Hot water supply method, system and program

Abstract

To enhance use efficiency of accumulated heat in a hot water storage tank and enable hot water supply corresponding to a hot water supply demand.SOLUTION: In a hot water supply method for a hot water supply system (2) including first hot water supply means (4, 72) for supplying hot water heated by first heat sources (10, 74) and stored in a hot water storage tank (tank unit 12) and second hot water supply means (multi-water heater 6) that uses hot water heated by second heat sources (gas water heaters 24-1, 24-2) for hot water supply, control sections (14, 82) of the first hot water supply means monitor a heat accumulation temperature on the basis of a detection temperature from a temperature sensor (22) installed at a predetermined height position in the hot water storage tank during hot water delivery from the first hot water supply means, decrease a hot water delivery temperature and hot water delivery amount on the first hot water supply means side when the heat accumulation temperature in the hot water storage tank becomes lower than a set temperature of a hot water supply request, set a hot water delivery condition for causing a hot water delivery temperature on the second hot water supply means side to become higher than that of the hot water supply request, and generate a hot water delivery instruction including the hot water delivery temperature and hot water delivery amount on the first hot water supply means side and the hot water delivery temperature on the second hot water supply means side that enable hot water supply corresponding to the hot water supply request.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to, for example, a hot water supply method, system, and program that combine a hot water supply means for storing pre-heated hot water in a hot water storage tank by a heat source and a hot water supply means for heating cold water to generate hot water during hot water supply.

Background Art

[0002] Hybrid hot water supply systems that combine a hot water supply means including a heat pump and a hot water storage tank and a hot water supply means including a heat source other than the heat pump are already known. As a heat source means other than the heat pump, a multi-hot water supply system equipped with a plurality of gas water heaters is known.

[0003] This hybrid hot water supply system is known to be provided with auxiliary hot water supply means as a heat source for gas burning or oil burning directly or indirectly in the hot water supply forward path from the hot water storage tank to the hot water supply load (for example, Patent Document 1).

[0004] In such a hot water supply system, when the hot water supply set temperature is decreased during the heating operation of the auxiliary heat source device, the target temperature is lowered so that the temperature difference between the hot water supply set temperature and the target temperature before the decrease is maintained even after the decrease (for example, Patent Document 2).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] Incidentally, in a hybrid water supply system that combines a water supply means including a hot water storage tank for storing hot water heated by a heat source and a water supply means (or a multi-water supply system) that heats water to generate hot water during water supply, for example, an HP water heater including a heat pump (HP) and a hot water storage tank, and a water heater using a gas boiler (GB) as a heat source other than the heat pump, is equipped with a GB water heater, and it is possible to select and supply hot water by operating the HP water heater or the GB water heater alone, or by operating the HP water heater and the GB water heater in combination.

[0007] The HP water heater is equipped with a hot water storage tank, and stores and accumulates the hot water generated by the HP in the tank unit. Drawing hot water from the hot water storage tank can utilize the heat storage amount, which is beneficial. Whether the heat storage amount of the hot water storage tank cannot be increased or can be increased, if the heat storage consumption amount due to drawing hot water is large compared to the heat storage amount, the temperature of the drawn hot water will decrease. Also, even in the combined operation of the HP water heater and the GB water heater, if the heat storage consumption amount exceeding the heat storage amount in the tank unit is set, the temperature of the drawn hot water will similarly decrease.

[0008] On the other hand, if the burden ratio of the GB water heater is made too large, there is a problem that the significance of installing the HP water heater is impaired.

[0009] The inventor of the present disclosure has obtained the knowledge that realizing the balanced utilization of the HP water heater and the GB water heater according to the heat storage state and the total amount of hot water supply (total amount of drawn hot water) is beneficial for improving the utilization efficiency of the heat storage of the hot water storage tank.

[0010] Therefore, an object of the present disclosure is to improve the utilization efficiency of the heat storage of the hot water storage tank and realize hot water supply corresponding to the hot water supply demand.

Means for Solving the Problem

[0011] In order to achieve the above object, according to one aspect of the hot water supply method of the present disclosure, there is provided a hot water supply method for a hot water supply system including a first hot water supply means for supplying hot water using hot water heated by a first heat source and stored in a hot water storage tank, and a second hot water supply means for supplying hot water with hot water heated by a second heat source, wherein a control unit of the first hot water supply means monitors the heat storage temperature in the hot water storage tank based on a detected temperature of a temperature sensor installed at a predetermined height position in the hot water storage tank, at least while hot water is being discharged from the first hot water supply means; when the heat storage temperature becomes lower than a set temperature of a hot water supply request, the control unit sets a hot water discharge condition for reducing the hot water discharge temperature and the hot water discharge amount on the first hot water supply means side and increasing the hot water discharge temperature on the second hot water supply means side to a temperature higher than the set temperature of the hot water supply request, and generates a hot water discharge instruction including the hot water discharge temperature and the hot water discharge amount on the first hot water supply means side and the hot water discharge temperature of the second hot water supply means that enable hot water supply according to the hot water supply request according to the hot water discharge condition; and the control unit transmits the hot water discharge instruction to the first hot water supply means and the second hot water supply means.

[0012] In the above hot water supply method, the control unit calculates a mixing temperature using the hot water discharge temperature on the first hot water supply means side set according to the hot water discharge amount on the first hot water supply means side included in the hot water discharge condition and the heat storage temperature, and the hot water discharge amount on the second hot water supply means side and the hot water discharge temperature on the second hot water supply means side included in the hot water discharge condition, and generates the hot water discharge instruction such that the mixing temperature becomes the same value as or within a certain range including the set temperature of the hot water supply request. In the above hot water supply method, the control unit sets the hot water discharge temperature on the first hot water supply means side within a range of the set temperature of the hot water supply request and a heat storage regulation temperature condition, and when the calculated mixing temperature and the set temperature of the hot water supply request are not the same value or within a certain range as a result of comparison, adjusts either or both of the hot water discharge temperature and the hot water discharge amount on the first hot water supply means side. In the above hot water supply method, the control unit calculates the hot water discharge temperature on the first hot water supply means side based on the hot water discharge amount and the hot water discharge temperature on the second hot water supply means side, the set temperature of the hot water supply request, and the total hot water discharge amount, and based on the hot water discharge amount on the first hot water supply means side reduced to a predetermined range.

[0013] To achieve the above object, according to one aspect of the hot water supply system of the present disclosure, there is provided a hot water supply system including: a first hot water supply means for supplying hot water using hot water heated by a first heat source and stored in a hot water storage tank; and a second hot water supply means for supplying hot water with hot water heated by a second heat source, the hot water supply system further including: a temperature detection means for detecting the temperature at a predetermined height position in the hot water storage tank; a flow rate monitoring means for monitoring the total hot water supply amount required for hot water supply; and at least during hot water supply from the first hot water supply means, monitoring the heat storage temperature in the hot water storage tank based on the detected temperature of the temperature detection means, and when the heat storage temperature becomes lower than the set temperature required for hot water supply, setting a hot water supply condition for reducing the hot water supply temperature and the hot water supply amount on the first hot water supply means side, and increasing the hot water supply temperature on the second hot water supply means side to a temperature higher than the set temperature required for hot water supply, and a control means for generating a hot water supply instruction including the hot water supply temperature and the hot water supply amount on the first hot water supply means side and the hot water supply temperature of the second hot water supply means that enables hot water supply according to the hot water supply requirement according to the hot water supply condition.

[0014] In the above hot water supply system, the control means calculates a mixing temperature using the hot water supply temperature on the first hot water supply means side set according to the hot water supply amount on the first hot water supply means side and the heat storage temperature included in the hot water supply condition, and the hot water supply amount on the second hot water supply means side and the hot water supply temperature on the second hot water supply means side included in the hot water supply condition, and generates the hot water supply instruction such that the mixing temperature becomes the same value as the set temperature required for hot water supply or within a certain range including the same value. In the above hot water supply system, the control means sets the hot water supply temperature on the first hot water supply means side within the range of the set temperature required for hot water supply and the heat storage regulation temperature condition, and when the calculated mixing temperature and the set temperature required for hot water supply are not the same value or within a certain range as a result of comparison, adjusts either one or both of the hot water supply temperature and the hot water supply amount on the first hot water supply means side. In the above hot water supply system, the control means calculates the hot water supply temperature on the first hot water supply means side based on the hot water supply amount and the hot water supply temperature on the second hot water supply means side, the set temperature required for hot water supply, and the total hot water supply amount, and based on the hot water supply amount on the first hot water supply means side reduced to a predetermined range. In the above-described hot water supply system, the first heat source of the first hot water supply means uses air heat using a heat pump or solar heat using a solar collector, and the second heat source of the second hot water supply means uses heat generated by burning fuel gas.

[0015] To achieve the above object, according to one aspect of the program of the present disclosure, there is provided a program for a computer of a hot water supply system including a first hot water supply means for supplying hot water using hot water stored in a hot water storage tank heated by a first heat source, and a second hot water supply means for supplying hot water with hot water heated by a second heat source, the program causing the computer to execute functions of detecting, by temperature detection means, the temperature at a predetermined height position in the hot water storage tank, monitoring, by flow rate monitoring means, the total hot water supply amount of a hot water supply request, monitoring, at least while hot water is being discharged from the first hot water supply means, the heat storage temperature in the hot water storage tank based on the detected temperature of the temperature detection means, setting, when the heat storage temperature becomes lower than the set temperature of the hot water supply request, a hot water discharge condition for reducing the hot water discharge temperature and the hot water discharge amount on the first hot water supply means side and increasing the hot water discharge temperature on the second hot water supply means side to a temperature higher than the set temperature of the hot water supply request, and generating a hot water discharge instruction including the hot water discharge temperature and the hot water discharge amount on the first hot water supply means side and the hot water discharge temperature of the second hot water supply means that enable hot water supply according to the hot water supply request according to the hot water discharge condition.

[0016] In the above program, the computer is caused to execute a function of calculating a mixing temperature using the hot water discharge amount on the first hot water supply means side included in the hot water discharge condition and the hot water discharge temperature on the first hot water supply means side set according to the heat storage temperature, and the hot water discharge amount on the second hot water supply means side and the hot water discharge temperature on the second hot water supply means side included in the hot water discharge condition, and generating the hot water discharge instruction such that the mixing temperature falls within the same value or a certain range including the same value as the set temperature of the hot water supply request. In the above program, the hot water discharge temperature on the first hot water supply means side is set within the range of the set temperature of the hot water supply request and the heat storage regulation temperature condition, and when the calculated mixing temperature and the set temperature of the hot water supply request are not within the same value or a certain range as a result of comparison, the computer is caused to execute a function of adjusting either or both of the hot water discharge temperature and the hot water discharge amount on the first hot water supply means side. In the above program, the computer is caused to execute a function of calculating the hot water outlet temperature on the first hot water supply means side based on the hot water outlet amount and the hot water outlet temperature on the second hot water supply means side, and the set temperature and the total hot water outlet amount of the hot water supply request, and based on the hot water outlet amount on the first hot water supply means side reduced to a predetermined range.

Effect of the Invention

[0017] According to the technology of the present disclosure, any of the following effects can be obtained.

[0018] (1) By improving the utilization rate of the heat storage in the tank unit, the hot water supply efficiency can be increased. (2) When the heat storage temperature in the tank unit becomes lower than the set temperature of the hot water supply request, the hot water outlet amount from the first hot water supply means side is reduced and hot water is discharged at a temperature lower than the set temperature of the hot water supply request, and by using the second hot water supply means in addition, the heat storage in the tank unit can be effectively utilized and hot water can be supplied according to the hot water supply request. Furthermore, by discharging hot water from the tank unit side at a temperature lower than the set temperature of the hot water supply request and reducing the hot water outlet amount, it is possible to make it less susceptible to the influence of fluctuations in the total hot water outlet amount of the hot water supply request. (3) By quickly switching the hot water supply operation using the second hot water supply means in response to fluctuations in the heat storage state in the tank unit of the first hot water supply means, it is possible to suppress the occurrence of fluctuations in the hot water outlet amount and the hot water outlet temperature to the hot water supply load side.

Brief Description of the Drawings

[0019]

Figure 1

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Figure 12

Mode for Carrying Out the Invention

[0020] 〔First Embodiment〕 FIG. 1 shows a hot water supply system according to a first embodiment of the present disclosure. The configuration shown in FIG. 1 is an example, and the technology of the present disclosure is not limited to such a configuration.

[0021] This hot water supply system 2 includes, for example, as shown in FIG. 1, a heat pump (HP) water heater 4 (hereinafter referred to as "HP water heater 4"), a multi water heater 6 including two or more gas water heaters, a remote control device (hereinafter abbreviated as "remote control") 8, etc., and constitutes a multi hybrid hot water supply system used for hot water supply services including stored hot water supply.

[0022] <HP water heater 4> The HP water heater 4 uses a heat pump as the first heat source and includes a hot water storage tank that stores heat with the hot water heated by the heat of this heat source, and is an example of the first water supply means of the present disclosure. This HP water heater 4 includes a heat pump unit 10 (hereinafter simply referred to as "HP unit 10"), a hot water storage tank unit (hereinafter simply referred to as "tank unit") 12, and an HP control unit 14. In addition, this HP water heater 4 is provided with means for controlling the hot water outlet temperature and the hot water outlet amount, such as a bypass pipeline and flow path switching means (not shown in the figure).

[0023] The HP unit 10 and the tank unit 12 are provided with a circulation path 16, water is supplied from the lower layer part of the tank unit 12 to the HP unit 10, and hot water HW is supplied from the HP unit 10 to the upper layer part of the tank unit 12.

[0024] A water supply circuit 18 and a hot water supply circuit 20 are connected to the tank unit 12. During hot water supply, the tank unit 12 supplies make-up water W to the lower layer part of the tank unit 12 through the water supply circuit 18, and hot water HW flows out from the upper layer part of the tank unit 12 to the hot water supply circuit 20. The make-up water W to the water supply circuit 18 uses city water such as tap water. In addition, in this water supply circuit 18, for example, near the water intake part on the bottom side of the tank unit 12, there is a bypass pipe that branches a part of the make-up water W and bypasses the tank unit 12 to flow to the hot water supply circuit 20 side, and a distribution valve that controls the amount of make-up water flowing to the bypass pipe and the tank unit 12 side, etc.

[0025] The HP unit 10 is provided with a heat pump circuit as a heat source. The heat pump circuit uses, for example, CO 2Using this, heat dissipation from the condenser and the feed water are heat-exchanged. In this HP water heater 4, the feed water W or the low-temperature hot water HW taken out from the lower layer part of the tank unit 12 is heat-exchanged with the heat dissipation from the condenser and heated, and the hot water HW heated up by this heat exchange is returned to the upper layer part of the tank unit 12. Therefore, the tank unit 12 performs so-called temperature stratification type heat storage in a stratified state where it is high temperature in the upper layer part and low temperature in the lower layer part. The tank unit 12 is provided with a temperature sensor 22 at least at a predetermined height position on the upper layer side, and the heat storage temperature of the hot water HW stored inside is detected. Also, the tank unit 12 may be provided with a plurality of temperature sensors with different installation heights, for example, in order to monitor the stratified state of the hot water inside.

[0026] The HP control unit 14 is an example of the control unit of the present disclosure, constitutes the control unit of the master unit for the multi water heater 6, and performs heat storage control of the HP water heater 4 included in the hot water supply system 2, hot water supply control of the HP water heater 4, cooperative control by the HP water heater 4 and the multi water heater 6, etc.

[0027] The HP control unit 14 is composed of a computer having a communication function, and includes a processing unit, a storage unit, an input / output unit, etc. The processing unit, by executing the OS (Operating System) stored in the storage unit and the hot water supply control program of the present disclosure, etc., acquires input information from the remote control 8, heat storage information such as the detected temperature of the temperature sensor 22, calculates the hot water supply temperature, performs hot water supply control described later, cooperative control with the multi water heater 6, etc. The storage unit stores the OS and the hot water supply control program. This hot water supply control program includes a database for storing temperature information such as heat storage temperature, hot water supply temperature, set temperature, flow rate information of the hot water HW and the feed water W, calculation result information of the mixing temperature.

[0028] The heat storage control of the HP water heater 4 monitors the heat storage temperature of the tank unit 12 by obtaining temperature information from the temperature sensor 22 arranged in the upper layer of the tank unit 12, obtains flow rate information from the flow rate sensor 25 arranged on the hot water outlet side of the tank unit 12, and performs heat storage control using the hot water of the tank unit 12. Further, the HP water heater 4 detects the flow rate of the feed water W flowing through the feed water circuit 18 with the flow rate sensor 23, grasps the total hot water output required for the hot water supply system 2, determines the hot water supply capacity according to the heat storage state of the tank unit 12, and performs hot water supply control. Alternatively, the HP control unit 14 may calculate the total hot water output of the hot water supply system 2 by, for example, adding the hot water output from the HP water heater 4 detected by the flow rate sensor 25 and the flow rates detected by the flow rate sensors 52-1 and 52-2 (Fig. 2) installed in the gas water heaters 24-1 and 24-2. Then, the HP control unit 14 may perform hot water supply control based on the calculated total hot water output and the hot water supply capacity according to the heat storage state of the tank unit 12. The hot water output in this hot water supply control is specified by the flow rate of the hot water discharged from the HP water heater 4 or the multi water heater 6, the hot water flowing through the circuit, and other hot water flowing through the hot water supply load. Furthermore, in the hot water supply control, for example, the HP control unit 14 adjusts the opening degree of a distribution valve (not shown) to control the hot water output temperature from the HP water heater 4 according to the ratio of the flow rate flowing from the feed water circuit 18 into the tank unit 12, that is, the flow rate of hot water discharged from the tank unit 12, and the flow rate flowing from the feed water circuit 18 through a bypass path (not shown) into the hot water supply circuit 20.

[0029] The coordinated control by the HP water heater 4 and the multi water heater 6 is performed with the HP water heater 4 as the master water heater and the multi water heater 6 as the slave water heater. This coordinated control includes the control of hot water output (single operation mode) by the single operation of either the HP water heater 4 or the multi water heater 6, and the control of hot water output (combined operation mode) by the combined operation of the HP water heater 4 and the multi water heater 6.

[0030] In this control, if the heat storage temperature of the tank unit 12 is equal to or higher than a predetermined value and the hot water output from the HP water heater 4 is equal to or lower than a predetermined value, the single mode of the HP water heater 4 is selected. If the heat storage temperature of the tank unit 12 is lower than the predetermined value, the single mode of the multi water heater 6 is selected. Also, when the heat storage temperature of the tank unit 12 is equal to or higher than the predetermined value and the hot water output from the HP water heater 4 exceeds the predetermined value, the combined mode of the HP water heater 4 and the multi water heater 6 is selected.

[0031] The combined mode of the HP water heater 4 and the multi water heater 6 includes processes such as monitoring the heat storage temperature of the tank unit 12, monitoring the regulated flow rate of the HP water heater 4, calculating the mixing temperature based on the hot water temperatures of the HP water heater 4 and the multi water heater 6, monitoring the mixing temperature with the set hot water target temperature (set temperature) set in the remote controller 8 as the reference value, controlling the hot water output of the HP water heater 4 and the multi water heater 6, and controlling the hot water temperature of the HP water heater 4.

[0032] <Multi water heater 6> The multi water heater 6 is an example of the second hot water supply means of the present disclosure that generates hot water during hot water supply by burning fuel gas as the second heat source and heating water with the combustion exhaust. This multi water heater 6 is not limited to, for example, those that burn fuel gas as the heat source, and may be any device that uses a heat source other than a heat pump and can generate hot water during hot water supply. This multi water heater 6 is composed of, for example, a pair of gas water heaters 24-1 and 24-2. These gas water heaters 24-1 and 24-2 are provided with hot water supply control units 26-1 and 26-2, which perform hot water supply control based on the hot water supply flow rate and the set temperature. The multi water heater 6 is configured such that, for example, the hot water supply control unit 26-1 is connected to the HP control unit 14 of the HP water heater 4 and is also connected to the hot water supply control unit 26-2, with the HP water heater 4 set as the master unit and the gas water heaters 24-1 and 24-2 set as slave units. Then, the multi water heater 6 performs hot water supply processing by the gas water heaters 24-1 and 24-2 according to instructions from the HP control unit 14, which is the control means of the master unit. Also, the multi water heater 6 may be composed of, for example, a single gas water heater 24-1, or may constitute a multi water heater system with two or more gas water heaters 24-1, 24-2, ··· installed together.

[0033] Each gas water heater 24-1, 24-2 is a device that supplies hot water to the hot water supply load side using, for example, a gas boiler (GB) that heats water using the combustion heat of gas as a heat source. The same or different gas water heaters can be used for each of the gas water heaters 24-1, 24-2, and the hot water output of the multi-water heater 6 is shared by the gas water heaters 24-1, 24-2. That is, the multi-water heater 6 supplies hot water using only one of the gas water heaters 24-1, 24-2 according to the hot water supply demand, or supplies hot water by interlocking both of them, for example, when operating alone or when supplying hot water in cooperation with the HP water heater 4.

[0034] The hot water supply control units 26-1, 26-2 are an example of the control unit of the present disclosure together with the HP control unit 14, and function as a control unit of a slave unit with respect to the HP control unit 14. The hot water supply control units 26-1, 26-2 are configured by a computer having a communication function similar to that of the HP control unit 14, and include a processing unit, a storage unit, an input / output unit, and the like.

[0035] The multi-water heater 6 performs hot water output control of each of the gas water heaters 24-1, 24-2, cooperation control for interlocking the gas water heaters 24-1, 24-2, etc. based on the hot water output control instructed from the HP control unit 14 set as the master unit of the hot water supply means. This hot water output control includes control of the hot water output temperature and the hot water output amount of each of the gas water heaters 24-1, 24-2. The cooperation control includes, for example, selecting the gas water heater 24-1 if the hot water output amount shared by the multi-water heater 6 in the hot water supply request to the hot water supply system 2 is less than the allowable hot water output amount of the gas water heater 24-1, and selecting the gas water heater 24-2 for the excess hot water output amount and sharing it when the allowable hot water output amount of the gas water heater 24-1 is exceeded.

[0036] <Remote controller 8> The remote controller 8 is connected to be able to transmit and receive control information to and from the HP control unit 14 which is the control unit of the master unit, and is used for remotely operating the HP control unit 14 and the hot water supply control units 26-1 and 26-2. A computer is installed in this remote controller 8, which communicates with the HP control unit 14 and performs various startup controls on the hot water supply control units 26-1 and 26-2 via the HP control unit 14, and sets the hot water supply target temperature (set temperature) of the hot water supply system 2. Further, the remote controller 8 may set the hot water outlet temperature and the hot water outlet amount of the HP control unit 14 and / or the hot water supply control units 26-1 and 26-2.

[0037] In addition, the hot water supply system 2 may include, for example, a temperature sensor 27 that detects the hot water outlet temperature to a hot water outlet load (not shown) on the hot water supply circuit 20 and downstream of the multi hot water heater 6. Thereby, the HP control unit 14 can monitor whether the hot water mixed by discharging hot water at the hot water supply flow rate and the hot water outlet temperature set for the HP hot water heater 4 and the multi hot water heater 6 respectively matches the set temperature of the hot water supply request or is within a predetermined range. And when the hot water outlet temperature detected by the temperature sensor 27 differs from the set temperature of the hot water supply request by a predetermined range or more, the HP control unit 14 may perform a correction process on the hot water supply control of the HP hot water heater 4 and the multi hot water heater 6.

[0038] <Regarding the control function of the hot water supply system 2> Figure 2 shows the configuration and cooperation function of the control unit of the hot water supply system. The configuration shown in Figure 2 is an example.

[0039] The HP control unit 14 is composed of, for example, a processor 30, a memory unit 32, a communication unit 34, and an input / output unit 36. The processor 30 functions as the processing unit of the hot water supply system 2 by executing the arithmetic processing of the OS and the hot water supply control program stored in the memory unit 32. The memory unit 32 functions not only as a storage unit for storing, for example, programs and detection values of the temperature sensors 22 and 27 and the flow rate sensors 23 and 25, but also as a work area for the processor 30 to execute arithmetic processing. The communication unit 34 is an example of a functional unit that transmits and receives information and control instructions to and from the remote controller 8 and the hot water supply control units 26-1. It may use any means such as wired, wireless, or other short-range infrared communication as long as communication processing is possible. The input / output unit 36 is an example of an interface that enables the transmission of control instructions or the reception of detection information between the functional units of the HP hot water supply machine 4. The input / output unit 36 receives detection information such as the detected temperature in the tank unit 12 from the temperature sensor 22, the water supply amount and the hot water output amount from the flow rate sensors 23 and 25, and the hot water output temperature from the temperature sensor 27. The input / output unit 36 also outputs, for example, the instruction for the heat storage operation generated by a processing unit such as the processor 30 to the HP unit 10 or a pump installed on a circulation path 16 (not shown).

[0040] The hot water supply control units 26-1 and 26-2 are each composed of, for example, processors 38-1 and 38-2, memory units 40-1 and 40-2, communication units 42-1 and 42-2, and input / output units 44-1 and 44-2. The processors 38-1 and 38-2 execute arithmetic processing of the OS and the hot water supply control program stored in the memory units 40-1 and 40-2. The memory units 40-1 and 40-2 function as a storage unit that stores, for example, programs, the incoming water temperature detected by the temperature sensors 46-1 and 46-2 installed in the gas water heaters 24-1 and 24-2, the temperature after heating detected by the temperature sensors 48-1 and 48-2, or the hot water output temperature detected by the temperature sensors 50-1 and 50-2, as well as the incoming water flow rate to the gas water heaters 24-1 and 24-2 detected by the flow rate sensors 52-1 and 52-2. They also function as a work area for the processors 38-1 and 38-2 to execute arithmetic processing. The communication units 42-1 and 42-2 are an example of a functional unit that transmits and receives information and control instructions to and from the remote controller 8 and the HP control unit 14. It may use any means such as wired, wireless, or other short-range infrared communication as long as communication processing is possible. The input / output units 44-1 and 44-2 are an example of an interface that enables the transmission of control instructions or the reception of detection information between each functional unit of the multi-boiler 6. The input / output units 44-1 and 44-2 are connected to, for example, the temperature sensors 46-1, 46-2, 48-1, 48-2, 50-1, and 50-2, and output combustion control instructions from the processors 38-1 and 38-2 to the heat source machines 51-1 and 51-2.

[0041] <Selection setting of hot water supply mode> Figure 3 shows the hot water supply modes by the hot water supply system 2. These hot water supply modes include a heat pump water heater single hot water supply mode (A in Figure 3), a hybrid hot water supply mode (B in Figure 3), and a multi-boiler single hot water supply mode (C in Figure 3), which are selected according to the heat storage and / or hot water supply amount of the tank unit 12.

[0042] In the heat pump water heater single hot water supply mode, for example, as shown in A of Figure 3, only the heat pump water heater 4 is operated to supply hot water corresponding to the hot water supply demand. At this time, the multi-boiler 6 is in a standby state, and the water supply W is supplied to the tank unit 12 of the heat pump water heater 4. The hot water HW pushed out from the tank unit 12 according to the supply amount of the water supply W is discharged from the heat pump water heater 4 at a set temperature or a temperature within a predetermined temperature range including the set temperature. Also, the heat pump water heater 4 during hot water supply performs a heat storage operation on the tank unit 12.

[0043] The hybrid hot water supply mode is a hot water supply operation process in which, for example, as shown in B of Figure 3, the heat pump water heater 4 and the multi-boiler 6 are operated to supply hot water corresponding to the hot water supply demand. At this time, the water supply W is supplied to both the multi-boiler 6 and the tank unit 12. The hot water discharged from the heat pump water heater 4 and the hot water discharged from the multi-boiler 6 merge in the hot water supply circuit 20, and hot water HW with a mixed temperature adjusted to a set temperature or within a certain range including the set temperature is discharged. In this example, only the gas water heater 24-1 is in an operating state, but when the hot water supply demand exceeds the hot water discharge capacity of the gas water heater 24-1, both the gas water heaters 24-1 and 24-2 are operated. Also, the heat pump water heater 4 during hot water supply performs a heat storage operation on the tank unit 12. This hybrid hot water supply mode includes a first hybrid hot water supply mode which is a hot water supply mode of heat storage high temperature control selected, for example, when the heat storage temperature in the HP water heater 4 is sufficiently high for a hot water supply request and the total required hot water supply volume is large, and a second hybrid hot water supply mode which is a hot water supply mode of heat storage low temperature control selected when the heat storage temperature in the HP water heater 4 is decreasing for a hot water supply request.

[0044] When the first hybrid hot water supply mode is set, the hot water supply system 2 controls, for example, for a hot water supply demand, to use the heat storage in the tank unit 12 for most of the hot water supply load, or at least more than half of the ratio, and let the multi water heater 6 bear the remaining load. The HP control unit 14 adjusts, for example, for a hot water supply demand, either one or both of the hot water supply volume and the hot water supply temperature of the HP water heater 4 to a predetermined ratio with respect to the hot water supply request temperature or the total hot water supply volume, and may perform hot water supply control on the multi water heater 6 side corresponding to the hot water supply volume or the hot water supply temperature on the HP water heater 4 side. In this way, the first hybrid hot water supply mode aims to improve the energy efficiency of the hot water supply system 2 by preferentially using heat storage.

[0045] When the second hybrid hot water supply mode is set, the hot water supply system 2 controls, for example, for a hot water supply demand, to adjust the hot water supply volume and the hot water supply temperature from the HP water heater 4 so as to use as much heat storage of the tank unit 12 with good energy efficiency as possible, and let the multi water heater 6 supply the insufficient part. In the hot water supply control of this HP water heater 4, for example, based on the heat quantity obtained from the temperature and flow rate of the hot water supply request and the hot water supply temperature and heat quantity that can be supplied by the tank unit 12, the hot water supply volume from the HP water heater 4 is reduced to a predetermined range and the hot water supply temperature is set to a temperature lower than the hot water supply request temperature, and control is performed to use as much heat storage of the tank unit 12 as possible.

[0046] In the single hot water supply mode of the multi - hot water supply device, for example, as shown in C of FIG. 3, only the multi - hot water supply device 6 operates, and hot water supply corresponding to the hot water supply demand is performed. At this time, the makeup water W is supplied only to the multi - hot water supply device 6, and the combustion heat of the gas by the multi - hot water supply device 6 is heat - exchanged with the makeup water W, and the hot water HW is discharged from the multi - hot water supply device 6 at a temperature of a set temperature or a predetermined temperature range including the set temperature. In this example, both the gas water heaters 24 - 1 and 24 - 2 are in an operating state. However, when the hot water supply demand can be met by either of the gas water heaters 24 - 1 and 24 - 2, only one of the gas water heaters 24 - 1 or 24 - 2 operates. At this time, the HP water heater 4 that is separated from the hot water supply operation normally operates the HP unit 10 and performs a heat storage operation on the tank unit 12.

[0047] <Hot water supply control> FIG. 4 shows an example of the processing of hot water supply control. The processing content and processing procedure shown in FIG. 4 are examples, and the technology of the present disclosure is not limited to such a configuration. This hot water supply control is an example of the hot water supply method or program of the present disclosure, and includes an upper layer temperature detection step (S101), a heat storage determination step (S102, S103), a hot water supply amount detection step (S104), a hot water supply amount determination step (S105), an HP water heater single hot water supply mode (S106), a first hybrid hot water supply mode (S107), a second hybrid hot water supply mode (S108), a multi - hot water supply device single hot water supply mode (S109), etc.

[0048] Upper layer temperature detection step (S101): The temperature sensor 22 detects the upper layer temperature of the tank unit 12 and transmits this upper layer temperature information to the HP control unit 14. The HP control unit 14 calculates the heat storage temperature of the tank unit 12 using the acquired temperature information and monitors its change.

[0049] Heat storage determination step (S102): The HP control unit 14 determines the calculated heat storage state. This heat storage determination determines whether the upper layer temperature of the tank unit 12 is higher than the threshold temperature which is the lower limit value. In this case, it is determined whether the temperature information acquired from the temperature sensor 22 installed at a predetermined height position of the tank unit 12 is within the temperature range suitable for hot water supply. Therefore, if the upper layer temperature of the tank unit 12 is below the threshold temperature (NO in S102) and there is no heat storage, it shifts to the multi water heater single hot water supply mode (S109), and if the upper layer temperature is higher than the threshold temperature (YES in S102) and there is heat storage, it executes the heat storage determination step (S103) for the hot water supply request.

[0050] Heat storage determination step (S103): As a determination of whether the hot water in the tank unit 12 is at a temperature capable of responding to the hot water supply request, the HP control unit 14 determines whether the temperature information acquired from the temperature sensor 22 is higher than the remote control set temperature which is the target temperature of the hot water supply request. If the upper layer temperature is lower than the remote control set temperature based on this determination (NO in S103), it shifts to the second hybrid hot water supply mode which is heat storage low temperature control as a state where there is no heat storage capable of supplying hot water alone in the tank unit 12 (S108). Also, if the upper layer temperature is higher than the remote control set temperature (YES in S103), it shifts to the detection of the hot water supply amount of the HP water heater 4 (S104).

[0051] Hot water supply amount detection step (S104): In this hot water supply amount detection step, the hot water supply amount of the hot water HW from the tank unit 12 is detected by the flow sensor 25, and the flow rate information is acquired by the HP control unit 14 from the flow sensor 25.

[0052] Hot water supply amount determination step (S105): The HP control unit 14 monitors the transition of the hot water supply amount of the HP water heater 4 and determines whether the hot water supply amount on the HP water heater 4 side is below a predetermined value, for example, below the flow rate threshold value. If the hot water supply amount on the HP water heater 4 side is below the flow rate threshold value (YES in S105), it shifts to the HP water heater single hot water supply mode (S106), and if the hot water supply amount exceeds the flow rate threshold value (NO in S105), it shifts to the first hybrid hot water supply mode as heat storage high temperature control (S107).

[0053] HP water heater independent hot water supply mode (S106): This HP water heater independent hot water supply mode is an example of the selection process of the independent hot water supply mode of the present disclosure. That is, in this mode, since there is heat storage required for hot water supply from the tank unit 12, hot water is supplied using only the HP water heater 4. At this time, the multi water heater 6 is in a standby state.

[0054] First hybrid hot water supply mode (S107): This first hybrid hot water supply mode combines the hot water supply of the HP water heater 4 and the hot water supply of the multi water heater 6. That is, although there is heat storage in the tank unit 12, since the hot water supply volume exceeds the flow rate threshold value, it is determined that the hot water supply demand cannot be met only by the hot water supply of the HP water heater 4 or the independent hot water supply for a long period cannot be continued, and the multi water heater 6 is operated to share the hot water supply between the hot water supply of the HP water heater 4 and the hot water supply of the multi water heater 6 to meet the hot water supply demand. In this first hybrid hot water supply mode (S107), efficient utilization of the heat storage in the tank unit 12 and heat storage high temperature control for reducing the combustion efficiency of the multi water heater 6 are executed.

[0055] Second hybrid hot water supply mode (S108): This second hybrid hot water supply mode combines the hot water supply of the HP water heater 4 and the hot water supply of the multi water heater 6 to supply hot water. That is, although there is heat storage in the tank unit 12, since the heat storage temperature in the tank unit 12 cannot meet the hot water supply demand, the hot water supply demand cannot be met only by the hot water supply of the HP water heater 4, and the multi water heater 6 is operated. The HP water heater 4 supplies hot water so as to use as much heat storage in the tank unit 12 as possible, and the unmet part is shared by the hot water supply of the multi water heater 6 to meet the hot water supply demand. In this second hybrid hot water supply mode (S108), efficient utilization of the heat storage in the tank unit 12 and heat storage low temperature control for reducing the combustion efficiency of the multi water heater 6 are executed.

[0056] Multi-boiler single hot water supply mode (S109): This multi-boiler single hot water supply mode is an example of the selection process of the single hot water supply mode of the present disclosure. That is, in this mode, if there is no heat storage required for hot water supply from the tank unit 12, hot water is supplied using only the multi-boiler 6. At this time, the HP water heater 4 stops supplying hot water, and the heat storage operation of the tank unit 12 is performed.

[0057] <Regarding the hot water supply control table 60> FIG. 5 shows an example of the hot water supply control table 60. This hot water supply control table 60 is formed, for example, in the memory unit 32, and is an example of a processing area for calculating the hot water supply capacity of each of the HP water heater 4 and the multi-boiler 6 and the mixed hot water supply capacity when they are combined. The hot water supply control table 60 includes, for example, an HP water heater information section 61, a multi-boiler information section 62, and a hot water supply capacity section 63 after mixing in the vertical direction, and a flow rate information section 64 and a hot water supply temperature information section 65 in the horizontal direction. In hot water supply control, for example, the amount of heat is calculated using the flow rate information and the hot water supply temperature information input to the hot water supply control table 60, and based on this amount of heat, the hot water supply capacity is adjusted by the HP water heater 4 and the multi-boiler 6, and a hot water supply instruction is generated. Specifically, the HP control unit 14 calculates the total hot water supply amount A + B by combining the hot water supply amount A on the HP water heater 4 side and the hot water supply amount B on the multi-boiler 6 side, and the hot water supply temperature X from the HP water heater 4 and the hot water supply temperature Y from the multi-boiler 6 are input. Then, in hot water supply control, the hot water supply temperature after mixing is calculated based on the hot water supply amount and the hot water supply temperature input to the hot water supply control table 60. The calculation of this hot water supply temperature is performed, for example, by the following formula. (Hot water supply temperature)=[(A×X)+(B×Y)] / (A+B) ···(1) In hot water supply control, for example, this hot water supply temperature is set as the set temperature input to the remote control 8 as the hot water supply required set temperature, and by inverse calculation of formula (1), either or both of the hot water supply amount or the hot water supply temperature from the HP water heater 4 and the multi-boiler 6 are calculated, and the hot water supply process may be executed. In hot water supply control, for example, as hot water supply conditions, the hot water supply amount A of the HP water heater 4, the hot water supply amount B of the multi water heater 6, and the hot water supply temperature Y of the multi water heater 6 are set, and after setting the hot water supply temperature X of the HP water heater 4 within a predetermined range, the hot water supply temperature after mixing is calculated based on the heat quantity, and it is determined whether or not this calculated hot water supply temperature matches the hot water supply temperature required for hot water supply. Then, when the calculated hot water supply temperature is not within a predetermined range with respect to the hot water supply requirement, the HP control unit 14 may vary the hot water supply temperature X of the HP water heater 4.

[0058] <Regarding the hybrid hot water supply mode> FIGS. 6 and 7 show state examples of the second hybrid hot water supply mode. The state changes and processing execution timings shown in FIGS. 6 and 7 are examples, and the present invention is not limited to such a configuration. Also, in FIGS. 6 and 7, for example, the horizontal axis indicates the passage of time, and the vertical axis indicates the flow rate and the hot water supply temperature, respectively.

[0059] When the heat storage temperature in the tank unit 12 has decreased with respect to the hot water supply requirement, or when the heat storage temperature has dropped below the set temperature of the hot water supply requirement during hot water supply, the hot water supply system 2 uses the multi water heater 6 in combination to supply the insufficient amount of heat. In the hot water supply process shown in FIG. 6, when the total hot water supply amount required for hot water supply is small, for example, about 8 [L / min], or as a processing example when increasing the hot water supply amount from the HP water heater 4, a case where only one of the gas water heaters 24-1 or 24-2 on the multi water heater 6 side is operated is shown.

[0060] In the hot water supply system 2, for example, as shown in FIG. 6, it is in a standby state until a hot water supply requirement occurs at time t1 or earlier, and when the hot water supply requirement is issued, the hot water supply process by the HP water heater 4 starts at time t1. Then, when the heat storage temperature in the tank unit (TU) 12 drops below the set temperature of the hot water supply requirement during hot water supply, for example, the hot water supply system 2 shifts to the second hybrid hot water supply mode and outputs a hot water supply instruction to the multi water heater 6.

[0061] At this time, the HP control unit 14 generates, for example, a hot water supply control table 60, sets, as a hot water supply condition, a set value obtained by reducing the hot water supply amount on the HP hot water supply machine 4 side to a predetermined range, sets the total hot water supply amount based on the set temperature of the hot water supply request and the water supply amount detected by the flow rate sensor 23, and calculates each set value so as to make the most use of the heat storage of the tank unit 12 for the hot water supply temperature, flow rate, hot water supply temperature from the HP hot water supply machine 4, etc. on the multi-hot water supply machine 6 side, and also performs operations such as setting the number of operating units of the gas hot water supply machines 24-1 and 24-2 and the equipment to be operated. In the hot water supply system 2, for example, when starting the hot water supply process in the second hybrid hot water supply mode, since the hot water supply amount of the gas hot water supply machine 24-1 or the gas hot water supply machine 24-2 reaches the set value at time t3, the actual hot water supply temperature, which is the mixing temperature with the hot water discharged from the HP hot water supply machine 4, can be adjusted to be the same as or within a predetermined range of the set temperature of the hot water supply request.

[0062] In the hot water supply process, for example, when a hot water supply request occurs at time t1, regardless of whether the heat storage temperature in the tank unit 12 is higher than the set temperature of the hot water supply request, the hot water supply may be started by the HP hot water supply machine 4 alone or in combination with the HP hot water supply machine 4 and the gas hot water supply machine 24-1.

[0063] In the hot water supply process shown in FIG. 7, as an example of a case where the total hot water supply amount of the hot water supply request is large, for example, when it is 18 [L / min], or as an example of a process when reducing the hot water supply amount from the HP hot water supply machine 4, a case where both the gas hot water supply machine 24-1 and the gas hot water supply machine 24-2 on the multi-hot water supply machine 6 side are operated is shown.

[0064] In the hot water supply system 2, for example, as shown in FIG. 7, when a hot water supply request is issued, hot water supply processing by the HP hot water heater 4 and hot water supply processing combining the gas hot water heater 24-1 are started at time t1. At this time, in hot water supply control, for example, the hot water output amount and the hot water output temperature are made equal between the tank unit 12 and the gas hot water heater 24-1, and the total hot water output amount and the hot water output temperature corresponding to the hot water supply request are realized. And when the heat storage temperature in the tank unit (TU) 12 drops below the set temperature of the hot water supply request during hot water supply, for example, the hot water supply system 2 shifts to the second hybrid hot water output mode and outputs an operation start instruction to the gas hot water heater 24-2 of the multi hot water heater 6 that is in a stopped state.

[0065] At this time, the HP control unit 14, for example, reduces the hot water output amount on the HP hot water heater 4 side to a predetermined range with respect to the hot water supply control table 60, and recalculates the hot water output temperature, flow rate, etc. on the multi hot water heater 6 side based on the set temperature and the total hot water output amount of the hot water supply request, increases the hot water output temperature for the gas hot water heaters 24-1 and 24-2, and adjusts the hot water output amount. And in the hot water supply system 2, for example, when starting the hot water output processing in the second hybrid hot water output mode, the actual hot water output temperature, which is the mixing temperature with the hot water discharged from the HP hot water heater 4, can be adjusted to be the same as or within a predetermined range of the set temperature of the hot water supply request when the hot water output amount of the additionally added gas hot water heater 24-2 becomes the set value at time t3. In the hot water supply system 2, for example, continuously monitor the heat storage state in the tank unit 12, and based on the heat amount of the hot water supply request and the heat amount of the hot water discharged from the hot water supply system 2, recalculate the hot water output amount and the hot water output temperature of the HP hot water heater 4 and the hot water output amount and the hot water output temperature of the multi hot water heater 6 according to the change of the state.

[0066] Note that the hot water supply control shown in FIG. 7 shows the case where the heat storage temperature of the tank unit 12 drops, the hot water output amount from the HP hot water heater 4 is suppressed, and the actual hot water output amount decreases after time t2 when the operation of the gas hot water heater 24-2 is started, but it is not limited to such processing. In hot water supply control, for example, around time t2, the hot water output amounts of the gas hot water heaters 24-1 and 24-2 may be set to compensate for the decrease in the hot water output amount from the HP hot water heater 4 to maintain the actual hot water output amount.

[0067] <Hot water supply control> FIG. 8 shows an example of hot water supply control in the hybrid hot water supply mode. The processing content and processing procedure shown in FIG. 8 are examples, and the technology of the present disclosure is not limited to such a configuration. Further, the processing content shown here is an example of the hot water supply method and hot water supply program of the present disclosure.

[0068] In this hot water supply control, for example, in the hot water supply control of FIG. 4, an example of the processing when shifting to the first hybrid hot water supply mode (S107) or the second hybrid hot water supply mode (S108) is shown, and the hot water supply process is performed according to the heat storage state in the tank unit 12 and the set temperature of the hot water supply request. In this hot water supply process, for example, as shown in FIG. 8, it includes a flow rate determination (S201), a heat storage determination step (S202), a setting of the first hybrid hot water supply mode (S203), a hot water supply control (S204), a time elapse determination (S205), a setting of the second hybrid hot water supply mode (S206), and the like.

[0069] Flow rate determination (S201): The HP control unit 14 is in a standby state until it acquires the flow rate detection from the flow rate sensor 23, for example (NO in S201). When the water supply W is detected by the flow rate sensor 23 due to the opening of the hot water supply faucet or the like (YES in S201), the hot water supply process is started. Heat storage determination step (S202): The HP control unit 14 acquires temperature information representing the heat storage temperature based on the detected temperature of the temperature sensor 22 and determines the heat storage of the tank unit 12. In this heat storage determination, it is determined whether the upper layer temperature is less than or equal to the remote control set temperature. If it is higher than the remote control set temperature (NO in S202), the heat storage high temperature control is set to ON as the first hybrid hot water supply mode (S203), and the process proceeds to the hot water supply control (S204). Setting of the first hybrid hot water supply mode (S203): The HP control unit 14 sets, for example, in the hot water supply control table 60, the hot water supply temperature and the hot water supply amount from the HP hot water supply machine 4 side to values close to the hot water supply request, and generates a hot water supply instruction for the multi-hot water supply machine 6 side so as to supplement the insufficient hot water supply temperature and hot water supply amount with respect to the hot water supply request. Hot water discharge control (S204): The HP control unit 14 outputs the hot water discharge temperature and the hot water discharge amount set in the hot water supply control table 60 to the HP hot water supply device 4 and the multi-hot water supply device 6 side, and causes the hot water supply by the heat storage high temperature control to be executed.

[0070] Elapsed time determination (S205): When the temperature on the upper layer side in the tank unit 12 is equal to or lower than the remote control set temperature (YES in S202), the HP control unit 14 waits until, for example, 3 [sec] elapses as the standby time tm. This standby time tm suppresses, for example, the influence of temperature fluctuations caused by the inflow of the water supply W into the tank unit 12 due to the start of hot water supply. When the standby time tm has elapsed, the process proceeds to the temperature determination (S206) of the upper layer temperature in the tank unit 12. Second hybrid hot water discharge mode setting (S206): The HP control unit 14 sets, for example, the hot water discharge amount of the HP hot water supply device 4 to the minimum regulated flow rate as part of the hot water discharge conditions in the hot water supply control table 60, and sets the hot water discharge temperature within a predetermined range and to a value lower than the remote control set temperature to discharge hot water. Further, the HP control unit 14 issues an instruction to execute the hot water supply process in the second hybrid hot water discharge mode to the hot water supply control units 26-1 and 26-2, and generates and outputs hot water discharge instructions such as the hot water discharge temperature set for the HP hot water supply device 4, the required flow rate calculated from the total hot water discharge amount, the remote control set temperature, and the hot water discharge temperature set for the multi-hot water supply device 6.

[0071] <Hot water supply process in the second hybrid hot water discharge mode> FIG. 9 shows an example of hot water supply control in the second hybrid hot water discharge mode. The processing contents and processing procedures shown in FIG. 9 are examples, and the technology of the present disclosure is not limited to such a configuration. Further, the processing contents shown here are an example of the hot water supply method and the hot water supply program of the present disclosure.

[0072] This hot water supply control includes, for example, a temperature determination step (S301), a hot water discharge condition setting step (S302), an HP hot water discharge temperature calculation step (S303), a hot water discharge step (S304), a second hybrid hot water discharge mode release step (S305), and the like.

[0073] Temperature determination step (S301): The HP control unit 14 acquires the detected temperature of the temperature sensor 22, and determines whether the temperature of the upper layer of the tank unit 12 is higher than a threshold temperature Ts, for example, 45 [°C]. This threshold temperature = 45 [°C] is a temperature at which it is estimated that hot water can be discharged within a temperature range including, for example, the set threshold temperature Ts or the threshold temperature in the hybrid hot water supply mode, and is an example of the heat storage regulation temperature condition of the present disclosure. Note that in the hot water supply process, the threshold temperature is not limited to 45 [°C]. If the upper layer temperature > 45 [°C] (YES in S301), the HP control unit 14 determines that it is the heat storage temperature required to execute the second hybrid hot water supply mode for the tank unit 12, and proceeds to the hot water discharge condition setting step (S302).

[0074] Hot water discharge condition setting step (S302): The HP control unit 14 sets the hot water discharge conditions for the HP water heater 4 and the multi water heater 6 in the second hybrid hot water supply mode. For these hot water discharge conditions, for example, the hot water discharge amount from the HP water heater 4 side is set to the minimum regulated flow rate, and for the multi water heater 6 side, hot water discharge conditions for compensating the hot water discharge temperature and the hot water discharge amount of the shortage for the hot water supply request are set. For the hot water discharge conditions on the multi water heater 6 side, for example, the hot water discharge flow rate calculated from the total hot water discharge amount and the regulated flow rate of the HP water heater 4, and a temperature that is, for example, 5 [°C] higher than the set temperature of the remote controller 8 is set as the hot water discharge temperature. This hot water discharge temperature may increase or decrease according to, for example, the difference between the detected temperature on the HP water heater 4 side and the set temperature of the remote controller 8, or the hot water discharge amount from the HP water heater 4. These hot water discharge condition setting processes are performed using the hot water supply control table 60, and the set hot water discharge conditions serve as the hot water supply instruction for the multi water heater 6 side.

[0075] HP hot water discharge temperature calculation step (S303): The HP control unit 14 compares, for example, as described above using FIG. 5, whether the calculated values of the hot water discharge amount of the HP water heater 4, the mixed hot water discharge amount, and the hot water discharge temperature calculated using the hot water discharge instruction for the multi water heater 6 match the hot water discharge temperature of the hot water supply request or are within a predetermined range, and sets the hot water discharge temperature of the HP water heater 4 by calculation based on this comparison result.

[0076] Hot water supply process (S304): As the hot water supply process in the second hybrid hot water supply mode, the hot water supply system 2 uses the HP water heater 4 and the multi-functional water heater 6 in combination to supply hot water according to the set HP hot water temperature and the hot water supply instruction, and executes hot water supply by heat storage low temperature control. The HP control unit 14 executes S301 at a predetermined timing after the start of hot water supply and during the second hybrid hot water supply, and repeatedly determines whether to continue hot water supply by monitoring the heat storage temperature in the tank unit 12.

[0077] Release process of the second hybrid hot water supply mode (S305): When the heat storage in the tank unit 12 becomes insufficient and the upper layer temperature becomes lower than the set threshold temperature Ts (NO in S301), the HP control unit 14 determines that hot water supply using the HP water heater 4 is impossible and releases the currently executed second hybrid hot water supply control. By releasing this second hybrid hot water supply mode, the process returns to S201 in FIG. 8 or S101 in FIG. 4.

[0078] <Effects of the First Embodiment> According to such a configuration, any of the following effects can be obtained. (1) By determining the heat storage state from the temperature on the upper layer side in the tank unit 12 and setting a multi-stage hybrid hot water supply mode according to the temperature and flow rate conditions of the hot water supply request, the heat storage in the HP water heater 4 can be utilized as effectively as possible. (2) By effectively utilizing the heat storage in the HP water heater 4, the energy efficiency of the hot water supply system 2 can be improved. (3) By monitoring the decrease in the heat storage temperature in the tank unit 12 and immediately operating the multi-functional water heater 6 to compensate for the insufficient heat quantity when the heat storage temperature decreases, hot water supply at the hot water supply temperature and flow rate corresponding to the hot water supply request can be realized.

[0079] 〔Second Embodiment〕 FIG. 10 shows a hot water supply system according to the second embodiment. The configuration shown in FIG. 10 is an example, and the technology of the present disclosure is not limited to such a configuration. Also, in FIG. 10, the same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

[0080] This hot water supply system 70 includes a solar tank unit 72 as the first hot water supply means. This solar tank unit 72 is a means for heating hot water or water in the tank unit 12 using the heat collected by a solar heat collector 74 (hereinafter referred to as the "collector 74") as the first heat source to supply hot water. This collector 74 is an example of a heat exchange means that collects solar heat applied from the outside and exchanges heat with a heat medium HM that circulates the heat (heat quantity) inside. Between the tank unit 12 and the collector 74, there is provided a solar heat collection circuit 76 (hereinafter referred to as the "collection circuit 76") with a sealed interior. Through the heat medium HM circulated inside, the heat recovered by the collector 74 is exchanged with the hot water or water in the tank unit 12. As the heat medium HM, for example, in addition to water, an antifreeze liquid that is less affected by changes in the outside air temperature and other liquids are used. The collection circuit 76 is provided with a circulation pump 78 for circulating the heat medium HM in the sealed interior. In addition, a heat exchange portion 80 for exchanging the heat medium HM with the hot water or water in the tank unit 12 is formed in a part inserted inside the tank unit 12 or a part adjacent to the tank unit 12. The circulation pump 78 is an example of a pressure feeding means for flowing the heat medium HM between the collector 74 and the heat exchange portion 80. This circulation pump 78 is, for example, a pump using a DC (direct current) motor and may be provided with a backflow prevention function for preventing the heat medium HM from flowing back when the pump is stopped.

[0081] The solar tank unit 72 is provided with a control unit 82, which not only monitors the heat storage state in the tank unit 12, but also obtains the detected temperature information of the temperature sensors 84 and 86 installed in the heat collection circuit 76, thereby monitoring the temperature T1 of the heat medium HM before heat exchange in the heat exchange unit 80 and the temperature T2 of the heat medium HM returning to the heat collector 74 after heat exchange, and controls the heat storage operation for the tank unit 12. Further, this control unit 82 is an example of the control unit of the hot water supply system 70 of the present disclosure, and like the aforementioned HP control unit 14, it constitutes a control means for the master unit with respect to the multi-hot water heater 6, and also performs hot water supply control of the solar tank unit 72 and hot water supply cooperation control of the solar tank unit 72 and the multi-hot water heater 6 in the hybrid hot water supply mode. This control unit 82 is composed of, for example, a computer equipped with a processor, a memory, a communication unit (not shown), etc. In addition to executing an OS for operating the solar tank unit 72 and the hot water supply control program of the present disclosure, it executes heat storage control for storing the heat collected by the heat collector 74 in the tank unit 12. The control unit 82 is connected to the remote controller 8 by wire or wirelessly, and like the aforementioned HP control unit 14, it acquires heat storage information such as the detected temperature of the temperature sensor 22, calculates the hot water supply temperature, performs hot water supply control described later, and executes cooperation control with the multi-hot water heater 6.

[0082] The control unit 82, for example, takes in the temperatures T1 and T2 from the temperature sensors 84 and 86, and as heat collection control, performs control such as driving the circulation pump 78. For the control of the circulation pump 78, for example, as drive control information (not shown), a rotation speed table of the circulation pump 78 with rotation speeds set in multiple stages may be used based on the states of the temperatures T1 and T2 of the heat medium HM and the temperature in the tank unit 12. Then, the control unit 82, for example, monitors the amount of heat applied to the heat collector 74, that is, the amount of heat exchanged with the heat medium HM, and the temperature in the tank unit 12, and controls the rotation of the circulation pump 78, and may control the flow rate of the heat medium HM.

[0083] <Heat collection control> In the solar tank unit 72, as steps of the heat collection process for storing heat in the tank unit 12, for example, steps such as a heat collection start operation, a heat storage operation, a heat collection execution determination operation, and a heat collection stop operation are performed. As a heat collection start operation, the control unit 82 determines, for example, whether it is a set time zone, that is, a time zone when the sun is out, or whether the temperature of the heat medium HM after heat exchange in the heat collector 74, which is the detected temperature of the temperature sensor 84, is higher than the detected temperature of the temperature sensor 22 in the tank unit 12, to confirm that heat collection is possible. Next, as a heat storage operation, the control unit 82 starts the circulation pump 78 and circulates the heat medium HM in a state where the temperature in the tank unit 12 does not become higher than the temperature of the heat medium HM, and stores the recovered solar heat in the tank unit 12. As a heat collection execution determination operation, the control unit 82 monitors the heat collection state of the solar heat by the heat collector 74 and compares the temperature of the hot water in the tank unit 12 with the temperature of the heat medium HM to determine whether heat collection is being performed. As a heat collection stop operation, when the heat collector 74 is not in a state where it can collect solar heat, or according to the temperature comparison result between the hot water in the tank unit 12 and the heat medium HM, etc., the control unit 82 stops the circulation pump 78 and stops the heat collection process.

[0084] In this heat collection control, the control unit 82 sets a predetermined threshold temperature for, for example, the temperature of the heat medium HM, the detected temperature of the hot water in the tank unit 12, and the difference between these detected temperatures, and adjusts the operating rotation speed of the circulation pump 78 according to whether the threshold temperature has been reached. In addition, control such as intermittent operation in which the operation and stop of the circulation pump 78 are repeated may be performed.

[0085] <Hot water supply control> The control unit 82 performs hot water supply control for the hot water supply system 70, and depending on the heat storage state in the tank unit 12, it performs hot water supply using only the solar tank unit 72 in the single hot water supply mode, the first hybrid hot water supply mode in which the solar tank unit 72 and the multi hot water heater 6 are used in combination when there is sufficient heat storage in the tank unit 12, or the second hybrid hot water supply mode in which the solar tank unit 72 and the multi hot water heater 6 are used in combination when there is little heat storage in the tank unit 12, and other hot water supply processes. For the determination and control processing of these hot water supply modes, the same processing as the above-described steps S101 to S109 (FIG. 4), steps S201 to S206 (FIG. 8), and steps S301 to S305 (FIG. 9) may be performed.

[0086] <Effect of the Second Embodiment> According to such a configuration, any of the following effects can be obtained. (1) The same effect as that of the first embodiment can be obtained. (2) By using solar heat as the heat source of the first hot water supply means, it is possible to reduce the environmental load and effectively utilize natural energy. (3) Based on the heat storage state in the tank unit 12 and the solar heat collection state, the operation of the circulation pump 78 is controlled, and energy saving can be achieved by preventing the pump from operating unnecessarily.

Example

[0087] Next, an example of the implementation of heat storage low temperature control, which is the second hybrid hot water supply mode, is shown. FIG. 11 is a flowchart showing an example of hot water supply control in the hybrid hot water supply mode. The processing content and processing procedure shown in FIG. 11 are examples.

[0088] The HP control unit 14 monitors the operation of the remote control 8 from, for example, the standby state (S401), and if the remote control 8 operates (YES in S401), it monitors whether a flow rate has occurred in the hot water supply system 2 (S402). In the hot water supply system 2, for example, before the flow rate occurs (NO in S402), as the hot water supply required temperature, the set temperature Tx on the side of the HP water heater 4 and the multi water heater 6 is set to, for example, 60 [°C], and the hot water output amounts of both the HP water heater 4 and the multi water heater 6 are both 0 [L / min]. Then, in the hot water supply system 2, when the flow rate occurs (YES in S402), the hot water output amount of the HP water heater 4 changes from 0 [L / min] to the hot water output amount Q1 [L / min], and the hot water output amount of the multi water heater 6 changes from 0 [L / min] to the hot water output amount Q2 [L / min]. These hot water output amounts Q1 and Q2 may be, for example, values obtained by equally dividing the total hot water output amount required for hot water supply.

[0089] When the flow rate occurs, the HP control unit 14 determines whether the temperature on the upper layer side of the tank unit 12 detected by the temperature sensor 22 is equal to or lower than the remote control set temperature (S403). If the determination result is equal to or lower than the remote control set temperature (YES in S403), in order to shift to the determination of whether the heat storage in the tank unit 12 can be used for hot water supply, the hot water output amount on the side of the HP water heater 4 is set to 0 [L / min], and the hot water output amount on the side of the multi water heater 6 is set to Q3 [L / min]. This hot water output amount Q3 is equal to the total hot water output amount required for hot water supply.

[0090] For example, when the HP control unit 14 waits until, for example, 3 [sec] elapses with the hot water output state on the side of the multi water heater 6 alone as the predetermined time tn, it determines whether the temperature on the upper layer side of the tank unit 12 is higher than the threshold temperature Ts, for example, 45 [°C] (S405). If the temperature on the upper layer side of the tank unit 12 is higher than the threshold temperature Ts (YES in S405), the HP control unit 14 sets the hybrid hot water output mode using the multi water heater 6 together as the heat storage low temperature control to ON (S406), performs the calculation process of the hot water output temperature of the HP water heater 4 (S407), and causes hot water to be output (S408). In this hot water temperature calculation process, for example, as the regulated hot water supply amount QL on the HP water heater 4 side, for example, the minimum set amount of 3 [L / min] is used, and the hot water temperature Tm is set lower than the set temperature Tx of the hot water supply request, for example, to 40 [°C]. Also, on the multi-water heater 6 side, for example, based on the regulated hot water supply amount QL on the HP water heater 4 side, as the flow rate Qx [L / min], for example, 12 [L / min] is set, and in order to mix the hot water from the HP water heater 4 and supply hot water at the set temperature of the hot water supply request, the hot water temperature TH is set, for example, to 65 [°C].

[0091] In addition, in the heat storage low temperature control, for example, the set temperature is calculated so that the mixing temperature of the HP water heater 4 and the multi-water heater 6 is within a range of about 2 [°C] with respect to the remote control set temperature, or conditions such as setting the hot water temperature TH on the multi-water heater 6 side to be a predetermined temperature, for example, 5 [°C] higher than the remote control set temperature, may be set.

[0092] Also, if the temperature > Ts on the upper layer side of the tank unit 12 is not satisfied (NO in S405), the HP control unit 14 determines that it is not the heat storage temperature at which the hybrid hot water supply process can be performed, and sets the heat storage low temperature control to OFF (S409). In this case, the HP control unit 14 may set, for example, the single operation mode by the multi-water heater 6.

[0093] When executing the hot water supply process in the hybrid hot water supply mode, for the HP control unit 14, for example, as shown in FIG. 12, a hot water supply control table 60 is generated. When the hot water supply amounts for the HP water heater 4 and the multi-water heater 6 are set, a calculation process for the hot water temperature corresponding to the hot water supply request is performed. In the calculation process of the hot water temperature in the heat storage low temperature control, the set value of the multi-water heater 6 is calculated based on the hot water supply amount QL and the hot water temperature Tm on the HP water heater 4 side with respect to the set temperature and the total hot water supply amount of the hot water supply request. The hot water temperature Tm of the HP water heater 4 is affected by the heat storage state in the tank unit 12. The flow rate Qx of the multi-water heater 6 is set, for example, to a value obtained by subtracting the hot water supply amount QL of the HP water heater 4 from the total hot water supply amount Q3 after mixing. The hot water outlet temperature TH of the multi-boiler 6 is set to a value obtained by adding a predetermined temperature, for example, 5 [°C], to the set temperature Tx of the hot water supply request.

[0094] In the calculation process of the hot water outlet temperature of the HP water heater 4, the temperature that can supply hot water is determined from the heat storage state in the tank unit 12, and as a predetermined threshold temperature, it is 45 [°C] or less, which is the threshold temperature Ts at which hot water can be supplied in the second hybrid hot water supply mode, and in the range of, for example, 25 [°C] or more as the lowest threshold temperature, one or more temperatures are set. Here, for example, 25 [°C], 40 [°C], and 45 [°C] are set as three types of set temperatures Tm1, Tm2, and Tm3. These set temperatures may have different setting conditions depending on, for example, the threshold temperature Ts of the second hybrid hot water supply mode for the HP water heater 4 or the set temperature of the remote control. Then, the HP control unit 14 uses, for example, Equation (1) for each of the set temperatures Tm1, Tm2, and Tm3, and uses the hot water outlet temperature and hot water outlet amount set in the multi-boiler 6 and the regulated flow rate conditions of the HP water heater 4 to calculate the hot water outlet temperature after mixing. Then, the HP control unit 14 selects one of the set temperatures Tm1, Tm2, and Tm3 that matches the calculated hot water outlet temperature or is within a predetermined range and the set temperature of the remote control, which is the hot water supply request.

[0095] In the calculation process of the hot water outlet temperature of the multi-boiler 6, for example, when the ratio of the hot water outlet amount of the HP water heater 4 to the total hot water outlet amount is large, or when the hot water outlet temperature after mixing differs from the set temperature of the hot water supply request by 3 [°C] or more, the hot water outlet temperature may be calculated from the heat storage temperature on the HP water heater 4 side and the heat quantity of the hot water supply request. The calculation process based on this heat quantity is obtained, for example, by integrating the flow rate and the hot water outlet temperature.

[0096] In this embodiment, the process in the hot water supply system 2 using the HP water heater 4 as the first hot water supply means is described, but the technology of the present disclosure is not limited to such content. In the hot water supply system 70 using the solar tank unit 72, the control unit 82 may similarly execute the setting process of the hot water outlet temperature, hot water outlet amount on the solar tank unit 72 side, and hot water outlet temperature on the multi-boiler 6 side when executing the second hybrid hot water supply mode. 〔Modification Example〕

[0097] Regarding the embodiments and examples described above, the characteristic matters and modification examples thereof are listed below.

[0098] (1) In the above-described embodiments and examples, an example of hot water supply control was shown in the case where the heat storage temperature in the tank unit 12 decreased during the execution of the hot water supply process using at least the HP water heater 4 or the solar tank unit 72, and the hot water supply could not be performed alone in response to the hot water supply request. However, the technology of the present disclosure is not limited to such content. In the hot water supply systems 2 and 70, for example, when the hot water supply process is being performed in the single hot water outlet mode of the multi hot water heater 6, and the heat storage temperature in the tank unit 12 increases due to the operation of the HP unit 10 or the heat collection operation of the heat collector 74, that is, when at least the temperature of the hot water on the upper layer side of the tank unit 12 becomes equal to or higher than the limit temperature, a hybrid hot water outlet mode in which hot water is discharged from the HP water heater 4 and the solar tank unit 72 may be executed.

[0099] Note that this limit temperature may be set to a temperature higher than the threshold temperature Ts, which is the minimum heat storage temperature, for example, to prevent the heat storage in the tank unit 12 from becoming insufficient in a short time, or a temperature higher than the set temperature of the hot water supply request may be set. Thereby, the hot water supply systems 2 and 70 can prevent the so-called chattering state in which the hot water supply in the hybrid hot water outlet mode using the tank unit 12 and the hot water supply in the multi hot water heater hot water outlet mode due to insufficient heat storage are repeated.

[0100] (2) In the above-described embodiments and examples, the hot water supply systems 2 and 70 are shown as including the HP water heater 4 having one tank unit 12 or the solar tank unit 72, and the multi water heater 6 having two gas water heaters 24-1 and 24-2, but the present disclosure is not limited thereto. In the hot water supply system 2 of the present disclosure, for example, one HP water heater 4 or solar tank unit 72 may include two or more tank units 12, or a plurality of HP water heaters 4 or solar tank units 72 each having one or a plurality of tank units 12 may be coordinated. Further, in the hot water supply system 2, the multi water heater 6 may include three or more gas water heaters 24-1, 24-2, 24-3 ···, or a plurality of multi water heaters 6 each having two gas water heaters 24-1 and 24-2 may be coordinated. Furthermore, as the first hot water supply means, the HP water heater 4 and the solar tank unit 72 may be used in combination.

[0101] (3) In the above-described second embodiment, the heat collector 74 and the tank unit 12 are shown as being connected by the heat collection circuit 76, and the heat medium HM flows into the heat exchange section 80 by the operation of the circulation pump 78, but the present disclosure is not limited to such a configuration. The heat collection circuit 76 may be provided with, for example, a bypass path that bypasses the heat exchange section 80 and allows the heat medium HM to flow from the forward pipe to the return pipe. The bypass path may be provided with, for example, a bypass valve for restricting or blocking the inflow of the heat medium HM to the heat exchange section 80. Thereby, the hot water supply system 70 can prevent the low-temperature heat medium HM from flowing into the tank unit 12, for example, when solar heat cannot be collected, and can also be used for processes such as restricting the heat exchange between the hot water in the tank unit 12 and the heat medium HM at the timing of shifting to the second hybrid hot water supply mode in the hot water supply process. That is, this bypass path and bypass valve can be used to control the temperature state of the hot water stored in the tank unit 12, for example, by adjusting the opportunity for heat exchange between the heat medium HM and the hot water.

[0102] (4) In the second embodiment described above, in addition to the hot water temperature in the tank unit 12, the control unit 82 may combine information such as season, weather, and sunshine duration to perform heat collection processing, and may also use them as determination information on whether to shift to the hybrid hot water supply mode.

[0103] As described above, the preferred embodiments and examples of the technology of the present disclosure have been described. The technology of the present disclosure is not limited to the above description. Based on the gist of the invention described in the claims or disclosed in the form for carrying out the invention, various modifications and changes are possible for those skilled in the art. Needless to say, such modifications and changes are included in the technical scope of the present disclosure.

Industrial Applicability

[0104] The hot water supply method, system, and program of the present disclosure are useful in that, in a hot water supply system provided with first hot water supply means including a tank unit for storing heated hot water and second hot water supply means including one or more gas water heaters, a hot water supply mode for changing the hot water supply conditions on the first hot water supply means side according to the heat storage state in the tank unit is set, and by jointly supplying hot water with the second hot water supply means, the utilization efficiency of the heat storage in the tank unit can be increased.

Explanation of Signs

[0105] 2, 70 Hot water supply system 4 HP Water heater 6 Multi water heater 8 Remote control device 10 HP Unit 12 Hot water storage tank unit 14 HP Control unit 16 Circulation path 18 Water supply circuit 20 Hot water supply circuit 22, 27, 46-1, 46-2, 48-1, 48-2, 50-1, 50-2, 84, 86 Temperature sensor 23, 25, 52-1, 52-2 Flow sensor 24-1, 24-2 Gas water heater Hot water supply control units 26-1 and 26-2 Processors 30, 38-1, and 38-2 Memory units 32, 40-1, and 40-2 Communication units 34, 42-1, and 42-2 Input / output units 36, 44-1, and 44-2 Heat source machines 51-1 and 51-2 Hot water supply control table 60 HP hot water supply machine information unit 61 Multi-hot water supply machine information unit 62 Hot water output capacity unit after mixing 63 Flow rate information unit 64 Hot water output temperature information unit 65 Solar tank unit 72 Solar heat collector 74 Solar heat collection circuit 76 Circulation pump 78 Heat exchange unit 80 Control unit 82

Claims

1. A hot water supply method for a hot water supply system including a first hot water supply means for supplying hot water using hot water stored in a hot water storage tank heated by a first heat source, and a second hot water supply means for supplying hot water with hot water heated by a second heat source, comprising: a step of monitoring the heat storage temperature in the hot water storage tank by a control unit of the first hot water supply means based on a detected temperature of a temperature sensor installed at a predetermined height position in the hot water storage tank, at least while hot water is being discharged from the first hot water supply means; when the heat storage temperature becomes lower than the set temperature of the hot water supply demand, the control unit sets a hot water discharge condition for reducing the hot water discharge temperature and the hot water discharge amount on the first hot water supply means side, and increasing the hot water discharge temperature on the second hot water supply means side to a temperature higher than the set temperature of the hot water supply demand, and generates a hot water discharge instruction including the hot water discharge temperature and the hot water discharge amount on the first hot water supply means side and the hot water discharge temperature of the second hot water supply means that enable hot water supply according to the hot water supply demand according to the hot water discharge condition; a step of the control unit transmitting the hot water discharge instruction to the first hot water supply means and the second hot water supply means; A hot water supply method including the above.

2. a step of the control unit calculating a mixing temperature using the hot water discharge temperature on the first hot water supply means side set according to the hot water discharge amount on the first hot water supply means side and the heat storage temperature included in the hot water discharge condition, and the hot water discharge temperature on the second hot water supply means side, and generating the hot water discharge instruction such that the mixing temperature is the same value as the set temperature of the hot water supply demand or within a certain range including the same value; The hot water supply method according to claim 1, including the above.

3. a step of the control unit setting the hot water discharge temperature on the first hot water supply means side within a range of the set temperature of the hot water supply demand and a heat storage regulation temperature condition; when the calculated mixing temperature and the set temperature of the hot water supply demand are not the same value or within a certain range as a result of comparison, a step of adjusting either or both of the hot water discharge temperature and the hot water discharge amount on the first hot water supply means side; The hot water supply method according to claim 2, including the above.

4. a step of the control unit calculating the hot water discharge temperature on the first hot water supply means side using the hot water discharge amount and the hot water discharge temperature on the second hot water supply means side, the set temperature of the hot water supply demand, and the total hot water discharge amount, based on the hot water discharge amount on the first hot water supply means side reduced to a predetermined range; The hot water supply method according to claim 1, including the above.

5. A hot water supply system including a first hot water supply means for supplying hot water using hot water stored in a hot water storage tank heated by a first heat source, and a second hot water supply means for supplying hot water with hot water heated by a second heat source, Temperature detection means for detecting the temperature at a predetermined height position within the hot water storage tank; Flow rate monitoring means for monitoring the total hot water supply amount of the hot water supply request; At least during hot water supply from the first hot water supply means, the heat storage temperature within the hot water storage tank is monitored based on the detected temperature of the temperature detection means. When the heat storage temperature becomes lower than the set temperature of the hot water supply request, the hot water supply temperature and the hot water supply amount on the first hot water supply means side are reduced, and the hot water supply temperature on the second hot water supply means side is set to a temperature higher than the set temperature of the hot water supply request. Control means for generating a hot water supply instruction including the hot water supply temperature and the hot water supply amount on the first hot water supply means side and the hot water supply temperature of the second hot water supply means that enables hot water supply according to the hot water supply request according to the hot water supply condition; A hot water supply system comprising:

6. The control means calculates a mixing temperature using the hot water supply amount on the first hot water supply means side included in the hot water supply condition and the hot water supply temperature on the first hot water supply means side set based on the heat storage temperature, and the hot water supply amount on the second hot water supply means side and the hot water supply temperature on the second hot water supply means side included in the hot water supply condition, and generates the hot water supply instruction in which the mixing temperature is the same value as the set temperature of the hot water supply request or within a certain range including the same value. The hot water supply system according to claim 5.

7. The control means sets the hot water supply temperature on the first hot water supply means side within the range of the set temperature of the hot water supply request and the heat storage regulation temperature condition. As a result of comparing the calculated mixing temperature with the set temperature of the hot water supply request, if it is not within the same value or a certain range, either one or both of the hot water supply temperature and the hot water supply amount on the first hot water supply means side are adjusted. The hot water supply system according to claim 6.

8. The control means uses the hot water supply amount and the hot water supply temperature on the second hot water supply means side, the set temperature of the hot water supply request, and the total hot water supply amount, and calculates the hot water supply temperature on the first hot water supply means side based on the hot water supply amount on the first hot water supply means side reduced to a predetermined range. The hot water supply system according to claim 5.

9. The first heat source of the first hot water supply means uses air heat using a heat pump or solar heat using a solar collector, and the second heat source of the second hot water supply means uses heat generated by burning fuel gas. The hot water supply system according to claim 5.

10. A program for a computer of a hot water supply system including a first hot water supply means for supplying hot water using hot water stored in a hot water storage tank heated by a first heat source and a second hot water supply means for supplying hot water with hot water heated by a second heat source, A function of detecting the temperature at a predetermined height position in the hot water storage tank by temperature detecting means, A function of monitoring the total hot water supply amount of a hot water supply request by flow rate monitoring means, A function of monitoring the heat storage temperature in the hot water storage tank based on the detected temperature of the temperature detecting means at least while hot water is being supplied from the first hot water supply means, A function of setting a hot water supply condition for reducing the hot water supply temperature and the hot water supply amount on the first hot water supply means side and raising the hot water supply temperature on the second hot water supply means side to a temperature higher than the set temperature of the hot water supply request when the heat storage temperature becomes lower than the set temperature of the hot water supply request, A function of generating a hot water supply instruction including the hot water supply temperature and the hot water supply amount on the first hot water supply means side and the hot water supply temperature of the second hot water supply means that enable hot water supply according to the hot water supply request under the hot water supply condition, A program for causing the computer to execute the above.

11. A function of calculating a mixing temperature using the hot water supply amount on the first hot water supply means side included in the hot water supply condition and the hot water supply temperature on the first hot water supply means side set according to the heat storage temperature, and the hot water supply amount on the second hot water supply means side and the hot water supply temperature on the second hot water supply means side included in the hot water supply condition, and generating the hot water supply instruction such that the mixing temperature becomes the same value as the set temperature of the hot water supply request or a certain range including the same value, The program according to claim 10, for causing the computer to execute the above.

12. A function of setting the hot water supply temperature on the first hot water supply means side within the range of the set temperature of the hot water supply request and the heat storage regulation temperature condition, and when the calculated mixing temperature and the set temperature of the hot water supply request are not within the same value or a certain range as a result of comparison, adjusting either one or both of the hot water supply temperature and the hot water supply amount on the first hot water supply means side, The program according to claim 11, for causing the computer to execute the above.

13. A function of calculating the hot water supply temperature on the first hot water supply means side using the hot water supply amount and the hot water supply temperature on the second hot water supply means side, the set temperature of the hot water supply request, and the total hot water supply amount, and based on the hot water supply amount on the first hot water supply means side reduced to a predetermined range, The program according to claim 10, for causing the computer to execute the above.

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