JP2013174390A - Solar hot water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar hot water supply system which can be easily constructed while reducing the cost of component members.SOLUTION: A solar hot water supply system 1 includes: a heat storage tank 3 of atomospheric release type for reserving a heat medium L heated at the solar heat collector 2; piping 4 for sending the heat medium, to send the heat medium L inside a solar heat collector 2 to the heat reservoir 3; piping 5 for returning the heat medium, to return the heat medium L in the heat reservoir 3 to the solar heat collector 2; a first electric three-way switching valve 71 for switching circulation passages of the heat medium L; a heat exchanger 6 having high temperature side piping 61 connected to the first electric three-way switching valve 71 and low temperature side piping 62 connected to a water supply pipe 11; a circulation pump 7 disposed at an upper stream of first electric three-way switching valve 71 in the piping 5 for returning the heat medium for circulating the heat medium L between the solar heat collector 2 or the high temperature side piping 61; and a controller 8 having a first control section 81 for controlling the first electric three-way switching valve 71 and a second control section 82 for controlling the circulation pump 7.

Description

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

2. Description of the Related Art Conventionally, from the viewpoint of energy saving, a solar heat-use hot water supply system that uses hot water to supply hot water is known (see, for example, Patent Document 1).
As shown in FIG. 4, this type of solar hot water supply system uses a solar heat collector 501 that heats a heat medium using solar heat, a hot water storage tank 503, a hot water storage tank 503, and a solar heat collector. A heat exchanger 505 that exchanges heat between the heat medium heated in 501 and the water in the hot water storage tank 503, a heat medium feed pipe 507 that sends the heat medium in the solar heat collector 501 to the heat exchanger 505, A circulation pump 511 that is provided in the middle of the heat medium return pipe 509 and circulates the heat medium between the solar heat collector 501 and the heat exchanger 505, and a hot water storage tank 503 and a circulation pump 511 in the heat medium return pipe 509 An expansion tank (systern) 513 provided between them and absorbing expansion / contraction of the heat medium, and a control device 515 for controlling the circulation pump 511 are provided.

  The hot water storage tank 503 has a water supply port connected to a water supply pipe 517 for supplying water from the water supply in the lower part, and a hot water outlet connected to a hot water discharge pipe 519 for discharging hot water. The hot water storage tank 503 is a sealed tank made of metal (for example, stainless steel) having excellent corrosion resistance, and has a heat insulating material on the outer peripheral portion. The hot water storage tank 503 is a vertical type whose height is larger than the installation width so that hot water can be easily gathered at the upper part having the outlet, and is supported by a solid leg.

In addition, a pressure reducing valve 525 and a drain valve 527 are disposed in a water supply pipe 517 that supplies water to the hot water storage tank 503. The pressure reducing valve 525 is a valve that adjusts the feed water pressure to the hot water storage tank 503 in order to keep the pressure in the hot water storage tank 503 constant.
A hot water heater (auxiliary heater) 531 that heats hot water discharged from the hot water storage tank 503 as necessary is connected to the hot water outlet pipe 519 through a temperature control valve 533. The temperature adjustment valve 533 is connected to a mixing water supply pipe 529 branched from a water supply pipe 517 downstream of the pressure reducing valve 525, and previously mixed hot water in the hot water storage tank 503 and cold water supplied from the water supply pipe 517 are used to supply hot water. Water enters the vessel 531. Between the temperature control valve 533 and the water heater 531, a switching valve 537 connected to the direct water supply pipe 535 branched from the water supply pipe 517 upstream of the pressure reducing valve 525 is disposed. By using this switching valve 537, it is possible to switch between the case where water is introduced into the water heater 531 from the hot water outlet pipe 519 and the case where the water is supplied directly from the water supply pipe 517.

  The control device 515 is provided in the hot water storage tank 503 and detects the temperature of the water in the hot water storage tank 503, and the heat that is provided in the vicinity of the solar heat collector 501 and detects the temperature of the heat medium. The medium temperature sensor 523 is connected. The control device 515 controls the operation and stop of the circulation pump 511 based on the temperature difference between the temperature of the water detected by the water temperature sensor 521 and the temperature of the heat medium detected by the heat medium temperature sensor 523. To do.

Japanese Patent Laid-Open No. 10-89776

However, in the conventional solar-powered hot water supply system as described above, the hot water storage tank 503 is of a vertical type, so that the legs that support the hot water storage tank 503 need to be rigid. Therefore, the hot water storage tank 503 has to be enforced on the concrete foundation, and there is a problem that the construction work is not easy and it is difficult to shorten the enforcement period.
In the conventional solar water heating system, in order to reduce the load on the hot water storage tank 503, which is a sealed tank, a pressure reducing valve 525 that adjusts the water supply pressure to the hot water storage tank 503, and an expansion that absorbs expansion and contraction of the heat medium. Expensive parts, such as the tank 513, were required, which caused an increase in cost.
Further, since the heat exchanger 505 is disposed in the hot water storage tank 503 that is a sealed tank, there are restrictions on the type of heat exchanger that can be used, and the heat exchange performance of a plate heat exchanger, a multi-tubular heat exchanger, or the like is limited. It was difficult to use a high heat exchanger.

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a solar hot water supply system that can reduce the cost of parts while improving the heat exchange performance and can be easily implemented.

The above object of the present invention is achieved by the following configuration.
(1) A solar heat collector that heats a heat medium using solar heat, an open-air heat storage tank that stores the heat medium heated by the solar heat collector, and heat in the solar heat collector A heat medium feed pipe for sending a medium to the heat storage tank; a heat medium return pipe for returning the heat medium in the heat storage tank to the solar heat collector; and the heat storage pipe provided in the middle of the heat medium return pipe. A first electric three-way switching valve for switching the circulation path of the heat medium in the tank, and a high-temperature side pipe having an inlet end connected to the first electric three-way switching valve and an outlet end connected to the heat medium feed pipe And a low temperature side pipe having an inlet end connected to the water supply pipe and an outlet end connected to the outlet pipe, and heat is generated between the heat medium in the high temperature side pipe and the water in the low temperature side pipe. A heat exchanger to be exchanged, and provided upstream of the first electric three-way selector valve in the heat medium return pipe, A circulation pump that circulates the heat medium between the solar heat collector or the high temperature side pipe, a first control unit that controls the first electric three-way switching valve, and a second control unit that controls the circulation pump; And a control device that controls a heat exchanging operation by the heat exchanger and a heat collecting operation by the solar heat collector.
According to the hot water supply system using solar heat configured as described in (1) above, since the heat medium heated by the solar heat collector is stored in the open air heat storage tank, the expansion tank absorbs expansion / contraction of the heat medium. Need not be provided between the heat storage tank and the circulation pump. Further, the water supplied from the water supply pipe is discharged from the hot water discharge pipe through the low temperature side pipe of the heat exchanger. Since the low temperature side piping of the heat exchanger has higher pressure resistance than the conventional hot water storage tank, it is not necessary to provide a pressure reducing valve for adjusting the feed water pressure to the heat exchanger in the feed water pipe. Further, by switching the first electric three-way switching valve, the heat medium in the heat storage tank can be circulated to the solar heat collector or the heat exchanger with only one circulation pump, and a plurality of expensive circulation pumps are provided. There is no need.
In addition, since the heat exchanger is not arranged in the heat storage tank, there is no restriction on the type of heat exchanger that can be used, and a heat exchanger with high heat exchange performance such as a plate heat exchanger or a multi-tube heat exchanger is used. be able to.
In addition, the heat storage tank in which the heat medium is stored does not need to be a vertical type in order to make it easy to gather hot water at the upper part having a hot water outlet like a conventional hot water storage tank filled with hot water. The heat storage tank can be a horizontal type whose height is smaller than the installation width. Moreover, since the heat storage tank does not require pressure resistance, the structure of the heat storage tank itself can be simplified, or the heat storage tank can be made of synthetic resin to reduce the weight. Therefore, it is possible to simplify the construction work by simplifying the legs of the heat storage tank and eliminating the concrete foundation to make it a simple foundation.

(2) In the solar water heating hot water supply system configured as described in (1) above, the heat medium feed pipe is connected to an upper part of the heat storage tank, and the heat medium return pipe is connected to a lower part of the heat storage tank. A solar hot water supply system characterized by that.
According to the solar water heating hot water supply system configured as described in (2) above, the heat medium having a temperature lower than that of the upper part collected in the lower part of the heat storage tank is returned to the solar heat collector by the heat medium return pipe. The heating medium can be efficiently heated.

(3) In the solar water heating hot water supply system configured as described in (1) above, the heat medium feed pipe is connected to a lower part of the heat storage tank, and the heat medium return pipe is connected to an upper part of the heat storage tank. A solar hot water supply system characterized by that.
According to the solar water heating system having the configuration of (3) above, the heat medium having a higher temperature than the lower part gathering at the upper part of the heat storage tank is supplied to the high temperature side pipe of the heat exchanger via the first electric three-way switching valve. Thus, the heat exchanger can efficiently exchange the heat of the heat medium to the water in the low temperature side pipe.

(4) A solar heat collector that heats the heat medium using solar heat, an open-air heat storage tank that stores the heat medium heated by the solar heat collector, and heat in the solar heat collector A heat medium feed pipe for sending the medium to the upper part of the heat storage tank, a heat medium return pipe for returning the lower heat medium in the heat storage tank to the solar heat collector, and provided in the middle of the heat medium return pipe A second electric three-way switching valve that switches the circulation path of the heat medium in the heat storage tank, and an upstream of the second electric three-way switching valve in the heat medium return pipe, and the heat medium of the heat storage tank A third electric three-way switching valve for switching the circulation path, a fourth electric three-way switching valve provided in the middle of the heat medium feed pipe, for switching the circulation path of the heat medium in the heat storage tank, and an inlet end of the first electric three-way switching valve 2 is connected to the electric three-way switching valve 2 and has an outlet end connected to the third electric three-way switching valve. A pipe and a low temperature side pipe having an inlet end connected to a water supply pipe and an outlet end connected to a hot water pipe, between the heat medium in the high temperature side pipe and the water in the low temperature side pipe. A heat exchanger for exchanging heat, and the second electric three-way switching valve and the third electric three-way switching valve in the heat medium return pipe, and the solar heat collecting heat medium in the heat storage tank A circulation pump that circulates between the heater and the high temperature side pipe, an inlet end connected to the fourth electric three-way switching valve, and an outlet end connected to the circulation pump and the third electric motor in the heat medium return pipe A bypass pipe connected between the three-way switching valve, a third control unit for controlling the second to fourth electric three-way switching valves, and a second control unit for controlling the circulation pump; Control for controlling the heat exchange operation by the exchanger and the heat collection operation by the solar heat collector. Solar hot water system characterized by comprising apparatus and, a.
According to the hot water supply system using solar heat having the configuration of (4) above, the heat medium heated by the solar heat collector is stored in the open air heat storage tank, so that the expansion tank absorbs expansion / contraction of the heat medium Need not be provided between the heat storage tank and the circulation pump. Further, the water supplied from the water supply pipe is discharged from the hot water discharge pipe through the low temperature side pipe of the heat exchanger. Since the low temperature side piping of the heat exchanger has higher pressure resistance than the conventional hot water storage tank, it is not necessary to provide a pressure reducing valve for adjusting the feed water pressure to the heat exchanger in the feed water pipe. Further, by switching the second to fourth electric three-way switching valves, the heat medium in the heat storage tank can be circulated to the solar heat collector or heat exchanger with only one circulation pump, and an expensive circulation pump There is no need to provide multiple.
Also, since the heat exchanger is not arranged in the heat storage tank, there is no restriction on the type of heat exchanger that can be used, and a heat exchanger with high heat exchange performance such as a plate heat exchanger or a multi-tube heat exchanger is used. be able to.
In addition, the heat storage tank in which the heat medium is stored does not need to be a vertical type in order to make it easy to gather hot water at the upper part having a hot water outlet like a conventional hot water storage tank filled with hot water. The heat storage tank can be a horizontal type whose height is smaller than the installation width. Moreover, since the heat storage tank does not require pressure resistance, the structure of the heat storage tank itself can be simplified, or the heat storage tank can be made of synthetic resin to reduce the weight. Therefore, it is possible to simplify the construction work by simplifying the legs of the heat storage tank and eliminating the concrete foundation to make it a simple foundation.
In addition, when circulating the heat medium in the heat storage tank to the solar heat collector, by switching the second to fourth electric three-way switching valves, the heat medium having a lower temperature than the upper part collected in the lower part of the heat storage tank Since it can return to a solar-heat collector by heat-medium return piping, a solar-heat collector can heat a heat medium efficiently. On the other hand, when circulating the heat medium in the heat storage tank to the heat exchanger, the second to fourth electric three-way switching valves are switched to bypass the heat medium having a higher temperature than the lower part gathered at the upper part of the heat storage tank Since it is supplied to the high temperature side pipe of the heat exchanger via the pipe, the heat exchanger can efficiently exchange heat from the heat medium to the water in the low temperature side pipe. Therefore, it is possible to circulate the heat medium in the heat storage tank to the solar heat collector or the heat exchanger, respectively, while improving both the heating efficiency of the solar heat collector and the heat exchange efficiency of the heat exchanger.

(5) The solar-heated hot water supply system having any one of the above-described (1) to (4), wherein the second control unit in the control device is provided in the heat storage tank and heat in the heat storage tank A first sensor that detects the temperature of the medium, and a second sensor that is disposed in the solar heat collector and detects the temperature of the heat medium, and the temperature of the heat medium detected by the first sensor; A solar hot water supply system characterized in that the operation and stop of the circulation pump are controlled based on the temperature difference from the temperature of the heat medium detected by the second sensor.
According to the solar water heating hot water supply system having the configuration (5), the temperature of the heat medium in the heat storage tank detected by the first sensor and the temperature of the heat medium near the solar heat collector detected by the second sensor. If the heat collection operation is started when the temperature difference is higher than or equal to the predetermined start temperature, it is possible to avoid energy-efficient economic heat collection operation, and a solar heat collector installed outdoors in winter It is possible to prevent a decrease in the temperature of the heat medium in the hot water storage tank due to the heat collecting operation when the temperature of the nearby heat medium is lower than the temperature of the heat medium in the hot water tank.

(6) In the solar water heating hot water supply system having any one of the above configurations (1) to (5), the hot water discharged from the outlet end of the low temperature side pipe is heated as necessary in the hot water pipe. An auxiliary heater is connected via a temperature control device, and the temperature control device is connected to a water supply pipe for mixing branched from the water supply pipe, and is heated in advance from the outlet end of the low temperature side pipe And the water supplied from the mixing water supply pipe are mixed and introduced into the auxiliary superheater.
According to the solar water heating system having the configuration of (6) above, the auxiliary superheater after the hot water discharged from the heat exchanger and the water supplied from the mixing water supply pipe are set to a predetermined temperature by the temperature control device. Therefore, the auxiliary superheater can stably supply hot water at the temperature set by the user regardless of the temperature change of the hot water discharged from the heat exchanger or the water supplied from the mixing water supply pipe. Can do.

  According to the solar-heat-use hot water supply system which concerns on this invention, while improving heat exchange performance, while reducing components cost, the solar-heat-use hot water supply system with easy implementation can be provided.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

It is a schematic block diagram of the solar-heating hot water supply system which concerns on 1st Embodiment of this invention. It is a schematic block diagram of the solar-heating hot water supply system which concerns on 2nd Embodiment of this invention. It is a schematic block diagram of the solar-powered hot-water supply system which concerns on 3rd Embodiment of this invention. It is a schematic block diagram of the conventional solar heat utilization hot water supply system.

Embodiments according to the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the solar-powered hot water supply system 1 according to the first embodiment is configured as a forced circulation type in which a heat medium L is forcedly circulated to exchange heat, and a solar heat collector 2 and an open air type Heat storage tank 3, heat medium feed pipe 4, heat medium return pipe 5, first electric three-way switching valve 71, heat exchanger 6, circulation pump 7, control device 8, water heater (auxiliary (Heating machine) 10 and a temperature control valve (temperature control device) 9.

  The solar heat collector 2 has, for example, a rectangular plate shape, and has a heat collector area of about 2 square meters, which is 2 m long (roof flow direction), 1 m wide (direction along the purlin), and 60 mm thick. The solar heat collector 2 has an internal flow path for circulating the heat medium L therein, and heats the heat medium L using solar heat. Generally, the internal flow path is installed on the roof surface in the direction of the longitudinal side, and a plurality of the internal flow paths are used side by side. In the present embodiment, three solar heat collectors 2 are connected and provided, and the heat medium L is heated using solar heat.

The heat storage tank 3 is a horizontal tank that is installed in a space under the eaves or the like and stores the heat medium L heated by the solar heat collector 2, and has a liquid storage capacity of about 200 liters.
The heat storage tank 3 of the present embodiment has a rectangular parallelepiped tank body 31 having an upper opening, and a lid 32 that covers the upper opening of the tank body 31, and is formed of a synthetic resin integrally formed with a heat insulating material. Yes.
The lid 32 covers the upper opening of the tank body 31 so that the heat medium L does not flow out of the tank body 31 and rainwater does not flow into the tank body 31. The tank body 31 is open to the atmosphere.

  The tank body 31 has an upper port (inlet) 33 connected to the heat medium feed pipe 4 in the upper part of the heat storage tank 3 and a lower port (outlet) connected to the heat medium return pipe 5 in the lower part of the heat storage tank 3. ) 35 and communicates with an internal flow path (not shown) of the solar heat collector 2. In addition, a drainage port (not shown) that is opened when the heat medium L is removed from the tank body 31 is provided in the lower part of the tank body 31. The heat medium L stored in the tank body 31 is heated by circulating between the solar heat collector 2 and becomes high temperature.

  One end of the heat medium feeding pipe 4 is connected to the inlet / outlet pipe 21 that is the drain side of the downstream solar heat collector 2, and the other end is connected to the upper port 33 of the tank body 31. One end of the heat medium return pipe 5 is connected to the lower port 35 of the tank body 31, and the other end is connected to the inlet / outlet pipe 23 that serves as the water injection side of the upstream solar heat collector 2.

  The first electric three-way switching valve 71 is provided in the middle of the heat medium return pipe 5 and switches the circulation path of the heat medium L in the heat storage tank 3 to the solar heat collector 2 or the heat exchanger 6. Specifically, in the first electric three-way switching valve 71, the valve body closes the passage from the heat medium return pipe 5 to the high temperature side pipe 61 and opens the passage from the heat storage tank 3 to the solar heat collector 2. Then, the valve body is switched to a state in which the passage from the heat storage tank 3 to the solar heat collector 2 is closed and the passage from the heat medium return pipe 5 to the high temperature side pipe 61 is opened.

  The heat exchanger 6 according to the first embodiment includes a high-temperature side pipe 61 having an inlet end connected to the first electric three-way switching valve 71 and an outlet end connected to the heat transfer pipe 4, and an inlet end A low-temperature side pipe 62 connected to the water supply pipe 11 and having an outlet end connected to the hot water pipe 13, and heat exchange between the heat medium L in the high-temperature side pipe 61 and the water in the low-temperature side pipe 62. This is a plate heat exchanger that is covered with a heat insulating material. The present invention is not limited to this. For example, various heat exchangers having high heat exchange performance such as a multi-tube heat exchanger can be used.

The high temperature side pipe 61 has an inlet end connected to the lower port 35 of the tank body 31 via the first electric three-way switching valve 71 and the heat medium return pipe 5 and an outlet end connected to the tank via the heat medium feed pipe 4. It is connected to the upper port 33 of the main body 31, and the heat medium L having a high temperature in the heat storage tank 3 is circulated by switching the first electric three-way switching valve 71.
The low temperature side pipe 62 has an inlet end connected to the water supply pipe 11 and an outlet end connected to the hot water discharge pipe 13, and a high temperature heat medium that circulates the water supplied from the water supply pipe 11 through the high temperature side pipe 61. Heat is exchanged with L, and the warmed water is discharged as hot water from the hot water discharge pipe 13.

The circulation pump 7 is provided upstream of the first electric three-way switching valve 71 in the heat medium return pipe 5 and pressurizes and conveys the heat medium L from the tank body 31, so that the heat medium L in the heat storage tank 3 is transferred. It circulates between the solar heat collector 2 or the high temperature side pipe 61.
In the present embodiment, an antifreeze liquid mainly composed of propylene glycol is used for the heat medium L from the viewpoint of safety. In addition, water can be used for the heating medium L when the circulating pump 7 is driven at all times or at a predetermined interval so that the heating medium L can be constantly circulated to prevent freezing.

The control device 8 includes a first control unit 81 that controls the first electric three-way switching valve 71 and a second control unit 82 that controls the circulation pump 7, and performs heat exchange operation and solar heat collection by the heat exchanger 6. The heat collection operation by the vessel 2 is controlled.
The first controller 81 is connected to the flow switch 20 provided in the water supply pipe 11 in the vicinity of the inlet end of the low temperature side pipe 62 and detecting the flow rate of water, and the first electric three-way switching valve 71. The first control unit 81 controls the valve switching of the first electric three-way switching valve 71 based on the flow rate of water detected by the flow switch 20. The flow switch 20 can use various flow meters as long as the flow of water in the water supply pipe 11 can be detected.

  The second control unit 82 is provided in the heat storage tank 3 to detect the temperature of the heat medium L in the heat storage tank 3 and the temperature of the heat medium L provided in the solar heat collector 2. Is connected to a second sensor 53 for detecting. Then, the second control unit 82 operates the circulation pump 7 based on the temperature difference between the temperature of the heat medium L detected by the first sensor 51 and the temperature of the heat medium L detected by the second sensor 53. Control the stop.

  In addition, if the 1st sensor 51 and the 2nd sensor 53 can detect the temperature of the heat carrier L in the heat storage tank 3 and the solar heat collector 2, respectively, in the heat storage tank 3 and the solar heat collector 2 respectively. Even if it is provided inside, the heat medium return pipe 5 near the heat storage tank 3 and the heat medium feed pipe 4 near the solar heat collector 2 may be provided.

  A hot water heater 10 that heats hot water discharged from the outlet end of the low temperature side pipe 62 in the heat exchanger 6 as necessary is connected to the hot water outlet pipe 13 of the heat exchanger 6 through a temperature control valve 9. A water supply pipe for mixing 41 branched from the water supply pipe 11 is connected to the temperature control valve 9, and the hot water discharged from the heat exchanger 6 and the water supplied from the water supply pipe for mixing 41 in advance have a predetermined temperature ( For example, the mixture is mixed so that the temperature becomes 30 ° C., and the water is supplied to the water heater 10. In addition, it can replace with the temperature control valve 9, and can also use the mixing unit which is a temperature control apparatus.

  A switching valve 43 connected to a direct water supply pipe 45 branched from the water supply pipe 11 is disposed between the temperature control valve 9 and the water heater 10. By using this switching valve 43, it is possible to switch between the case where the water entering the water heater 10 is performed from the temperature control valve 9 and the case where it is performed directly from the water supply pipe 11.

  When the hot water supply operation is performed, the hot water heater 10 is heated by igniting the hot water gas burner as necessary, and the hot water flowing from the temperature control valve 9 connected to the hot water discharge pipe 13 is subjected to heat exchange. Hot water having a predetermined hot water supply set temperature is supplied from a hot water supply pipe 47 to a hot water outlet terminal (not shown) such as a currant or a shower head.

Next, the effect | action of the solar-heating utilization hot water supply system 1 which concerns on 1st Embodiment which has the said structure is demonstrated.
In the solar hot water supply system 1 of the first embodiment, the first control unit 81 of the control device 8 performs the first electric operation when the flow rate of the water in the water supply pipe 11 detected by the flow switch 20 is zero. The valve body of the three-way switching valve 71 is switched to block the passage from the heat medium return pipe 5 to the high temperature side pipe 61, and the passage from the heat storage tank 3 to the solar heat collector 2 is opened. Therefore, when the circulation pump 7 is driven, the heat medium L in the heat storage tank 3 is returned to the solar heat collector 2 through the heat medium return pipe 5, and the solar heat collector 2 and the heat storage tank 3 are connected. Circulated between.

When solar radiation hits the solar heat collector 2, the heat medium L in the solar heat collector 2 is heated.
The second control unit 82 of the control device 8 detects the temperature of the heat medium L in the solar heat collector 2 detected by the second sensor 53 and the heat medium L in the heat storage tank 3 detected by the first sensor 51. When the temperature difference from the above temperature is equal to or higher than a predetermined start temperature, the heat collection operation program is started, the circulation pump 7 is operated by a power source such as a solar cell (not shown), and the heat collection operation is started.

  Therefore, the solar heat utilizing hot water supply system 1 can avoid the energy-efficient economic heat collecting operation, and the temperature of the heat medium L in the vicinity of the solar heat collector 2 installed outdoors in the winter season or the like. The temperature drop of the heat medium L in the heat storage tank 3 due to the heat collecting operation when the temperature is lower than the temperature of the heat medium L inside can be prevented.

When the heat collection operation is started, the circulation pump 7 rotates, and the heat medium L is forced to the heat medium return pipe 5, the solar heat collector 2, the heat medium feed pipe 4, the heat storage tank 3, and the circulation pump 7. And circulate. As a result, the heat medium L stored in the heat storage tank 3 is heated.
At this time, in the solar water heating system 1 of the first embodiment, the heat medium feed pipe 4 is connected to the upper port 33 provided at the upper part of the heat storage tank 3, and the heat medium return pipe 5 is the lower part of the heat storage tank 3. Is connected to the lower port 35 provided in Therefore, the solar heat collector 2 efficiently heats the heat medium L by returning the heat medium L having a temperature lower than the upper part collected in the lower part of the heat storage tank 3 to the solar heat collector 2 through the heat medium return pipe 5. be able to.
Then, when the temperature difference between the heat medium L in the solar heat collector 2 and the heat medium L in the heat storage tank 3 becomes less than a predetermined start temperature, the second control unit 82 stops the circulation pump 7, End heat collection operation.

  The selector valve 43 is switched so that the water supply to the hot water heater 10 is supplied from the hot water outlet pipe 13, and the hot water outlet terminal downstream of the hot water heater 10 is opened with the hot water supply operation of the solar hot water supply system 1 being performed. Then, the water supplied from the water supply pipe 11 flows into the temperature control valve 9 from the hot water discharge pipe 13 through the low temperature side pipe 62 of the heat exchanger 6 and is supplied to the water heater 10. At this time, the flow switch 20 detects the flow rate change (inflow) of the water in the water supply pipe 11.

  The first control unit 81 of the control device 8 switches the valve body of the first electric three-way switching valve 71 based on the inflow of water detected by the flow switch 20 from the heat storage tank 3 to the solar heat collector 2. The passage from the heat medium return pipe 5 to the high temperature side pipe 61 is opened. At this time, the heat medium L in the heat storage tank 3 becomes high temperature due to the heat collecting operation, and the temperature difference with the heat medium L in the solar heat collector 2 becomes less than a predetermined start temperature, so that the circulation pump 7 is stopped. If it is, the second control unit 82 of the control device 8 operates the circulation pump 7.

Therefore, the heat medium L having a high temperature in the heat storage tank 3 is circulated to the high temperature side pipe 61 of the heat exchanger 6.
The water supplied from the water supply pipe 11 to the low-temperature side pipe 62 of the heat exchanger 6 is heat-exchanged with the high-temperature heat medium L supplied to the high-temperature side pipe 61, and the hot water is heated. Take out the hot water at 13.

  The hot water flowing into the temperature control valve 9 is mixed with hot water discharged from the heat exchanger 6 and water supplied from the mixing water supply pipe 41 at a predetermined temperature (for example, 30 ° C.) and supplied to the water heater 10. Is done. The hot water heater 10 heats the hot water supplied from the temperature control valve 9 to a predetermined hot water supply set temperature as necessary and supplies the hot water to the outlet terminal from the hot water supply pipe 47.

  According to the hot water supply system 1 using solar heat of the first embodiment, the hot water discharged from the heat exchanger 6 and the water supplied from the mixing water supply pipe 41 are set to a predetermined temperature by the temperature control valve 9. Since water enters the water heater 10, the water heater 10 stabilizes the hot water at the temperature set by the user regardless of the temperature change of the hot water discharged from the heat exchanger 6 or the water supplied from the mixing water supply pipe 41. Hot water can be supplied.

  Therefore, in the solar-heat-use hot water supply system 1 described above, since the heat medium L heated by the solar heat collector 2 is stored in the open air heat storage tank 3, the expansion that absorbs the expansion / contraction of the heat medium L is achieved. There is no need to provide a tank between the heat storage tank 3 and the circulation pump 7.

The water supplied from the water supply pipe 11 is discharged from the hot water discharge pipe 13 through the low temperature side pipe 62 of the heat exchanger 6. Since the low temperature side pipe 62 of the heat exchanger 6 has higher pressure resistance than the conventional hot water tank 503 (see FIG. 4), it is necessary to provide a pressure reducing valve in the water supply pipe 11 for adjusting the water supply pressure to the heat exchanger 6. There is no.
Further, by switching the first electric three-way switching valve 71, the heat medium L in the heat storage tank 3 can be circulated to the solar heat collector 2 or the heat exchanger 6 with only one circulation pump 7, which is expensive. There is no need to provide a plurality of circulating pumps 7.

Further, since the heat exchanger 6 is not disposed in the heat storage tank 3, there is no restriction on the type of heat exchanger that can be used, and a heat exchanger having high heat exchange performance such as a plate heat exchanger or a multi-tube heat exchanger. Can be used.
Furthermore, the heat storage tank 3 in which the heat medium L is stored needs to be a vertical type in order to make it easy to collect high-temperature hot water at the upper part having the outlet, like the conventional hot water tank 503 filled with hot water. Since there is no, the heat storage tank 3 can be made into a horizontal installation type whose height is smaller than the installation width.

Moreover, since the heat storage tank 3 does not require pressure resistance, the structure of the heat storage tank 3 itself can be simplified, or the heat storage tank 3 can be reduced in weight by being formed of a synthetic resin as in this embodiment.
Furthermore, since the solar water heating system 1 has a horizontal cuboid shape whose height is smaller than the installation width of the heat storage tank 3, it is difficult for the heat storage tank 3 to fall down. The construction work can be facilitated by simplifying the section and eliminating the conventional concrete foundation to make it a simple foundation.
Moreover, height can be lowered by making the heat storage tank 3 horizontal, and the design can be improved so that the design of the house is not hindered.

  Therefore, according to the solar-heat-use hot water supply system 1 according to the first embodiment described above, the heat exchange performance is improved, the pressure reducing valve and the expensive expansion tank are not required, the parts cost is reduced, and the legs of the heat storage tank 3 are reduced. By simplifying the section and using it as a simple foundation, it is possible to facilitate the construction work, shorten the enforcement period, and significantly reduce costs.

FIG. 2 is a schematic configuration diagram of a solar water heating hot water supply system 101 according to the second embodiment of the present invention. In addition, about the structural member similar to the solar-heat utilization hot water supply system 1 which concerns on the said 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
As shown in FIG. 2, the solar water heating hot water supply system 101 according to the second embodiment includes a solar heat collector 2, an open air heat storage tank 3, a heat medium feed pipe 4, and a heat medium return pipe 5. A first electric three-way switching valve 71, a heat exchanger 6, a circulation pump 7, a control device 8, a hot water heater (auxiliary heater) 10, and a temperature control valve (temperature control device) 9. Prepare.

  In the solar water heating hot water supply system 101 according to the second embodiment, the heat medium feed pipe 4 is connected to a lower port (inlet) 35 provided at the lower part of the heat storage tank 3, and the heat medium return pipe 5 is a heat storage tank. 3 is connected to an upper port (outlet) 33 provided at the upper part of 3, and the inlet end of the high temperature side pipe 61 is connected to the upper port 33 of the tank body 31 via the first electric three-way switching valve 71 and the heat medium return pipe 5. It is the structure similar to the solar-heating hot water supply system 1 which concerns on the said 1st Embodiment except the outlet end being connected to the lower port 35 of the tank main body 31 via the heat-medium feed piping 4. FIG.

  According to the solar-powered hot water supply system 101 according to the second embodiment, the heat medium L that is hotter than the lower part that collects in the upper part of the heat storage tank 3 passes through the first electric three-way switching valve 71 and the high temperature of the heat exchanger 6. By being supplied to the side pipe 61, the heat exchanger 6 can efficiently exchange heat of the heat medium L to the water in the low temperature side pipe 62. In addition, the other effect is the same as that of the solar-heating hot water supply system 1 which concerns on the said 1st Embodiment.

FIG. 3 is a schematic configuration diagram of a solar hot water supply system 201 according to the third embodiment of the present invention. In addition, about the structural member similar to the solar-heat utilization hot water supply system 1 which concerns on the said 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
As shown in FIG. 3, a solar water heating hot water supply system 201 according to the third embodiment includes a solar heat collector 2, an open air heat storage tank 3, a heat medium feed pipe 4, and a heat medium return pipe 5. A second electric three-way switching valve 72, a third electric three-way switching valve 73, a fourth electric three-way switching valve 74, a heat exchanger 6, a circulation pump 7, a bypass pipe 75, and a control device. 8 a, a hot water heater (auxiliary heater) 10, and a temperature control valve (temperature control device) 9.

  The second electric three-way switching valve 72 is provided in the middle of the heat medium return pipe 5 and switches the circulation path of the heat medium L in the heat storage tank 3 to the solar heat collector 2 or the heat exchanger 6. Specifically, in the second electric three-way switching valve 72, the valve element closes the passage from the heat medium return pipe 5 to the high temperature side pipe 61, and the solar heat collector from the lower port (entrance / exit) 35 of the heat storage tank 3. A state where the passage to 2 is opened, a state where the valve body closes the passage from the lower port 35 of the heat storage tank 3 to the solar heat collector 2, and the passage from the heat medium return pipe 5 to the high temperature side pipe 61 is opened, Switch to.

  The third electric three-way switching valve 73 is provided upstream of the second electric three-way switching valve 72 in the heat medium return pipe 5, and the solar heat collector 2 or the heat is passed through the circulation path of the heat medium L in the heat storage tank 3. Switch to exchanger 6. Specifically, the third electric three-way switching valve 73 has a valve element that blocks the passage from the high-temperature side pipe 61 to the heat medium return pipe 5, and the second electric three-way switching valve from the lower port 35 of the heat storage tank 3. The state in which the passage to the solar heat collector 2 is opened through 72 and the valve block the passage from the lower port 35 of the heat storage tank 3 to the second electric three-way switching valve 72, and heat is stored from the high temperature side pipe 61. It switches to the state which opens the channel | path to the lower port 35 of the tank 3. FIG.

  The fourth electric three-way switching valve 74 is provided in the middle of the heat medium feed pipe 4 and switches the circulation path of the heat medium L in the heat storage tank 3 to the solar heat collector 2 or the heat exchanger 6. Specifically, the fourth electric three-way switching valve 74 has a valve element that blocks the passage from the heat medium feed pipe 4 to the bypass pipe 75, and the upper port (entrance / exit) 33 of the heat storage tank 3 from the solar heat collector 2. And the valve element closes the passage from the solar heat collector 2 to the upper port 33 of the heat storage tank 3, and the bypass pipe 75 and the second electric three-way switching from the upper port 33 of the heat storage tank 3 It switches to the state which opens the channel | path to the high temperature side piping 61 via the valve 72. FIG.

  The heat exchanger 6 according to the third embodiment includes a high temperature side pipe 61 having an inlet end connected to the second electric three-way switching valve 72 and an outlet end connected to the third electric three-way switching valve 73; A low-temperature side pipe 62 having an inlet end connected to the water supply pipe 11 and an outlet end connected to the hot water pipe 13, between the heat medium L in the high-temperature side pipe 61 and the water in the low-temperature side pipe 62. It is a plate type heat exchanger that exchanges heat with, and is covered with a heat insulating material.

The high temperature side pipe 61 has an inlet end connected to the upper port 33 of the tank body 31 via the second electric three-way switching valve 72, the heat medium return pipe 5, the bypass pipe 75 and the heat medium feed pipe 4 and an outlet end. Is connected to the lower port 35 of the tank body 31 via the third electric three-way switching valve 73 and the heat medium return pipe 5, and by switching the second to fourth electric three-way switching valves 72, 73, 74. The heat medium L having a high temperature in the heat storage tank 3 is circulated.
The low temperature side pipe 62 has an inlet end connected to the water supply pipe 11 and an outlet end connected to the hot water discharge pipe 13, and a high temperature heat medium that circulates the water supplied from the water supply pipe 11 through the high temperature side pipe 61. Heat is exchanged with L, and the warmed water is discharged as hot water from the hot water discharge pipe 13.

  The circulation pump 7 is provided between the second electric three-way switching valve 72 and the third electric three-way switching valve 73 in the heat medium return pipe 5 and conveys the heat medium L from the tank body 31 under pressure. The heat medium L in the heat storage tank 3 is circulated between the solar heat collector 2 or the high temperature side pipe 61.

The bypass pipe 75 has an inlet end connected to the fourth electric three-way switching valve 74 and an outlet end connected between the circulation pump 7 and the third electric three-way switching valve 73 in the heat medium return pipe 5.
The control device 8 a includes a third control unit 83 that controls the second to fourth electric three-way switching valves 72, 73, and 74 and a second control unit 82 that controls the circulation pump 7. The heat exchanging operation and the heat collecting operation by the solar heat collector 2 are controlled.

  The third control unit 83 is connected to the flow switch 20 and the second to fourth electric three-way switching valves 72, 73 and 74. The third control unit 83 controls valve switching of the second to fourth electric three-way switching valves 72, 73, 74 based on the flow rate of water detected by the flow switch 20.

Next, the effect | action of the solar-heat utilization hot water supply system 201 which concerns on 3rd Embodiment which has the said structure is demonstrated.
In the solar heat-use hot water supply system 201 of the third embodiment, the third control unit 83 of the control device 8a performs the second to second operations when the flow rate of water in the water supply pipe 11 detected by the flow switch 20 is zero. 4, the electric medium L in the heat storage tank 3 is circulated between the solar heat collector 2 and the heat storage tank 3.

  Specifically, the second electric three-way switching valve 72 blocks the passage from the heat medium return pipe 5 to the high temperature side pipe 61 and opens the passage from the lower port 35 of the heat storage tank 3 to the solar heat collector 2. The valve body is switched to the state. The third electric three-way switching valve 73 closes the passage from the high temperature side pipe 61 to the heat medium return pipe 5, and the solar heat collector from the lower port 35 of the heat storage tank 3 through the second electric three-way switching valve 72. The valve body is switched to a state where the passage to 2 is opened. The fourth electric three-way switching valve 74 closes the passage from the heat medium feed pipe 4 to the bypass pipe 75 and switches the valve body to a state in which the passage from the solar heat collector 2 to the upper port 33 of the heat storage tank 3 is opened. It is done.

  Therefore, when the circulation pump 7 is driven, the heat medium L in the heat storage tank 3 is returned to the solar heat collector 2 via the heat medium return pipe 5 and also the heat storage tank via the heat medium feed pipe 4. 3, the heat medium L is circulated between the solar heat collector 2 and the heat storage tank 3.

When solar radiation hits the solar heat collector 2, the heat medium L in the solar heat collector 2 is heated.
The second control unit 82 of the control device 8 a detects the temperature of the heat medium L in the solar heat collector 2 detected by the second sensor 53 and the heat medium L in the heat storage tank 3 detected by the first sensor 51. When the temperature difference from the above temperature is equal to or higher than a predetermined start temperature, the heat collection operation program is started, the circulation pump 7 is operated by a power source such as a solar cell (not shown), and the heat collection operation is started.

  Therefore, the solar heat-utilizing hot water supply system 201 can avoid the energy-efficient economic heat collection operation, and the temperature of the heat medium L in the vicinity of the solar heat collector 2 installed outdoors in the winter season or the like can be reduced. The temperature drop of the heat medium L in the heat storage tank 3 due to the heat collecting operation when the temperature is lower than the temperature of the heat medium L inside can be prevented.

When the heat collection operation is started, the circulation pump 7 rotates, and the heat medium L is forced to the heat medium return pipe 5, the solar heat collector 2, the heat medium feed pipe 4, the heat storage tank 3, and the circulation pump 7. And circulate. As a result, the heat medium L stored in the heat storage tank 3 is heated.
Then, when the temperature difference between the heat medium L in the solar heat collector 2 and the heat medium L in the heat storage tank 3 becomes less than a predetermined start temperature, the second control unit 82 stops the circulation pump 7, End heat collection operation.

  The switching valve 43 is switched so that the water supply to the hot water heater 10 is supplied from the hot water outlet pipe 13, and the hot water supply terminal downstream of the hot water heater 10 is opened with the hot water supply operation of the solar water heating hot water supply system 201 performed. Then, the water supplied from the water supply pipe 11 flows into the temperature control valve 9 from the hot water discharge pipe 13 through the low temperature side pipe 62 of the heat exchanger 6 and is supplied to the water heater 10. At this time, the flow switch 20 detects the flow rate change (inflow) of the water in the water supply pipe 11.

Based on the inflow of water detected by the flow switch 20, the third control unit 83 of the control device 8 a switches the second to fourth electric three-way switching valves 72, 73, 74, and stores in the heat storage tank 3. The heat medium L is circulated between the heat exchanger 6 and the heat storage tank 3.
Specifically, the second electric three-way switching valve 72 blocks the passage from the lower port 35 of the heat storage tank 3 to the solar heat collector 2 and opens the passage from the heat medium return pipe 5 to the high temperature side pipe 61. The valve body is switched to the state. The third electric three-way switching valve 73 closes the passage from the lower port 35 of the heat storage tank 3 to the second electric three-way switching valve 72, and the passage from the high temperature side pipe 61 to the lower port 35 of the heat storage tank 3. The valve body is switched to the open state. The fourth electric three-way switching valve 74 blocks the passage from the solar heat collector 2 to the upper port 33 of the heat storage tank 3, and bypasses the pipe 75 and the second electric three-way switching valve from the upper port 33 of the heat storage tank 3. The valve body is switched to a state where the passage to the high temperature side pipe 61 is opened via 72.

At this time, the heat medium L in the heat storage tank 3 becomes high temperature due to the heat collecting operation, and the temperature difference with the heat medium L in the solar heat collector 2 becomes less than a predetermined start temperature, so the circulation pump 7 is stopped. If it is, the second control unit 82 of the control device 8a operates the circulation pump 7.
Therefore, the heat medium L having a high temperature in the heat storage tank 3 is circulated to the high temperature side pipe 61 of the heat exchanger 6.
The water supplied from the water supply pipe 11 to the low-temperature side pipe 62 of the heat exchanger 6 is heat-exchanged with the high-temperature heat medium L supplied to the high-temperature side pipe 61, and the hot water is heated. Take out the hot water at 13.

  According to the solar heat utilization hot water supply system 201 according to the third embodiment, when the heat medium L in the heat storage tank 3 is circulated to the solar heat collector 2, the second to fourth electric three-way switching valves 72, By switching 73 and 74, the heat medium L having a temperature lower than that of the upper part collected in the lower part of the heat storage tank 3 can be returned to the solar heat collector 2 from the lower port 35 through the heat medium return pipe 5, so that the solar heat collector 2 can heat the heating medium L efficiently.

  On the other hand, when the heat medium L in the heat storage tank 3 is circulated to the heat exchanger 6, the second to fourth electric three-way switching valves 72, 73, and 74 are switched, so that Since the heat medium L that is hotter than the gathered lower part is supplied to the high temperature side pipe 61 of the heat exchanger 6 via the bypass pipe 75, the heat exchanger 6 efficiently converts the heat of the heat medium L to the water in the low temperature side pipe 62. It can exchange heat well.

  Therefore, the solar-powered hot-water supply system 201 according to the third embodiment uses the heating medium L of the heat storage tank 3 while simultaneously improving the heating efficiency of the solar heat collector 2 and the heat exchange efficiency of the heat exchanger 6. It can be circulated to the solar heat collector 2 or the heat exchanger 6. In addition, the other effect is the same as that of the solar-heating hot water supply system 1 which concerns on the said 1st Embodiment.

  In addition, the solar water utilization hot water supply system of this invention is not limited to each embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

For example, in the above embodiment, the circulation pump 7 is operated when the temperature difference between the heat medium L in the solar heat collector 2 and the heat medium L in the heat storage tank 3 is equal to or higher than a predetermined start temperature. Although it was configured, the solar pump can be configured to automatically operate the circulation pump when there is solar radiation.
Further, the heat collection operation method by the control device is not limited to the heat collection operation method of the control devices 8 and 8a described above. For example, a water supply temperature sensor, a water flow meter, a heat medium return provided in the water supply pipe 11 Circulation pump while calculating the amount of heat collected from the heat medium L in the heat storage tank 3 to the water in the heat exchanger 6 based on the values of the heat medium flow meter provided in the pipe 5 and the heat medium feed pipe 4 It goes without saying that various heat collecting operation methods such as controlling the number of rotations of 7 can be adopted.

DESCRIPTION OF SYMBOLS 1 ... Solar hot water supply system 2 ... Solar heat collector 3 ... Heat storage tank 4 ... Heat-medium feed piping 5 ... Heat-medium return piping 6 ... Heat exchanger 7 ... Circulation pump 8 ... Control device 9 ... Temperature control valve (temperature control) apparatus)
10 ... Water heater (auxiliary heater)
DESCRIPTION OF SYMBOLS 11 ... Supply pipe 13 ... Hot water pipe 20 ... Flow switch 31 ... Tank main body 32 ... Cover body 51 ... 1st sensor 53 ... 2nd sensor 61 ... High temperature side piping 62 ... Low temperature side piping 71 ... 1st electric three-way selector valve 81 ... 1st control part 82 ... 2nd control part L ... Heat medium

Claims (6)

A solar collector that uses solar heat to heat the heating medium;
An open air heat storage tank for storing a heat medium heated by the solar heat collector;
A heat medium feed pipe for sending the heat medium in the solar heat collector to the heat storage tank;
A heat medium return pipe for returning the heat medium in the heat storage tank to the solar heat collector;
A first electric three-way switching valve that is provided in the middle of the heat medium return pipe and switches a circulation path of the heat medium in the heat storage tank;
A high temperature side pipe having an inlet end connected to the first electric three-way switching valve and an outlet end connected to the heat transfer pipe, an inlet end connected to a water supply pipe, and an outlet end connected to a hot water pipe A heat exchanger that exchanges heat between the heat medium in the high temperature side pipe and the water in the low temperature side pipe,
A circulation pump that is provided upstream of the first electric three-way switching valve in the heat medium return pipe and circulates the heat medium in the heat storage tank between the solar heat collector or the high temperature side pipe;
A first control unit that controls the first electric three-way switching valve; and a second control unit that controls the circulation pump; and a heat exchange operation by the heat exchanger and a heat collection operation by the solar heat collector. A control device to control;
A hot water supply system using solar heat.   2. The solar-powered hot water supply system according to claim 1, wherein the heat medium feed pipe is connected to an upper part of the heat storage tank, and the heat medium return pipe is connected to a lower part of the heat storage tank.   2. The solar-powered hot water supply system according to claim 1, wherein the heat medium feed pipe is connected to a lower part of the heat storage tank, and the heat medium return pipe is connected to an upper part of the heat storage tank. A solar collector that uses solar heat to heat the heating medium;
An open air heat storage tank for storing a heat medium heated by the solar heat collector;
A heat medium feed pipe for sending the heat medium in the solar heat collector to the upper part of the heat storage tank;
A heat medium return pipe for returning a lower heat medium in the heat storage tank to the solar heat collector;
A second electric three-way switching valve provided in the middle of the heat medium return pipe for switching the heat medium circulation path of the heat storage tank;
A third electric three-way switching valve provided upstream of the second electric three-way switching valve in the heat medium return pipe and switching a circulation path of the heat medium in the heat storage tank;
A fourth electric three-way switching valve provided in the middle of the heat medium feed pipe and switching a heat medium circulation path of the heat storage tank;
A high-temperature side pipe having an inlet end connected to the second electric three-way switching valve and an outlet end connected to the third electric three-way switching valve; an inlet end connected to a water supply pipe; A low-temperature side pipe connected to the pipe, and a heat exchanger for exchanging heat between the heat medium in the high-temperature side pipe and the water in the low-temperature side pipe,
It is provided between the second electric three-way switching valve and the third electric three-way switching valve in the heat medium return pipe, and the heat medium in the heat storage tank is connected to the solar heat collector or the high temperature side pipe. A circulation pump that circulates between,
A bypass pipe having an inlet end connected to the fourth electric three-way switching valve and an outlet end connected between the circulation pump and the third electric three-way switching valve in the heat medium return pipe;
A third control unit for controlling the second to fourth electric three-way switching valves and a second control unit for controlling the circulation pump; and heat exchange operation by the heat exchanger and collection by the solar heat collector. A control device for controlling thermal operation;
A hot water supply system using solar heat.   The second control unit in the control device includes a first sensor that is provided in the heat storage tank and detects the temperature of the heat medium in the heat storage tank, and a temperature of the heat medium that is disposed in the solar heat collector. The circulating pump is operated based on a temperature difference between the temperature of the heat medium detected by the first sensor and the temperature of the heat medium detected by the second sensor. The solar hot water supply system according to any one of claims 1 to 4, wherein the stop is controlled.   An auxiliary heater for heating the hot water discharged from the outlet end of the low temperature side pipe as needed is connected to the hot water pipe via a temperature adjusting device, and the temperature adjusting device includes the water supply pipe A water supply pipe for mixing branched from is connected, and hot water discharged from the outlet end of the low temperature side pipe and water supplied from the water supply pipe for mixing are mixed and entered into the auxiliary superheater. The solar-heating-use hot water supply system according to any one of claims 1 to 5.

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