JP2012180962A - Water heater system having hot water storage tank with auxiliary heat source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that if heating of hot water for hot-water heating and supply of hot water for hot water supply are simultaneously performed in a conventional water heater system having a hot water storage tank with an auxiliary heat source, an auxiliary heat source machine for hot water heating is brought into a state of constant driving even during hot water supply, causing a problem in the energy-saving property.SOLUTION: The water heater system 1 having the hot water storage tank with the auxiliary heat source includes: an inside circulation path which is branched at an outlet side of an auxiliary heat source machine 15 and is returned to the inlet side; a hot water supply part for supplying hot water stored in a hot water storage tank 70 from the outlet side of the auxiliary heat source machine 15; a heating hot water supply part using the auxiliary heat source machine 15 as a heating source to indirectly heat a hot water heating device 5 through the inside circulation path; and a switching means 80 which if a temperature of hot water stored in the hot water storage tank 70 is a predetermined temperature or more, switches to a flow path 81 for bypassing to a downstream side of a diverging part of the inside circulation circuit, at the outlet side of the auxiliary heat source machine without passing through the auxiliary heat source machine 15 from the upstream side of a merging part of the inside circulation circuit, at the inlet side of the auxiliary heat source machine 15.

Description

  The present invention combines a hot water storage tank that is slowly heated using an external heat source such as a cogeneration heat source, a solar heat source, a heat pump heat source, and the like, and an auxiliary heat source machine that supplementarily heats the hot water stored in the hot water storage tank. The present invention relates to a hot water storage tank water supply system with an auxiliary heat source that can be used for heating and hot water heating.

  Conventionally, in hot water storage tank hot water supply systems with an auxiliary heat source, the amount of heat consumed and the scale of equipment are optimized in the hot water generated by energy-saving systems such as cogeneration hot water systems, solar systems, and heat pump hot water systems. In order to use it, the heat amount used for one day was generally stored in a hot water storage tank over 6 hours to half a day. Therefore, the amount of hot water that can be stored in a hot water storage tank has an upper limit due to the system configuration, and because of the nature of the heat source that also uses heating of the hot water storage tank, it is slow heating. could not.

  For this reason, on the downstream side of the slowly heated hot water storage tank, the amount of water held in the heat exchanger using liquid fuel, gaseous fuel, electric heater, etc. as the heating source is small compared to the heat amount of the heating source. It was necessary to provide a heat source machine to make it a system that can quickly cope with the shortage of hot water stored in the hot water storage tank.

  It is also considered that the hot water storage tank water supply system with an auxiliary heat source is used for hot water heating and bathing, but the use of hot water heating is seasonal, so the hot water storage stores heat until the hot water heating. The hot water used in hot water heating is stored in the hot water storage tank because of the huge scale of equipment to be covered by hot water and the fact that hot water used in hot water heating must always be supplied with hot water. The hot water used for the hot water heating is a system in which the hot water heated to a high temperature by the auxiliary heat source device provided in the system is used instead of the system that actively uses the hot water. (Patent Document 1 and Patent Document 2)

JP 2003-21392 A JP 2004-53054 A

  However, in the hot water storage tank hot water supply system with an auxiliary heat source, when heating water for hot water heating and / or heating hot water for reheating and hot water supply for hot water supply are performed at the same time, Auxiliary heat source machine for heating hot water and / or reheating warm water is always in operation, and a hot water storage tank hot water supply system with an auxiliary heat source is used for hot water heating and / or reheating. When hot water is used, hot water that is heated by an auxiliary heat source machine is also used. Therefore, the utilization rate of the hot water in the hot water storage tank heated by an external heat source such as solar heat, which is excellent for energy saving, which is originally used for hot water supply, is reduced, and there is a problem in terms of energy saving.

  In order to solve the above problems, the following technical means are taken in the present invention.

The hot water storage tank hot water supply system with an auxiliary heat source according to the first aspect of the present invention has a tank water supply pipe at the bottom, a tank hot water supply pipe at the top, and a hot water storage tank that is slowly heated by an external heat source, and is connected downstream of the tank hot water supply pipe port. An auxiliary heat source device that supplementarily heats the hot water stored in the hot water storage tank, and an internal circulation circuit that branches between the outlet side of the auxiliary heat source device and returns between the tank hot water supply pipe and the inlet side of the auxiliary heat source device And an internal circulation pump provided in the middle of the internal circulation circuit, a bypass branching in the middle of the tank water supply pipe, and joining the suction side of the internal circulation pump, and provided in the middle of the bypass circuit An electric valve, a hot water supply part for supplying hot water stored in the hot water storage tank from the outlet side of the auxiliary heat source machine for hot water supply, and a heat exchanger by circulating the internal circulation pump using the auxiliary heat source machine as a heating source Warmth through A hot water supply unit for supplying hot water for use and / or reheating, and an auxiliary heat source machine without passing the auxiliary heat source machine from the upstream side of the junction of the internal circulation circuit on the inlet side of the auxiliary heat source machine. A bypass passage for bypassing on the outlet side downstream of the branch point of the internal circulation circuit, and switching means for switching to the bypass passage when the temperature of the hot water stored in the hot water storage tank is equal to or higher than a predetermined temperature Is provided.
The hot water storage tank hot water supply system with an auxiliary heat source according to a second aspect of the present invention is the hot water storage tank hot water supply system according to claim 1, wherein the temperature of the hot water stored in the hot water storage tank becomes lower than a predetermined temperature. During the predetermined time of switching to the flow path passing through the machine, the motor-operated valve is opened so that the detour is in communication.

By taking the technical means as described above, the following effects are obtained.
According to the first invention, on the inlet side of the auxiliary heat source machine, downstream of the branch point of the internal circulation circuit on the outlet side of the auxiliary heat source machine without passing the auxiliary heat source machine from the upstream side of the joining place of the internal circulation circuit. When the temperature of the hot water stored in the hot water storage tank and the bypass flow path bypassed to the side is equal to or higher than the predetermined temperature, a switching means for switching to the bypass flow path is provided, so that hot water heating and / or reheating is provided. Even when in use, there is an effect that the hot water in the hot water storage tank excellent in energy saving can be used without passing through the auxiliary heat source device.
According to the second invention, using the first invention, the temperature of the hot water stored in the hot water storage tank becomes lower than the predetermined temperature, and the switching means switches the flow path from the bypass flow path to the flow path passing through the auxiliary heat source unit for a predetermined time. During this period, the hot water temperature in the hot water storage tank is lowered by opening the motorized valve so that the detour communicates, and the hot water generated by the operation of the switching means when switching to the auxiliary heat source machine is temporarily stopped. It can have an erasing effect.

It is a schematic explanatory drawing of the hot water storage tank hot water supply system with an auxiliary heat source which concerns on this invention. It is operation | movement explanatory drawing in case the hot water supply operation only of the hot water storage tank of the hot water storage tank hot water supply system with an auxiliary heat source which concerns on this invention is performed. It is operation | movement explanatory drawing at the time of switching to the hot water supply operation to which an auxiliary heat source machine is added only from the hot water storage tank of the hot water storage tank hot water supply system with an auxiliary heat source which concerns on this invention. It is operation | movement explanatory drawing when the hot water supply operation to which the auxiliary heat source machine of the hot water storage tank hot water supply system with an auxiliary heat source which concerns on this invention was added is performed. It is operation | movement explanatory drawing when the heating operation of the hot water storage tank hot water supply system with an auxiliary heat source which concerns on this invention is performed. It is operation | movement explanatory drawing when the hot water supply operation and heating operation of the hot water storage tank hot water supply system with an auxiliary heat source which concern on this invention are performed simultaneously, and the hot water supply operation only of a hot water storage tank is performed. It is operation | movement explanatory drawing when the hot water supply operation and heating operation of the hot water storage tank hot water supply system with an auxiliary heat source which concern on this invention are performed simultaneously, and it switches to the hot water supply operation to which an auxiliary heat source machine is added only from a hot water storage tank. It is operation | movement explanatory drawing when the hot water supply operation and heating operation of the hot water storage tank hot water supply system with an auxiliary heat source which concern on this invention are performed simultaneously, and the hot water supply operation to which the auxiliary heat source machine was added is performed. It is a schematic explanatory drawing of the hot water storage tank with an auxiliary heat source of another Example which concerns on this invention.

  A mode for carrying out the invention will be specifically described with reference to FIGS. 1 to 8.

(Outline configuration)
The hot water storage tank supply system 1 with an auxiliary heat source according to the first embodiment shown in FIG. 1 is a system in which a hot water storage tank 70 that is slowly heated by an external heat source 90 and an auxiliary heat source unit 15 are combined. The external heat source 90 is, for example, a solar heat source, a heat pump heat source, a cogeneration heat source, etc. Heat is exchanged with hot water and stored in the hot water storage tank 70. Here, a solar heat source, a heat pump heat source, and a cogeneration heat source will be described.

  The solar heat source method uses water and a heat medium (for example, a solution in which a rust inhibitor is added to an antifreeze such as propylene glycol) in a heat collecting plate (solar panel) installed on a south-facing roof that is susceptible to solar radiation. By circulating naturally or forcibly, the water in the hot water storage tank 70 is slowly heated with the circulating water or heat medium to store heat.

  The heat pump type heat source method uses refrigerant generated by condensing alternative refrigerants such as CFC and carbon dioxide with a compressor and condensing the refrigerant. Unlike the electric water heater, the refrigerant is circulated. Therefore, it is a heat source that can use heat energy that is greater than the electric energy to be input. By forcibly circulating water or a heat medium in the heat exchanger that receives heat generated by the condenser of the refrigeration cycle, the water in the hot water storage tank 70 is slowly heated with the circulating water or heat medium to store heat. To do.

  The method using a cogeneration heat source uses heat generated during power generation. The cogeneration heat source is generally referred to as a combined heat and power system. As a power generation method, there are a fuel cell system and an engine system using gas, liquid fuel, or the like as fuel. In either case, heat is generated during power generation, and water or heat medium is forced inside the heat exchanger (water jacket) that is installed outside or inside the cogeneration heat source and receives heat from the power generation unit. By circulating the water, the water in the hot water storage tank 70 is slowly heated and stored with the circulating water or heat medium.

  These external heat sources such as a solar heat source, a heat pump heat source, and a cogeneration heat source are simply illustrated as an external heat source 90 in FIG. The external heat source heat exchanger 91 in the external heat source 90 is a heat collecting plate in the case of a solar heat source, and is a heat exchanger that receives heat generated in a condenser in the case of a heat pump heat source. The case corresponds to a heat exchanger that receives heat from the power generation unit. The external heat source heat exchanger 91 is connected to an external heat source circulation forward pipe 93 that connects the lower part of the hot water storage tank 70 and an external heat source circulation return pipe 94 that connects the upper part of the hot water storage tank 70. A circulation circuit for returning from the hot water storage tank 70, the external heat source circulation forward pipe 93, the external heat source heat exchanger 91, and the external heat source circulation return pipe 94 to the hot water storage tank 70 is formed by using the external heat source circulation pump 92 provided in the middle of Has been.

  When the liquid passing through the external heat source heat exchanger 91 uses an antifreeze such as propylene glycol, a heat exchanger is provided in the hot water storage tank 70 to indirectly heat the hot water stored in the hot water storage tank 70. Take the way.

  In addition, in the hot water storage tank hot water supply system 1 with an auxiliary heat source, the control board 10 in addition to the hot water storage tank 70 storing hot water heated by the external heat source 90 and the auxiliary heat source 15 capable of appropriately responding to changes in the amount of hot water used. The internal circulation pump 30, the heat exchanger 60 for heating, the three-way valve 80, etc. are used for hot water supply, heating, hot water filling and reheating. The control board 10 has a CPU inside, and combustors 23 corresponding to detection signals of detection devices such as a temperature sensor and a water amount sensor provided in the hot water storage tank hot water supply system 1 with an auxiliary heat source according to preprogrammed contents. It controls the driving of devices that require power supply, such as the internal circulation pump 30 and the additional circulation pump 43. Outside the hot water storage tank hot water supply system 1 with an auxiliary heat source 1, a hot water faucet 4, a hot water heating apparatus 5 such as a hot water floor heater and a hot water type air conditioner, and a bathtub 6 are provided on the exterior of the hot water storage tank hot water supply system 1 with an auxiliary heat source. It is connected to the external pipe connection port via various external pipes.

  A remote controller 11 is provided outside the hot water storage tank hot water supply system 1 with an auxiliary heat source. The remote controller 11 communicates with the control board 10 of the hot water storage tank hot water supply system 1 with an auxiliary heat source by signals such as electricity or light by wire or wireless, so that the user can use the hot water storage tank hot water supply system 1 with an auxiliary heat source. It has a switch capable of setting various functions, and a display section for confirming the setting status and the operating status of the hot water storage tank hot water supply system 1 with an auxiliary heat source.

(Hot water storage tank)
The hot water storage tank 70 is selected on the assumption that the hot water storage tank 70 is slowly heated by the external heat source 90 and has a capacity capable of supplying a daily hot water supply amount at home. The hot water storage tank 70 has a generally cylindrical shape because of strength and manufacturing advantages. The hot water storage tank 70 has a water supply connection port at the bottom, and a tank water supply pipe 71 is connected to the water supply connection port. A decompression valve 78 is provided in the middle of the tank water supply pipe 71, and the depressurized tap water is supplied to the hot water storage tank 70. Further, a water supply amount sensor 79 is provided on the downstream side of the pressure reducing valve 78 in the middle of the tank water supply pipe 71, and when hot water stored from the hot water storage tank 70 is supplied to the outside, tap water is supplied. Is detected. Although not shown, a relief valve is provided at an appropriate location of the hot water storage tank 70 to relieve pressure when an excessive pressure is applied to the hot water storage tank 70. There is a hot water supply connection port at the upper part of the hot water storage tank 70, and a tank hot water supply pipe 72 is provided. The tank hot water supply pipe 72 is connected to a hot water supply heat exchange water supply pipe 21 and a bypass pipe 81 to be described later via a three-way valve 80. Yes.

(Auxiliary heat source machine)
The heat exchanger section of the auxiliary heat source unit 15 is a so-called single can two-channel heat system in which the heat receiving section of the hot water supply heat exchanger 20 and the heat receiving section of the additional heat exchanger 40 are simultaneously heated in series by the combustor 23. It is an exchanger. The heat exchanger 20 for hot water supply and the heat exchanger 40 for reheating are provided with metal fins such as copper or stainless steel around a metal pipe such as copper or stainless steel having good thermal conductivity to improve the heat exchange rate. It has been made to. It is also possible to increase the heat efficiency of the auxiliary heat source unit 15 by providing a heat exchanger for recovering latent heat on the exhaust side of the heat exchanger unit.

  The hot water supply heat exchanger 20 is connected to a hot water supply heat exchange water supply pipe 21 serving as an inlet of hot water to be passed and a hot water supply heat exchange hot water supply pipe 22 serving as an outlet. Further, the hot water supply heat exchange water supply pipe 21 has a water amount sensor 24 and a water supply temperature sensor 25 from the upstream side, and the hot water supply heat exchange hot water supply pipe 22 has a hot water supply temperature sensor that detects the water temperature after passing through the hot water supply heat exchanger 20. 27 is provided. Further, a can body temperature sensor 26 for detecting overheating of the hot water supply heat exchanger 20 and the reheating heat exchanger 40 is provided on the surface of the external metal part of the hot water supply heat exchanger 20. A recirculation circulation forward pipe 41 and a recirculation circulation return pipe 42 are connected to the reheating heat exchanger 40.

  The combustor 23 can generate a high calorific value of a gas fuel such as natural gas (LNG) or propane gas (LPG) or a liquid fuel such as kerosene or heavy oil in a relatively narrow combustion chamber by an air supply side blower. And a fuel control means capable of adjusting the calorific value steplessly within a predetermined range. The combustion heat generated by the combustion of the combustor 23 and the hot water passed through the flow path of the hot water supply heat exchanger 20 and the flow path of the reheating heat exchanger 40 are heat-exchanged and rapidly heated. The The combustor 23 may be a method of rapidly heating with an electric heater.

(Switching means)
As a switching means, a three-way valve 80 is provided at a portion where the tank hot water supply pipe 72 is connected to the hot water supply heat exchange water supply pipe 21 and the bypass pipe 81. The three-way valve 80 has a connection port C80c to which the tank hot water supply pipe 72 is connected, a connection port A80a to which the hot water supply heat exchange water supply pipe 21 is connected, and a connection port B80b to which a bypass pipe 81 that is a bypass flow path of the auxiliary heat source unit 15 is connected. And three connection ports 80a, 80b and 80c. The three-way valve 80 has electrical drive means, and the control board 10 controls the flow path connecting the tank hot water supply pipe 72 and the hot water supply heat exchange water supply pipe 21, the tank hot water supply pipe 72 and the bypass pipe 81. The flow path can be switched to a connected flow path. The end of the bypass pipe 81 opposite to the side connected to the three-way valve 80 is connected to the hot water supply / hot water supply pipe 22.

(Internal circulation circuit)
The hot water supply / hot water supply pipe 22 is provided with a branch portion of the internal circulation forward pipe 28 between a place where the hot water temperature sensor 27 is provided and a place where the bypass pipe 81 is connected. Further, a joining portion of an internal circulation return pipe 29 is provided in the middle of the hot water supply heat exchange water supply pipe 21. An internal circulation pump 30 is provided in the middle of the internal circulation return pipe 29, and the hot water supply heat exchanger 20, the hot water supply / hot water supply pipe 22, the internal circulation forward pipe 28, and the heating heat are provided using the internal circulation pump 30 as a circulation means. An internal circulation circuit is formed that returns from the exchanger 60, the internal circulation return pipe 29, and the hot water supply heat exchange water supply pipe 21 to the hot water supply heat exchanger 20.

(Bypass)
On the downstream side of the pressure reducing valve 78 of the tank water supply pipe 71, a branch portion of a bypass pipe 85 serving as a bypass of the hot water storage tank 70 is provided, and the end of the bypass pipe 85 opposite to the side connected to the tank water supply pipe 71. Is connected to a merging portion provided on the suction side of the internal circulation pump 30 of the internal circulation return pipe 29. An electric valve 86 is provided in the middle of the bypass pipe 85. The motor-operated valve 86 has an electric drive means, and can be switched between opening and closing of the flow path of the bypass circuit 85 under the control of the control board 10. The motor-operated valve 86 may be a flow rate adjusting valve capable of adjusting the flow rate of the flow path as well as opening and closing the flow path.

(Hot water supply mechanism)
In the above configuration of the hot water storage tank hot water supply system 1 with an auxiliary heat source 1, a hot water supply mechanism until the tap water is heated and supplied to the hot water faucet 4, particularly a plurality of hot water supply passages will be described. The basic hot water supply flow path of the hot water storage tank hot water supply system 1 with an auxiliary heat source is that the tap water decompressed by the pressure reducing valve 78 is a tank water supply pipe 71, a hot water storage tank 70, a tank hot water supply pipe 72, a three-way valve 80, and a hot water supply heat exchange water supply pipe. 21, a flow path to the hot water faucet 4 through the hot water supply heat exchanger 20 of the auxiliary heat source unit 15 and the hot water supply hot water supply pipe 22. The basic hot water supply channel is provided with a channel that is separated from the following three basic hot water supply channels. The first separation flow path branches from the hot water supply / hot water supply pipe 22 and returns to the internal circulation forward pipe 28, the heating heat exchanger 60, the internal circulation return pipe 29, and the hot water supply / heat exchange water supply pipe 21. It is. The second flow path to be separated is a bypass flow path that is branched by the three-way valve 80 of the tank hot water supply pipe 72 and connected to the hot water hot water supply hot water supply pipe 22 by the bypass pipe 81. The third flow path to be separated is a detour that branches at the tank water supply pipe 71 and connects to the internal circulation return pipe 29 via the detour pipe 85. The hot water supply / hot water supply pipe 22 is provided with a hot water mixing mechanism 39 in which a temperature sensor is incorporated, and the control board 10 is based on the measured value of the temperature sensor incorporated in the hot water mixing mechanism 39. The hot water supply temperature can be adjusted by mixing the tap water and the hot water by controlling 39. For this reason, the hot water mixing mechanism 39 is connected to a water supply branch pipe 38 branched from the tank water supply pipe 71.

(Memorial mechanism)
Explaining the chasing mechanism, the chasing circulation forward pipe 41 and the chasing circulation return pipe 42 are connected to the circulation fitting 7 provided in the bathtub 6 via an external pipe. A reheating temperature sensor 44 and a reheating water flow switch 45 are provided in the middle of the recirculation circulation return pipe 42, and a recirculation circulation pump 43 is provided in the middle of the recirculation circulation forward pipe 41. . As a result, the recirculation heat pump 40, the recirculation circulation pipe 41, the recirculation connection fitting 7, the bathtub 6, the recirculation connection fitting 7, and the recirculation circulation return pipe 42 are used again with the recirculation circulation pump 43 as a circulation means. A tracking circuit that returns to the tracking heat exchanger 40 is formed.

(Water filling mechanism)
Explaining the hot water filling mechanism, the hot water filling path 32 is branched on the downstream side of the hot water mixing mechanism 39 of the hot water supply heat exchange hot water supply pipe 22, and the circulation connecting fitting 7 and the additional temperature sensor 44 of the additional circulation return pipe 42. Are connected between. In the middle of the hot water filling path 32, a hot water filling valve 31, a hot water filling amount sensor 36 and a backflow prevention means 37 are provided.

(Heating mechanism)
The heating mechanism supplies hot water heated by the hot water supply heat exchanger 20 of the auxiliary heat source unit 15 to the hot water heating apparatus 5 through the heating heat exchanger 60 as a heat source. Since the hot water produced by the hot water supply heat exchanger 20 needs to be used in a sanitary manner by the hot water faucet 4, the hot water heating device 5 is heated via the heating heat exchanger 60. Two circulation circuits are connected to the heating heat exchanger 60 so as not to be mixed with warm water for heating, and heat exchange is performed between the two circulation circuits.

  One circulation circuit is the above-described internal circulation circuit, and the other circulation circuit heated by the internal circulation circuit uses the heating circulation pump 64 as a drive source and the heating heat exchanger 60 and the heating circulation forward pipe 61. , The hot water heating device 5, the heating circulation return pipe 62, and the heating circulation circuit that returns to the heating heat exchanger 60 again. The circulating fluid in the heating circuit may be simply water, but preferably a liquid obtained by adding a rust inhibitor to an antifreeze such as propylene glycol, which has a wide range of choices for installation location and components. The heating circulation forward pipe 61 is provided with a temperature sensor 65 for detecting the temperature of the circulating fluid.

  In the drawing, the heating circulation pump 64 is provided in the middle of the heating circulation return pipe 62, but may be provided on the heating circulation forward pipe 61 side. Moreover, the part provided in the exterior of the hot water storage tank hot water supply system 1 with an auxiliary heat source of the heating circulation forward pipe 61 and the heating circulation return pipe 62 is comprised by external piping. In the middle of the heating circulation circuit, expansion of the circulating fluid, that is, an expansion tank 66 for absorbing pressure rise, and a supply pipe for replenishing the circulating fluid are omitted for simplicity of illustration. Is provided.

  In these mechanisms of the hot water storage tank hot water supply system 1 with an auxiliary heat source 1, combustion is started by the blower of the combustor 23 and fuel control means, the amount of combustion is adjusted and combustion is stopped, the internal circulation pump 30, the hot water valve 31, and hot water mixing Driving of the mechanism 39, the recirculation circulation pump 43, the heating circulation pump 64, the three-way valve 80, and the like is controlled by the control board 10. The water amount sensor 24, the hot water amount sensor 36, and the feed water amount sensor 79 detect the flow rate that passes through, and the reheating water flow switch 45 detects that it has circulated, and the feed water temperature sensor 25, the can body temperature sensor 26, and the hot water temperature sensor 27. The reheating temperature sensor 44 and the tank temperature sensors 74 to 77 can detect the temperature of the passing liquid or the like. The detected flow rate, temperature, or the like is determined as a corresponding flow rate, temperature, or the like in the control board 10 by being input to the control board 10 as a signal such as a pulse or a voltage value.

(Heat storage operation of hot water storage tank)
A method for heating the water stored in the hot water storage tank 70 with the external heat source 90 will be described taking the case where the external heat source 90 is a cogeneration system as an example. The external heat source heat exchanger 91 and the hot water storage tank 70 form a circulation circuit with an external heat source circulation forward pipe 93 and an external heat source circulation return pipe 94 using an external heat source circulation pump 92 as a circulation means. The external heat source circulation pump 92 is driven to take out the water stored in the hot water storage tank 70 from the lower part of the hot water storage tank 70, heated by the external heat source heat exchanger 91, and then returned to the upper part of the hot water storage tank 70. The stored water inside the tank 70 is heated. Although the external heat source circulation pump 92 is provided in the middle of the external heat source circulation forward pipe 93, it may be provided in the middle of the external heat source circulation return pipe 94.

  Since the water temperature inside the hot water storage tank 70 varies depending on the height direction of the hot water storage tank 70, several tank temperature sensors 74, 75, 76, 77 are provided at different positions in the height direction of the hot water storage tank 70, and an external heat source The heat exchanger 91 is provided with an external heat source heat exchange temperature sensor 95 for detecting the circulating water temperature, and the temperature detected by these temperature sensors is output to the control board 10 by a signal such as a corresponding voltage.

  The control board 10 always detects the temperature of each part of the hot water storage tank 70 with the tank temperature sensors 74, 75, 76, 77 and the water temperature in the external heat source heat exchanger 91 with the external heat source heat exchange temperature sensor 95. When the water temperature in the external heat source heat exchanger 91 rises due to the start of power generation and the external heat source heat exchanger 91 can raise the temperature even when the water in the hot water storage tank 70 is circulated by the external heat source circulation pump 92, When the control board 10 determines that the temperature difference between the water temperature of the heat source heat exchanger 91 and the water temperature in the hot water storage tank 70 is equal to or greater than a predetermined temperature difference (for example, 5 deg), it is circulated by the external heat source circulation pump 92.

  Thereafter, when the control board 10 determines that the temperature difference between the water temperature in the external heat source heat exchanger 91 and the water temperature in the hot water storage tank 70 is less than a predetermined temperature difference (for example, 2 deg), the control board is connected to the external heat source circulation pump 92. 10 stops outputting drive power, and the external heat source circulation pump 92 stops. By continuing to drive the external heat source circulation pump 92, the water stored in the lower part of the hot water storage tank 70 is warmed and returned to the upper part of the hot water storage tank 70 in the hot water storage tank 70. Thereby, the hot water stored in the hot water storage tank 70 is heated in order from the upper part in the hot water storage tank 70, and the entire hot water stored in the hot water storage tank 70 is heated. And in the hot water storage tank 70, the hot water heated from the upper part of the hot water storage tank 70 is stored by the stratified hot water storage system toward the downward direction.

(Hot water operation)
The hot water supply operation will be described with reference to FIGS. The control board 10 constantly detects the temperature of the stored water in the upper part of the hot water storage tank 70 with the tank temperature sensor 74, and the temperature detected by the tank temperature sensor 74 is higher than the temperature set by the remote controller 11 (for example, 4 deg) or more. If it is higher, it is determined that the hot water supply operation is possible with the hot water in the hot water storage tank 70, and the connection port C80c and the connection port B80b of the three-way valve 80 are in communication with each other. When the external hot water faucet 4 is opened, the control board 10 determines that the hot water faucet 4 is being opened due to the signal from the feed water amount sensor 79 being open. The hot water storage tank 70 is supplied with a water supply pressure reduced by a pressure reducing valve 78, and the hot water in the hot water storage tank 70 heated by the heat storage operation by this water supply pressure is used for the hot water storage tank 70, the tank hot water supply pipe 72, and the bypass pipe. 81, the hot water faucet 4 is supplied to the hot water faucet 4 via the hot water supply hot water supply pipe 22 (see FIG. 2).

  If the temperature detected by the tank temperature sensor 74 is less than a predetermined temperature from the temperature set by the remote controller 11, the control board 10 determines that heating by the auxiliary heat source unit 15 is necessary, and The state is switched from the state in which the connection port C80c and the connection port B80b of the valve 80 communicate with each other to the state in which the connection port C80c and the connection port A80a communicate with each other. During a predetermined time for switching the three-way valve 80, the control board 10 opens the motor-operated valve 86 and supplies the depressurized tap water from the detour 85 to the internal circulation circuit (see FIG. 3). The predetermined time is a time required until the three-way valve 80 is switched, and is determined by measuring the switching time of the three-way valve 80 and adding a margin value to the actual measurement value. By supplying the tap water from the detour 85, the temporary water cut and the change in the amount of hot water in the hot water supply operation when the three-way valve 80 is switched are prevented. The motor-operated valve 86 is closed when the three-way valve 80 is switched.

  Thereafter, the hot water having a lowered temperature in the hot water storage tank 70 passes through the tank hot water supply pipe 72 and the hot water supply heat exchange water supply pipe 21, is heated by the auxiliary heat source unit 15, and then passes through the hot water supply heat exchange hot water supply pipe 22. It is supplied to the stopper 4 (see FIG. 4). Instead of detecting the temperature with the tank temperature sensor 74, a temperature sensor is provided in the tank hot water supply pipe 72 and the bypass pipe 81, and the switching timing of the three-way valve 80 can be determined based on the detected temperature.

  When hot water passes through the auxiliary heat source unit 15 during the hot water supply operation and the water amount sensor 24 detects the flow of hot water, the control board 10 outputs so as to drive the internal circulation pump 30. The hot water supply operation is stopped by determining that the control board 10 stops the hot water supply operation by detecting a decrease in the flow rate of hot water detected by the water supply amount sensor 79 that the hot water faucet 4 is closed. If the internal circulation pump 30 is driven, the internal circulation pump 30 is delayed by a predetermined time (about 5 minutes in the embodiment) after the auxiliary heat source unit 15 is stopped. Stop.

  As a specific example of the hot water supply operation, when the set temperature set by the user with the remote controller 11 is 60 ° C., the water temperature detected by the tank temperature sensor 74 is higher by 4 ° C. or more from the set temperature 60 ° C. In the case of 64 ° C. or higher, the control board 10 determines that the bypass pipe 81 is allowed to pass without passing through the auxiliary heat source unit 15. The hot water in the hot water storage tank 70 is supplied to the hot water mixing mechanism 39 as it is. A hot water mixing mechanism 39 is connected to a water supply branch pipe 38, and tap water is mixed with hot water so that the hot water mixing mechanism 39 reaches a set temperature, and hot water at 60 ° C. is supplied to the hot water faucet 4.

  Further, when the water temperature detected by the tank temperature sensor 74 is lower than the set temperature of 60 ° C. to 4 ° C. higher (less than 64 ° C.), the control board 10 is connected to the connection port C 80 c of the three-way valve 80. Assuming that the connection port A 80a is in communication, output is made so that the combustion of the combustor 23 of the auxiliary heat source device 15 is started, the set temperature of 60 ° C. is set as the target temperature of the combustor 23, and the hot water supply temperature sensor 27 The water temperature of the hot water supply pipe 22 is detected to adjust the combustion amount of the combustor 23 and the hot water mixing mechanism 39. If the hot water supply temperature is higher than the set temperature even if the minimum combustion amount of the combustor 23 is adjusted, tap water from the water supply branch pipe 38 is mixed by the hot water mixing mechanism 39 to a set temperature of 60 ° C. 4 is supplied.

(Hot water operation)
The operation of the hot water filling operation will be described. When the user inputs a hot water filling operation with the remote controller 11, the control board 10 controls the hot water filling valve 31 to open. The control board 10 constantly detects the temperature of the stored water in the upper part of the hot water storage tank 70 with the tank temperature sensor 74, and the temperature detected by the tank temperature sensor 74 is a predetermined temperature (for example, 4 deg) or more from the temperature set by the remote controller 11. If there is a temperature difference, it is determined that the hot water filling operation is possible with the hot water in the hot water storage tank 70, and the connection port C80c and the connection port B80b of the three-way valve 80 are in communication with each other. The hot water storage tank 70 is supplied with a water supply pressure reduced by a pressure reducing valve 78, and the hot water in the hot water storage tank 70 heated by the heat storage operation by this water supply pressure is used for the hot water storage tank 70, the tank hot water supply pipe 72, and the bypass pipe. 81, hot water is supplied to the hot water filling passage 32 through the hot water supply hot water supply pipe 22 and the hot water filling valve 31 (see FIG. 2, hot water is not supplied from the hot water faucet 4 in FIG. Stretched).

  If the temperature detected by the tank temperature sensor 74 is less than a predetermined temperature from the temperature set by the remote controller 11, the control board 10 determines that heating by the auxiliary heat source unit 15 is necessary, and The state is switched from the state in which the connection port C80c and the connection port B80b of the valve 80 communicate with each other to the state in which the connection port C80c and the connection port A80a communicate with each other. During a predetermined time for switching the three-way valve 80, the control board 10 opens the motor-operated valve 86 and supplies the depressurized tap water from the bypass 85 to the internal circulation circuit (see FIG. 3, hot water in FIG. 3). Hot water is applied to the bathtub 6 not from the stopper 4 but from the circulation fitting 7). The predetermined time is a time required until the three-way valve 80 is switched, and is determined by measuring the switching time of the three-way valve 80 and adding a margin value to the actual measurement value. By supplying tap water from the detour 85, a temporary water stop or a change in the amount of hot water during hot water filling operation when the three-way valve 80 is switched is prevented. The motor-operated valve 86 is closed when the three-way valve 80 is switched.

  The hot water whose temperature in the hot water storage tank 70 has decreased passes through the tank hot water supply pipe 72 and the hot water supply heat exchange water supply pipe 21 and is heated by the auxiliary heat source machine 15, and then via the hot water supply heat exchange hot water supply pipe 22. The hot water is supplied to the hot water filling passage 32 (see FIG. 4, but hot water is stretched to the bathtub 6 not from the hot water faucet 4 of FIG. 4 but from the circulation fitting 7). Instead of detecting the temperature with the tank temperature sensor 74, a temperature sensor is provided in the tank hot water supply pipe 72 and the bypass pipe 81, and the switching timing of the three-way valve 80 can be determined based on the detected temperature.

  When hot water passes through the auxiliary heat source unit 15 during hot water filling operation and the water amount sensor 24 detects the flow of hot water, the control board 10 outputs so as to drive the internal circulation pump 30. Further, when the hot water filling amount sensor 36 detects that the hot water filling operation is stopped, the control board 10 closes the hot water filling valve 31 and the feed water amount sensor 79 is filled with hot water. After confirming that the valve 31 is closed, the heating is stopped when the auxiliary heat source unit 15 is heating, and when the internal circulation pump 30 is driven, the auxiliary heat source unit 15 is stopped for a predetermined time ( The internal circulation pump 30 is stopped after a delay of about 5 minutes in the embodiment.

  As a specific example of the hot water filling operation, when the set temperature set by the user with the remote controller 11 is 42 ° C., the water temperature detected by the tank temperature sensor 74 is higher by 4 ° C. or more from the set temperature of 42 ° C. In the case (when the temperature is 46 ° C. or higher), the control board 10 determines to pass the bypass pipe 81 without passing the auxiliary heat source unit 15. The hot water in the hot water storage tank 70 is supplied to the hot water mixing mechanism 39 as it is. The hot water mixing mechanism 39 communicates with a water supply branch pipe 38, and tap water is mixed with hot water so that the set temperature is reached by the hot water mixing mechanism 39, and hot water of 42 ° C. mixed with tap water is filled with hot water. 32.

  Further, when the water temperature detected by the tank temperature sensor 74 is lower than the set temperature 42 ° C. to 4 ° C. higher (less than 46 ° C.), the control board 10 is connected to the connection port C80c of the three-way valve 80. The connection port A80a is communicated and output so as to start combustion of the combustor 23 of the auxiliary heat source unit 15. The set temperature of 42 ° C. is set as the target temperature of the combustor 23, and the hot water supply temperature sensor 27 is used to supply hot water and hot water. Is detected and the combustion amount of the combustor 23 and the hot water mixing mechanism 39 are adjusted. If the hot water temperature cannot be adjusted even if the control board 10 adjusts to the minimum combustion amount of the combustor 23, the hot water mixing mechanism 39 mixes the tap water from the feed water branch pipe 38 to a set temperature of 42 ° C. Supply to path 32.

(Heating operation)
The heating operation will be described with reference to FIG. When the user inputs heating with the remote controller 11, the control board 10 outputs and drives the heating circulation pump 64 and the internal circulation pump 30. The control board 10 detects the liquid temperature of the heating circuit with the heating temperature sensor 65 and the water temperature of the internal circuit with the hot water supply temperature sensor 27. When the detected water temperature of the hot water supply temperature sensor 27 is lower than a set temperature (for example, 75 ° C.) required during heating set in the control board 10, the control board 10 starts combustion of the combustor 23 and the hot water supply temperature. Combustion is continued while adjusting the combustion amount so that the sensor 27 reaches the set temperature. Although depending on the load of the hot water heater 5, if the load of the hot water heater 5 is less than the maximum heating load that is a value obtained by multiplying the maximum combustion amount of the combustor 23 by thermal efficiency, the liquid temperature circulating in the heating circulation circuit is When the temperature rises and the heating temperature sensor 65 detects a predetermined temperature (for example, 75 ° C.), the control board 10 reduces the combustion amount of the combustor 23 and burns if it exceeds the predetermined temperature even if the minimum combustion amount is exceeded. The internal circulation pump 30 and the heating circulation pump 64 are output so as to continue regardless of the stop of combustion.

  After that, when the heating temperature sensor 65 detects that the liquid temperature circulating in the heating circulation circuit is less than a predetermined temperature (for example, 65 ° C.), the control board 10 burns the combustor 23. When the user inputs the stop of heating with the remote controller 11, the control board 10 stops the combustion of the combustor 23, and after the elapse of a predetermined time (about 5 minutes in the embodiment), the internal circulation pump 30 and The driving of the heating circulation pump 64 is stopped and the heating operation is ended.

(Driving operation)
The operation of the bath chasing operation will be described. When the user inputs to bathe the bath with the remote controller 11, the control board 10 drives the chasing circulation pump 43. When the follow-up circulation pump 43 is driven and the follow-up water flow switch 45 is continuously turned on for a predetermined time (in the embodiment, 5 seconds), the control board 10 burns the combustor 23. And the combustion is continued up to the reheating temperature set by the remote controller 11 based on the temperature information of the reheating temperature sensor 44. If the follow-up water flow switch 45 is not turned ON continuously for a predetermined time (in the embodiment, 5 seconds), it is determined that there is no hot water in the bathtub 6 and combustion is not started, and an alarm is displayed on the remote controller 11. Go and stop driving.

(Principles of combined operation)
When there is a request to perform each operation in combination, the principle is to operate in combination. However, when the upper limit of the capacity of the combustor 23 is exceeded, that is, when the control board 10 determines that a desired temperature increase is not seen by the temperature sensors of each part, the reheating operation, hot watering operation, heating that can be stopped The operation is paused and resumed when there is a margin in the combustion capacity of the combustor 23.

(When hot water operation and heating operation are combined)
A case where the hot water supply operation and the heating operation are performed in combination will be described with reference to FIGS.
When the hot water supply operation is started during the heating operation (see FIG. 5), the control board 10 detects that the hot water faucet 4 has been opened by the water supply amount sensor 79, and the heating operation is continuing. Determine that it is necessary to start hot water operation. When the tank temperature sensor 74 is equal to or higher than the hot water supply set temperature of the remote controller 11, the bypass pipe 81 does not pass through the auxiliary heat source unit 15 that heats the hot water heating device 5 via the heating heat exchanger 60. Then, the hot water in the tank hot water supply pipe 72 is supplied to the upstream of the hot water mixing mechanism 39, adjusted to an appropriate temperature by the hot water mixing mechanism 39, and then supplied to the hot water faucet 4 (see FIG. 6). When the tank temperature sensor 74 is lower than the hot water supply set temperature of the remote controller 11, it passes through the auxiliary heat source unit 15 that heats the hot water heater 5 and is adjusted to an appropriate temperature by the hot water mixing mechanism 39 and then supplied to the hot water faucet 4. (See FIG. 8).

  When the heating operation is started during the hot water supply operation (see FIG. 2) when the tank temperature sensor 74 is higher than the predetermined hot water supply temperature of the remote controller 11 (see FIG. 2), the control board 10 causes the user to heat with the remote controller 11. When the input is detected, the heating temperature in the auxiliary heat source device 15 is changed to the heating temperature for heating, and the heating circulation pump 64 is driven to start the preparation so that the heating operation can be performed. Accordingly, the hot water in the tank hot water supply pipe 72 is supplied to the upstream of the hot water mixing mechanism 39 through the bypass pipe 81 without passing through the auxiliary heat source unit 15 heating the hot water heating apparatus 5 through the heating heat exchanger 60. Then, the temperature is adjusted to an appropriate temperature by the warm water mixing mechanism 39 and then supplied to the warm water faucet 4 (see FIG. 6).

  In the state where the hot water supply operation and the heating operation are performed simultaneously, in the case of the hot water supply operation using only the hot water storage tank 70, the temperature detected by the tank temperature sensor 74 does not differ from the temperature set by the remote controller 11 below the predetermined temperature. When the control board 10 detects that the hot water in the hot water storage tank 70 has run out, the connection port C80c and the connection port A80a from the state where the connection port C80c and the connection port B80b of the three-way valve 80 communicate with each other. Switch to the state where is communicating. During a predetermined time for switching the three-way valve 80, the control board 10 opens the motor-operated valve 86 and supplies depressurized tap water from the detour 85 to the internal circulation circuit (see FIG. 7). The predetermined time is a time required until the three-way valve 80 is switched, and is determined by measuring the switching time of the three-way valve 80 and adding a margin value to the measured value (for example, 5 seconds). . By supplying the tap water from the detour 85, the temporary water cut and the change in the amount of hot water in the hot water supply operation when the three-way valve 80 is switched are prevented.

  When the connection port C80c of the three-way valve 80 is switched to the state where the connection port A80a is in communication, the hot water whose temperature in the hot water storage tank 70 has decreased while the heating operation is continued is transferred to the tank hot water supply pipe 72 and the hot water supply heat exchange. After passing through the water supply pipe 21 and being heated by the auxiliary heat source unit 15, it is supplied to the hot water faucet 4 via the hot water supply heat exchange hot water supply pipe 22 (see FIG. 8).

(When additional hot water operation and heating operation are performed in combination)
In the case where the addition hot water operation and the heating operation are performed in combination, the content that the hot water faucet 4 is opened and closed in the hot water supply operation is merely replaced with the content that the hot water filling valve 31 is opened and closed. Since there is, explanation is omitted.

(Outline configuration)
The hot water storage tank hot water supply system 2 with an auxiliary heat source of Example 2 is demonstrated using FIG. In the hot water storage tank hot water supply system 2 with an auxiliary heat source, the reheating mechanism of the hot water storage tank hot water supply system 1 with the auxiliary heat source of the first embodiment is not the reheating heat exchanger 40 built in the auxiliary heat source 15, but the internal circulation of the internal circulation circuit. Branching is performed by the heating and recirculation switching valve 50 at the same location as the forward pipe 28, and the internal circulation return pipe 29a and the internal circulation return pipe 29a are connected to the internal circulation forward pipe 28a and the external heat exchanger 40a provided outside. 30 merged with the suction side. Therefore, since it is the structure similar to the hot water storage tank hot water supply system 1 with an auxiliary heat source, the same code | symbol is attached | subjected to the same element and description is abbreviate | omitted.

(Auxiliary heat source machine)
The heat exchanger part of the auxiliary heat source unit 15 a is a so-called one-can / one-channel heat exchanger in which the heat receiving part of the hot water supply heat exchanger 20 is heated by the combustor 23. The hot water supply heat exchanger 20 is provided with a metal fin such as copper or stainless steel around a metal pipe such as copper or stainless steel having good thermal conductivity to improve the heat exchange rate. An implementation method is also possible in which a heat exchanger for recovering latent heat is further provided on the exhaust side of the heat exchanger unit to increase the thermal efficiency of the auxiliary heat source unit 15a.

  The hot water supply heat exchanger 20 is connected to a hot water supply heat exchange water supply pipe 21 serving as an inlet of hot water to be passed and a hot water supply heat exchange hot water supply pipe 22 serving as an outlet. Further, the hot water supply heat exchange water supply pipe 21 has a water amount sensor 24 and a water supply temperature sensor 25 from the upstream side, and the hot water supply heat exchange hot water supply pipe 22 has a hot water supply temperature sensor that detects the water temperature after passing through the hot water supply heat exchanger 20. 27 is provided. A can body temperature sensor 26 for detecting overheating of the hot water supply heat exchanger 20 is provided on the surface of the external metal part of the hot water supply heat exchanger 20.

  The combustor 23 can generate a high calorific value of a gas fuel such as natural gas (LNG) or propane gas (LPG) or a liquid fuel such as kerosene or heavy oil in a relatively narrow combustion chamber by an air supply side blower. And a fuel control means capable of adjusting the calorific value steplessly within a predetermined range. Then, the hot water passed through the flow path of the hot water supply heat exchanger 20 is heat-exchanged and rapidly heated by the combustion heat generated by the combustion of the combustor 23. The combustor 23 can also be a method of rapid heating with an electric heater.

(Internal circulation circuit)
A bypass pipe 81 is connected between the hot water supply / hot water supply pipe 22 at a location where the hot water supply temperature sensor 27 is provided and the heating reheating switching valve 50. Is branched. Further, a branch portion of the internal circulation return pipe 29 is provided in the middle of the hot water supply heat exchange water supply pipe 21. An internal circulation pump 30 is provided in the middle of the internal circulation return pipe 29, and the hot water supply heat exchanger 20, the hot water supply / hot water supply pipe 22, the internal circulation forward pipe 28, and the heating heat are provided using the internal circulation pump 30 as a circulation means. An internal circulation circuit is formed that returns from the exchanger 60, the internal circulation return pipe 29, and the hot water supply heat exchange water supply pipe 21 to the hot water supply heat exchanger 20.

  Furthermore, the internal circulation return pipe 29a branches off from the heating recirculation switching valve 50, passes through the heat exchanger 40a for reheating, and is connected to the internal circulation pump 30 suction side of the internal circulation return pipe 29a. A second internal circulation circuit that joins the two is formed. When the heating additional switching valve 50 is switched under the control of the control board 10, either the internal circulation circuit or the second internal circulation circuit is selected.

(Memorial mechanism)
Explaining the reheating mechanism, the renewing mechanism replenishes hot water in the bathtub 6 using the hot water heated by the hot water supply heat exchanger 20 of the auxiliary heat source machine 15a through the reheating heat exchanger 40a as a heat source. It is. A recirculation circulation forward pipe 41 and a recirculation circulation return pipe 42 are connected to the reheating heat exchanger 40a, and this is also connected to a circulation connection fitting 7 provided in the bathtub 6 via an external pipe. . A reheating temperature sensor 44 and a reheating water flow switch 45 are provided in the middle of the recirculation circulation return pipe 42, and a recirculation circulation pump 43 is provided in the middle of the recirculation circulation forward pipe 41. . The reheating heat exchanger 40a is provided because the hot water produced by the hot water supply heat exchanger 20 needs to be used in a sanitary manner by the hot water faucet 4, and therefore via the reheating heat exchanger 40a. This is to make the hot water in the bathtub 6 recollect. For this reason, two circulation circuits are connected to the reheating heat exchanger 40a, and heat is exchanged between the two circulation circuits. One circulation circuit uses the internal circulation pump 30 as a drive source, the hot water supply heat exchanger 20, the hot water heat exchange hot water supply pipe 22, the heating reheating switching valve 50, the internal circulation forward pipe 28 a, the reheating heat exchanger 40 a, This is a second internal circulation circuit that returns to the circulation return pipe 29a, the internal circulation return pipe 29, the hot water supply heat exchange water supply pipe 21, and the hot water supply heat exchanger 20, and is on the other side that is heated by the second internal circulation circuit. The recirculation circuit includes a recirculation heat pump 40a, a recirculation circulation forward pipe 41, a recirculation connection fitting 7, a bathtub 6, a recirculation connection fitting 7, and a recirculation circulation return pipe 42 using the recirculation circulation pump 43 as a circulation means. The recirculation circuit returns to the reheating heat exchanger 40 again.

(Driving operation)
The operation of the bath chasing operation will be described. When the user inputs with the remote controller 11 to follow the bath, the control board 10 drives the internal circulation pump 30 and the follow-up circulation pump 43. When the follow-up circulation pump 43 is driven and the follow-up water flow switch 45 is continuously turned on for a predetermined time (in the embodiment, 5 seconds), the control board 10 burns the combustor 23. And the combustion is continued up to the reheating temperature set by the remote controller 11 based on the temperature information of the reheating temperature sensor 44. If the follow-up water flow switch 45 is not turned ON continuously for a predetermined time (in the embodiment, 5 seconds), it is determined that there is no hot water in the bathtub 6 and combustion is not started, and an alarm is displayed on the remote controller 11. Go and stop driving.

  Since the heat storage operation, the hot water supply operation, the hot water filling operation, the heating operation, the hot water supply operation and the heating operation of the hot water storage tank 70 are performed in combination, the description is omitted.

(When hot water operation and chasing operation are combined)
In the case where the hot water supply operation and the reheating operation are performed in combination, in the second embodiment, the reheating operation is performed using the second internal circulation circuit, so that the hot water supply operation and the heating operation of the first embodiment are combined. In the same manner as in the case where the hot water supply operation and the reheating operation are performed at the same time, the temperature detected by the tank temperature sensor 74 is different from the temperature set by the remote controller 11 by a predetermined temperature (for example, 4 deg) or more. For example, the state where the connection port C80c and the connection port A80a of the three-way valve 80 are communicated is switched to the state where the connection port C80c and the connection port B80b are communicated, and the auxiliary heat source unit 15a is not allowed to pass. Then, the temperature detected by the tank temperature sensor 74 is detected so as not to be less than a predetermined temperature from the temperature set by the remote controller 11, and the connection port C80c and the connection port B80b of the three-way valve 80 communicate with each other. When switching to a state where C80c and connection port A80a are in communication. The motor-operated valve 86 is opened for a predetermined time during which the three-way valve 80 is switched.

1, 2: Hot water storage tank hot water supply system with auxiliary heat source 4: Hot water faucet 5: Hot water heater 6: Bathtub 7: Circulation fitting 10: Control board 11: Remote control 15, 15a: Auxiliary heat source machine 20: Heat exchanger for hot water supply 21: Hot water supply hot water supply pipe 22: Hot water supply hot water supply pipe 23: Combustor 24: Water quantity sensor 25: Water supply temperature sensor 26: Can body temperature sensor 27: Hot water supply temperature sensor 28, 28a: Internal circulation forward pipes 29, 29a: Internal circulation return pipe 30: Internal circulation pump 31: Hot water filling valve 32: Hot water filling passage 35: Backflow prevention means 36: Hot water filling amount sensor 37: Backflow prevention means 38: Water supply branch pipe 39: Hot water mixing mechanism 40, 40a: Additional Burning heat exchanger 41: recirculation circulation forward pipe 42: recirculation circulation return pipe 43: recirculation circulation pump 44: reheating temperature sensor 45: reheating water flow switch 50: heating reheating switching valve 0: Heat exchanger for heating 61: Heating circulation outgoing pipe 62: Heating circulation return pipe 64: Heating circulation pump 65: Temperature sensor 70: Hot water storage tank 71: Tank water supply pipe 72: Tank hot water supply pipes 74, 75, 76, 77: Tank temperature sensor 78: Pressure reducing valve 79: Feed water amount sensor 80: Three-way valve (switching means)
81: bypass pipe 85: bypass pipe 86: motor operated valve 90: external heat source 91: external heat source heat exchanger 92: external heat source circulation pump 93: external heat source circulation forward pipe 94: external heat source circulation return pipe 95: external heat source heat exchange temperature sensor

Claims (2)

  A tank water supply pipe is arranged in the lower part and a tank hot water supply pipe is arranged in the upper part. The hot water storage tank that is slowly heated by an external heat source is connected to the downstream side of the tank hot water supply pipe, and hot water stored in the hot water storage tank is supplementarily heated. An auxiliary heat source device, an internal circulation circuit that branches on the outlet side of the auxiliary heat source device and returns between the tank hot water supply pipe and the inlet side of the auxiliary heat source device, and an internal circulation provided in the middle of the internal circulation circuit A pump, a bypass branching in the middle of the tank water supply pipe, and joining the suction side of the internal circulation pump; an electric valve provided in the middle of the bypass; and hot water stored in the hot water storage tank Hot water supply unit for supplying hot water from the outlet side of the heat source unit, and supplying the hot water for heating and / or replenishment through a heat exchanger by circulating the internal circulation pump using the auxiliary heat source unit as a heating source With hot water supply Bypass that bypasses the auxiliary heat source unit from the upstream side of the joining point of the internal circulation circuit on the inlet side of the auxiliary heat source unit and bypasses the downstream side of the branch point of the internal circulation circuit on the outlet side of the auxiliary heat source unit without passing the auxiliary heat source unit And a hot water storage tank hot water supply system with an auxiliary heat source provided with switching means for switching to the bypass flow path when the temperature of the hot water stored in the hot water storage tank is equal to or higher than a predetermined temperature.   During a predetermined time when the temperature of the hot water stored in the hot water storage tank becomes lower than a predetermined temperature and the switching means switches from the bypass flow path to the flow path passing through the auxiliary heat source machine, the motor-operated valve is opened to The hot water storage tank hot-water supply system with an auxiliary heat source according to claim 1, wherein the detour is in communication.

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