JP2016186411A - Solar heat utilization hot water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar heat utilization hot water supply system capable of reducing occurrence of hot water shortage in a case where large amount of hot water is used in a specific time band, without using a heat source machine having a function of heating heat medium.SOLUTION: A solar heat utilization hot water supply system 1 includes: a hot water supply facility 10; a solar heat collection unit 20; first to third two-way valves 32a-32c configured to supply any one of hot water stored in a hot water storage tank 22 of the solar heat collection unit 20 and cooling water from a service water pipe 50, to a hot water storage tank 12 of the hot water supply facility 10; and a heat exchange unit 30 configured to introduce hot water stored in the hot water storage tank 22 of the solar heat collection unit 20 and hot water stored in the hot water storage tank 12 of the hot water supply facility 10 to exchange heat therebetween, and to return hot water to the respective hot water storage tanks 12, 22.SELECTED DRAWING: Figure 1

Description

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

  Conventionally, a natural circulation water heater and a forced circulation solar system are known as solar heat utilizing devices. Moreover, the solar-heat-use hot water supply system which combined the solar-heat utilization apparatus and other heat-source equipment (heat pump, exhaust heat apparatus, etc.) is also proposed (for example, refer patent documents 1-3).

  Furthermore, in a solar heat utilization device that heats the heat medium using solar heat and heats the hot water in the hot water storage tank using the heated heat medium, the auxiliary heat medium can be heated by another heat source device, and the heat medium and the auxiliary A solar hot water supply system that can exchange heat with a heat medium has also been proposed (see, for example, Patent Document 4).

JP 2011-75250 A JP 2013-152036 A Japanese Patent Laying-Open No. 2015-4485 JP 2011-153718 A

  In recent years, a solar thermal solar system has been installed on the upstream side of an existing hot water supply system that has a heat source device such as a boiler and a hot water storage tank that stores hot water heated by the heat source device, and supplies hot water stored in the hot water storage tank to consumers. There has been considered a solar hot water supply system that connects (solar heat collection unit) and supplies hot water heated by the solar heat collection unit to a hot water storage tank of a hot water supply facility. According to this system, since the hot water heated by the solar heat collecting unit is supplied to the hot water storage tank of the hot water supply facility, the heating amount by the boiler or the like can be suppressed, and the fuel cost can be reduced.

  Here, the system as described above may be used in a nursing facility or the like. In nursing care facilities, there are things that are bathing care, and a large amount of hot water may be used in a specific time zone. In such a case, hot water could not be covered only by heating with a boiler or the like and supply of hot water from a solar heat collecting unit, causing hot water to run out.

  Therefore, the inventors of the present invention have, as a prior invention of Japanese Patent Application No. 2015-37661, a switching valve that supplies either hot water of a solar heat collecting unit or cold water from a water pipe to a hot water storage tank of a hot water supply facility. A solar hot water supply system is proposed.

  According to this hot water supply system using solar heat, for example, if the switching valve is operated to supply cold water from the water pipe to the hot water storage tank of the hot water supply equipment, hot water from the solar heat collection unit is supplied to the hot water supply equipment side. Heating can be continued without any problem, and a large amount of hot water can be secured in the solar heat collecting unit. After that, if the hot water stored in the solar heat collection unit is supplied to the hot water storage tank in the hot water storage unit by operating the switching valve again during the time when a large amount of hot water is used, the heating by the heat source equipment will not be in time, causing hot water to run out. The possibility of being lost can be reduced.

  However, even such a system still has the possibility of running out of hot water. That is, if cold water is supplied to the hot water storage tank of the hot water supply facility, the solar heat collecting unit can continue heating without supplying hot water to the hot water supply facility side. In such a case, the hot water cannot be sufficiently heated by the solar heat collecting unit, and as a result, the hot water may run out.

  On the other hand, for example, as described in Patent Document 4, it is conceivable that the auxiliary heat medium is heated by a heat source device to exchange heat with the heat medium in the solar heat collecting unit. There is. First, the solar heat-utilizing hot water supply system is often retrofitted with a solar heat collection unit upstream of existing hot water supply facilities. In general, a hot water supply facility has only a mechanism for heating hot water in a hot water tank. For this reason, when the auxiliary heat medium is heated by the heat source device, the heat source device of the existing hot water supply facility must be changed to a new heat source device (having a function of heating the auxiliary heat medium). Therefore, if the method of heating the auxiliary heat medium is adopted, it becomes impossible to use the heat source device of the existing hot water supply equipment.

  The present invention has been made to solve such a conventional problem, and the object of the present invention is not to use a heat source device having a function of heating a heat medium, and a specific time zone. An object of the present invention is to provide a solar hot water supply system that can further reduce the possibility of hot water shortage when a large amount of hot water is used.

  The solar-heat-use hot water supply system of this invention has a heat source machine and the 1st hot water tank which stores the hot water heated by the said heat source machine, and supplies the hot water stored in the said 1st hot water tank to a consumer A solar heat collecting unit having a hot water supply facility, a heat collecting unit for heating cold water using solar heat, and a second hot water storage tank for storing hot water heated by the heat collecting unit, and the solar heat collecting unit The hot water stored in the second hot water storage tank and the cold water from the water pipe are supplied to the first hot water tank of the hot water supply facility, and the second hot water tank of the solar heat collecting unit stores the changeover valve. And a heat exchange unit that introduces and exchanges heat with the hot water stored in the first hot water storage tank of the hot water supply facility and returns the heat to each hot water storage tank.

  According to the solar heat utilizing hot water supply system of the present invention, there is provided a switching valve that supplies either hot water stored in the second hot water storage tank of the solar heat collecting unit or cold water from the water pipe to the first hot water storage tank of the hot water supply facility. Therefore, for example, if cold water is supplied to the first hot water storage tank of the hot water supply facility, the solar heat collecting unit can continue heating without supplying hot water to the first hot water storage tank. Therefore, a relatively large amount of hot water can be secured. After that, for example, if hot water stored in the solar heat collecting unit is supplied to the first hot water storage tank of the hot water supply facility during a time period when a large amount of hot water is used, heating by the heat source device may not be in time, causing hot water shortage. Can be reduced.

  Here, if the cold water is supplied to the first hot water storage tank of the hot water supply facility, the solar heat collecting unit can continue heating without supplying hot water to the first hot water storage tank. When the amount of heat collection is insufficient, such as in rainy weather, the heat exchange unit is used to exchange heat, so that the amount of heat of the hot water on the first hot water tank side heated by the heat source unit is converted into the solar heat collection unit. It is possible to shift to hot water on the second hot water tank side. Therefore, even when the amount of heat collection is insufficient, such as rainy weather, a relatively large amount of hot water can be secured in the solar heat collection unit, further reducing the possibility of running out of hot water. can do.

  In addition, as described above, the heat exchange unit exchanges heat by introducing hot water stored in the second hot water storage tank of the solar heat collecting unit and hot water stored in the first hot water storage tank of the hot water supply facility. Therefore, it is not necessary to provide a heating mechanism for the heat medium in the heat source device itself.

  Therefore, it is not necessary to use a heat source device having a function of heating the heat medium, and the possibility of running out of hot water when a large amount of hot water is used in a specific time zone can be further reduced.

  Further, in the solar water heating system of the present invention, the switching valve includes a first switching valve provided on a first pipe for guiding cold water from a water pipe to a second hot water storage tank of the solar heat collection unit, and the solar heat collection. A second switching valve provided on a second pipe for guiding hot water from the second hot water storage tank of the heat unit to the first hot water storage tank of the hot water supply equipment, and cold water from the water pipe is guided to the first hot water storage tank of the hot water supply equipment. A third switching valve provided on the third pipe, wherein the heat exchange unit includes the first, second, and third pipes, and the first, second, and third switching valves. It is preferable.

  According to this solar heat utilization hot water supply system, the heat exchange unit has the first, second, and third pipes, and the first, second, and third switching valves. It is possible to switch between a state in which hot water in the second hot water storage tank of the solar heat collecting unit is supplied to the first hot water storage tank in the hot water supply facility and a state in which cold water from the water supply pipe is supplied to the first hot water storage tank in the hot water supply facility.

  Further, in the hot water supply system using solar heat of the present invention, the heat exchange unit is configured to open the first switching valve and the second switching valve, close the third switching valve, and perform no heat exchange. A first operating state, the third switching valve is in an open state, the first switching valve and the second switching valve are in a closed state, and no heat exchange is performed; 2 The hot water stored in the hot water tank and the hot water stored in the first hot water tank of the hot water supply facility are introduced to exchange heat, and the third operation state can be switched back to each hot water tank. Preferably there is.

  According to this solar heat utilization hot water supply system, since the heat exchange unit can switch between the first to third operation states, each operation state is switched by performing opening / closing control of a valve or the like in the heat exchange unit, It can be made to function as a control unit in operation state (a unit for forming a flow path or the like for realizing each operation state).

  Moreover, in the hot water supply system using solar heat according to the present invention, it is preferable that the heat exchange unit opens the third switching valve in the third operation state.

  According to this solar heat-utilizing hot water supply system, the heat exchange unit opens the third switching valve in the third operation state, so when there is hot water on the consumer side during the heat exchange, It is possible to prevent a situation where the hot water cannot be discharged.

  In the above, the switching valve is not limited to being automatically switched, and includes a valve that is manually switched.

  According to the present invention, there is no need to use a heat source device having a function of heating a heat medium, and the possibility of running out of hot water when a large amount of hot water is used in a specific time zone is further reduced. Can be provided.

It is a lineblock diagram showing the hot water system using solar heat concerning this embodiment. It is a figure which shows operation | movement of the solar-heating hot water supply system which concerns on this embodiment, Comprising: The flow of the hot water in the time slot | zone before a large amount of hot water is used is shown. It is a figure which shows operation | movement of the solar-heat-use hot water supply system which concerns on this embodiment, Comprising: The flow of the hot water in the time slot | zone when a large amount of hot water is used is shown. It is a figure which shows operation | movement of the solar-heating hot water supply system which concerns on this embodiment, Comprising: The flow of the hot water in the time slot | zone before a large amount of hot water is used is shown, and the case where heat exchange is performed is shown.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments described below, and can be changed as appropriate without departing from the spirit of the present invention. Moreover, in the following description, hot water is a concept including hot water and cold water of all temperatures. Furthermore, in the following description, hot water should have a temperature higher than that of cold water (cold water should have a temperature lower than that of hot water), and the temperature range of hot water and cold water is not limited. .

  FIG. 1 is a configuration diagram showing a solar hot water supply system 1 according to the present embodiment. As shown in FIG. 1, a solar heat utilization hot water supply system 1 according to this embodiment includes a hot water supply facility 10 and a solar heat collection unit 20, and the solar heat collection unit 20 is connected to the upstream side of the hot water supply facility 10. Such a solar thermal hot water supply system 1 is installed in a nursing facility such as a special nursing home for the elderly and a nursing home for the elderly.

  The hot water supply facility 10 includes a heat source unit 11, a hot water storage tank (first hot water storage tank) 12, pipes 13a to 13d, and first and second pumps 14a and 14b. The heat source device 11 is, for example, a boiler. The hot water storage tank 12 stores hot water heated by the heat source unit 11.

  The boiler piping 13 a is a piping for supplying hot water from the hot water storage tank 12 to the heat source device 11, and the boiler return piping 13 b is a piping for returning the hot water heated by the heat source device 11 to the hot water storage tank 12. The first pump 14a is provided on the boiler return pipe 13b. With this configuration, when the first pump 14a operates, the hot water circulates in the order of the boiler-bound pipe 13a, the heat source machine 11, the boiler return pipe 13b, and the hot water storage tank 12, and in this circulation process, the heat source machine 11 As a result, hot water is heated.

  The hot water supply pipe 13c is a pipe for supplying hot water from the hot water storage tank 12 to the consumer side (for example, a plurality of faucets for supplying hot water to the bathtub), and the hot water return pipe 13d is returned from the consumer side. It is a pipe for receiving hot and cold water. The second pump 14b is provided on the hot water supply pipe 13c. With this configuration, when the second pump 14b operates, hot water circulates in the order of the hot water supply pipe 13c, the consumer side, the hot water return pipe 13d, and the hot water storage tank 12.

  In addition, a plurality of faucets and the like are continuously provided in the pipe on the consumer side connecting the hot water supply pipe 13c and the hot water return pipe 13d, and hot water from the hot water storage tank 12 is operated regardless of which faucet or the like is operated. Is coming out.

  The solar heat collection unit 20 includes a heat collection unit 21 and a hot water storage tank (second hot water storage tank) 22 for storing hot water heated by the heat collection unit 21. The heat collection unit 21 heats cold water using solar heat and includes a heat collection panel 21a, a heat exchanger 21b, a circulation pipe 21c, and a third pump 21d. The heat collection panel 21a heats the heat medium using solar heat, and is installed at a position where it is easy to receive sunlight, for example, on a roof. The heat exchanger 21b is provided at the inner lower part of the hot water storage tank 22 and heats hot water by introducing a heat medium heated by the heat collecting panel 21a and exchanging heat with hot water at the lower part of the hot water storage tank 22. .

  The circulation pipe 21c is a pipe that circulates the heat medium between the heat collection panel 21a and the heat exchanger 21b. The third pump 21d is provided on the circulation pipe 21c and generates power for circulating the heat medium between the heat collection panel 21a and the heat exchanger 21b.

  Due to such a configuration, when the third pump 21d operates, the heat medium circulates between the heat collection panel 21a and the heat exchanger 21b through the circulation pipe 21c. That is, the heat medium is heated by the heat collecting panel 21a and is heat-exchanged with hot water by the heat exchanger 21b, so that the hot water in the hot water storage tank 22 is heated.

  Further, the solar heat collecting unit 20 includes a cold water introduction pipe 23 for introducing cold water from the water pipe 50 and an individual hot water discharge pipe 24 for discharging hot water in the hot water storage tank 22. Further, the hot water supply facility 10 includes an introduction pipe 13e for introducing hot water from the solar heat collecting unit 20 flowing through the individual hot water supply pipe 24, and a branch pipe 13f branched from the branch point A on the hot water supply return pipe 13d. It has more.

  Further, a heat exchange unit 30 is provided between the hot water supply facility 10 and the solar heat collection unit 20. The heat exchange unit 30 includes internal pipes 31a to 31e, two-way valves 32a to 32e, pumps 33a and 33b, and a heat exchanger 34. The heat exchange unit 30 includes first to fifth ports P1 to P5 for connecting the internal pipes 31a to 31e and the pipes 13e, 13f, 23, 24, and 50 outside the unit 30.

  Each port P1 to P5 is a part to be a connection port connected to each pipe 13e, 13f, 23, 24, 50, the first port P1 is connected to the water pipe 50, and the second port P2 is cold water introduction. It is connected to the pipe 23. The third port P3 is connected to the individual hot water supply pipe 24, and the fourth port P4 is connected to the introduction pipe 13e. Further, the fifth port P5 is connected to the branch pipe 13f.

  The first pipe 31 a is a pipe that connects the first port P <b> 1 and the second port P <b> 2, and is a pipe that guides cold water from the water pipe 50 to the hot water storage tank 22 of the solar heat collecting unit 20. The second pipe 31b is a pipe that connects the third port P3 and the fourth port P4, and is a pipe that guides hot water from the hot water storage tank 22 of the solar heat collecting unit 20 to the hot water storage tank 12 of the hot water supply facility 10. The third pipe 31 c is a pipe that connects the branch point B on the first pipe 31 a and the branch point C on the second pipe 31 b, and guides cold water from the water pipe 50 to the hot water storage tank 12 of the hot water supply facility 10. It is piping. The fourth pipe 31d has a branch point D on the second port P2 side from the branch point B in the first pipe 31a and a branch point E on the third port P3 side from the branch point C in the second pipe 31b. It is a pipe to be connected. The fifth pipe 31e is a pipe that connects the fifth port P5 and the branch point F between the branch points CE of the second pipe 31b.

  Such pipes 31a to 31e are provided with five two-way valves 32a to 32e. That is, the first two-way valve (switching valve, first switching valve) 32a is provided between the branch points BD in the first pipe 31a, and the second two-way valve (switching valve, second switching valve). 32b is provided between the branch points EF in the second pipe 31b. The third two-way valve (switching valve, third switching valve) 32c is provided on the third pipe 31c, the fourth two-way valve 32d is provided on the fourth pipe 31d, and the fifth two-way valve 32e is It is provided on the fifth pipe 31e.

  The pumps 33a and 33b serve as power sources for transferring hot water. Among these, the fourth pump 33a is provided between the branch point D and the fourth two-way valve 32d in the fourth pipe 31d, and the hot water on the branch point D side is moved to the fourth two-way valve 32d side. It generates power to be transferred. The fifth pump 33b is provided between the fifth port P5 and the fifth two-way valve 32e in the fifth pipe 31e, and transfers the hot water on the fifth port P5 side to the fifth branch point F side. It generates power.

  The heat exchanger 34 exchanges heat between the hot water flowing through the fourth pipe 31d and the hot water flowing through the fifth pipe 31e. The heat exchanger 34 has, for example, a first chamber connected to the fourth pipe 31d and a second chamber connected to the fifth pipe 31e, and performs heat exchange between these chambers. In the heat exchanger 34, the first chamber is located between the branch point D and the fourth pump 33a, and the second chamber is located between the fifth pump 33b and the fifth two-way valve 32e. ing.

  In the solar water heating system 1 as described above, either hot water stored in the hot water storage tank 22 of the solar heat collecting unit 20 or cold water from the water pipe 50 can be supplied to the hot water storage tank 12 of the hot water supply facility 10. it can. And the solar-heat-use hot water supply system 1 is using such two driving | running states, and is trying to reduce possibility that a hot water runout will generate | occur | produce. Of the two operating states, the operating state in which hot water stored in the hot water storage tank 22 of the solar heat collecting unit 20 is supplied to the hot water storage tank 12 of the hot water supply facility 10 is referred to as a first operating state. The operation state in which cold water is supplied to the hot water storage tank 12 of the hot water supply facility 10 is referred to as a second operation state.

  Hereinafter, operation | movement of the solar-heating hot water supply system 1 which concerns on this embodiment is demonstrated. FIG. 2 is a diagram showing the operation of the solar heat utilizing hot water supply system 1 according to this embodiment, and shows the flow of hot water in a time zone before a large amount of hot water is used. In addition, in FIG. 2, it has shown that the hot water is flowing into the piping part shown with a thick line, and has shown that the hot water does not flow into the piping part shown with a thin line.

  As shown in FIG. 2, the solar hot water supply system 1 is in the second operation state in a time zone before a large amount of hot water is used. That is, the third two-way valve 32c of the heat exchange unit 30 is opened, and the first and second two-way valves 32a and 32b are closed. At this time, the fourth and fifth two-way valves 32d and 32e are also closed, and the fourth and fifth pumps 33a and 33b are stopped.

  Thereby, hot water is not discharged from the individual hot water supply pipe 24 of the solar heat collection unit 20, and cold water of the water supply pipe 50 is not supplied to the hot water storage tank 22 of the solar heat collection unit 20.

  On the other hand, even in this state, heat collection is performed in the heat collection panel 21a, and the hot water in the hot water storage tank 22 is heated. Therefore, a relatively large amount of hot water is secured in the hot water tank 22.

  In this case, even if hot water is used on the demand side, the amount is enough to be covered by heating of the heat source unit 11 (amount that can be sufficiently covered by the amount of hot water in the hot water storage tank 12). Will not occur.

  FIG. 3 is a diagram showing the operation of the solar heat utilizing hot water supply system 1 according to the present embodiment, and shows the flow of hot water in a time zone in which a large amount of hot water is used. In addition, in FIG. 3, it has shown that the hot water is flowing into the piping part shown with a thick line, and has shown that the hot water does not flow into the piping part shown with a thin line.

  As shown in FIG. 3, the solar-powered hot water supply system 1 is in the first operation state in a time zone in which a large amount of hot water is used (for example, a time zone in which bathing care is performed from 9 am to 10 am). That is, the third two-way valve 32c of the heat exchange unit 30 is closed, and the first and second two-way valves 32a and 32b are opened. At this time, the fourth and fifth two-way valves 32d and 32e are also closed, and the fourth and fifth pumps 33a and 33b are stopped.

  In such a state, in a time zone when a large amount of hot water is used, a relatively large amount of hot water stored in the hot water storage tank 22 of the solar heat collecting unit 20 is supplied to the hot water storage tank 12. The Thereby, in the time zone when a large amount of hot water is used, a relatively large amount of hot water is supplied to the hot water storage tank 12 to reduce the possibility of running out of hot water.

  However, as shown in FIG. 3, even when the first operation state is entered in a time zone in which a large amount of hot water is used, sufficient heat can be collected if the weather is rainy or the like in the second operation state. However, since a relatively large amount of hot water having a high temperature cannot be secured in the hot water storage tank 12, the hot water may run out.

  Therefore, in the hot water supply system 1 using solar heat according to the present embodiment, hot water stored in the hot water storage tank 22 of the solar heat collection unit 20 and hot water stored in the hot water storage tank 12 of the hot water supply facility 10 are introduced and heated. A third operation state in which the hot water tanks 22 and the hot water storage tanks 12 are replaced and returned to each other is possible.

  FIG. 4 is a diagram showing the operation of the solar thermal hot water supply system 1 according to the present embodiment, showing the flow of hot water in a time zone before a large amount of hot water is used, and showing a case of performing heat exchange. Yes. In addition, in FIG. 4, it has shown that the hot water flows into the piping part shown with a thick line, and has shown that the hot water does not flow into the piping part shown with a thin line.

  As described above, in the time zone before a large amount of hot water is used (for example, the day before the day), the second operation state shown in FIG. The amount of heat to be secured is increased, but when the amount of collected heat becomes insufficient, the third operation state shown in FIG. 4 is set in a time zone before a large amount of hot water is used (for example, at night on the previous day).

  That is, as shown in FIG. 4, the first to third two-way valves 32a to 32c are closed, and the fourth and fifth two-way valves 32d and 32e are opened. Then, the fourth and fifth pumps 33a and 33b are set in an operating state. Further, the heat source device 11 is driven, and the hot water in the hot water storage tank 12 of the hot water supply facility 10 is heated.

  Here, when it becomes the above state, the hot water in the lower part of the hot water storage tank 22 of the solar heat collecting unit 20 reaches the second port P <b> 2 of the heat exchange unit 30 through the cold water introduction pipe 23. Then, the hot water reaches the fourth pipe 31d through the branch point D from the first pipe 31a and is introduced into the heat exchanger 34. Thereafter, the hot water reaches the second pipe 31b from the branch point E through the pump 33a and the fourth two-way valve 32d from the heat exchanger 34, and is returned to the upper part of the hot water tank 22 through the third port P3.

  The hot water in the upper part of the hot water storage tank 12 of the hot water supply facility 10 reaches the branch pipe 13f from the hot water return pipe 13d through the branch point A, and is introduced from the branch pipe 13f into the fifth pipe 31e through the fifth port P5 of the heat exchange unit 30. Is done. The hot water is introduced into the heat exchanger 34. Thereafter, the hot water reaches the second pipe 31b from the heat exchanger 34 through the fifth two-way valve 32e and the branch point F, and is returned to the lower part of the hot water storage tank 12 through the fourth port P4.

  In this way, the hot water in the lower part of the hot water tank 22 and the hot water in the upper part of the hot water tank 12 are introduced into the heat exchanger 34 to perform heat exchange, so that the amount of heat on the hot water tank 12 side is transferred to the hot water tank 22 side. Will be migrated.

  Thereby, even if it is a situation where a large amount of hot water is not stored in the hot water storage tank 22 due to the second operation state, a large amount of water is stored in the hot water storage tank 22 by setting the third operation state. Hot hot water can be stored and the possibility of running out of hot water can be further reduced.

  In FIG. 4 and FIG. 4, the third two-way valve 32c is described and illustrated as being in a closed state. However, in the third operation state, the third two-way valve 32c is preferably in an open state. Thereby, when heat exchange is performed, when there is hot water on the consumer side, it is possible to prevent a situation where hot water cannot be discharged.

  In this way, according to the solar heat utilizing hot water supply system 1 according to the present embodiment, any one of hot water stored in the hot water storage tank 22 of the solar heat collecting unit 20 and cold water from the water pipe 50 is supplied to the hot water supply facility 10. Since the two-way valves 32 a to 33 c that are supplied to the hot water storage tank 12 are provided, for example, if cold water is supplied to the hot water storage tank 12 of the hot water supply facility 10, the solar heat collecting unit 20 supplies hot water to the hot water storage tank 12. Heating can be continued without any problem, and a relatively large amount of hot water can be secured in the hot water tank 22. After that, for example, if hot water stored in the solar heat collecting unit 20 is supplied to the hot water storage tank 12 of the hot water supply facility 10 in a time zone in which a large amount of hot water is used, heating by the heat source device 11 will not be in time, causing hot water to run out. It is possible to reduce the possibility of being lost.

  Here, assuming that cold water is supplied to the hot water storage tank 12 of the hot water supply facility 10, the solar heat collecting unit 20 can continue heating without supplying hot water to the hot water storage tank 12, but even in this case, When the amount of collected heat is insufficient, such as in rainy weather, the heat exchange unit 30 is used to exchange heat, so that the amount of hot water on the hot water storage tank 12 side heated by the heat source unit 11 is converted to solar heat collection. The hot water can be transferred to the hot water storage tank 22 side of the unit 20. Therefore, even when the amount of heat collection is insufficient, such as rainy weather, a relatively large amount of high-temperature hot water can be secured in the solar heat collection unit 20, and the possibility of running out of hot water is further increased. Can be reduced.

  In addition, as described above, the heat exchange unit 30 introduces hot water stored in the hot water storage tank 22 of the solar heat collecting unit 20 and hot water stored in the hot water storage tank 12 of the hot water supply facility 10 to exchange heat. Therefore, it is not necessary to provide a heating mechanism for the heat medium in the heat source device 11 itself.

  Therefore, it is not necessary to use a heat source device having a function of heating the heat medium, and the possibility of running out of hot water when a large amount of hot water is used in a specific time zone can be further reduced.

  Moreover, since the heat exchange unit 30 includes the first, second, and third pipes 31a to 31c and the first, second, and third two-way valves 32a to 32c, the heat exchange unit 30 is used. Thus, it is possible to switch between a state in which the 22 hot water in the hot water storage tank of the solar heat collecting unit 20 is supplied to the hot water storage tank 12 in the hot water supply facility 10 and a state in which the cold water in the water pipe 50 is supplied to the hot water storage tank 12 in the hot water supply facility 10. .

  Further, since the heat exchange unit 30 can switch between the first to third operation states, each operation state is switched by performing opening / closing control of a valve or the like in the heat exchange unit 30, and the operation state control unit It can be made to function as (formation unit of a flow path etc. which realize each operation state).

  In addition, since the heat exchange unit 30 opens the third two-way valve 32c in the third operation state, when heat is exchanged, when there is hot water on the consumer side, the hot water cannot be discharged. Can be prevented.

  Furthermore, since the operation of the heat source unit 11 can be assisted using solar heat, the capacity of the heat source unit 11 can be reduced. In addition, since the possibility of running out of hot water can be reduced, it is possible to increase the number of customers such as day services in properties with a large amount of hot water supply such as special nursing homes for the elderly and nursing homes for the elderly.

  As described above, the present invention has been described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and modifications may be made without departing from the spirit of the present invention. You may combine the technique as described in a form.

  For example, in the above-described embodiment, the solar-powered hot water supply system 1 includes one solar heat collection unit 20 on the upstream side of the hot water supply facility 10, but is not limited thereto, and includes a plurality of solar heat collection units 20. May be. In this case, the heat exchange unit 30 may be provided for the number of the solar heat collecting units 20, or the pipes 23 and 24 of the plurality of solar heat collecting units 20 may be connected in the middle to form a plurality of solar heat collecting units. One heat exchange unit 30 may be provided for 20.

  Further, in the present embodiment, the solar heat collecting unit 20 is not limited to a system that circulates a heat medium, but may be a system that circulates hot water.

  In the present embodiment, there is one switching valve for supplying either hot water stored in the hot water storage tank 22 of the solar heat collecting unit 20 or cold water from the water pipe 50 to the hot water storage tank 12 of the hot water supply facility 10. A three-way valve or the like may be used. In addition to such a three-way valve, a heat exchange unit 30 having a heat exchanger 34 may be provided separately.

  Furthermore, in the present embodiment, the operation shown in FIG. 3 may be performed at all times without performing the operation shown in FIGS. 2 and 4 in a season in which hot water runs out, such as in winter. .

  In addition, in the present embodiment, the possibility of running out of hot water may be determined based on calendar information indicating dates of one year and the outside air temperature detected by the outside air temperature sensor. That is, from the calendar information, when the present time is from December to February, or when the outside air temperature is lower than the predetermined temperature, it is determined that it is winter and the operation shown in FIGS. 2 and 4 is performed. Also good.

1: Hot water supply system using solar heat 10: Hot water supply equipment 11: Heat source machine 12: Hot water storage tank (first hot water storage tank)
13a: Boiler piping 13b: Boiler return piping 13c: Hot water supply piping 13d: Hot water return piping 13e: Introducing piping 13f: Branch piping 14a, 14b: Pump 15: Hot water temperature sensor 20: Solar heat collecting unit 21: Heat collecting unit 21a : Heat collection panel 21b: Heat exchanger 21c: Circulation piping 21d: Pump 22: Hot water tank (second hot water tank)
23: Cold water introduction piping 24: Individual hot water piping 30: Heat exchange unit 31a: First piping 31b: Second piping 31c: Third piping 31d: Fourth piping 31e: Fifth piping 32a: First two-way valve (switching valve) , 1st switching valve)
32b: second two-way valve (switching valve, second switching valve)
32c: Third two-way valve (switching valve, third switching valve)
32d: 4th two-way valve 32e: Fifth two-way valve 33a, 33b: Pump 34: Heat exchanger 50: Water pipes P1-P5: First to fifth ports

Claims (4)

A hot water supply facility that has a heat source machine and a first hot water tank that stores hot water heated by the heat source machine, and that supplies hot water stored in the first hot water tank to consumers.
A solar heat collecting unit having a heat collecting unit for heating cold water using solar heat, and a second hot water storage tank for storing hot water heated by the heat collecting unit;
A switching valve for supplying either hot water stored in the second hot water storage tank of the solar heat collecting unit or cold water from the water pipe to the first hot water storage tank of the hot water supply facility;
A heat exchange unit that introduces hot water stored in the second hot water storage tank of the solar heat collecting unit and hot water stored in the first hot water storage tank of the hot water supply equipment, exchanges heat, and returns the hot water to each hot water storage tank When,
A hot water supply system using solar heat. The switching valve includes a first switching valve provided on a first pipe for guiding cold water from a water pipe to a second hot water storage tank of the solar heat collecting unit, and hot water from a second hot water tank of the solar heat collecting unit. A second switching valve provided on a second pipe leading to the first hot water storage tank of the hot water supply facility, and a third switching valve provided on a third pipe guiding cold water from the water pipe to the first hot water storage tank of the hot water supply equipment And consists of
The solar-powered hot water supply system according to claim 1, wherein the heat exchange unit includes the first, second, and third pipes, and the first, second, and third switching valves. The heat exchange unit is
A first operating state in which the first switching valve and the second switching valve are opened, the third switching valve is closed, and heat exchange is not performed;
A second operating state in which the third switching valve is opened, the first switching valve and the second switching valve are closed, and heat exchange is not performed;
Third operation in which hot water stored in the second hot water storage tank of the solar heat collecting unit and hot water stored in the first hot water storage tank of the hot water supply facility are introduced to exchange heat and returned to each hot water storage tank The hot water supply system using solar heat according to claim 2, wherein the state can be switched. The solar heat-use hot water supply system according to claim 3, wherein the heat exchange unit opens the third switching valve in the third operation state.

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