The expansion valve 42 may be an electronic expansion valve whose opening degree is variable. The condensing heat exchanger 43 may be a plate type or double pipe type heat exchanger.

  At the junction between the hot water hot water piping 52 and the high temperature water hot water piping 53, a first ratio capable of controlling the mixing ratio between the medium hot water supplied from the hot water hot water piping 52 and the high temperature water supplied from the high temperature water hot water piping 53. Mixing means (not shown) is provided. The first mixing means can cause only one of the medium-temperature water supplied from the hot-water tap water piping 52 and the high-temperature water supplied from the hot-water tap water piping 53 to flow into the tap-water piping 54. A water supply pipe 72 is branched from the middle of the water supply pipe 71. In the middle of the hot water supply pipe 54 upstream of the hot water temperature detection means 64, a second mixing means (not shown) that mixes the low temperature water supplied from the water supply pipe 72 with the hot water in the hot water supply pipe 54 and can control the mixing ratio. Is omitted). The second mixing means can prevent the low-temperature water supplied from the water supply pipe 72 from being mixed with the hot water in the tap water pipe 54. The control means 30 controls the mixing ratio of the first mixing means and the second mixing means so that the hot water temperature detected by the hot water temperature detecting means 64 becomes the hot water temperature instructed by the user. The said mixing means can be comprised using a three-way valve, a flow regulating valve, etc., for example. From the water supply pipe 71, the same amount of low temperature water as the outflow from the hot water hot water discharge pipe 52 and the high temperature water hot water supply pipe 53 flows into the lower part of the hot water storage tank 40, and the hot water storage tank 40 is always kept full.

  The temperature of the water flowing into the condensation heat exchanger 43 may be estimated based on the outside air temperature detected by the outside air temperature detecting means 65 or the weather prediction information obtained from the weather prediction information collecting means 20. . In this case, the pre-heating temperature detection means 60 may not be installed. Further, the hot water hot water temperature detecting means 62 and the hot water hot water temperature detecting means 63 can be installed at the hot water temperature detecting means 64 because the hot water temperature detecting means 64 can meet the demand on the load side. Further, a hot water storage temperature detecting means for measuring the temperature in the hot water storage tank 40 may be installed. In that case, you may install a some hot water storage temperature detection means in a different height position. By providing the hot water storage temperature detection means, the operation control of the hybrid hot water supply system 10 can be performed with higher accuracy.

  Next, hot water storage operation and solar hot water generation operation in hybrid hot water supply system 10 of the first embodiment will be described. The hot water storage operation is an operation in which the heat pump cycle (refrigeration cycle) and the circulation pump 45 of the heat pump hot water supply system 1 are operated to generate high temperature water by the condensation heat exchanger 43 and the generated high temperature water is stored in the hot water storage tank 40. . Hot water storage operation is carried out mainly at night, especially in the late-night price period when electricity unit price is cheap. The solar hot water generation operation is an operation for generating solar hot water by operating the circulation pump 47 of the solar energy utilization system 2 during the daytime, that is, in the daylight hours, and storing the generated solar hot water in the hot water storage tank 40.

  As a general hot water supply load at home, the hot water supply load from evening to night, which is used for hot water filling, showering, etc., is the largest in the day. For this reason, at night, which is a late night charge time zone, there is little hot water held in the hot water storage tank 40, and most of the hot water storage tank 40 is occupied by low temperature water supplied from the water supply pipe 71. The control means 30 has a function of predicting the hot water supply load of the next day based on data or the like learned from the daily hot water supply load, and hot water storage operation and solar hot water are provided so that the predicted hot water supply load can be covered. The generation operation is controlled, and the amount of heat is stored in the hot water storage tank 40.

  The control means 30 can acquire the next day's weather forecast information (sunlight amount, outside temperature, etc.) from the weather forecast information collecting means 20 at night, and can generate it in the sunshine hours of the next day based on the obtained weather forecast information. It has a function to predict the temperature and amount of hot solar water. Moreover, the control means 30 may perform this prediction in consideration of information obtained by learning actual values of the temperature and amount of solar hot water generated in the past solar hot water generation operation.

  Based on the measured values of the pre-heating temperature detection means 60, the post-heating temperature detection means 61, and the outside air temperature detection means 65, the control means 30 uses the temperature and amount of necessary high-temperature water in the hot water storage operation at night as a target value. The compressor 41, the expansion valve 42, the circulation pump 45, and the blower 70 are controlled.

  In the solar hot water generation operation during the daytime, the control means 30 controls the circulation pump 47 based on the measured value of the solar hot water temperature detection means 66 with the predicted values of the temperature and amount of solar hot water that can be generated as target values. .

  In the evening after the end of the solar hot water generation operation, the hot water storage tank 40 is filled with a sufficient amount of hot water and solar hot water to cover the hot water supply load, and can handle hot water loads from evening to night. It becomes possible. When the hot water is discharged from the hot water supply pipe 54, the control means 30 preferentially uses the solar hot water as follows, and performs the hot water so that the solar hot water is used up as much as possible. When the temperature detected by the hot-water hot water temperature detection means 63 is equal to or higher than the temperature that can be directly used for hot water supply (for example, 40 ° C. or the hot water temperature instructed by the user), the hot water in the hot water storage tank 40 is replaced with hot water. Without flowing out into the hot water supply pipe 53, the hot water is made to flow out only from the hot water hot water supply pipe 52. Thereby, solar hot water can be directly used for hot water supply. On the other hand, when the temperature detected by the hot water hot water temperature detection means 63 is lower than the temperature that can be directly used for hot water supply, the hot water flowing out from the hot water hot water piping 53 and the hot water flowing out from the hot water hot water piping 52 are separated. Then, the mixture is mixed so that the temperature can be directly used for hot water supply, and the hot water is discharged from the hot water supply pipe 54.

  In the hybrid hot water supply system 10 of the first embodiment, the temperature and amount of high-temperature water generated by nighttime hot water storage operation and the temperature and amount of solar hot water generated by daytime solar hot water generation operation are changed according to the weather and season. Accordingly, it can be appropriately controlled.

  When the amount of solar radiation is large and the temperature of the solar thermal hybrid PV panel 46 is high, such as in clear weather and summer (for example, from April to September), whether a large amount of solar hot water is generated by the solar hot water generation operation in the daytime. Or produce relatively hot solar water. In such a case, one or both of the temperature and the amount of high-temperature water generated by the hot water storage operation at night are set low. Thereby, after the hot water supply load is finished, not only can a large amount or high-temperature solar hot water obtained during the day be used up, but an excessive hot water storage operation can be avoided, so that the power consumption of the hybrid hot water system 10 can be reduced. .

  Cloudy, sometimes sunny, low winter temperatures (eg, October to March), etc. The solar radiation hybrid PV panel 46 is cooler than in the case of sunny weather, or is sunny but the outside temperature is low. In this case, a large amount of solar hot water having a temperature lower than that directly used for hot water supply is generated. In such a case, the temperature of high-temperature water generated by nighttime hot water storage operation is increased and the amount is set low. Thereby, since the temperature rise width of the water at the time of heating increases, the power consumption per unit time increases, but since the amount of water to be heated decreases, the integrated power consumption can be reduced.

  When there is almost no amount of solar radiation and the temperature of the solar heat hybrid PV panel 46 becomes low like cloudy weather or rainy weather, solar hot water cannot be generated even if the solar hot water generation operation is performed in the daytime. In such a case, it is possible to prevent running out of hot water during a hot water supply load by increasing the amount of high-temperature water generated by nighttime hot water storage operation.

  In addition, when the hot water supply load is not generated for the convenience of the user (including the case where the hot water supply load is less than expected; the same applies hereinafter), the amount of heat stored in the hot water storage tank 40 remains. In such a case, the control means 30 calculates the predicted value of the amount of heat of solar hot water obtained the next day by predicting the temperature and amount of solar hot water that can be generated the next day based on the weather prediction information of the next day. However, when the sum of the predicted value and the heat storage amount remaining in the hot water storage tank 40 is larger than the predicted heat amount of the hot water supply load on the next day, the nighttime hot water storage operation may not be performed. Thereby, the power consumption of the hybrid hot water supply system 10 can be reduced. In addition, when the sum of the predicted value of the amount of heat of solar hot water obtained the next day and the amount of stored heat remaining in the hot water storage tank 40 is smaller than the amount of heat of the predicted value of the hot water supply load on the next day, that amount is insufficient. The hot water storage operation at night may be performed so that the amount of heat is added to the hot water storage tank 40.

  In the following, as an example, the temperature and amount of hot water necessary for one day are set to 40 ° C. and 420 L, the water supply temperature from the water supply pipe 71 is set to 10 ° C., the outside air temperature is set to 10 ° C., and the temperature directly usable for hot water supply is set. The description will be made assuming that the temperature is 40 ° C. and the temperature of the hot water stored by the hot water storage operation is 60 ° C. (1) In case of fine weather or summer, (2) In case of cloudy and sometimes sunny, or in winter when the outside temperature is low, (3) In case of cloudy or rainy weather, (4) When no hot water supply load occurs Will be described sequentially. It should be noted that the numerical values such as temperature and capacity described in this specification including the description here are merely examples, and it goes without saying that the numerical values can be arbitrarily changed.

(1) In the case of fine weather or summer The predicted value of the temperature and amount of solar hot water that can be generated the next day is 40 ° C. and 210 L. The daily hot water supply load [J] is determined by the product of the required amount of hot water [420L], the specific heat of water [4180 J / kg · K], and the temperature difference [40 ° C.-10 ° C.] between the water supply temperatures. The predicted value [J] of the amount of solar hot water that can be generated the next day is the temperature difference [40 ° C.-10 ° C.] between the amount of solar hot water [210 L], the specific heat of water [4180 J / kg · K], and the feed water temperature. ] And the product. Assuming that the amount of high-temperature water stored by nighttime hot water storage operation is X [L], the heat quantity [J] of hot water stored by nighttime hot water storage operation is the amount of high-temperature water X [L] and the specific heat of water [4180 J / kg]. -It is calculated | required by the product of the temperature difference [60 degreeC-10 degreeC] with feed water temperature. The equation is calculated such that the sum of the predicted value [J] of the amount of heat generated by solar hot water the next day and the amount of heat [J] of hot water stored during nighttime hot water storage operation is equal to the daily hot water supply load [J]. By solving, the amount X of high-temperature water stored by the hot water storage operation at night becomes X = 126L.

(2) In the case of winter when the weather is sometimes cloudy or the outside temperature is low. The predicted value of the temperature and amount of solar hot water that can be generated the next day is set to 20 ° C. and 250 L. In this case, by solving the equation in the same manner as described above, the amount X of high-temperature water stored by the hot water storage operation at night becomes X = 202L.

(3) In case of cloudy weather or rainy weather In this case, since the solar hot water cannot be generated, the predicted value [J] of the amount of solar hot water that can be generated the next day is zero. Therefore, in this case, by solving the equation so that the amount of heat [J] of hot water stored by nighttime hot water storage operation becomes equal to the daily hot water supply load [J], hot water stored by nighttime hot water storage operation is obtained. The quantity X is X = 252L.

(4) When no hot water supply load is generated The temperature and amount of unused high-temperature water remaining in the hot water storage tank 40 are 60 ° C. and 130 L, and the predicted value of the temperature and amount of solar hot water that can be generated the next day is 30. C., 200 L. The amount of stored heat [J] remaining in the hot water storage tank 40 is the temperature difference between the amount of high-temperature water [130 L] remaining in the hot water storage tank 40, the specific heat of water [4180 J / kg · K], and the feed water temperature [ 60 ° C-10 ° C]. In this case, the sum of the heat storage amount [J] remaining in the hot water storage tank 40 and the predicted value [J] of the heat amount of solar hot water that can be generated the next day is less than the daily hot water supply load [J]. It is necessary to carry out hot water storage operation at night. In this case, the heat storage amount [J] remaining in the hot water storage tank 40, the predicted value [J] of the heat amount of solar hot water that can be generated the next day, and the heat amount [J] of high-temperature water stored by nighttime hot water storage operation. By solving the equation so that the sum is equal to the hot water supply load [J] of the day, the amount X of high-temperature water stored by the hot water storage operation at night becomes X = 42L.
On the other hand, it is assumed that the temperature and amount of unused high-temperature water remaining in the hot water storage tank 40 are 60 ° C. and 200 L, and the predicted value of the temperature and amount of solar hot water that can be generated the next day is 30 ° C. and 200 L. In this case, the sum of the heat storage amount [J] remaining in the hot water storage tank 40 and the predicted value [J] of the amount of heat of solar hot water that can be generated the next day is equal to or greater than the daily hot water supply load [J]. Therefore, it is not necessary to carry out hot water storage operation at night.

  Next, a backup operation method when the weather prediction is lost in the hybrid hot water supply system 10 of the first embodiment will be described. When the weather forecast is not met, for example, the forecast information of the next day's weather obtained by the weather forecast information collecting means 20 is sunny, but it is sometimes sunny, cloudy, or rainy in the actual daylight hours. If the amount of solar radiation or temperature does not reach the predicted value, the hot water stored in the hot water storage operation at night may be used up and the hot water may run out. In order to prevent such hot water shortage, in the first embodiment, the temperature and amount of solar hot water that can be generated are predicted again during the daytime in a certain set time period, and the daytime hot water storage operation for compensating for the shortage. I do.

  In addition, although the forecast information of the next day's weather obtained by the weather forecast information collecting means 20 is cloudy and sometimes clear, it becomes clear in the actual daylight hours, and the amount of solar radiation or temperature shows the predicted value. When it exceeds, it becomes possible to obtain solar hot water having a temperature higher than the predicted value in the solar hot water generation operation during the daytime. In such a case, in the first embodiment, the temperature and amount of solar hot water that can be generated are predicted again during the daytime in a certain set time period, and solar hot water having a temperature higher than the initial predicted value is obtained. In addition, solar hot water generation operation during the day may be performed. In addition, by using solar hot water that is hotter than expected, the usage rate of solar hot water generated by daytime solar hot water generation operation increases with respect to the daily hot water supply load. Although the water is not used up, the remaining hot water is used for hot water supply the next day.

  FIG. 2 is a diagram showing the relationship between the temperature and amount of solar hot water that can be generated, and the relationship between the temperature and amount of available solar hot water. In FIG. 2, the temperature [° C.] of the solar hot water is shown on the horizontal axis, and the amount [L] of the solar hot water is shown on the vertical axis.

  In this Embodiment 1, the temperature of the solar hot water produced | generated is controlled by making into an index the relationship as shown in FIG. 2 at the time of the solar hot water production | generation operation | movement as backup operation | movement when a weather prediction remove | deviates. In particular, in the first embodiment, the control means 30 makes the amount of solar hot water [L] or heat [J] that can be generated equal to the amount [L] or heat [J] of available solar hot water. As such, the temperature of the solar hot water generated is controlled. In order to control the temperature of the generated solar hot water, for example, the flow rate of the circulation pump 47 may be controlled. That is, by increasing the flow rate of the circulation pump 47, the temperature of the generated solar hot water can be lowered, and by reducing the flow rate of the circulation pump 47, the temperature of the generated solar hot water can be increased. it can.

  Here, as an example, based on weather forecast information at night time, the temperature and amount of solar hot water that can be generated by daytime solar hot water generation operation are predicted to be 40 ° C. and 190 L, and 60 ° C. in night hot water storage operation, A description will be given of a case where the actual solar radiation amount or the temperature does not reach the predicted value during the daytime solar hot water generation operation after 140 L of hot water is stored in the hot water storage tank 40. In this case, the control means 30 determines the relationship between the amount of solar hot water [L] or the amount of heat [J] that can be generated and the temperature of the solar hot water (hereinafter referred to as “first” in the daytime based on the latest weather forecast information). (Referred to as “relationship”). The dashed curve in FIG. 2 shows an example of the first relationship (here, the relationship between the amount of solar hot water that can be generated [L] and the temperature of the solar hot water) predicted by the control means 30. Yes. The first relationship is such that the amount of solar hot water [L] or the amount of heat [J] that can be generated decreases as the temperature of the solar hot water increases. For example, in the case of the example shown in FIG. 2, the amount of solar hot water that can be generated is 600 L when the temperature of the solar hot water is 20 ° C., and the solar hot water that can be generated when the temperature of the solar hot water is 30 ° C. Is 280 L, and when the temperature of solar hot water is 40 ° C., the amount of solar hot water that can be generated is 150 L.

Further, the control means 30 determines the relationship between the amount of available solar hot water [L] or the amount of heat [J] and the temperature of the solar hot water based on the required temperature and amount of hot water (hereinafter referred to as “second relationship”). "). The solid curve in FIG. 2 shows an example of the second relationship obtained by the control means 30 (here, the relationship between the amount of available solar hot water [L] and the temperature of the solar hot water). Yes. The second relationship is such that the amount of available solar hot water [L] or the amount of heat [J] increases as the temperature of the solar hot water increases. The control means 30 calculates | requires a 2nd relationship as follows, for example. In this example, the temperature and amount of hot water required are 40 ° C. and 420 L, and the temperature of the hot water in the hot water storage tank 40 is 60 ° C. When the temperature of the solar hot water is equal to the temperature of the required hot water, the solar hot water can be directly used for hot water supply, so that the amount of available solar hot water is equal to the amount of hot water required. Therefore, in this example, when the temperature of the solar hot water is 40 ° C., the amount of available solar hot water is 420 L. On the other hand, when the temperature of the solar hot water is lower than the temperature of the required hot water, the solar hot water cannot be used directly for hot water supply. Must be used. When the temperature of solar hot water is α [° C.] and the amount of available solar hot water is Y [L], in this example, solar hot water of α [° C.] and Y [L], 60 ° C., (420 -Y) The required high temperature water of L is mixed, and the required 40 degreeC and 420L hot water are supplied. Therefore, the following equation holds.
α × Y + 60 × (420−Y) = 40 × 420 (1)

  In this example, the second relationship is obtained by the above equation (1). For example, when the temperature of solar hot water is α = 30 ° C., the amount of available solar hot water is Y = 280 L, and when the temperature of solar hot water is α = 20 ° C., the amount of available solar hot water Y = 210L.

  In this Embodiment 1, the control means 30 is the amount [L] or calorie | heat amount [J] of the solar hot water which can be produced | generated in a 1st relationship, and the amount [L] or the amount of solar hot water which can be utilized in a 2nd relationship. The temperature of the solar hot water to be generated is controlled based on the temperature of the solar hot water so that the amount of heat [J] is equal. In the case of the above example, when the temperature of solar hot water is 30 ° C., the amount of solar hot water that can be generated in the first relationship and the amount of solar hot water that can be used in the second relationship are both 280 L. The amount of heat [J] that can be generated is equal to the amount of heat [J] that can be used. Therefore, the control means 30 controls the flow rate of the circulation pump 47 so that the target temperature of the generated solar hot water is 30 ° C. and the temperature of the solar hot water detected by the solar hot water temperature detecting means 66 is 30 ° C. I do. In the first embodiment, the control unit 30 has a function as a prediction unit that predicts the first relationship and a function as a calculation unit that obtains the second relationship.

  As described above, according to the first relationship, the amount of heat of solar hot water that can be generated decreases as the temperature of the generated solar hot water increases. In other words, the amount of heat generated by the solar hot water increases as the temperature of the generated solar hot water decreases. For this reason, in order to increase the amount of heat of solar hot water stored in the hot water storage tank 40, it is advantageous to lower the temperature of the generated solar hot water. However, if the amount of solar hot water generated or the amount of heat exceeds the amount of solar hot water available or the amount of heat in the second relationship, the excess amount remains in the hot water storage tank 40 without being used eventually, and is wasted. Become. On the other hand, in the first embodiment, the amount of solar hot water that can be generated in the first relationship or the amount of heat is equal to the amount of solar hot water that can be used in the second relationship or the amount of heat. Since the temperature of the solar water is controlled, the generated solar hot water can be used up without leaving as much as possible. Moreover, since the temperature of the generated solar hot water is controlled as low as possible within a range where the solar hot water can be used up without leaving, the amount of heat of the generated solar hot water can be increased as much as possible. For this reason, in the first embodiment, the energy of the solar hot water can be utilized to the maximum, so that the power consumption of the hybrid hot water supply system 10 can be reliably reduced.

  In addition to the first relationship and the second relationship, the control means 30 may control the temperature of the generated solar hot water based on the capacity of the solar hot water that can be stored in the hot water storage tank 40. For example, in the above example, since there is 140 L of high-temperature water in the hot water storage tank 40, if the total capacity of the hot water storage tank 40 is 400 L, the capacity of solar hot water that can be stored in the hot water storage tank 40 is 400 L−140 L = 260L. When the temperature of the generated solar hot water is 30 ° C., the amount of the generated solar hot water is 280 L, so that the hot water storage tank 40 cannot be fully filled. Therefore, in such a case, based on the first relationship, the temperature of the solar hot water to be generated so that the amount of solar hot water that can be generated is equal to or less than the capacity of the solar hot water that can be stored in the hot water storage tank 40. May be controlled. That is, in the above example, the temperature of the generated solar hot water may be controlled so that the amount of solar hot water that can be generated is 260 L or less. In the above example, from the first relationship shown in FIG. 2, the temperature of the solar hot water when the amount of solar hot water that can be generated is 260 L is about 32 ° C. Therefore, the control means 30 controls the temperature of the generated solar hot water to be 32 ° C. or higher, thereby reducing the amount of the generated solar hot water below the capacity of the solar hot water that can be stored in the hot water storage tank 40. be able to.

  In the above-described example, the case of the solar hot water generation operation as the backup operation when the weather prediction is off has been described, but in the present invention, in the normal solar hot water generation operation when the weather prediction is not off, Similarly, the temperature of the solar hot water generated based on the first relationship and the second relationship, or based on the first relationship, the second relationship, and the capacity of the solar hot water that can be stored in the hot water storage tank 40 May be controlled.

  As described above, the operation of the hybrid hot water supply system 10 may be an operation that assumes that the amount of heat stored in the nighttime hot water storage operation and the daytime solar hot water generation operation is used up for the daily hot water supply load. However, in actuality, there may be a case where hot water runs out due to hot water being discharged in a different time zone than expected. For example, the time zone in which the main hot water supply load is generated is a later time zone than expected, and high temperature water stored in the hot water storage operation at night stays in the hot water storage tank 40 for a long time. As a result of the temperature difference lasting for a long time and the heat dissipation amount increasing, it is conceivable that hot water runs out. In order to prevent such a situation, the control means 30 may control the heat storage amount during nighttime hot water storage operation by adding a preset heat amount or a heat amount based on a user instruction. Alternatively, the control unit 30 may subtract the predicted value of the amount of heat of solar hot water generated by the solar hot water generation operation during the day by a preset amount of heat or a heat amount based on a user's instruction, and estimate it lower. Good. By these things, generation | occurrence | production of hot water can be suppressed more reliably. If the amount of heat to be added to the amount of heat stored in the nighttime hot water storage operation or the amount of heat deducted from the predicted value of the amount of heat from solar hot water has been changed, a calculation that takes into account the set value is performed before the nighttime hot water storage operation is started. It is preferred to do so.

  Next, a control method of the hybrid hot water supply system 10 of the first embodiment will be described based on FIG. 3 and FIG. FIG. 3 is a flowchart illustrating a method for controlling the hot water storage operation at night. FIG. 4 is a flowchart showing a method for controlling daytime solar hot water generation operation and hot water storage operation. The control shown in FIGS. 3 and 4 is performed by the control means 30.

  The control related to the hot water storage operation at night shown in FIG. 3 is a predetermined midnight time zone (generally, a midnight power rate is set and the electricity rate is discounted, for example, from 23:00 to 7:00 the next morning) Depending on the implementation. First, in step S <b> 1, the weather prediction information (the amount of solar radiation, the outside air temperature, etc.) collected by the weather prediction information collection unit 20 is received from the weather prediction information collection unit 20.

  Next, in step S2, it is determined whether or not there is a heat amount set to be subtracted from the heat storage amount to be added to the heat storage amount of nighttime hot water storage operation or the predicted value of the amount of heat of solar hot water in order to suppress hot water shortage. If there is such setting, the process proceeds to step S3. In step S3, the amount of heat to be added to the amount of heat stored in the nighttime hot water storage operation or the amount of heat to be subtracted from the predicted value of the amount of heat of solar hot water is set, and the process proceeds to step S4. If there is no setting for suppressing hot water shortage, the process proceeds to step S4 without going through step S3.

  In step S4, based on the weather prediction information obtained in step S1 and the calorific value set in step S3, the temperature and amount of solar hot water that can be generated in the daytime solar hot water generation operation are predicted. The process proceeds to step S5.

  In step S5, the presence or absence of unused high-temperature water remaining without supplying hot water the previous day is determined. If there is unused high-temperature water, the process proceeds to step S6.

  In step S6, it is determined whether or not the hot water supply load on the next day can be covered with unused high-temperature water and solar hot water obtained by the solar hot water generation operation on the next day. When the hot water supply load on the next day is larger than the total amount of heat of the unused hot water and the solar hot water obtained in the solar hot water generation operation on the next day, the process proceeds to step S7. Moreover, when there is no unused high temperature water, it transfers to step S7, without passing through step S6.

  In step S7, based on the temperature and amount of the solar hot water predicted in step S4, the target value of the temperature and amount of hot water stored in the nighttime hot water storage operation is calculated, and the process proceeds to step S8. In step S8, nighttime hot water storage operation is started, and the process proceeds to step S9. In step S9, actuators such as the compressor 41, the expansion valve 42, and the circulation pump 45 are driven, and the process proceeds to step S10.

  In step S10, heat is exchanged between the refrigerant and the water guided from the hot water storage tank 40 by the condensation heat exchanger 43 by driving the actuator, and heat is exchanged between the outside air and the refrigerant by the evaporative heat exchanger 44 to heat the water ( The target temperature set in step S7 is heated to 60 ° C., for example, and the process proceeds to step S11. In the first embodiment, operation control of each actuator is performed based on the measurement results of the pre-heating temperature detection means 60 and the post-heating temperature detection means 61.

  In step S11, it is determined whether or not the amount of generated high-temperature water has reached the target value calculated in step S7. When the amount of the generated high-temperature water reaches the target value, the process proceeds to step S12. In step S12, the nighttime hot water storage operation is terminated. If the amount of generated high-temperature water does not reach the target value in step S11, the process proceeds to step S9, and the nighttime hot water storage operation is continued until the amount of generated high-temperature water reaches the target value. If the hot water supply load on the next day is smaller in step S6, the hot water storage operation is not started and the routine proceeds to step S12 and the control shown in FIG. 3 is terminated.

  The control related to the solar hot water generation operation and the hot water storage operation shown in FIG. 4 is performed in a predetermined daytime period (generally, a daytime electricity rate is set and the electricity rate is higher, for example, from 7:00 am to afternoon 23:00). First, in step S13, it is determined whether or not the amount of heat stored in the hot water storage tank 40 at the present time, that is, when the nighttime hot water storage operation is finished, is greater than the daily hot water supply load. When the present heat storage amount in the hot water storage tank 40 is smaller than the daily hot water supply load, the routine proceeds to step S14.

  In step S14, based on the temperature and amount of solar hot water that can be generated predicted in step S4, the target value of the temperature and amount of solar hot water generated in the daytime solar hot water generation operation is calculated, and the process proceeds to step S15. . In step S15, the daytime solar hot water generation operation is started based on the target value calculated in step S14, and the process proceeds to step S16. In step S16, an actuator such as the circulation pump 47 is driven, and the process proceeds to step S17.

  In step S17, the hot water generation operation is performed by circulating the water guided from the hot water storage tank 40 by driving the actuator to the heat collector 46b of the solar thermal hybrid PV panel 46, and then proceeds to step S18. To do. In the first embodiment, operation control of each actuator is performed based on the measurement result of the solar hot water temperature detection means 66.

  In step S18, it is determined whether or not the amount of generated solar hot water has reached the target value calculated in step S14, or whether or not a preset sunshine time period has ended. When the amount of generated solar hot water reaches the target value, or when the sunshine time period ends, the process proceeds to step S19. In step S19, the solar hot water generation operation is terminated, and the process proceeds to step S20. In step S18, when the amount of generated solar hot water has not reached the target value and the sunshine time zone has not ended, the process proceeds to step S16, and the amount of generated solar hot water is Continue the solar hot water generation operation until the target value is reached.

  In step S20, it is determined whether or not the amount of heat obtained in the nighttime hot water storage operation and daytime solar hot water generation operation is greater than the daily hot water supply load, that is, whether or not the amount of heat that can cover the daily hot water supply load is obtained. If the amount of heat obtained by nighttime hot water storage operation and daytime solar hot water generation operation is smaller than the daily hot water supply load, that is, if the daily hot water supply load cannot be covered, the process proceeds to step S21. In step S21, the target value of the temperature and amount of high-temperature water stored in the hot water storage operation during the day is calculated in order to compensate for the shortage of the hot water supply load for one day, and the process proceeds to step S22. In step S22, daytime hot water storage operation is started, and the process proceeds to step S23. In step S23, actuators such as the compressor 41, the expansion valve 42, and the circulation pump 45 are driven, and the process proceeds to step S24.

  In step S24, heat is exchanged between the refrigerant and the water introduced from the hot water storage tank 40 by the condensation heat exchanger 43 by driving the actuator, and heat is exchanged between the outside air and the refrigerant by the evaporating heat exchanger 44 to heat the water ( The target temperature set in step S21 is heated to 60 ° C., for example, and the process proceeds to step S25. In the first embodiment, operation control of each actuator is performed based on the measurement results of the pre-heating temperature detection means 60 and the post-heating temperature detection means 61.

  In step S25, it is determined whether the amount of generated high-temperature water has reached the target value calculated in step S21. When the amount of the generated high-temperature water reaches the target value, the process proceeds to step S26. In step S26, the daytime hot water storage operation is terminated. In step S25, if the amount of the generated high-temperature water has not reached the target value, the process proceeds to step S23, and the daytime hot water storage operation is continued until the amount of the generated high-temperature water reaches the target value. When the hot water supply load is smaller than the amount of heat stored in the hot water storage tank 40 in step S13, the process proceeds to step S26 without starting the daytime solar hot water generation operation and hot water storage operation, and is shown in FIG. End control. Further, in the case where the hot water supply load is compared with the amount of heat obtained in the nighttime hot water storage operation and the daytime solar hot water generation operation in step S20, the process proceeds to step S26 without starting the daytime hot water storage operation. The control shown in FIG.

  In Embodiment 1, as described above, by controlling the hot water storage operation at night and the solar hot water generation operation in the daytime, the ratio of solar energy utilization of hot water stored in the hot water storage tank 40 can be improved. In addition, when the hot water is discharged, the hot water in the middle temperature layer in the hot water storage tank 40 is preferentially discharged and used as described above, so that the lower part of the hot water storage tank 40 flows in from the water supply pipe 71 during the hot water storage operation at night. Cold water accounts for the majority. For this reason, when heat is exchanged between the refrigerant and water in the condensation heat exchanger 43, the temperature difference becomes large, so that the amount of heat exchange can be increased.

  Moreover, in this Embodiment 1, based on the weather forecast information collected by the weather forecast information collection means 20, the temperature and quantity of the solar hot water which can be produced | generated by the solar hot water production | generation operation in the daytime can be estimated accurately. Further, in the first embodiment, the hot water storage tank for storing high-temperature water and the hot water storage tank for storing solar hot water are not divided separately, but are shared by one hot water storage tank 40. For this reason, it is low-cost and installation space can be reduced.

  In the present invention, as described below, based on the relationship between the high temperature water temperature and the operation efficiency in the nighttime hot water storage operation, and the relationship between the high temperature water temperature and the amount of solar hot water available on the next day, You may control the temperature and quantity of the high temperature water produced | generated by the hot water storage operation at night so that the power consumption as the whole system may become small. If the hot water temperature of the hot water storage operation at night is set high (for example, the setting value is changed from 60 ° C. to 70 ° C.), in the operation using the outside air at night as the heat source, the high pressure side and low pressure side of the refrigeration cycle using the refrigerant Since the temperature difference increases, the operating efficiency decreases. For example, when the operation efficiency when the high-temperature water temperature is 60 ° C. is used as a reference, the operation efficiency decreases by about 10% when the high-temperature water temperature is 70 ° C., and the operation efficiency decreases by about 20% when the high-temperature water temperature is 80 ° C. .

  Here, as an example, assuming that the hot water supply load is 40 ° C., 420 L, and the predicted result of the temperature and amount of solar hot water that can be generated the next day is 20 ° C., 300 L, the hot water temperature of the hot water storage operation at night is 60 ° C. In this case, 210 L of high-temperature water is generated and 210 L of solar hot water is generated and used. On the other hand, when the high-temperature water temperature for nighttime hot water storage operation is 70 ° C., 168 L of high-temperature water is generated and 252 L of solar hot water is generated and used, so that the operating efficiency is reduced by about 10%. The amount of hot water produced is reduced by about 20%. In addition, when the hot water temperature of the hot water storage operation at night is set to 80 ° C., 140 L of hot water is generated and 280 L of solar hot water is generated and used, so that the operation efficiency is reduced by about 20%. The amount of hot water produced is reduced by about 33%. As described above, the operation efficiency decreases as the high-temperature water temperature is set higher, but the amount of solar hot water that can be used increases. As a result, the amount of high-temperature water that can be generated can be reduced, resulting in a reduction in power consumption. it can. Therefore, in this case, the high temperature water temperature in the hot water storage operation at night may be set high, and the high temperature water generation amount may be set small. Thereby, although the operating efficiency of the hot water storage operation is lowered, the power consumption can be reduced as a whole system. In addition, since the amount of heat release from the outside air is increased by increasing the high-temperature water temperature, it is desirable to perform operation control in consideration of this point.

  Some conventional hybrid hot water supply systems include a first hot water storage tank for storing high-temperature water by hot water storage operation and a second hot water storage tank for storing solar hot water. In this case, the temperature of the high-temperature water in the first hot water storage tank can be arbitrarily operated so as to be approximately 60 ° C. or higher at which Legionella bacteria can be sterilized. Or the period which stores high temperature water in a 1st hot water storage tank can be made into a short period. However, about the 2nd hot water storage tank, it may be unable to be about 60 ° C or more which can sterilize Legionella bacteria by the demand of the weather, the season, and the load side. Or the solar hot water in a 2nd hot water storage tank may be stored for a long period of time. On the other hand, in the first embodiment, as described above, in response to the weather, season, and load-side requirements, operation control is performed so that the generated solar hot water is completely used in a short period of time, and the hot water storage tank 40 The warm water of less than about 60 ° C. is not stored therein for a long period of time, so that the growth of Legionella can be reliably suppressed.

  Moreover, in this Embodiment 1, when there is solar radiation in a sunshine time zone, the solar thermal hybrid PV panel 46 generates electric power depending on the solar radiation amount and the panel temperature. That is, the amount of power generation increases as the amount of solar radiation increases, and the amount of power generation increases as the panel temperature decreases. Therefore, the heat of the solar thermal hybrid PV panel 46 is radiated to the solar hot water by performing the solar hot water generation operation in the daytime, so that the temperature of the panel is lowered, so that a larger amount of power generation can be obtained with the same amount of solar radiation. it can.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. 5. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted.

  FIG. 5 is a configuration diagram showing a hybrid hot water supply system according to Embodiment 2 of the present invention. The hybrid hot water supply system 10 of the second embodiment shown in FIG. 5 is the same as that of the first embodiment except that a solar water heater 75 is provided instead of the solar heat hybrid PV panel 46. According to the solar water heater 75, higher-temperature solar water can be generated. For this reason, according to this Embodiment 2, since the ratio which covers hot water supply load with solar hot water can be improved, the ratio of nighttime hot water storage operation can be reduced, and the power consumption by nighttime hot water storage operation can be further reduced. Moreover, since the solar water heater 75 can be used at a lower cost than the solar heat hybrid PV panel 46, the hybrid hot water supply system 10 can be configured at a lower cost than the first embodiment.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to FIG. 6. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted.

  FIG. 6 is a configuration diagram illustrating a hybrid hot water supply system according to Embodiment 3 of the present invention. As shown in FIG. 6, the solar energy utilization system 2 (solar hot water generation means) in the hybrid hot water supply system 10 of the third embodiment has a configuration similar to that of the first embodiment, a heat exchanger 48, and a circulation A pump 49, a pipe 57, and a heat medium temperature detecting means 67 are provided. In the third embodiment, a heat medium other than hot water supply water is circulated in the heat collector 46b of the solar heat hybrid PV panel 46. As the heat medium, for example, an antifreeze such as propylene glycol is preferable. The heat exchanger 48 exchanges heat between the heat medium heated by the solar heat hybrid PV panel 46 and the water guided from the hot water storage tank 40. The heat medium is sent from the heat exchanger 48 to the heat collector 46 b of the solar heat hybrid PV panel 46 through the heat collecting pipe 55 by the circulation pump 47. The heat medium heated by the heat collector 46 b of the solar heat hybrid PV panel 46 is sent to the heat exchanger 48 through the heat collecting return pipe 56. The heat medium temperature detecting means 67 detects the temperature of the heat medium passing through the heat collecting return pipe 56. The water in the hot water storage tank 40 is returned to the hot water storage tank 40 by the circulation pump 49 through the pipe 57, the heat exchanger 48, and the solar hot water.

  In the third embodiment, when the solar hot water generation operation is carried out, the circulation pumps 47 and 49 are operated and controlled based on the measured values of the solar hot water temperature detection means 66 and the heat medium temperature detection means 67, so that the hot water storage The temperature of the solar hot water stored in the tank 40 is controlled.

  According to the third embodiment, the heat medium other than the hot water supply water is circulated in the solar heat hybrid PV panel 46 to prevent the heat medium in the pipe from freezing even in a stationary state in winter. be able to. In addition, regarding Embodiment 1 and 2 mentioned above, freezing of piping can be prevented by operating the circulation pump 47 intermittently.

DESCRIPTION OF SYMBOLS 1 Heat pump hot water supply system, 2 Solar energy utilization system, 10 Hybrid hot water supply system, 20 Weather forecast information collection means, 30 Control means, 40 Hot water storage tank, 41 Compressor, 42 Expansion valve, 43 Condensation heat exchanger, 44 Evaporation heat exchanger , 45, 47, 49 Circulating pump, 46 Solar thermal hybrid PV panel, 46a Photovoltaic power generation panel, 46b Heat collector, 48 Heat exchanger, 50 Pre-heating piping, 51 Return piping after heating, 52 Hot water tap piping, 53 High-temperature water tapping piping, 54 tapping piping, 55 heat collection piping, 56 return piping for heat collection, 57 piping, 60 pre-heating temperature detection means, 61 post-heating temperature detection means, 62 high-temperature water tapping temperature detection means, 63 hot water Hot water temperature detection means, 64 Hot water temperature detection means, 65 Outside air temperature detection means, 66 Solar hot water temperature Knowledge means, 67 heat medium temperature detecting means, 70 fan, 71 and 72 feed water pipe, 75 solar water heaters, 100 network system, 200 server

Claims (5)

Heating means for heating the water to produce hot water;
Solar hot water generating means for heating solar water to generate solar hot water;
Hot water storage means for storing the high temperature water and the solar hot water,
A predicting means for predicting a relationship between the amount or heat amount of the solar hot water that can be generated and the temperature of the solar hot water;
Based on the required temperature and amount of hot water, a calculation means for obtaining a relationship between the amount or amount of the solar hot water available and the temperature of the solar hot water;
Control means for controlling the temperature of the solar hot water generated by the solar hot water generation means based on the first relation predicted by the prediction means and the second relation obtained by the calculation means;
Hybrid hot water supply system with The first relationship is a relationship in which the amount or heat amount of the solar hot water that can be generated decreases as the temperature of the solar hot water increases.
The second relationship is a relationship in which the amount of solar heat water available or the amount of heat increases as the temperature of the solar hot water increases.
The control means uses the solar hot water generation means based on the temperature of the solar hot water such that the amount or heat quantity of the solar hot water that can be generated is equal to the amount or heat quantity of the available solar hot water. The hybrid hot water supply system according to claim 1, wherein the temperature of the generated solar hot water is controlled.   In addition to the first relationship and the second relationship, the control means is a temperature of the solar hot water generated by the solar hot water generation means based on a capacity of the solar hot water that can be stored in the hot water storage means. The hybrid hot-water supply system of Claim 1 or 2 which controls.   The control means determines one or both of the temperature and the amount of hot water generated by the heating means at night based on a prediction result of the temperature and amount of the solar hot water that can be generated by the solar hot water generation means on the next day. The hybrid hot water supply system according to any one of claims 1 to 3, which is controlled.   Based on the relationship between the high-temperature water temperature and the operating efficiency of the heating means and the relationship between the high-temperature water temperature and the amount of the solar hot water available on the next day, the control means reduces power consumption as a whole system. Furthermore, the hybrid hot-water supply system of Claim 4 which controls the temperature and quantity of the high temperature water which the said heating means produces | generates at night.

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