JP2020063857A - Hot water supply system - Google Patents

Abstract

To realize a multiple capacity hot water supply system capable of dealing with hot water consumption which varies in capacity from small to large.SOLUTION: A hot water supply system comprises: hybrid hot water supply devices (4-1, 4-2,..., 4-N) which respectively have a first heat exchange section (HP unit 16) transferring heat of a heat medium to hot water stored in a hot water storage tank and a second heat exchange section (backup water heater 18) heating the hot water stored in the hot water storage tank; a circulation passage (10) where a plurality of hybrid hot water supply devices are connected in parallel to supply hot water to hot water consumption points therethrough; a circulation pump (24) which circulates the hot water through the circulation passage; a control section (hot water storage unit control section, HP control section and backup hot water heater control section) which activates either one or both of the first heat exchange section and the second heat exchange section; and multiple control means (multiple control section 34) which controls the first heat exchange section or the second heat exchange section and the circulation pump through the control section.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hot water supply system that uses together a hot water storage tank that stores hot water and a so-called hybrid hot water supply device that includes a plurality of heat exchange units having different heating sources.

Shared facilities such as hotels require a hot water supply system that can handle small to large hot water consumption. In this hot water supply system, it is necessary to have a plurality of heat source units installed side by side and a circulation circuit that can quickly respond to hot water consumption.
Regarding such a water heater system, it is known that a plurality of water heaters are connected in parallel by a circulation path for supplying water to a hot water destination, and each water heater is controlled by a common control unit (for example, Patent Document 1).
In addition, it is known that the hot water supply system is equipped with a hot water storage tank that stores hot water, and the lower layer water of this hot water storage tank is heated by a heat pump to return to the upper layer of the hot water storage tank, and the insufficient heat of the hot water storage tank is backed up and heated by a water heater. (For example, Patent Document 2).

JP, 2006-329576, A JP, 2013-133225, A

By the way, in the conventional hot water supply system (for example, Patent Document 1), since the hot water supply capacities of a plurality of water heaters are added, it is possible to control the hot water supply to consume a large amount of hot water, but There is a problem that it is proportional to the water heater and depends on the hot water supply function of each water heater.
The present inventor has found that if a hot water supply system is provided with a hot water storage tank (for example, Patent Document 2), the hot water storage function can be enhanced by utilizing the heat storage function of hot water stored in the hot water storage tank. However, even if a hot water storage tank is provided in one water heater, there is a problem that it is insufficient to cope with the consumption of hot water from a small capacity to a large capacity in a shared use facility such as a hotel.
Therefore, the present invention is to realize a multi-hot water supply system that copes with hot water consumption varying from a small capacity to a large capacity based on the above problems and the above knowledge.

Regarding such requirements and problems, there is no disclosure or suggestion in Patent Document 1 or Patent Document 2, and there is no disclosure or suggestion regarding a configuration or the like that solves them.

  To achieve the above object, according to one aspect of the hot water supply system of the present invention, the hot water storage tank is provided with a first heat exchange unit for exchanging heat of the heat medium with the hot water stored in the hot water storage tank, and A hybrid water heater having a second heat exchange unit for heating hot water, a circulation path connecting the plurality of hybrid water heaters in parallel to supply the hot water to a hot water demand point, and circulating the hot water in the circulation path. A circulating pump, a control unit that controls the operation of either or both of the first heat exchange unit and the second heat exchange unit, and the first heat exchange unit or the second unit through the control unit. And a multi-control means for controlling the circulation pump together with the control of the heat exchange section.

In this hot water supply system, the first heat exchange unit may be a heat pump unit that heats the hot water with a heat medium, and the second heat exchange unit may be a hot water supply device that heats the hot water with combustion heat. .
In this hot water supply system, the multi-control means may increase or decrease the number of the hybrid hot water supply devices to be driven or the number of suspensions thereof depending on the flow rate of the hot water flowing in the circulation path.
In this hot water supply system, in the hybrid water heater, the operating conditions of the second heat exchanging unit may differ from the operating conditions of the first heat exchanging unit.
In this hot water supply system, the multi-control means may increase or decrease the number of driven or suspended units of the hybrid water heater according to the hot water temperature of the hot water storage tank.
In this hot water supply system, the multi-control means may increase or decrease the number of hybrid water heaters to be driven or the number of pauses, depending on the operating time of the first heat exchange unit.

According to the hot water supply system of the present invention, one of the following effects can be obtained.
(1) Since each hybrid water heater has a multi-structure including the first and second heat exchange units, it is possible to supply a large amount of hot water and save energy.
(2) The number of installed hybrid water heaters can be adjusted according to the amount of hot water consumed, which is highly versatile for hot water consumption.
(3) Since each hybrid hot water supply device stores hot water in the hot water storage tank in advance, it has good responsiveness to hot water consumption, and can mix hot water and hot water in the hot water storage tank to supply hot water at a desired temperature.
(4) To increase or decrease the number of hybrid water heaters that are driven or suspended to respond to an increase or decrease in hot water supply consumption, it is possible to reduce the overoperation of the devices or the load on some devices, and increase or decrease the number of driven devices. Since it is performed based on the heat storage state and the operating time of the device, it is possible to prevent uneven operation time of the heat pump of the hybrid water heater.
(5) When the heat storage is insufficient, it can be operated by supplementing the heat storage by the second heat exchange section, so that interruption of hot water supply and fluctuation of hot water temperature can be prevented, and stable hot water supply can be realized.

It is a figure which shows the hot water supply system which concerns on 1st Embodiment. It is a figure which shows a hybrid water heater. It is a figure which shows the control part of a hybrid water heater. It is a figure which shows the multi-control part of a hot water supply system. It is a figure which shows a multi-management information file. It is a figure for explaining communication control by a multi-control part. It is a flow chart which shows the processing procedure of multi-control. It is a flowchart which shows the operation condition of the hybrid water heater by a multi-control part. It is a flow chart which shows control of a hybrid water heater. It is a flow chart which shows control of a heat pump unit. It is a flowchart which shows the heat storage control of a hybrid water heater.

[First Embodiment]
FIG. 1 shows a hot water supply system according to the first embodiment. The configuration shown in FIG. 1 is an example, and the present invention is not limited to such a configuration.
The hot water supply system 2 is provided with a plurality of hybrid hot water supply devices, such as hybrid hot water supply devices 4-1, 4-2, ..., 4-N, and a common pump unit 6 and a multi-control unit 8. The hybrid water heaters 4-1, 4-2, ..., 4-N are connected in parallel by the circulation path 10 and supply hot water to the hot water demand point 12. The hot water supply demand point 12 is provided with a faucet for supplying hot water.

  Each of the hybrid water heaters 4-1, 4-2, ..., 4-N is individually provided with a hot water storage unit 14, a heat pump unit 16, and a backup water heater 18. The hot water storage unit 14 stores hot water HW for hot water supply to the hot water supply demanding place 12 through the circulation path 10. Hereinafter, the heat pump is referred to as “HP”. The HP unit 16 is an example of a first heat exchange unit, and exchanges heat of the heat medium with the hot water HW stored in the hot water storage unit 14. The backup water heater 18 is an example of a second heat exchange unit, and performs backup heating of the hot water HW stored in the hot water storage unit 14.

<Pump unit 6>
The pump unit 6 is installed on the downstream side of the circulation path 10, that is, on the side where the hot water HW is drawn from the hot water supply demand point 12. The pump unit 6 is provided with a temperature sensor 20, an expansion tank 22, a circulation pump 24, a check valve 26, and a steam separator 28. The temperature sensor 20 detects the temperature of the hot water HW circulating from the hot water supply demand point 12 side to the hybrid hot water supply devices 4-1, 4-2, ..., 4-N, and the detected temperature is provided to the multi-control unit 8. It
The expansion tank 22 absorbs the expansion of the hot water HW circulating in the circulation path 10. The circulation pump 24 circulates the hot water HW in the circulation path 10.
The check valve 26 is a means for restricting the circulation direction of the hot water HW circulating in the circulation path 10. In this example, that is, when the circulation pump 24 is driven, the hybrid water heaters 4-1 and 4-2 ,. The hot water HW circulates from the 4-N through the hot water supply demand point 12 to the hybrid water heaters 4-1, 4-2, ..., 4-N.
The steam separator 28 separates bubbles mixed with the warm water HW circulating in the circulation path 10 from the warm water HW and discharges the bubbles to the outside air.

<Supply of clean water W>
Tap water such as tap water is supplied to the circulation path 10 via a check valve 30. The check valve 30 is means for preventing the hot water HW flowing through the circulation path 10 from flowing back into the clean water side conduit 32.

<Multi control unit 8>
The multi-control unit 8 is an example of multi-control means. The multi-control unit 8 includes a multi-control unit 34, controls hot water supply of each of the hybrid hot water supply devices 4-1, 4-2, ..., 4-N, and hybrid hot water supply devices 4-1 and 4-2. The control such as controlling any or all of 4-N in the drive state or the rest state is performed. The temperature information detected by the temperature sensor 20 of the pump unit 6 is input to the multi-control unit 34, and the control output of the multi-control unit 34 is input to the circulation pump 24. The multi-control unit 34 includes a hot water storage unit control unit 36 (FIG. 3) of the hybrid water heaters 4-1, 4-2, ..., 4-N, an HP control unit 38 (FIG. 3), a backup water heater control unit 40. (FIG. 3), the drive of the hybrid water heaters 4-1, 4-2, ..., 4-N is controlled. In this drive control, in order to respond to the hot water supply consumption of the hot water supply demand point 12, control such as making any or all of the hybrid water heaters 4-1, 4-2, ... included.

<Hybrid hot water supply device 4-1, 4-2, ..., 4-N>
Hybrid water heater 4 shown in FIG. 2 is installed in each of the hybrid water heaters 4-1, 4-2, ..., 4-N.
The hot water HW is stored in the hot water storage unit 14, the hot water is supplied to the circulation path 10 from the hot water supply path 42, and the clean water W or the hot water HW from the circulation path 10 is received in the water supply path 44.
The hot water HW of the hot water storage unit 14 is circulated to the HP unit 16 for heating, and circulated to the backup water heater 18 for heating. That is, the hot water HW of the hot water storage unit 14 is supplemented with the insufficient heat quantity by the backup water heater 18.

<Supply of hot water W or hot water HW or hot water supply>
The hot water storage unit 14 is provided with a hot water storage tank 48, and clean water W or warm water HW is supplied to the lowermost layer portion of the hot water storage tank 48 by a water supply passage 44. In the hot water storage tank 48, a plurality of temperature sensors 50-1, 50-2, 50-3, 50-4, 50-5 are arranged on the lower layer side than the upper layer side, and the hot water temperature from the upper layer side to the lower layer side is detected. To be done. The water supply passage 44 is provided with a temperature sensor 50-6, a water amount sensor 52, a pressure reducing valve 54, a check valve 56, a mixing control valve 58, and a check valve 60. The temperature sensor 50-6 detects the feed water temperature. The water amount sensor 52 detects the amount of water supplied to the hot water storage unit 14. The pressure reducing valve 54 reduces the pressure on the water supply passage 44 side. The check valve 56 prevents the backflow of the clean water W.

The mixing regulating valve 58 is provided with a mixing valve 58-1 on the water supply passage 44 side and a regulating valve 58-2 on the hot water supply passage 42 side. The mixing valve 58-1 adjusts the distribution amount of the clean water W or the warm water HW from the water supply passage 44 side to the bypass passage 62 side and the hot water storage tank 48 side, and adjusts the mixing amount to the hot water supply passage 42 side.
The check valve 60 prevents the hot water HW from flowing back from the hot water storage tank 48 side to the water supply passage 44.
A decompression relief valve 64 and temperature sensors 50-7 and 50-8 are installed in the hot water supply passage 42. Further, a temperature sensor 50-9 for detecting the outside air temperature is installed in the hot water storage unit 14.

<HP hot water supply of warm water HW>
HP hot water supply is performed by circulating the hot water HW of the hot water storage unit 14 through the hot water circulation path 66 to the HP unit 16. In the hot water circulation path 66, the hot water HW is circulated from the lower layer of the hot water storage unit 14 to the heat exchanger 68 to exchange the heat of the heat medium with the hot water HW. In the hot water circulation path 66, a circulation pump 70, temperature sensors 50-10 and 50-11, a switching valve 72 on the hot water storage unit 14 side, and temperature sensors 50-12 and 50-13 on the HP unit 16 side are installed. The circulation pump 70 takes out the hot water HW from the hot water storage tank 48 and circulates it through the hot water circulation path 66. The temperature sensor 50-10 detects the temperature of the hot water HW taken out of the hot water storage tank 48. The temperature sensor 50-11 detects the temperature of the hot water HW heated by the HP unit 16. The switching valve 72 selectively switches between flowing the hot water HW heated by the HP unit 16 into the bypass passage 74 and circulating the hot water HW again in the hot water circulation passage 66 or returning it to the hot water storage tank 48.
The temperature sensor 50-12 detects the hot water temperature on the inlet side of the heat exchanger 68, and the temperature sensor 50-13 detects the hot water temperature on the outlet side of the heat exchanger 68.

  The heat exchanger 68 exchanges the temperature of the heat medium flowing through the heat medium circulation path 76 with the hot water HW. A compressor 78, a heat exchanger 80, an air heat exchanger 82, an expansion valve 84, and temperature sensors 50-14, 50-15, 50-16 are installed in the heat medium circulation path 76. The compressor 78 pressurizes the heat medium and circulates it in the heat medium circulation path 76. The heat exchanger 80 exchanges heat between the heat medium before passing and the heat medium after passing through the air heat exchanger 82. The air heat exchanger 82 exchanges heat between the heat medium and air. The air heat exchanger 82 is provided with a fan 86 to promote heat dissipation of the heat medium in the air heat exchanger 82. The expansion valve 84 absorbs expansion of the heat medium circulating in the heat medium circulation path 76. The temperature sensor 50-14 detects the outside air temperature. The temperature sensor 50-15 detects the temperature of the heat medium on the outlet side of the air heat exchanger 82. The temperature sensor 50-16 detects the temperature of the heat medium on the output side of the compressor 78.

<Backup hot water for hot water HW>
The hot water HW of the hot water storage tank 48 is circulated to the backup water heater 18 by the backup circulation path 88, and the shortage of heat in the upper layer portion of the hot water HW is supplemented by the backup hot water.
The backup water heater 18 is provided with heat exchangers 90 and 92 for exchanging heat of a combustion source with the hot water HW flowing through the backup circulation path 88. A burner 94 is provided as a combustion source and burns the fuel gas G, for example. The heat exchanger 90 is, for example, a secondary heat exchanger, and mainly exchanges the latent heat of the combustion exhaust gas with the hot water HW. The heat exchanger 92 is, for example, a primary heat exchanger, and mainly exchanges sensible heat of combustion exhaust with the hot water HW after the heat exchange of the heat exchanger 90.

The backup circulation path 88 is provided with temperature sensors 50-17, 50-18, 50-19, 50-20, a flow rate sensor 96, a mixing regulation valve 98, a circulation pump 99, and a switching valve 101. The temperature sensor 50-17 detects the inlet temperature of the hot water HW circulating in the backup water heater 18. The temperature sensor 50-18 detects the outlet temperature of the hot water HW heated by the backup water heater 18. The temperature sensor 50-19 detects the temperature of the hot water HW discharged from the heat exchanger 92. The temperature sensor 50-20 detects the temperature of the hot water HW entering the hot water storage unit 14. The flow rate sensor 96 detects the flow rate of the warm water HW entering the backup water heater 18.
The mixing control valve 98 is provided with a mixing valve 98-1 on the input side of the heat exchanger 90 and a control valve 98-2 on the output side of the heat exchanger 92. The regulation valve 98-2 regulates the hot water HW flowing from the backup water heater 18 to the backup circulation path 88. The mixing valve 98-1 adjusts the mixing amount of the hot water HW before heat exchange and the hot water HW after heat exchange.

  The circulation pump 99 circulates the warm water HW in the middle layer of the hot water storage tank 48 to the backup circulation path 88. The switching valve 101 switches between flowing the hot water HW heated by the backup hot water supply device 18 into the bypass passage 103 and recirculating it to the hot water circulation passage 88 or returning it to the upper layer portion of the hot water storage tank 48.

<Hot water storage unit controller 36>
FIG. 3 shows the configuration of the hot water storage unit controller 36, the relationship between the hot water storage unit controller 36, the HP controller 38, the backup water heater controller 40, and the multi controller 34.
A computer having a communication function is used as the hot water storage unit control unit 36, and includes a processor 102, a memory 104, a multi communication unit 106, a hybrid communication unit 108, and an input / output unit (I / O) 110. The processor 102 executes a program stored in the memory 104 to perform information processing such as hot water storage control of the hot water storage unit 14. The memory 104 is a storage unit that stores programs and the like, and includes storage elements such as a ROM (Read-Only Memory), a RAM (Random-Access Memory), and an EEPROM (Electrically Erasable Programmable Read-Only Memory). The multi-communication unit 106, under the control of the processor 102, communicates with the multi-control unit 34 and exchanges information necessary for multi-control and the like. Under the control of processor 102, hybrid communication unit 108 exchanges information with HP control unit 38 and backup water heater control unit 40.
The I / O 110 takes in the temperature detected by the temperature sensors 50-1 and 50-2 and the water amount detected by the water amount sensor 52 under the control of the processor 102, and outputs a control signal to the circulation pumps 70 and 99.

<Multi controller 34>
FIG. 4 shows the configuration of multi-control unit 34 and the relationship between multi-control unit 34, hybrid water heaters 4-1, 4-2, ..., 4-N and remote control device 112. 4, the same parts as those in FIG. 3 are designated by the same reference numerals.
A computer having a communication function is used for the multi-control unit 34, and includes a processor 114, a memory 116, a remote control communication unit 118, a hot water supply device communication unit 120, and an I / O 122. Processor 114 executes a multi-control program or the like stored in memory 116 and performs multi-control such as selection control of hybrid water heaters 4-1, 4-2, ..., 4-N. The memory 116 stores programs such as a multi-control program and data, and is composed of storage elements such as ROM, RAM, and EEPROM. The remote control communication unit 118 communicates with the remote control device 112. In the memory 116, a multi-management information file 144 (FIG. 5) and a multi-communication information file 145-1 that store control information of the hybrid water heaters 4-1, 4-2, ..., 4-N, HP unit 16 and the like. (A in FIG. 6) and 145-2 (B in FIG. 6) are stored.

  The hot water supply device communication unit 120 communicates with the hybrid hot water supply devices 4-1, 4-2, ..., 4-N, and transmits / receives information necessary for multi-control. The I / O 122 is connected to the temperature sensor 20, the circulation pump 24, the input unit 124, and the display unit 126. Control information necessary for multi-control is input to the input unit 124 by an interface device such as a keyboard. The control contents are displayed on the display unit 126 by a display means such as an LCD (Liquid Crystal Display). The temperature detected by the temperature sensor 20 is captured by the I / O 122 under the control of the processor 114. A drive signal for responding to the hot water supply demand from the I / O 122 to the hot water supply demand point 12 is output to the circulation pump 24.

  The remote control device 112 is an operating device that is installed side by side with the multi-control unit 8 (FIG. 1). The remote control device 112 is provided with a remote control controller 128. The remote controller control unit 128 is composed of a computer having a communication function, and includes a processor 130, a memory 132, a communication unit 134, and an I / O 136. The processor 130 performs information processing such as control according to an operation input of the switch 138 connected to the I / O 136, control output of multi-control, and fetching of information. The memory 132 stores programs such as a remote controller control program and data, and is composed of storage elements such as ROM, RAM, and EEPROM. The communication unit 134 communicates with the remote controller communication unit 118 of the multi-control unit 34. A switch 138 and an LED (Light Emitting Diode) 140 liquid crystal display unit 142 are connected to the I / O 136. The switch 138 includes a power switch, a control selection switch, and the like. The LED 140 is an indicator that lights up when driven. The liquid crystal display unit 142 is an example of information presenting means, and is used for displaying images of input information and control information.

<Multi management information file 144>
In the multi-management information file 144, as shown in FIG. 5, the number section 146, the connection status section 148 of the hybrid water heaters 4-1, 4-2, ..., 4-N, the drive status section 150, the water flow rate section. A heat storage status section 154 and an operating time section 156 are provided.
The serial number 1, 2, ..., N, which is the identification information of the management information, is stored in the number portion 146. The connection status part 148 stores identification information of the hybrid water heaters 4-1, 4-2, ..., 4-N connected to the circulation path 10. For example, in the case of the hybrid water heaters 4-1, 4-2, 4-3, 4-4 connected to the circulation path 10, the identification information for identifying these is "4-1, 4-2, 4-. 3, 4-4 ”is stored. If the connection is not established, "0" is stored.
Drive statuses of hybrid water heaters 4-1, 4-2, ..., 4-N (0: pause, 1: drive) are stored in drive status section 150. The water flow rate unit 152 stores the water flow rate of each of the hybrid water heaters 4-1, 4-2, ..., 4-N (the detected value of the water flow rate sensor 52: liter / min).
The heat storage status section 154 stores the heat storage status of the hot water storage tank 48 (0: no heat storage, 1: heat storage). The operating time of the HP unit 16 (integrated value H) is stored in the operating time portion 156.

<Multi-communication information file 145-1>
The multi-communication information file 145-1 stores the contents of communication directed from the multi-control unit 34 to the hybrid water heaters 4-1, 4-2, ..., 4-N. As a result, the multi-control unit 34 notifies the hybrid water heaters 4-1, 4-2, ..., 4-N of a drive instruction or a rest instruction.
This multi-communication information file 145-1 is provided with a hybrid water heater unit 158 and a drive status unit 160, as shown in FIG. 6A. Hybrid hot water supply device section 158 stores identification information of hybrid hot water supply devices 4-1, 4-2, ..., 4-N.
The drive status section 160 stores information indicating the drive status of the hybrid water heaters 4-1, 4-2, ..., 4-N. In other words, this drive status is information representing a drive instruction from the multi-control unit 34 to the hybrid hot water supply devices 4-1, 4-2, ..., 4-N.

<Multi-communication information file 145-2>
The multi-communication information file 145-2 stores the contents of communication directed from the hybrid water heaters 4-1, 4-2, ..., 4-N to the multi-control unit 34. As a result, the hybrid hot water supply devices 4-1, 4-2, ..., 4-N notify the multi-control unit 34 of information regarding the own device.
As shown in FIG. 6B, the multi-communication information file 145-2 includes a hybrid water heater unit 162, a drive status unit 164, a water flow rate unit 166, a heat storage status unit 168, and an HP operating time unit 170.
Hybrid hot water supply device section 162 stores identification information of hybrid hot water supply devices 4-1, 4-2, ..., 4-N.

The drive status section 164 stores information indicating the drive status of the hybrid water heaters 4-1, 4-2, ..., 4-N. That is, this drive status is different from the multi-communication information file 145-1, and represents the drive status of the self-device directed from the hybrid water heaters 4-1, 4-2, ..., 4-N to the multi-control unit 34. Information.
The water flow rate unit 166 stores the water flow rates of the hybrid water heaters 4-1, 4-2, ..., 4-N. This water flow rate is a detection value of the water volume sensor 52 of the hybrid water heaters 4-1, 4-2, ..., 4-N.

The heat storage status section 168 stores information indicating the heat storage status of the hot water storage tank 48. In the hybrid water heaters 4-1, 4-2, ..., 4-N, for example, the temperature is detected by the temperature sensor 50-3. If the detected temperature is a predetermined temperature, for example, 63 ° C. or higher, heat is accumulated (: 1) If the temperature detected by the temperature sensor 50-2 is lower than a predetermined temperature, for example, 63 ° C., no heat storage is performed (: 0). That is, whether or not heat is accumulated is determined by the temperature detected by the temperature sensor 50-3, and whether or not heat is accumulated is determined by the temperature detected by the temperature sensor 50-2. In this way, the temperature detected by the temperature sensor 50-3 on the lower layer of the hot water storage tank 48 is used to determine the presence of heat, and the temperature detected by the temperature sensor 50-2 on the upper layer of the hot water storage tank 48 is used to determine the absence of heat. Therefore, hunting for driving / pausing the hybrid water heater 4 due to the determination result is prevented.
The HP operating time section 170 stores information indicating the operating time of the HP unit 16. This operating time is integrated by heat storage control (FIG. 10) by the HP unit 16.
The contents of these multi-communication information files 145-2 are used by being reflected in the multi-management information file 144.

<Control by multi-control unit 34>
FIG. 7 shows a processing procedure of control by the multi-control unit 34. In this processing procedure, S indicates a process, and the number attached to S indicates its order.
In multi-control, the multi-control unit 34 performs transmission / reception with the hybrid hot water supply devices 4-1, 4-2, ..., 4-N (S101), and the hybrid hot water supply devices 4-1, 4-2 ,. , 4-N, the situation determination (FIG. 8) is performed based on the information acquired from the 4-N (S102).
As a result of this situation determination, the multi-control unit 34 determines whether or not it is necessary to increase the number of driven vehicles from the situations of the hybrid hot water supply devices 4-1, 4-2, ..., 4-N (S103).

When it is necessary to increase the number of drives (YES in S103), it is determined whether or not there is a device with heat storage during the suspension of the hybrid hot water supply devices 4-1, 4-2, ..., 4-N. Yes (S104).
When there is a device with heat storage during the suspension from the hybrid water heaters 4-1, 4-2, ..., 4-N (YES in S104), the HP unit 16 of the devices with heat storage is The hybrid water heater having the shortest operating time is selected, the hybrid water heater is driven (S105), and the process returns to S101.
If there is no device with heat storage while the hybrid water heaters 4-1, 4-2, ..., 4-N are at rest (NO in S104), the device with the shortest operating time of the HP unit 16 is selected. Then, the hybrid water heater is driven (S106), and the process returns to S101.

In S103, when it is not necessary to increase the number of drives (NO in S103), it is determined whether the number of drives needs to be decreased (S107).
If it is necessary to reduce the number of driven units (YES in S107), it is determined whether or not there is a device without heat storage in the hybrid water heater being driven (S108).
If there is a device without heat storage in the driving hybrid hot water supply device (YES in S108), the device without heat storage in the driving hybrid hot water supply device is put into a rest state (S109), and the process returns to S101.
When there is no device that is being driven and does not store heat (NO in S108), the device having the longest operating time of the HP unit 16 is set to a rest state from the hybrid water heater that is being driven (S110), and the process returns to S101.

In S107, when it is not necessary to reduce the number of driven units (NO in S107), it is determined whether or not there is no heat storage in the hybrid water heater being driven (S111).
When no heat storage occurs in the hybrid hot water supply apparatus being driven (YES in S111), it is determined whether or not there is a heat storage apparatus in the stopped apparatus (S112).
When there is a device with heat storage during the suspension (YES in S112), a device with heat storage during the suspension is put into a driving state for a device with a short operating time of the HP unit 16 (S113), and heat is stored from the device in the operating state. The device with no connection is put into the sleep state (S114), and the process returns to S101.
Further, in S111, when no heat storage occurs in the hybrid hot water supply device being driven (NO in S111), the process returns to S101, and similarly, when there is no heat storage device in the resting device (( (NO of S112), and returns to S101.
In this processing procedure, the number of driven water heaters 4-1, 4-2, ..., 4-N is controlled on the basis of the drive state of the hybrid water heaters 4-1, 4-2 ,. The process of controlling the number of suspended units may be performed based on the suspended state of 4-N.

<Judgment of hot water supply system status>
FIG. 8 shows a processing procedure for determining the situation of the hot water supply system 2. In this processing procedure, the total water flow rate (Tw) flowing through the circulation path 10 is calculated from the water flow rates of the hybrid water heaters 4-1, 4-2, ..., 4-N (S201). To calculate the total water flow rate, the water flow rates stored in the multi-management information file 44 (FIG. 5) and the multi-communication information file 145-2 (B in FIG. 6) may be used.
Here, the increased switching flow rate per hybrid hot water supply device is set to Hw. The switching flow rate Hw is approximately 80% of the maximum value. Similar processing is performed when the switching flow rate Hw decreases.
For the total water flow rate Tw, it is determined whether or not the total water flow rate Tw> (the number of drives × HW) (S202).
If the total water flow rate Tw> (the number of driving units × HW) (YES in S202), it is determined that the number of driving units needs to be increased (S203), and the process returns to S103 (FIG. 7) (S204).

If the total water flow rate Tw> (the number of driven units × HW) is not satisfied (NO in S202), it is determined whether or not the number of driven units = 1 (S205). If the number of driven vehicles is 1 (YES in S205), it is determined that the number of driven vehicles is not changed (S206), and the process returns to S103 (FIG. 7) (S204).
If the number of driven vehicles is not 1 in S205 (NO in S205), it is determined whether the number of driven vehicles is 2 (S207).
If the number of driven vehicles is not 2 (NO in S207), it is compared with the increase condition when there are two less vehicles, that is, it is determined whether Tw ≦ {(number of driven vehicles-2) × Hw} (S208). If Tw ≦ {(number of driven vehicles-2) × Hw} (YES in S208), it is determined that the number of driven vehicles needs to be reduced (S209), and the process returns to S103 (FIG. 7) (S204).
If the number of driven vehicles = 2 (YES in S207), it is determined whether Tw ≦ (Hw × 0.6) (S210). If Tw ≦ (Hw × 0.6) (YES in S210), S208 is skipped, it is determined that the number of driven vehicles needs to be reduced (S209), and the process returns to S103 (FIG. 7) (S204). If Tw ≦ (Hw × 0.6) is not satisfied (NO in S210), it is determined that the number of driven vehicles is not changed (S206), and the process returns to S103 (FIG. 7) (S204).

<Control in hybrid water heaters 4-1, 4-2, ..., 4-N>
FIG. 9 shows a processing procedure of control in the hybrid water heaters 4-1, 4-2, ..., 4-N.
Each of the hybrid water heaters 4-1, 4-2, ..., 4-N exchanges information with the multi-control unit 34 to exchange information (S301).
As a result of this information exchange, it is determined whether or not there is a pause instruction from the multi-control unit 34 (S302). If there is a pause instruction (YES in S302), the mixing control valve 58-2 is closed (S303). If there is no pause instruction (NO in S302), it is determined whether there is a drive instruction (S304). If there is a drive instruction (YES in S304), the mixing control valve 58-2 is opened (S305), and if there is no drive instruction (NO in S304), S305 is skipped.

In this control state, it is determined whether the water amount sensor 52 is ON (S306). If the water amount sensor 52 = ON (YES in S306), the hot water outlet temperature is controlled to the hot water supply set temperature. That is, the opening degree of the mixing valve 58-1 is adjusted so that the temperature detected by the temperature sensor 50-8 becomes the hot water supply set temperature (S307).
Then, heat storage control by the HP unit 16 (FIG. 10) is performed (S308), and heat storage control by the backup water heater 18 (FIG. 11) is performed (S309).

<Heat storage control by HP unit 16>
FIG. 10 shows a processing procedure of HP heat storage control. In this processing procedure, it is determined whether the HP unit is stopped (S401).
If the HP unit is stopped (YES in S401), it is determined whether the detected temperature T5 of the temperature sensor 50-5 <TM (45 ° C) (S402). If T5 <TM (45 ° C.) (YES in S402), heat storage in the HP unit 16 is started (S403). That is, the drive of the circulation pump 70 is started, and the HP unit 16 is started.
Accumulation of the operating time of the HP unit 16 is started (S404), and the process returns to S308 (FIG. 9) (S405).

If the HP unit 16 is not stopped in S401 (NO in S401), it is determined whether the temperature T10 ≧ TM (45 ° C.) detected by the temperature sensor 50-10 is satisfied (S406). If T10 ≧ TM (45 ° C.) (YES in S406), the heat storage of the HP unit 16 is stopped (S407). That is, the drive of the circulation pump 70 is stopped and the HP unit 16 is stopped.
The integration of the operating time of the HP unit 16 is stopped (S408), and the process returns to S308 (FIG. 9) (S405).

If T10 ≧ TM (45 ° C.) in S406 (NO in S406), the rotation speed of the circulation pump 70 is controlled so that the temperature T11 detected by the temperature sensor 50-11 becomes TM (65 ° C.) (S409). .
The operating time of the HP unit 16 is integrated (S410), and the process returns to S308 (FIG. 9) (S405).

<Heat storage control by backup water heater 18>
FIG. 11 shows a processing procedure of heat storage control by the backup water heater 18.
In this processing procedure, it is determined whether the backup water heater 18 is stopped (S501). If the backup water heater 18 is stopped (YES in S501), it is determined whether the temperature T1 detected by the temperature sensor 50-1 is lower than a predetermined temperature, for example, 63 ° C, that is, T1 <63 ° C (T1 <63 ° C). S502).
If T1 <63 ° C., heat storage by the backup water heater 18 is started, driving of the circulation pump 99 is started (S503), and the process returns to S309 (FIG. 9) (S504).
By starting driving the circulation pump 99, the hot water outlet temperature of the backup water heater 18 is controlled to the set temperature. That is, the backup water heater 18 is controlled so that the temperature T18 detected by the temperature sensor 50-18 becomes a predetermined temperature, for example, 65 ° C.

If the backup water heater 18 is not stopped in S501 (NO in S501), it is determined whether the temperature T2 detected by the temperature sensor 50-2 is equal to or higher than a predetermined temperature, for example, 63 ° C., that is, T2 ≧ 63 ° C. A judgment is made (S505).
If T2 ≧ 63 ° C. (YES in S505), heat storage by the backup water heater 18 is stopped, driving of the circulation pump 99 is stopped (S506), and the process returns to S309 (FIG. 9) (S504).

  In S505, if T2 ≧ 63 ° C. is not satisfied (NO in S505), as the heat storage operation by the backup water heater 18, the rotation speed of the circulation pump 99 is set to a rotation speed at which the backup water heater 18 can supplement the heat storage consumed by the hot water supply. The control is performed (S507), and the process returns to S309 (FIG. 9) (S504).

<Effect of one embodiment>
According to this one embodiment, one of the following effects can be obtained.
(1) Each of the hybrid water heaters 4-1, 4-2, ..., 4-N is capable of supplying a large amount of hot water because it has a multi-structure including the first and second heat exchanging portions and is energy-saving. Can be realized.
(2) Since the hybrid water heaters 4-1, 4-2, ..., 4-N store hot water in advance, they have good responsiveness to consumption.

(3) Hot water can be supplied by mixing the hot water HW and the water supply W in the hot water storage tank 48 to create a desired hot water supply temperature.
(4) To increase or decrease the number of hybrid hot water supply devices 4-1, 4-2, ..., 4-N that are driven or stopped in response to an increase or decrease in hot water supply consumption, over-operation of the device or some devices It is possible to prevent the load from being biased against.
(5) When the number of hybrid water heaters 4-1, 4-2, ..., 4-N driven is increased or decreased, the heat storage state is used as the condition for selecting the device, and the length of the heat pump operating time of the device is changed. The conditions for selection can be set, and efficient operation can be realized.
(6) The operating time of the HP units 16 of the hybrid water heaters 4-1, 4-2, ..., 4-N is not biased, and the life of the HP units 16 of the system 2 can be extended.

[Second Embodiment]
In the first embodiment, the HP unit 16 is set in the first heat exchange section and the backup water heater 18 is set in the second heat exchange section to realize the hybridization. The backup water heater 18 may be set in the exchange section, and the HP unit 16 may be set in the second heat exchange section so as to be hybridized, and the HP unit 16 may perform complementary hot water supply.
As shown in FIG. 2, the backup water heater 18 uses the primary heat exchanger 90 and the secondary heat exchanger 92 to realize a highly efficient water heater, and the backup water heater 18 serves as the main water heater and the HP unit 16 Even if is set to the auxiliary hot water supply, a large amount of hot water can be realized with high efficiency.

[Other Embodiments]
(1) In the first embodiment, a high-efficiency water heater is realized by using the secondary heat exchanger 90 and the primary heat exchanger 92, but a hot water supply device using only the primary heat exchanger 92 is used for backup. The water heater 18 may be configured.
(2) In the first and second embodiments, the HP unit 16 is used as the second heat exchange section, but a hot water supply unit using an exhaust heat source such as a fuel cell as a heat source may be used.
(3) The hot water supply system may be installed not only in a house but also in transportation means such as a camper, a ship, and a railroad.

As described above, the most preferable embodiment of the present invention has been described. The present invention is not limited to the above description. Various modifications and changes can be made by those skilled in the art based on the gist of the invention described in the claims or the mode for carrying out the invention. It goes without saying that such modifications and changes are included in the scope of the present invention.

The hot water supply system of the present invention is a hybrid hot water supply including a first heat exchange section for exchanging heat of the heat medium with the hot water stored in the hot water storage tank, and a second heat exchange section for heating the hot water in the hot water storage tank. It is useful because it is possible to construct a system that includes a device and can cope with hot water consumption such as in a hotel that changes from a small capacity to a large capacity.

2 Hot water supply system 4, 4-1, 4-2, ..., 4-N Hybrid hot water supply device 6 Pump unit 8 Multi-control unit 10 Circulation path 12 Hot water demand point 14 Hot water storage unit 16 Heat pump unit 18 Backup water heater 20 Temperature sensor 22 Expansion Tank 24 Circulation Pump 26 Check Valve 28 Steam Separator 30 Check Valve 32 Water Supply Side Pipe 34 Multi-Control Section 36 Hot Water Storage Unit Control Section 38 Heat Pump Control Section 40 Backup Water Heater Control Section 42 Hot Water Supply Channel 44 Water Supply Channel 48 hot water storage tanks 50-1, 50-2, 50-3, 50-4, 50-5, 50-6, 50-7, 50-8, 50-9, 50-10, 50-11, 50-12 , 50-13, 50-14, 50-15, 50-16, 50-17, 50-18, 50-19, 50-20 temperature sensor -52 Water amount sensor 54 Pressure reducing valve 56 Check valve 58 Mixing control valve 60 Check valve 62 Bypass passage 64 Pressure reducing relief valve 66 Hot water circulation passage 68 Heat exchanger 70 Circulation pump 72 Switching valve 74 Bypass passage 76 Heat medium circulation passage 78 Compressor 80 Heat Exchanger 82 Air Heat Exchanger 84 Expansion Valve 86 Fan 88 Backup Circulation 90, 92 Heat Exchanger 94 Burner 96 Flow Rate Sensor 98 Mixing Control Valve 98-1 Mixing Valve 98-2 Control Valve 99 Circulating Pump 100 Bypass 101 Switching valve 102 Processor 104 Memory 106 Multi communication unit 108 Hybrid communication unit 110 Input / output unit (I / O)
112 Remote Control Device 114 Processor 116 Memory 118 Remote Control Communication Unit 120 Hot Water Supply Device Communication Unit 122 I / O
124 input unit 126 display unit 128 remote controller control unit 130 processor 132 memory 134 communication unit 136 I / O
138 switch 140 LED
142 liquid crystal display section 144 multi-management information file 145-1, 145-2 multi-communication information file 146 number section 148 connection status section 150 drive status section 152 water flow rate section 154 heat storage status section 156 operating time section 158 hybrid water heater unit 160 drive Situation part 162 Hybrid water heater unit 164 Drive condition part 166 Water flow amount part 168 Heat storage condition part 170 HP operating time part

Claims (6)

A hybrid water heater including a first heat exchange unit for exchanging heat of a heat medium with the hot water stored in the hot water storage tank, and a second heat exchange unit for heating the hot water in the hot water storage tank,
A circulation path for connecting the plurality of hybrid water heaters in parallel to supply the hot water to hot water demand points,
A circulation pump for circulating the hot water in the circulation path,
A control unit that controls the operation of either or both of the first heat exchange unit and the second heat exchange unit;
Multi-control means for controlling the circulation pump together with the control of the first heat exchange section or the second heat exchange section through the control section;
A hot water supply system comprising:
The first heat exchange unit is a heat pump unit that heats the hot water with a heat medium, and the second heat exchange unit is a hot water supply device that heats the hot water with combustion heat. The hot water supply system according to 1.
The hot water supply system according to claim 1, wherein the multi-control unit increases or decreases the number of hybrid water heaters to be driven or the number of paused hybrid water heaters depending on the flow rate of the hot water flowing through the circulation path.
4. The hybrid water heater according to claim 1, wherein an operating condition of the second heat exchanging unit is different from an operating condition of the first heat exchanging unit. Hot water supply system described.
The hot water supply system according to any one of claims 1 to 4, wherein the multi-control unit increases or decreases the number of hybrid water heaters to be driven or the number of hybrid water heaters to be stopped depending on the hot water temperature of the hot water storage tank.
6. The multi-control means increases or decreases the number of hybrid water heaters to be driven or the number of paused heaters according to the operating time of the first heat exchange unit. Hot water supply system described in.

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