JP2014126247A - Evaporative cooler and energy saving system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evaporative cooler which can improve the cooling efficiency and to provide an energy saving system using the evaporative cooler.SOLUTION: An evaporative cooler includes a cylindrical rotating member 20 which has a hollow part formed toward the vertical direction and can attach water to the inside surface of the hollow part, a driving means 40 which rotates the rotating member 20 around an axial line and a first blowing means 50 which blows gas so as to circulate the interior of the rotating member 20, and performs the cooling by utilizing evaporative heat of the water. Further, the evaporative cooler 10 includes a cylindrical outer side member 30 disposed so as to surround the rotating member 20 from the outside and a second blowing means 60 which blows air so as to be circulated through a space sandwiched by the rotating member 20 and the outer side member 30.

Description

  The present invention relates to a vaporization cooler that performs cooling using the heat of vaporization of a cooling medium, and a technology of an energy saving system using the same.

  2. Description of the Related Art Conventionally, a technique of a vaporization cooler that performs cooling using vaporization heat of a cooling medium has been publicly known. For example, as described in Patent Document 1.

  Patent Document 1 discloses a first cooling flow path (wet channel) that cools gas (air) by using the heat of vaporization of a cooling medium (water), and heat of vaporization in the first cooling flow path. A technique of a vaporization cooler (indirect vaporization cooler) including a second cooling flow path (dry channel) that performs cooling using cold heat generated by the above-mentioned is known.

  With such a configuration, the evaporative cooler disclosed in Patent Document 1 can cool the air flowing through the second cooling flow path and use the cooled air for air conditioning or the like.

  Further, as a technique related to a vaporization cooler using the heat of vaporization of such a cooling medium, a cooling medium (for example, water) is sprayed and attached to the wall surface of the cooling channel, and a gas (for example, air) is attached to the cooling channel. There is a vaporization cooler that performs cooling using the vaporization heat of the cooling medium.

  However, in such a vaporization cooler, the cooling medium adhering to the wall surface of the cooling channel becomes substantially hemispherical due to the surface tension, and the surface area (contact area with the gas flowing through the cooling channel) is reduced, and the cooling efficiency is improved. It was disadvantageous in that it deteriorated.

JP 2008-101890 A

  This invention is made | formed in view of the above situations, The subject which it is going to solve is providing the vaporization cooler which can aim at the improvement of cooling efficiency, and an energy-saving system using the same.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, according to the first aspect of the present invention, there is provided a cylindrical rotating member having a hollow portion formed in a predetermined axial direction and capable of adhering a cooling medium to the inner surface thereof, and the rotating member is connected to the axial line. Drive means for rotating around and first air blowing means for blowing gas so as to circulate in the rotating member, and cooling is performed using the heat of vaporization of the cooling medium.

  In Claim 2, The 2nd ventilation means which ventilates gas so that it may distribute | circulate the cylindrical outer member provided so that the said rotation member may be enclosed from the outer side, and the space pinched | interposed by the said rotation member and the said outer member. And.

  In Claim 3, said 1st ventilation means ventilates the said gas so that the gas which distribute | circulates the inside of the said rotation member turns into a swirl | vortex flow.

  According to a fourth aspect of the present invention, a plurality of fine convex portions are formed on the inner surface of the rotating member.

  In Claim 5, it is an energy-saving system using the vaporization cooler as described in any one of Claim 1- Claim 4, Comprising: Said waste heat from the hot water storage tank which stores hot water WHEREIN: Said 1st The air blown by the one blowing means or the second blowing means is performed.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect of the present invention, it is possible to improve the cooling efficiency by increasing the surface area of the cooling medium attached to the rotating member by centrifugal force.

  In Claim 2, since the gas (gas blown by the 2nd ventilation means) which distribute | circulates the space partitioned off from the inner side of the rotation member can be cooled, the low humidity gas which does not contain the evaporated cooling medium is used. Can be supplied.

  In Claim 3, the path | route at the time of the gas ventilated by the 1st ventilation means distribute | circulates the inside of a rotation member can be ensured long, and the improvement of cooling efficiency can be aimed at.

  In claim 4, by smoothing the surface of the cooling medium adhered to the rotating member, the surface area of the cooling medium can be increased, and the cooling efficiency can be improved.

  According to the fifth aspect of the present invention, it is possible to construct a more efficient energy saving system by using air that has been air-conditioned using exhaust heat in a vaporization cooler with good cooling efficiency.

1 is a front sectional view showing a vaporization cooler according to a first embodiment of the present invention. AA sectional drawing in FIG.1 and FIG.4. (A) BB sectional drawing in FIG.1 and FIG.4. (B) BB sectional drawing in FIG.1 and FIG.4 when the vaporization cooler is act | operating. Front sectional drawing when the evaporative cooler is operating. (A) The front cross-sectional enlarged view which showed the mode of the water adhering to the inner surface of a rotation member when the rotation member is not rotationally driven. (B) Similarly, the front cross-sectional enlarged view showing the case where the rotating member is rotationally driven. (A) The image figure which showed the convex part which concerns on 2nd embodiment. (B) Similarly, front sectional enlarged view. (C) Similarly, a front cross-sectional enlarged view showing a state where water is attached. The front perspective view which showed the drive means which concerns on 3rd embodiment. (A) Front sectional drawing which showed an example of the rotation member which concerns on 4th embodiment. (B) Similarly, front sectional view. (C) Similarly, front sectional view. (D) Similarly, front sectional view. (E) Similarly, front sectional view. The block diagram which showed an example of the energy-saving system using a vaporization cooler.

  Below, according to the arrow shown in the figure, the up-down direction, the left-right direction, and the front-back direction are defined.

  First, the configuration of the evaporative cooler 10 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3.

  The vaporization cooler 10 shown in FIGS. 1, 2 and 3 (a) cools air using the vaporization heat of water as a cooling medium, and uses the cooled air for air conditioning or the like. . The evaporative cooler 10 according to the present embodiment is a so-called indirect evaporative cooler in which air used for promoting the evaporation of water is different from air that is cooled and used for air conditioning or the like. The evaporative cooler 10 mainly includes a rotating member 20, an outer member 30, a driving unit 40, a first blowing unit 50, a second blowing unit 60, and a spraying unit 70.

  The rotating member 20 shown in FIG. 1 and FIG. 3A is a cylindrical member that is arranged with its longitudinal direction directed in the vertical direction. The rotary member 20 is formed with a cavity having a circular cross section in the axial direction (vertical direction). The rotating member 20 is formed of a material having high thermal conductivity.

  The outer member 30 shown in FIGS. 1, 2, and 3 (a) is a cylindrical member that is disposed with its longitudinal direction directed in the vertical direction. The outer member 30 is formed with a cavity having a circular cross section in the axial direction (vertical direction). The outer member 30 is disposed so as to surround the rotating member 20 from the outside. The outer member and the rotating member 20 are arranged so as not to contact each other, and a space is formed so as to be sandwiched between the outer member and the rotating member 20.

  The driving means 40 is for rotating the rotating member 20. The driving means 40 mainly includes a motor 41, a driving gear 42, a driven gear 43, a guide gear 44, and a bearing 45.

  The motor 41 is a drive source for rotating the rotary member 20. The motor 41 is disposed in a space (side of the rotating member 20) formed between the outer member 30 and the rotating member 20 with its output shaft facing downward.

  The drive gear 42 is fixed to the output shaft of the motor 41. The drive gear 42 is appropriately supported by the outer member 30.

  The driven gear 43 is formed on the outer peripheral surface of the rotating member 20. The driven gear 43 is meshed with the drive gear 42.

  A plurality of (three in this embodiment) guide gears 44 are arranged around the rotating member 20 so as to mesh with the driven gear 43.

  The bearing 45 supports the bottom part of the rotation member 20 so that rotation is possible. The bearing 45 is interposed between the support portion 30 a formed on the inner peripheral surface of the outer member 30 and the rotating member 20.

  When the motor 41 is driven in the driving means 40 configured as described above, the driving force of the motor 41 is transmitted to the rotating member 20 via the driving gear 42 and the driven gear 43. As a result, the rotating member 20 rotates about its axis (a straight line passing through the center of the circle of the rotating member 20 in the plan view (the center of the driven gear 43)).

  At this time, the rotating member 20 is supported by the bearing 45 so as to be rotatable from below. The rotating member 20 can be stably rotated without being inclined by the plurality of guide gears 44.

  The first air blowing means 50 blows air so as to circulate in the rotating member 20. The first air blowing means 50 mainly includes an introduction part 51, a first fan 52, a guide channel 53 and a discharge channel 54.

  The introduction part 51 is for guiding air into the rotary member 20. The introduction part 51 is formed in a substantially cylindrical shape whose upper part is closed. The diameter (inner diameter) of the introduction part 51 is formed to be substantially the same as the diameter (inner diameter) of the rotating member 20. The introduction part 51 is arranged so that the lower part (opened part) faces the upper part (opened part) of the rotating member 20 and is appropriately supported in a state separated from the rotating member 20.

  The first fan 52 feeds air into the rotary member 20. The first fan 52 is disposed outside the outer member 30.

  The guide channel 53 guides the air from the first fan 52 into the introduction part 51. One end (left end) of the guide channel 53 is arranged to face the first fan 52. The guide channel 53 is disposed so as to penetrate the outer member 30 and the introduction part 51, and the right end (air blowing port 53 a) of the guide channel 53 is disposed so as to face the introduction part 51.

  As shown in FIG. 1, the air blowing port 53a of the guide channel 53 is formed to face slightly downward. Further, as shown in FIG. 2, the air blowing port 53 a of the guide channel 53 is formed so as to face the vicinity of the inner side surface of the introduction portion 51 in a plan view.

  The discharge channel 54 shown in FIGS. 1, 2 and 3A guides the air in the rotating member 20 to the outside. One end (upper end) of the discharge channel 54 is disposed so as to face the lower portion (opened portion) of the rotating member 20. The other end of the discharge channel 54 extends to the outside of the outer member 30.

  The second air blowing means 60 shown in FIG. 1 blows air so as to circulate through the space between the rotating member 20 and the outer member 30. The 2nd ventilation means 60 is comprised with a fan. The second air blowing means 60 is provided at one end (upper end) of the outer member 30.

  The spray means 70 is for attaching water to the inner surface of the rotating member 20. The spray means 70 mainly includes a main body portion 71 and a spray port 72.

  The main body 71 is formed by appropriately bending an elongated cylindrical member. The front end portion (lower end portion) of the main body portion 71 is disposed inside the introduction portion 51 and the rotation member 20 (on the axis line of the rotation member 20) with the longitudinal direction thereof directed in the vertical direction. The other end of the main body 71 is connected to a pump (not shown) for pumping water.

  The spray ports 72 are a plurality of holes formed so as to communicate the inside and the outside of the main body 71. A plurality of spray ports 72 are formed at positions facing the inner surface of the rotating member 20.

  The motor 41 of the driving unit 40, the first fan 52 of the first blowing unit 50, the second blowing unit 60 (fan), and the pump (not shown) of the spraying unit 70 are connected to a control device (not shown), The operation is controlled by the control device.

  Next, the operation | movement aspect of the vaporization cooler 10 is demonstrated using FIGS. 3-5.

  First, the pump of the spray means 70 is driven, and water is sprayed from the spray port 72. The water adheres to the inner surface of the rotating member 20, and the inner surface of the rotating member 20 becomes wet. As shown in FIG. 5A, the water (W in FIG. 5) adhering to the rotating member 20 at this time is substantially hemispherical due to the surface tension.

  Next, the motor 41 of the drive means 40 is driven, and the drive gear 42 is rotationally driven clockwise in plan view (see FIG. 3B). As a result, the driven gear 43 is rotationally driven counterclockwise in plan view, and consequently, the rotating member 20 is rotationally driven counterclockwise in plan view.

  When the rotating member 20 is driven to rotate, centrifugal force is applied to the water adhering to the inner surface of the rotating member 20. Due to the centrifugal force, the water W is deformed into a shape that is crushed toward the inner surface of the rotating member 20 as shown in FIG. As a result, the surface area of the water W increases.

  Next, the first fan 52 and the second air blowing means 60 of the first air blowing means 50 are driven.

  When the first fan 52 is driven, the air blown by the first fan 52 flows into the introduction part 51 through the guide channel 53 and the blower port 53a. The air flowing in from the blower port 53a circulates downward while rotating clockwise in plan view along the inner surface of the introduction portion 51 and the rotation member 20. That is, the air that has flowed into the rotating member 20 flows as a swirling flow downward in the rotating member 20.

  At this time, evaporation of water adhering to the inner surface of the rotating member 20 is promoted by the flow of the air. The rotating member 20 is cooled by the heat of vaporization when the water evaporates.

  The air that circulates in the rotating member 20 while turning from the upper side to the lower side is discharged to the outside through the discharge flow dew 54.

  On the other hand, when the second air blowing means 60 is driven, air flows from the opened upper portion of the outer member 30 into the outer member 30. The air circulates downward inside the outer member 30 (more specifically, a space sandwiched between the outer member 30 and the rotating member 20).

  The air flowing downward inside the outer member 30 is cooled by the rotating member 20 when flowing in the vicinity of the rotating member 20 cooled as described above. The cooled air flows out from the opened lower portion of the outer member 30 to the outside. The air is guided to a desired place through a pipe (not shown) and can be used for air conditioning of the place.

  In the evaporative cooler 10 configured as described above, the rotational speed (rotational speed) of the rotating member 20 is appropriately measured while measuring the temperatures inside and outside the rotating member 20 (the space between the rotating member 20 and the outer member 30). ), Air at a desired temperature can be obtained by controlling the wind speed by the first blowing means 50, the wind speed by the second blowing means, and the spray amount of water by the spraying means 70.

As described above, the evaporative cooler 10 according to the present embodiment is
A cylindrical rotating member 20 having a hollow portion formed in the vertical direction (predetermined axial direction) and capable of adhering water (cooling medium) to the inner surface thereof;
Driving means 40 for rotating the rotating member 20 around the axis;
First blowing means 50 for blowing gas so as to circulate in the rotating member 20;
Comprising
Cooling is performed using the heat of vaporization of water.

By comprising in this way, the cooling efficiency can be improved by increasing the surface area of the water adhering to the rotating member 20 by centrifugal force.
That is, by increasing the surface area of water, the contact area with the air flowing through the rotating member 20 increases. Thereby, the evaporation of the water can be further promoted, and as a result, the cooling efficiency can be improved.

Further, the evaporative cooler 10 is
A cylindrical outer member 30 provided so as to surround the rotating member 20 from the outside;
Second air blowing means 60 for blowing air so as to circulate through the space sandwiched between the rotating member 20 and the outer member 30;
It comprises.

By comprising in this way, since the air (air blown by the 2nd ventilation means 60) which distribute | circulates the space partitioned off from the inner side of the rotation member 20 can be cooled, the humidity which does not contain the evaporated water Low air can be supplied.
That is, by constructing the so-called indirect type evaporative cooler 10, it is possible to supply cold air with low humidity.

Moreover, the 1st ventilation means 50 is
The air flowing in the rotating member 20 is blown so that the air turns into a swirling flow.

By comprising in this way, the path | route at the time of the air ventilated by the 1st ventilation means 50 distribute | circulating the inside of the rotating member 20 can be ensured long, and the improvement of cooling efficiency can be aimed at.
That is, by elongating the air flow path, evaporation of more water can be promoted, and as a result, the cooling efficiency can be improved.

  In the following, another embodiment of the present invention will be described.

  As a second embodiment of the present invention, it is possible to form a large number of convex portions 20a as shown in FIG. The convex portion 20a is a convex shape that protrudes inward of the rotating member 20, and is formed very small (finely). The convex portions 20a are formed in a state in which a large number are connected. For example, the peak pitch (X shown in FIG. 6B) of the protrusions 20a is formed to be about 450 μm (micrometer). Further, the peak height of the convex portion 20a (Y shown in FIG. 6B) is formed to be about 290 μm (micrometer).

  When water is sprayed from the spraying means 70 to the rotating member 20 configured in this way, the sprayed water enters between the convex portions 20a as shown in FIG. 6C. In this state, it adheres to the inner surface of the rotating member 20. And the water adhering to the inner surface of the rotating member 20 has a substantially flat surface (inward side).

  As described above, a plurality of fine convex portions 20a are formed on the inner surface of the rotating member 20 according to the present embodiment.

By comprising in this way, the surface of the water adhering to the rotating member 20 is smoothed, thereby increasing the surface area of the water and improving the cooling efficiency.
That is, in addition to the centrifugal force generated by the rotation of the rotating member 20, the surface of water can be leveled by the convex portion 20a, and the cooling efficiency can be further improved.

  The peak pitch (X shown in FIG. 6B) and the peak height (Y shown in FIG. 6B) of the convex portion 20a are not limited to the values according to the present embodiment, and are arbitrarily set. It is possible. Moreover, the shape of the convex part 20a is not limited to the shape which concerns on this embodiment, It can be made into arbitrary shapes.

  As a third embodiment of the present invention, the driving means 40 is not a driving system using gears (first embodiment (see FIG. 1 etc.)) but a driving system using a belt 47 as shown in FIG. It is also possible.

  The belt 47 is wound around the pulley 46 fixed to the output shaft of the motor 41 and the rotating member 20, and the driving force from the motor 41 is transmitted to the rotating member 20 via the pulley 46 and the belt 47. Is done. Thereby, the rotation member 20 can be rotationally driven.

  The drive means 40 is not limited to that shown in the first embodiment (see FIG. 1 and the like) and the third embodiment (see FIG. 7), and can rotate the rotating member 20 arbitrarily. I just need it.

  As a fourth embodiment of the present invention, as shown in FIG. 8, the rotating member 20 may have a shape whose diameter changes in the axial direction (vertical direction).

For example, as shown to Fig.8 (a), it is also possible to set it as the shape which diameter increases linearly in front sectional view as it goes below.
Further, as shown in FIG. 8 (b), it is possible to form a shape whose diameter decreases linearly in a front sectional view as it goes downward.
Moreover, as shown in FIG.8 (c), it is also possible to provide the part in which a diameter becomes small as it goes below in an up-and-down middle part.
Moreover, as shown in FIG.8 (d), it is also possible to set it as the shape where a diameter becomes small like a curve in front sectional view as it goes below.
Moreover, as shown in FIG.8 (e), it can also be set as the shape where a diameter becomes large in a curve shape in front sectional view, as it goes below.

  Thus, by making the rotary member 20 have a shape whose diameter changes in the axial direction (vertical direction), the flow velocity and the flow direction of the air flowing through the rotary member 20 are changed, and the cooling efficiency is appropriately improved. Can be achieved.

  Similarly, the outer member 30 can have a shape whose diameter changes in the axial direction (vertical direction).

  In each of the above embodiments, water is used as the cooling medium. However, the present invention is not limited to this, and various liquids can be used as the cooling medium.

  Moreover, in each said embodiment, although the 1st ventilation means 50 and the 2nd ventilation means 60 shall ventilate air, this invention is not restricted to this, Various gas can be used. .

  In each of the above embodiments, the rotating member 20 and the outer member 30 have a shape having a circular shape in cross section. However, the present invention is not limited to this, and a shape having a polygonal shape in cross section can also be used. is there.

  Further, in each of the above embodiments, the rotating member 20 and the outer member 30 are arranged with the longitudinal direction thereof being directed in the vertical direction, and the air circulates in the interior from the upper side to the lower side. This is not a limitation. That is, the rotating member 20 and the outer member 30 can be arranged with their longitudinal directions directed in arbitrary directions.

  In each of the above embodiments, the rotating member 20 is driven to rotate counterclockwise in plan view, and the air in the rotating member 20 turns clockwise in plan view (see FIG. 3B). Accordingly, the relative speed between the rotating member 20 and the air in the rotating member 20 is increased, and the cooling efficiency can be improved. However, the rotation direction of the rotating member 20 and the air in the rotating member 20 may be the same direction.

  Further, in each of the above embodiments, the spray means 70 is fixed and sprays water in a fixed direction (direction in which the spray port 72 is formed), but the present invention is not limited to this. . For example, in the main body 71 of the spray means 70, the portion where the spray port 72 is formed (the portion facing the inner surface of the rotating member 20) is rotationally driven by a motor or the like, and the inner surface of the rotating member 20 is evenly distributed. A configuration in which water is sprayed is also possible. Further, the number and positions of the spray ports 72 are not limited to those according to the above embodiments.

  Below, the energy-saving system 1 using the above-mentioned vaporization cooler 10 is demonstrated using FIG. In FIG. 9, solid arrows indicate the flow of water (hot water), two-dot chain arrows indicate the power flow, and broken arrows indicate the air flow.

  The energy saving system 1 shown in FIG. 9 is a system applied to a building such as a house or a commercial facility where power generation, hot water supply, air conditioning (cooling and heating) and the like are performed. The energy-saving system 1 aims at energy saving as the whole system by making a power generation device, a hot-water supply device, and an air-conditioning device mutually cooperate. The energy saving system 1 mainly includes a solar cell 2, a power storage device 3, a heat collector 4, a hot water tank 5, a thermal generator 6, a desiccant air conditioner 7, and a vaporization cooler 10.

  The solar cell 2 is installed in a sunny place such as on the roof of a building. Electric power generated using solar light in the solar cell 2 can be charged (charged) in the power storage device 3. The heat collector 4 is also installed in a sunny place like the solar battery 2, and water (hot water) heated by using sunlight in the heat collector 4 is stored in the hot water tank 5. In addition, electric power is generated in the thermoelectric generator 6 using the heat obtained in the heat collector 4, and the electric power can be charged in the power storage device 3.

  Hot water stored in the hot water tank 5 is supplied to a predetermined place of the building (hot water supply). Further, heat (exhaust heat) generated while being stored in the hot water tank 5 is supplied to a desiccant air conditioner 7 that can be regenerated at a low temperature together with hot water, and is used to regenerate the dehumidifying agent of the desiccant air conditioner 7. . Hot water that has been used for regeneration of the dehumidifying agent of the desiccant air conditioner 7 and whose temperature has further decreased is used for heating (low-temperature water heating), then returned to the heat collector 4 and again heated to a high temperature.

  Further, the outside air (air) dehumidified or humidified (air-conditioned) in the desiccant air conditioner 7 is supplied to the evaporative cooler 10. The air thus conditioned is supplied to the first blower 50 or the second blower 60 of the vaporizer 10 and circulates in the vaporizer 10 (see FIG. 4 and the like).

  For example, by supplying the dehumidified outside air to the second air blowing means 60 of the evaporative cooler 10, cold air with low humidity can be obtained. The air is supplied to a predetermined place of the building and used for cooling. Moreover, by supplying the dehumidified outside air to the first air blowing means 50 of the vaporization cooler 10, the evaporation of water in the rotating member 20 can be further promoted, and the cooling efficiency can be improved.

  Further, when the desiccant air conditioner 7 dehumidifies or humidifies (air-conditions), the outside air (air) that has become relatively hot is supplied to a predetermined place of the building as it is and used for heating.

As described above, the energy saving system 1 according to the present embodiment is
The exhaust air from the hot water storage tank 5 that stores hot water is used to air-condition the air blown by the first blower means 50 or the second blower means 60.

  Thus, the more efficient energy-saving system 1 can be constructed | assembled by using the air air-conditioned using exhaust heat for the vaporization cooler 10 with sufficient cooling efficiency.

  The evaporative cooler 10 can be applied not only to the energy saving system 1 but also to various systems, and energy saving (improvement of efficiency) of the system can be achieved.

DESCRIPTION OF SYMBOLS 1 Energy saving system 10 Evaporative cooler 20 Rotating member 20a Convex part 30 Outer member 40 Drive means 50 1st ventilation means 60 2nd ventilation means

Claims (5)

A cylindrical rotating member having a hollow portion formed in a predetermined axial direction and capable of attaching a cooling medium to the inner surface thereof;
Driving means for rotating the rotating member around the axis;
First blowing means for blowing gas so as to circulate in the rotating member;
Comprising
Cooling is performed using the heat of vaporization of the cooling medium,
Evaporative cooler. A cylindrical outer member provided so as to surround the rotating member from the outside;
Second blowing means for blowing gas so as to circulate through the space sandwiched between the rotating member and the outer member;
Characterized by comprising:
The evaporative cooler according to claim 1. The first air blowing means is
The gas flowing in the rotating member is blown so that the gas becomes a swirling flow,
The evaporative cooler according to claim 1 or 2. A plurality of fine convex portions are formed on the inner surface of the rotating member,
The evaporative cooler according to any one of claims 1 to 3. An energy saving system using the evaporative cooler according to any one of claims 1 to 4,
Utilizing exhaust heat from a hot water storage tank for storing hot water, the first air blowing means or the second air blowing means performs air conditioning of the gas blown,
Energy saving system.

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