JP6427052B2 - Solar water heating system - Google Patents

Description

  The present invention relates to a solar water heating system.

  Conventionally, natural circulation type water heaters and forced circulation type solar systems are known as solar thermal devices. In addition, a solar heat utilization hot water supply system in which a solar heat utilization device and another heat source machine (a heat pump, a heat exhaust device, etc.) are combined is also proposed (for example, see Patent Documents 1 to 3).

  Furthermore, in a solar heat utilization apparatus that heats the heat medium using solar heat and heats the hot and cold water in the hot water storage tank with the heated heat medium, the auxiliary heat medium can be heated by another heat source unit, and the above heat medium and auxiliary There is also proposed a solar-heated hot-water supply system capable of exchanging heat with a heat medium (see, for example, Patent Document 4).

JP 2011-75250 A JP, 2013-152036, A JP, 2015-4485, A JP, 2011-153718, A

  Recently, a solar thermal solar system upstream of an existing hot water supply facility which has a heat source machine such as a boiler and a hot water storage tank for storing hot water heated by the heat source machine and supplies hot water stored in the hot water storage tank to consumers. A solar heat utilization hot water supply system is considered which is connected to a (solar heat collection unit) and supplies hot and cold 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 and cold water heated by the solar heat collecting unit is supplied to the hot water storage tank of the hot water supply facility, the amount of heating 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 home or the like. In nursing homes and the like, there are bathing and nursing care, and a large amount of hot water may be used in a specific time zone. In such a case, the heating by the boiler or the like and the supply of hot and cold water from the solar heat collecting unit can not supply the hot water, which may cause the running out of the hot water.

  Therefore, the inventors of the present invention have a switching valve for supplying either the hot water of the solar heat collecting unit or the cold water from the water pipe to the storage tank of the hot water supply facility as the prior application invention of Japanese Patent Application No. 2015-37661. Proposed a solar-heated hot water supply system.

  According to this solar heat utilization hot water supply system, for example, if the switching valve is operated to supply the cold water from the water pipe to the hot water storage tank of the hot water supply facility, the hot water from the solar heat collecting unit is supplied to the hot water supply facility The heating can be continued without heating, and a large amount of hot water can be secured in the solar heat collecting unit. After that, when the switching valve is operated again during a large amount of hot water use time to supply hot water stored in the solar heat collecting unit to the hot water storage tank of the hot water supply facility, heating by the heat source machine can not be made in time, It is possible to reduce the possibility of

  However, even such a system still has the possibility of running out of water. That is, if cold water is supplied to the hot water storage tank of the hot water supply facility, heating can be continued without supplying hot water to the hot water supply facility side in the solar heat collecting unit, but such is the case when the weather is rain etc. In such a case, the hot water can not be sufficiently heated by the solar heat collecting unit, and as a result, the hot water may be caused.

  On the other hand, for example, as described in Patent Document 4, it is conceivable to heat the auxiliary heat medium with a heat source unit to exchange heat with the heat medium in the solar heat collecting unit, but in this case the following problems There is. First, the above-described solar heat utilization hot water supply system is often retrofitted with a solar heat collection unit upstream of the existing hot water supply equipment. Generally, a hot water supply system is provided only with a mechanism for heating hot and cold water in a hot water storage tank. Therefore, when heating the auxiliary heat medium by the heat source machine, it is necessary to change the heat source machine of the existing hot water supply equipment to a new heat source machine (having a function of heating the auxiliary heat medium). Therefore, if the method of heating the auxiliary heat medium is adopted, the heat source unit of the existing hot water supply facility can not be used.

  The present invention has been made to solve such conventional problems, and the object of the present invention is to eliminate the need to use a heat source machine having a function of heating a heat medium, and to use a specific time zone. It is an object of the present invention to provide a solar heating hot water supply system capable of further reducing the possibility of hot water breakage when a large amount of hot water is used.

  The solar heat utilization hot-water supply system of the present invention has a heat source unit and a first storage tank for storing hot and cold water heated by the heat source unit, and supplies the consumer with the hot and cold water stored in the first storage tank. A solar heat collecting unit comprising a hot water supply facility, a heat collecting unit for heating cold water using solar heat, and a second water storage tank for storing hot water heated by the heat collecting unit, and the solar heat collecting unit The switching valve for supplying either the hot water stored in the second storage tank or the cold water from the water pipe to the first storage tank of the hot water supply facility, and the second storage tank of the solar heat collecting unit And a heat exchange unit for introducing and heat exchanging hot water and hot water stored in the first hot water storage tank of the hot water supply facility and returning the hot water to the respective hot water storage tanks.

  According to the solar heat utilization hot water supply system of the present invention, the switching valve for supplying either the hot water stored in the second water storage tank of the solar heat collection unit or the cold water from the water pipe to the first water storage tank of the hot water supply facility For example, if cold water is supplied to the first storage tank of the hot water supply facility, the solar heat collecting unit can continue heating without supplying hot water to the first storage tank, for example. A relatively large amount of hot water can be secured in the 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 large amount of hot water use time, heating by the heat source unit may not be in time, Can be reduced.

  Here, if cold water is supplied to the first storage tank of the hot water supply facility, the solar heat collecting unit can continue heating without supplying hot water to the first storage tank, but even in this case When the heat collection amount such as rainy weather is insufficient, the heat exchange unit is used to exchange heat, so that the heat quantity of the high temperature hot water of the first water storage tank side heated by the heat source machine is the solar heat collection unit It can be made to shift to the hot water of the 2nd hot water storage tank side. Therefore, even when the amount of heat collection is insufficient such as in the rain, a relatively large amount of high-temperature water can be secured in the solar heat collecting unit, and the possibility of causing a water shortage is further reduced. can do.

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

  Therefore, it is not necessary to use a heat source machine having a function of heating the heat medium, and it is possible to further reduce the possibility of water breakage when a large amount of hot water is used in a specific time zone.

  Further, in the solar heat utilization hot water supply system of the present invention, the switching valve is a first switching valve provided on a first pipe for guiding cold water from a water pipe to a second water storage tank of the solar heat collecting unit; A second switching valve provided on a second pipe for guiding hot water from a second water storage tank of the thermal unit to the first water storage tank of the hot water supply facility, and for guiding cold water from a water pipe to the first water storage tank of the hot water supply facility And a third switching valve provided on a third pipe, wherein the heat exchange unit has the first, second and third pipes and the first, second and third switching valves. Is preferred.

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

  In the solar heat utilization hot-water supply system according to the present invention, the heat exchange unit opens the first switching valve and the second switching valve, closes the third switching valve, and does not perform heat exchange. 1 operation state, the third switching valve is opened, the first switching valve and the second switching valve are closed, and the second operation state in which heat exchange is not performed, and the second solar heat collecting unit (2) It is possible to switch between the third operating state in which the hot water stored in the hot water storage tank and the hot water stored in the first hot water storage tank of the hot water supply facility are introduced and heat exchanged and returned to the respective hot water storage tanks Is preferred.

  According to this solar heat utilization hot water supply system, since the heat exchange unit can switch the first to third operation states, each operation state can be 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 of an operating state (a forming unit such as a flow path for realizing each operating state).

  Further, in the solar heat utilization hot water supply system of the present invention, it is preferable that the heat exchange unit open the third switching valve in the third operation state.

  According to this solar heat utilization hot-water supply system, the heat exchange unit opens the third switching valve in the third operation state, so when the heat exchange is performed, there is a hot water on the customer side, It is possible to prevent a situation where the hot water can not be tapped.

  In the above description, the switching valve is not limited to one automatically switched, but includes one switched manually.

  According to the present invention, it is not necessary to use a heat source machine having a function of heating a heat medium, and to further reduce the possibility of water breakage when a large amount of hot water is used in a specific time zone. Can provide a solar-powered hot water supply system.

It is a block diagram which shows the solar-heat utilization hot-water supply system which concerns on this embodiment. It is a figure which shows the operation | movement of the solar thermal hot water supply system which concerns on this embodiment, Comprising: The flow of the hot and cold water in the time zone before a lot of hot water is used is shown. It is a figure which shows the operation | movement of the solar thermal hot water supply system which concerns on this embodiment, Comprising: The flow of the hot and cold water in the time zone in which a large amount of warm water is used is shown. It is a figure which shows the operation | movement of the solar thermal hot-water supply system which concerns on this embodiment, Comprising: The flow of hot water in the time zone before a large amount of warm water is used is shown, and the case where heat exchange is performed is shown.

  Hereinafter, preferred embodiments of the present invention will be described based on the drawings. The present invention is not limited to the embodiments shown below, and can be appropriately modified without departing from the scope of the present invention. In the following description, hot water is a concept including hot water and cold water of all temperatures. Furthermore, in the following description, warm water may be a temperature higher than cold water (cold water may be a temperature lower than warm water), and the temperature range of hot water and cold water is not limited. .

  FIG. 1 is a configuration diagram showing a solar heat utilization hot water supply system 1 according to the present embodiment. As shown in FIG. 1, the solar heat utilization hot water supply system 1 according to the present embodiment is provided with a hot water supply facility 10 and a solar heat collection unit 20, and the solar thermal heat collection unit 20 is connected upstream of the hot water supply equipment 10. Such a solar heating and hot water supply system 1 is installed, for example, in a nursing home such as a nursing home for the elderly or a health care facility for the elderly.

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

  The boiler-bound pipe 13 a is a pipe for supplying hot and cold water from the hot water storage tank 12 to the heat source machine 11, and the boiler return pipe 13 b is a pipe for returning hot and cold water heated by the heat source machine 11 to the hot water storage tank 12. The first pump 14a is provided on the boiler return pipe 13b. With such a configuration, when the first pump 14a is operated, hot and cold water is circulated in order of the boiler going piping 13a, the heat source unit 11, the boiler return piping 13b and the hot water storage tank 12, and the heat source unit 11 is The hot and cold water is heated by the

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

  In addition, a plurality of faucets etc. are continuously provided in the piping by the side of the consumer who connects the hot water supply going piping 13c and the hot water supply return piping 13d, and hot water from the hot water storage tank 12 no matter which faucets etc. are operated. Is supposed to be open to the public.

  The solar heat collecting unit 20 includes a heat collecting unit 21 and a water storage tank (second 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 is configured of a heat collection panel 21a, a heat exchanger 21b, a circulation pipe 21c, and a third pump 21d. The heat collection panel 21a heats a heat medium using solar heat, and is installed at a position where it is easy to receive sunlight, such as on a roof. The heat exchanger 21b is provided at the lower inside of the hot water storage tank 22, introduces the heat medium heated by the heat collection panel 21a, and heats the hot water by heat exchange with the hot water of the lower part of the hot water storage tank 22. .

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

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

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

  Furthermore, a heat exchange unit 30 is provided between the hot water supply system 10 and the solar heat collecting unit 20. The heat exchange unit 30 includes internal pipes 31 a to 31 e, two-way valves 32 a to 32 e, pumps 33 a and 33 b, and a heat exchanger 34. The heat exchange unit 30 further 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.

  The ports P1 to P5 are portions serving as connection ports connected to the pipes 13e, 13f, 23, 24, and 50, the first port P1 is connected to the water pipe 50, and the second port P2 is introduced cold water It is connected to the piping 23. The third port P3 is connected to the individual hot water discharge 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 31a is a pipe that connects the first port P1 and the second port P2, and is a pipe that guides the cold water from the water pipe 50 to the hot water storage tank 22 of the solar heat collecting unit 20. The second pipe 31 b is a pipe that connects the third port P 3 and the fourth port P 4, and is a pipe that guides hot and cold 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 31c is a pipe connecting the branch point B on the first pipe 31a and the branch point C on the second pipe 31b, and guides the 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 is a branch point D on the second port P2 side of the first pipe 31a than the branch point B, and a branch point E on the third port P3 side of the second pipe 31b than the branch point C. It is piping to connect. The fifth pipe 31e is a pipe that connects the fifth port P5 and the branch point F between the branch points CE in the second pipe 31b.

  Five two-way valves 32a to 32e are provided in such pipes 31a to 31e. 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. Also, 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 5th piping 31e.

  The pumps 33a and 33b are power sources for transferring hot and cold water. Among them, 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 directed to the fourth two-way valve 32d side. It generates the power to transfer. 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 hot and cold 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 31 d and the hot water flowing through the fifth pipe 31 e. The heat exchanger 34 has, for example, a first chamber connected to the fourth pipe 31 d and a second chamber connected to the fifth pipe 31 e, and heat exchange is performed 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 heat utilization hot water supply system 1 as described above, either the hot water stored in the hot water storage tank 22 of the solar heat collection unit 20 or the cold water from the water pipe 50 is supplied to the hot water storage tank 12 of the hot water supply facility 10 it can. And solar heat utilization hot-water supply system 1 is trying to reduce the possibility that hot water shortage will occur, using such two operation states. Of the two operating states, the operating state in which the hot and cold 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 the first operating state. An operating 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 operating state.

  Hereinafter, the operation of the solar heat utilization hot water supply system 1 according to the present embodiment will be described. FIG. 2 is a diagram showing the operation of the solar thermal water heating system 1 according to the present embodiment, and shows the flow of hot and cold water in a time zone before a large amount of hot water is used. In addition, it shows that hot water flows in the piping part shown by a thick line in FIG. 2, and shows that the hot water does not flow in the piping part shown by a thin line.

  As shown in FIG. 2, the solar heating and 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, the hot and cold water is not discharged from the individual hot water discharge pipe 24 of the solar heat collection unit 20, and the cold water of the water pipe 50 is not supplied to the hot water storage tank 22 of the solar heat collection unit 20.

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

  In this case, even if hot water is used on the demand side, the amount is the amount that can be covered by the heating of the heat source unit 11 (the 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 view showing the operation of the solar thermal water heating system 1 according to the present embodiment, and shows the flow of hot and cold water in a time zone in which a large amount of hot water is used. In addition, it shows that hot water flows in the piping part shown by a thick line in FIG. 3, and shows that the hot water does not flow in the piping part shown by a thin line.

  As shown in FIG. 3, the solar heat utilization hot-water supply system 1 will be in a 1st driving | running state in the time slot | zone (For example, it is a time slot | zone which is 9 am to 10 o'clock, and bath care is performed) where a lot of warm water is used. 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 open. 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, a relatively large amount of high temperature 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 in a time zone where a large amount of hot water is used. Ru. As a result, in a time zone where a large amount of hot water is used, a relatively large amount of high temperature hot water is supplied to the hot water storage tank 12 so as to reduce the possibility of the hot water shortage.

  However, as shown in FIG. 3, even if the first operation state is made in the time zone where a large amount of hot water is used, heat can be sufficiently collected when the weather is rain etc. in the second operation state. In addition, since hot water of a relatively large amount and high temperature can not be secured in the hot water storage tank 12, the hot water may be caused.

  Therefore, in the solar heat utilizing hot water supply system 1 according to the present embodiment, the hot water stored in the hot water storage tank 22 of the solar heat collecting unit 20 and the hot water stored in the hot water storage tank 12 of the hot water supply facility 10 are introduced A third operating state is possible that is replaced and returned to the respective hot water storage tank 22 and hot water storage tank 12.

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

  As described above, in the time zone before a large amount of hot water is used (for example, the day of the previous day), by setting the second operation state shown in FIG. Although the amount of heat secured is increased, when the amount of heat collection 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, the night before 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 brought into operation. Further, the heat source unit 11 is driven, and the hot and cold water in the hot water storage tank 12 of the hot water supply facility 10 is heated.

  Here, when it is in the above state, the hot and cold water in the lower part of the hot water storage tank 22 of the solar heat collecting unit 20 reaches the second port P2 of the heat exchange unit 30 through the cold water introduction pipe 23. The hot and cold water reaches the fourth pipe 31 d from the first pipe 31 a through the branch point D and is introduced into the heat exchanger 34. Thereafter, the hot and cold water reaches from the branch point E to the second pipe 31b from the heat exchanger 34 through the pump 33a and the fourth two-way valve 32d, and is returned to the top of the hot water storage 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 equipment 10 reaches the branch pipe 13f from the hot water supply return pipe 13d through the branch point A, and is introduced into the fifth pipe 31e from the branch pipe 13f through the fifth port P5 of the heat exchange unit 30. Be done. The hot and cold water is then introduced into the heat exchanger 34. Thereafter, the hot and cold 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.

  Thus, heat exchange is performed by introducing the hot and cold water in the lower part of the hot water storage tank 22 and the hot and cold water in the upper part of the hot water storage tank 12 into the heat exchanger 34. It will be migrated.

  Thus, even if a large amount of hot water is not stored in the hot water storage tank 22 depending on the second operating state, a large amount of hot water can be stored in the hot water storage tank 22 by setting the third operating state. Hot water of high temperature can be stored, and the possibility of running out of water can be further reduced.

  Although the third two-way valve 32c is described and illustrated as being in the closed state in the above and FIG. 4, it is preferable that the third two-way valve 32c be in the open state in the third operating state. Thereby, it is possible to prevent a situation where it is not possible to tap water when there is a hot water discharge on the consumer side while performing heat exchange.

  In this manner, according to the solar heat utilization hot water supply system 1 according to the present embodiment, either one of the hot water stored in the hot water storage tank 22 of the solar heat collection unit 20 and the cold water from the water pipe 50 of the hot water supply facility 10 In order to supply two-way valves 32a to 32c to be supplied to the hot water storage tank 12, for example, if cold water is supplied to the hot water storage tank 12 of the hot water supply facility 10, hot water is supplied to the hot water storage tank 12 in the solar heat collecting unit 20. The heating can be continued without heating, and a relatively large amount of hot water can be secured in the hot water storage 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 during a large amount of hot water use time, heating by the heat source machine 11 is not enough to cause hot water shortage. It is possible to reduce the possibility of

  Here, 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 can continue heating without supplying hot and cold water to the hot water storage tank 12, but even in this case If the heat collection amount such as rainy weather runs short, heat exchange is performed using the heat exchange unit 30, so the heat amount of the hot water of the hot water storage tank 12 side heated by the heat source unit 11 is collected by the solar heat It can be made to transfer to the hot water of 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 water can be secured in the solar heat collecting unit 20, which further increases the possibility of causing a water shortage. It can be reduced.

  In addition, as described above, the heat exchange unit 30 exchanges heat by introducing the hot water stored in the hot water storage tank 22 of the solar heat collecting unit 20 and the hot water stored in the hot water storage tank 12 of the hot water supply facility 10. In order to do this, it is not necessary to provide the heating mechanism of the heat medium in the heat source unit 11 itself.

  Therefore, it is not necessary to use a heat source machine having a function of heating the heat medium, and it is possible to further reduce the possibility of water breakage when a large amount of hot water is used in a specific time zone.

  In addition, since the heat exchange unit 30 has 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. It is possible to switch between the state in which the 22 hot water of the hot water storage tank of the solar heat collecting unit 20 is supplied to the hot water storage tank 12 of the hot water supply facility 10 .

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

  In addition, since the heat exchange unit 30 opens the third two-way valve 32c in the third operation state, it is not possible to take out hot water if there is a hot water on the consumer side while performing heat exchange. It is possible to prevent the situation that

  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 it is possible to reduce the possibility of running out of water, it is possible to increase the number of customers for day service etc. in properties with a large amount of hot water supply such as special nursing homes for the elderly and nursing home health facilities.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to the said embodiment, A change may be added in the range which does not deviate from the meaning of this invention, Each implementation in the possible range You may combine the technique as described in a form.

  For example, although the solar heat utilization hot-water supply system 1 is provided with one solar heat collection unit 20 on the upstream side of the hot water supply facility 10 in the above embodiment, the present invention is not limited to this, and a plurality of solar heat collection units 20 are provided. May be In this case, the heat exchange units 30 may be provided for the number of solar heat collecting units 20, or the pipes 23, 24 of the plurality of solar heat collecting units 20 are connected in the middle to make 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 the system in which the heat medium is circulated, and may be a system in which hot and cold water is circulated.

  Further, in the present embodiment, one of the switching valves for supplying either the hot water stored in the hot water storage tank 22 of the solar heat collecting unit 20 or the cold water from the water pipe 50 to the hot water storage tank 12 of the hot water supply facility 10 is one. It may be configured by a three-way valve or the like. And such a three-way valve may be equipped with the heat exchange unit 30 which had the heat exchanger 34 separately.

  Furthermore, in the present embodiment, in the seasons where hot water shortage does not occur other than winter, the operation shown in FIG. 3 may be performed at all times without the operation shown in FIGS. 2 and 4. .

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

1: Solar heat utilization hot water supply system 10: Hot water supply equipment 11: Heat source machine 12: Hot water storage tank (1st hot water storage tank)
13a: Boiler piping 13b: Boiler return piping 13c: Hot water supply piping 13d: Hot water supply return piping 13e: Introduction piping 13f: Branch piping 14a, 14b: Pump 15: Hot water supply temperature sensor 20: Solar heat collecting unit 21: Heat collecting unit 21a : Heat collection panel 21 b: Heat exchanger 21 c: Circulation piping 21 d: Pump 22: Water storage tank (second water storage tank)
23: cold water introduction piping 24: individual hot water discharge 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 , First switching valve)
32b: Second two-way valve (switching valve, second switching valve)
32c: 3rd two-way valve (switching valve, 3rd switching valve)
32d: fourth two-way valve 32e: fifth two-way valve 33a, 33b: pump 34: heat exchanger 50: water pipes P1 to P5: first to fifth ports

Claims (4)

A hot water supply facility having a heat source unit and a first storage tank for storing hot water heated by the heat source unit, and supplying hot water stored in the first storage tank to a consumer.
A solar heat collecting unit comprising: a heat collecting unit for heating cold water using solar heat; and a second water storage tank for storing hot water heated by the heat collecting unit;
A switching valve for supplying either the hot water stored in the second storage tank of the solar heat collecting unit or the cold water from the water pipe to the first storage tank of the hot water supply facility;
Heat exchange unit for introducing and heat exchanging the hot water stored in the second water storage tank of the solar heat collecting unit with the hot water stored in the first water storage tank of the hot water supply facility and returning it to the respective water storage tanks When,
A solar heating hot water supply system characterized by comprising. The switching valve is a first switching valve provided on a first pipe for guiding cold water from a water pipe to a second storage tank of the solar heat collecting unit, and hot and cold water from the second storage tank of the solar heat collecting unit A second switching valve provided on the second pipe leading to the first water storage tank of the hot water supply facility, and a third switching valve provided on the third pipe leading the cold water from the water pipe to the first water storage tank of the hot water supply facility And consists of
The solar heat utilization hot water supply system according to claim 1, wherein the heat exchange unit has the first, second and third pipes and the first, second and third switching valves. The heat exchange unit is
A first operation 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 operation 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 introducing heat exchange between the hot water stored in the second water storage tank of the solar heat collecting unit and the hot water stored in the first water storage tank of the hot water supply facility, and returning it to the respective water storage tanks It is possible to switch between the states. The solar heating hot water supply system according to claim 2, The solar heat utilization 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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