JP2017062055A - Radiation cooling panel and air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiation cooling panel and an air conditioning system, capable of suppressing deterioration of a cooling effect in a room.SOLUTION: A radiation cooling panel 10 includes: a heat insulation container 12 that comprises a heat insulation member, and in which an opening 12a is formed from one surface side; a permeable body 13 provided so as to cover an opening 12a formed in the heat insulation container 12, and enabling infrared ray to be permeated; and a heat radiation body 11 installed in the heat insulation container 12, and capable of cooling the heat radiation body itself by a heat radiation phenomenon and performing heat exchange between itself and introduced air to cool the air. A plurality of permeable bodies 13 are installed between the heat radiation body 11 and an opening end 12d of the heat insulation container 12.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a radiant cooling panel and an air conditioning system.

  Conventionally, a radiant cooling panel that cools air by using a heat radiation phenomenon has been proposed. This radiant cooling panel includes a heat insulating container having one surface opened, a translucent plate covering the opening of the heat insulating container, and a heat radiator provided to cover the opening inside the translucent plate. A thermal radiator reflects sunlight (visible light) and emits heat, and thermal radiation at wavelengths in the infrared region exceeds thermal radiation from the atmosphere. For this reason, the heat radiator loses heat, and the inside of the radiation cooling panel is cooled. Such a radiant cooling panel is used in an air conditioning system that introduces air and supplies low-temperature air into the room (see Patent Document 1).

JP 61-223468 A

  Here, in the radiation cooling panel described in Patent Document 1, the heat of the outside air is transmitted to the light transmissive plate, and the temperature of the light transmissive plate is substantially the outside air temperature. However, since the radiant cooling panel is usually installed at an angle, the temperature difference is the driving force in the air layer between the thermal radiator and the translucent plate, generating natural convection and heating the thermal radiator. End up. As a result, the heat radiator cannot be kept at a low temperature, and the cooling effect of the room or the like is lowered.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a radiant cooling panel and an air conditioning system that can suppress a decrease in the cooling effect of a room or the like. is there.

  The radiant cooling panel of the present invention is constituted by a heat insulating member, and is provided so as to close the heat insulating container having an opening formed from one side thereof, and the opening formed in the heat insulating container, and is transmissive to infrared rays. And a thermal radiator that is installed in the heat insulation container and is cooled by the radiation phenomenon of heat and cools the cooled object by performing heat exchange with the cooled object introduced, A plurality of the transmissive bodies are installed between the thermal radiator and the open end of the heat insulating container.

  According to the radiation cooling panel of the present invention, since a plurality of transmission bodies are installed between the heat radiation body and the opening end of the heat insulating container, each air is separated by the plurality of transmission bodies. A layer is formed. Therefore, even if the temperature difference becomes a driving force and natural convection occurs, the heat radiator is less likely to be heated due to the separation between the layers, and a decrease in the cooling effect of the room or the like can be suppressed.

  In this radiation cooling panel, the heat radiator is a plate material, and it is preferable to exchange heat with a cooled object introduced on both sides of the plate material.

  According to this radiant cooling panel, the heat radiator exchanges heat with the cooled object introduced on both sides of the plate material, so heat exchange with the introduced cooled object can be performed efficiently, and the cooling effect of the room and the like is improved. Can be achieved.

  In this radiant cooling panel, the object to be cooled is air and liquid, and further includes a water channel arranged adjacent to the heat radiator, and the heat radiator is introduced into the introduced air and the water channel. It is preferable to exchange heat with the flowing liquid.

  According to the radiant cooling panel, the water radiator disposed further adjacent to the heat radiator is further provided, and the heat radiator further performs heat exchange with the liquid flowing in the water channel. For this reason, heat exchange not only with air but also with liquid can be performed.

  An air conditioning system according to the present invention includes a radiant cooling panel according to any one of the above, which includes air in a body to be cooled and is disposed in an inclined manner, and a vertical upper side of the radiant cooling panel that is inclined to take in indoor air. And a second flow path connected to a vertically lower side of the radiant cooling panel and supplying air cooled by the radiant cooling panel to the room.

  According to the air conditioning system of the present invention, the radiation cooling panel, the first flow path that is supplied to the vertically upper side of the radiation cooling panel that is inclined, and the second flow path that is connected to the vertically lower side of the radiation cooling panel are provided. Therefore, the indoor air is supplied to the vertical upper side of the radiant cooling panel through the first flow path, gradually moves downward by cooling with the radiant cooling panel, and is connected to the vertical lower side of the radiant cooling panel. It will be returned to the room through the two flow paths. In this way, the cooling air can be supplied into the room by natural circulation without requiring power for transferring air such as a fan.

  ADVANTAGE OF THE INVENTION According to this invention, the radiation | emission cooling panel and air conditioning system which can suppress the fall of the cooling effects, such as a room | chamber interior, can be provided.

It is a schematic structure figure showing an air-conditioning system concerning an embodiment of the present invention. It is an expanded sectional view of the radiation cooling panel shown in FIG. It is a graph which shows the temperature transition of an outside temperature sensor and a radiation surface temperature sensor. It is an expanded sectional view of the modification of the radiation cooling panel concerning this embodiment.

  Hereinafter, the present invention will be described according to preferred embodiments. Note that the present invention is not limited to the embodiments described below, and can be appropriately changed without departing from the spirit of the present invention. Further, in the embodiment described below, there is a part where illustration or description of a part of the configuration is omitted, but details of the omitted technology are within a range in which there is no contradiction with the contents described below. Needless to say, known or well-known techniques are applied as appropriate.

  FIG. 1 is a schematic configuration diagram illustrating an air conditioning system according to an embodiment of the present invention. An air conditioning system 1 shown in FIG. 1 cools indoor air and includes a radiation cooling panel 10, a first flow path 20, and a second flow path 30.

  The radiant cooling panel 10 includes a thermal radiator 11 that cools air (a body to be cooled) using a radiation phenomenon of heat. Although this radiation cooling panel 10 is based on the structure of the heat radiator 11, it is inclinedly arranged in the location where solar radiation is interrupted, for example.

  One end of the first flow path 20 is connected to the vicinity of the ceiling in the room, and the other end is connected to the vertical upper side of the radiation cooling panel 10 that is inclined. The second flow path 30 is connected to the vertically lower side of the radiation cooling panel 10 whose one end is inclined and the other end is connected to the vicinity of the ceiling in the room.

  Due to such a configuration, warm air in the room rises (see arrow A1) and is supplied to the vertical upper side of the radiant cooling panel 10 that is inclinedly arranged through the first flow path 20 (see arrow A2). In the radiant cooling panel 10, the heat radiator 11 cooled by the heat radiation phenomenon is installed in an inclined state similar to that of the radiant cooling panel 10, and the warm air is gradually cooled by heat exchange with the heat radiator 11. Go. Further, since the air descends by being cooled, the air is cooled while descending along the thermal radiator 11 that is inclined (see arrow A3).

  The cooled air reaches the connecting portion with the second flow path 30 on the vertical lower side of the radiant cooling panel 10 and is supplied indoors through the second flow path 30 (see arrow A4). Thereby, indoor cooling is realized using natural circulation of air.

  The air cooled by the radiant cooling panel 10 may be directly blown into the room, or may be blown into the room through another member that disperses the cooling air.

  FIG. 2 is an enlarged cross-sectional view of the radiant cooling panel 10 shown in FIG. As shown in FIG. 2, the radiant cooling panel 10 includes a heat insulating container 12, a transmissive body 13, and a casing 14 in addition to the heat radiating body 11.

  The heat insulating container 12 is a box made of a heat insulating material such as polystyrene foam, and an opening 12a is formed so that the upper surface side of the box is penetrated. Here, it is preferable that the reflectance of visible light or infrared light be higher than a predetermined value by attaching an aluminum tape to the inner surface of the heat insulating container 12 (wall portion of the opening 12a). The heat insulating container 12 has openings 12b and 12c for connection to the first flow path 20 and the second flow path 30.

  The transmissive body 13 is a sheet-like or plate-like member having a light-transmitting property with respect to infrared rays provided by closing the opening 12 a of the heat insulating container 12. The transmissive body 13 is made of, for example, a resin sheet (for example, a moisture retaining film) such as polyethylene or polypropylene, or infrared transmissive glass. In the following description, closing the opening 12a does not cover only the opening end 12d, but if the entire area where the opening 12a is formed is closed in plan view in the direction of the arrow A, the depth is questionable. is not.

  The thermal radiator 11 is installed in the heat insulating container 12 and is cooled by the heat radiation phenomenon and cools the air by exchanging heat with the introduced air. This thermal radiator 11 is made of a plate material, and has a black paint (having a high reflectance with respect to sunlight and an infrared light emissivity higher than a predetermined value on the surface of the plate material (opening end 12d side). For example, black titanium oxide) is applied. This is because it is not necessary to block sunlight by reflecting sunlight while having a cooling effect. Moreover, the reflectance of visible light or infrared rays is made higher than a predetermined value by attaching an aluminum tape on the back surface of the plate material.

  Further, the heat radiator 11 is installed without completely closing the opening 12a, for example, by providing a hole in the plate material. For this reason, the heat radiator 11 can exchange heat between the air from the first flow path 20 and both surfaces of the plate material. In addition, although the heat radiator 11 is attached to the heat insulation container 12 directly or indirectly through another member, it is preferable that the contact area is as small as possible.

  The casing 14 is a metal member for reinforcing the heat insulating container 12 to ensure the durability of the radiant cooling panel 10. The casing 14 is used to connect the opening 12 a, the first flow path 20, and the second flow path 30. Except for the openings 12b and 12c, the entire periphery of the radiation cooling panel 10 is covered.

  Further, in the present embodiment, a plurality of transmission bodies 13 are installed between the thermal radiator 11 and the opening end 12d of the heat insulating container 12 so as to close the opening 12a. Specifically, the number of the transmission bodies 13 is three. For example, the first transmission body 13a is provided at the opening end 12d, and the second transmission body 13b is provided between the first transmission body 13a and the heat radiator 11, A third transmissive body 13 c is provided between the second transmissive body 13 b and the thermal radiator 11.

  By providing such three pieces of the transmitting bodies 13a to 13c, a two-stage heat insulating layer made of air is formed. In addition, it is preferable that the space | interval of each depth direction of the three transmission bodies 13a-13c becomes 10 mm or less. This is because heat convection hardly occurs. In addition, in the above, the transmissive bodies 13a to 13c need to have translucency with respect to infrared rays.

  Next, the operation of the radiant cooling panel 10 according to the present embodiment will be described. First, the radiant cooling panel 10 receives heat radiation from the atmosphere and the sky. Further, the thermal radiator 11 radiates heat to the atmosphere and the sky. The thermal radiation of the thermal radiator 11 exceeds the thermal radiation from the atmosphere and the sky at wavelengths in the infrared region. For this reason, the thermal radiator 11 is cooled.

  Here, air is introduced into the radiation cooling panel 10 from the opening 12 b for connection with the first flow path 20. The introduced air is heat-exchanged and cooled in the process of flowing on both sides of the thermal radiator 11. And the cooled air is discharged | emitted outside from the opening part 12c for a connection with the 2nd flow path 30. FIG.

  Here, in the present embodiment, three transmissive bodies 13 are installed between the heat radiator 11 and the open end 12 d of the heat insulating container 12. Therefore, a two-stage air layer is formed by being separated by the three transmission bodies 13a to 13c. Therefore, even if the temperature difference becomes a driving force and thermal convection is generated, the thermal radiator 11 is hardly heated due to the separation between the layers. In particular, if the interval between the three transmission bodies 13a to 13c is set to 10 mm or less, thermal convection hardly occurs in the first place, and the heat insulating effect is further enhanced. As described above, the cooling effect of the room or the like can be improved.

  Next, experimental results using the radiation cooling panel 10 according to the present embodiment will be described. In this experiment, a steel plate having a thickness of 0.5 mm was used as the thermal radiator 11, matte black coating was applied to the surface, and aluminum tape was attached to the back surface. The heat insulating container 12 was made of foamed polystyrene having a thickness of 50 mm, and an aluminum tape was attached to the inner wall portion of the opening 12a. Three polyethylene moisturizing films were used for the transmission body 13.

  An outside air temperature sensor was provided outside the radiation cooling panel 10, and a radiation surface temperature sensor was attached to the back side of the heat radiator 11. FIG. 3 is a graph showing temperature transitions of the outside air temperature sensor and the radiation surface temperature sensor.

  As shown in FIG. 3, the temperature detected by the outside air temperature sensor gradually decreases after 19:00 on the previous day, is slightly over 21 ° C. at 19:00, reaches around 20 ° C. around 20:30, and reaches 22:50. The temperature became slightly over 17 ° C. After that, the temperature detected by the outside air temperature sensor changed in a range from a little less than 15 ° C. to a little over 16 ° C. until 5 o'clock the next day.

  On the other hand, the temperature detected by the radiation surface temperature sensor was a little over 21 ° C. at 19:00 the day before, was around 7 ° C. around 20:30, and was a little less than 4 ° C. around 22:50. Thereafter, the temperature detected by the radiation surface temperature sensor changed in a range from about 4 ° C. to about 8 ° C. until 5 o'clock the next day.

  In particular, the temperature difference between them reached a maximum value of 14.4 ° C. around 22:50. Here, in the experimental result described in Patent Document 1, it was found that the cooling effect was improved because the temperature difference from the outside air was within 7.8 ° C. to 9.3 ° C.

  Thus, according to the radiation cooling panel 10 according to the present embodiment, a plurality of transmission bodies 13 are installed between the heat radiation body 11 and the opening end 12d of the heat insulating container 12, and thus a plurality of transmission bodies 13 are installed. Each air layer is formed by being separated by the transparent bodies 13a to 13c. Therefore, even if the temperature difference becomes a driving force and natural convection occurs, the heat radiator 11 is not easily heated because of the separation between the layers, and a decrease in the cooling effect of the room or the like can be suppressed.

  Further, since the heat radiator 11 exchanges heat with the air introduced on both sides of the plate material, heat exchange with the introduced air can be performed efficiently, and the cooling effect of the room or the like can be improved.

  Further, according to the air conditioning system 1 according to the present embodiment, the radiation cooling panel 10, the first flow path 20 that is supplied to the vertically upper side of the radiation cooling panel 10 that is inclined, and the vertically lower side of the radiation cooling panel 10. The indoor air is supplied to the vertical upper side of the radiant cooling panel 10 through the first flow path 20 and gradually moves downward in the vertical direction due to the cooling by the radiant cooling panel 10. Then, it is returned to the room through the second flow path 30 connected to the vertical lower side of the radiation cooling panel 10. In this way, the cooling air can be supplied into the room by natural circulation without requiring power for transferring air such as a fan.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to the said embodiment, You may add a change in the range which does not deviate from the meaning of this invention, and combines each embodiment. Also good.

  FIG. 4 is an enlarged cross-sectional view of a modified example of the radiation cooling panel 10 according to the present embodiment. As shown in FIG. 4, the radiation cooling panel 10 according to the modification includes a water channel 15. The water channel 15 is disposed adjacent to the heat radiator 11 on the back side of the heat radiator 11, and the heat radiator 11 also exchanges heat with water (liquid) flowing through the water channel 15. One end of the water channel 15 is connected to the opening 12 b for connection to the first flow path 20, and the other end is connected to the opening 12 c for connection to the second flow path 30. Thus, the radiation cooling panel 10 is not limited to the above-described configuration, and may have another configuration such as the water channel 15. This is because heat can be exchanged not only with air but also with water.

  In addition, the radiant cooling panel 10 according to the modified example of FIG. 4 is configured such that both air and liquid are objects to be cooled. However, the configuration is not limited thereto, and only the liquid may be configured to be cooled. . Further, the water channel 15 may be provided adjacent to both sides of the heat radiator 11, and the liquid may also be configured to be able to exchange heat on both sides of the heat radiator 11.

  Moreover, although the radiation cooling panel 1 which uses only air as a to-be-cooled body is used in the air conditioning system 1 according to the present embodiment, not only air but also air and liquid as shown in the modification of FIG. A radiant cooling panel 10 may be used in which both are cooled. At this time, air can naturally circulate, but it goes without saying that the liquid is driven using a pump or the like.

  Furthermore, if possible, the radiant cooling panel 10 that exchanges heat with only the liquid may be used, and the cooling liquid obtained by the radiant cooling panel 10 may be used as a refrigerant of the air conditioning equipment. This is also because the room can be cooled.

1: Air-conditioning system 10: Radiation cooling panel 11: Thermal radiator 12: Thermal insulation container 12a: Opening 12b, 12c: Opening 12d: Open end 13, 13a-13c: Permeator 14: Casing 15: Waterway 20: First flow Path 30: second flow path

Claims (4)

A heat insulating container constituted by a heat insulating member and having an opening formed from one side; and
A transparent body that is provided so as to close the opening formed in the heat-insulating container, and is transparent to infrared rays;
A thermal radiator that is installed in the heat insulating container and is cooled by the radiation phenomenon of heat and cools the cooled object by performing heat exchange with the cooled object introduced,
A plurality of the transmissive bodies are installed between the thermal radiator and the open end of the heat insulating container. The radiant cooling panel according to claim 1, wherein the heat radiator is a plate material, and exchanges heat with a body to be cooled introduced on both sides of the plate material. The object to be cooled is air and liquid,
Further comprising a water channel disposed adjacent to the thermal radiator;
The radiant cooling panel according to claim 1, wherein the heat radiator exchanges heat with the introduced air and a liquid flowing in the water channel. The radiant cooling panel according to any one of claims 1 to 3, wherein the object to be cooled includes air and is disposed at an inclination.
A first flow path that takes in indoor air and supplies the air to a vertically upper side of the radiation cooling panel that is inclined and disposed;
A second flow path connected to a vertically lower side of the radiant cooling panel and supplying air cooled by the radiant cooling panel into the room;
An air conditioning system comprising:

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