JP2006214697A - Radiation panel and air conditioner system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiation panel capable of increasing the efficiency of heat transfer from a heat medium flow passage to a radiation plate by a simple structure and an air conditioner system using the radiation panel. <P>SOLUTION: This radiation panel comprises the heat medium flow passage 13 for flowing the heat medium therein and the radiation plate 11 receiving heat from the heat medium flowing in the heat medium flowing passage 13 and radiating the heat. The heat medium flow passage 13 comprises such a cross sectional shape that the contact area of the heat medium flow passage 13 with the radiation plate 11 is larger than in a case when the cross sectional shape of the heat medium flow passage 13 is assumed to be complete round. The radiation panel is disposed at at least one of the ceiling surface, floor surface, and wall surface of an air conditioned room. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a radiant panel and an air conditioning system, and more particularly to a radiant panel with improved heat transfer efficiency from a heat medium flow path to a radiant plate with a simple configuration, and an air conditioning system using such a radiant panel.

  Radiant air conditioning is currently attracting attention as an air conditioning system that achieves both energy saving and comfort. In radiant air conditioning, a radiant panel with a heat medium passage laid on a radiant plate is installed on the floor or ceiling, and cold water or hot water is flowed through the heat medium passage to raise or lower the temperature of the radiant plate. This is an air conditioning system. The intensity of radiant heat from the radiation plate is related to the amount of heat transferred from the heat medium flow path to the radiation plate. In order to increase the amount of heat transfer from the heat medium flow path to the radiation plate, it is common practice to lay the heat medium flow path on the radiation plate as densely as possible. On the other hand, in order to prevent water leakage, a long heat medium flow path is appropriately bent and laid on the radiation plate so as not to provide a connection portion in the heat medium flow path as much as possible. However, since there is a limit to reducing the bending radius from the viewpoint of the bending strength of the heat medium flow path, there is a certain limit to increasing the density of the heat medium flow path.

Under such circumstances, the heat medium flow path is laid as densely as possible on the radiation plate, and in order to further improve the heat transfer efficiency between the heat medium flow path and the radiation plate, a groove for piping is provided in the radiation panel. It has been practiced to lay the heat medium flow path in the concave groove (see, for example, Patent Document 1). Further, fins or the like have been provided in the heat medium flow path as means for increasing the heat radiation amount from the heat medium flow path without providing the concave groove portion (see, for example, Patent Document 2).
JP-A-11-315629 (paragraph 0006, FIG. 2, FIG. 3, etc.) JP-A-10-288386 (FIGS. 4, 5, etc.)

  However, in the means described in Patent Document 1, since the contact portion between the heat medium flow path and the radiation plate is increased, accuracy in the processing of the groove is required, and it takes time to process the groove. Further, in the means described in Patent Document 2, since the radiation fins are provided, it takes time to create the radiating panel, and the degree of freedom in laying the heat medium flow path in the field is restricted.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a radiant panel with improved heat transfer efficiency from a heat medium flow path to a radiant plate with a simple configuration, and an air conditioning system using such a radiant panel. .

  In order to achieve the above object, a radiant panel according to a first aspect of the present invention includes a heat medium flow path 13 through which a heat medium flows; for example, as shown in FIG. A radiation plate 11 that receives heat and radiates the heat; the heat medium flow path 13 and the heat medium flow path 13 and the radiation plate are compared with the case where the cross section of the heat medium flow path 13 is assumed to be a perfect circle. 11 has a cross-sectional shape in which the contact area with the electrode 11 is large. Here, the “perfect circle” of the cross-sectional shape does not mean that the cross-sectional shape is strictly a perfect circle, but is used for comparison with the flat cross-sectional shape described later. Even in the case where there is a strain of, a cross-sectional shape is designed to be circular.

  When configured in this way, the heat medium flow path has a cross-sectional shape such that the contact area between the heat medium flow path and the radiation plate is larger than when the cross-sectional shape of the heat medium flow path is assumed to be a perfect circle. Therefore, the heat transfer efficiency from the heat medium flow path to the radiant panel can be improved without providing a groove for laying the heat medium flow path in the radiant panel. “Receiving heat” means not only receiving heat but also receiving heat. In other words, not only when the radiation plate is heated by the heat medium but also when it is cooled, the radiation plate is expressed as “heat receiving”. In addition, “radiating” is expressed in this way not only for heat but also for cold. That is, strictly speaking, cold heat is not radiated from the radiant panel, but heat radiated from, for example, humans is absorbed by the radiant panel having a low temperature and is not reflected. In this specification, for the sake of convenience, cold heat is also expressed as “radiating”.

  In addition, the radiating panel according to the invention described in claim 2 is, for example, as shown in FIG. 2, in the radiating panel 10 according to claim 1 (see FIG. 1, for example), It has a flat shape, a semicircular shape, a rectangular shape, or a triangular shape.

  If comprised in this way, even if it does not provide the groove | channel for laying a heat carrier flow path in a radiation panel, the heat transfer efficiency from a heat carrier flow path to a radiation panel can be improved.

  Moreover, the radiation panel according to the invention described in claim 3 is, for example, as shown in FIG. 1, in the radiation panel 10 according to claim 1 or 2, a vent hole 12 is formed in the radiation plate 11. Yes.

  If comprised in this way, when a radiation panel is installed in an air-conditioned room, the radiation panel can be applied to an air-conditioning system that allows air to pass through the vent hole and makes the temperature distribution in the air-conditioned room substantially uniform by radiant heat and convection. It becomes.

  In order to achieve the above object, an air conditioning system according to a fourth aspect of the present invention is characterized in that the radiating panel 10 according to any one of the first to third aspects (see, for example, FIG. 1) The cooling medium is disposed in at least one of the ceiling surface, the floor surface, and the wall surface of the ceiling; when cooling the air-conditioned room, cold water is passed through the heat medium flow path 13 (see, for example, FIG. 1) to heat the air-conditioned room. It is configured to allow warm water to flow through the medium flow path 13 (see, for example, FIG. 1). Here, the radiating panel is disposed on the “surface” means that the radiating panel is pasted on the ceiling, floor, or wall that has already been formed, and that the radiating panel forms the ceiling, floor, or wall. May mean.

  With this configuration, an air conditioning system using a radiant panel that can improve the heat transfer efficiency from the heat medium flow path to the radiant panel without providing a groove for laying the heat medium flow path in the radiant panel. Can be provided.

  According to the present invention, the heat medium flow path has a cross-sectional shape such that the contact area between the heat medium flow path and the radiation plate is larger than when the cross-sectional shape of the heat medium flow path is assumed to be a perfect circle. Therefore, the heat transfer efficiency from the heat medium flow path to the radiant panel can be improved without providing a groove for laying the heat medium flow path in the radiant panel.

Embodiments of the present invention will be described below with reference to the drawings. In each figure, the same or equivalent devices are denoted by the same reference numerals, and redundant description is omitted.
FIG. 1 is a perspective view showing a radiation panel according to an embodiment of the present invention. The radiating panel 10 includes a radiating plate 11 and a heat medium flow path 13.

  The radiation plate 11 is a substantially rectangular plate and has a plurality of vent holes 12. The material of the radiation plate 11 is typically aluminum, but stainless steel or other materials with high thermal conductivity may be used. The plurality of air holes 12 formed in the radiation plate 11 are typically circular small holes. The size of the vent hole 12 formed in the radiation plate 11 is typically 3 mm to 15 mm, but the upper limit is preferably set from the viewpoint of decoration of the ceiling surface (so that the back of the ceiling cannot be seen from the vent hole). The lower limit is preferably 5 mm, more preferably 8 mm, from the viewpoint of reducing the blown air speed in order to suppress drafting. The number of ventilation holes 12 formed in the radiation plate 11 is determined by the air volume and the velocity of air that typically passes through the air-conditioned room and the ceiling back through the ventilation holes 12 with respect to the size. The air volume is typically determined from the circulating air volume necessary for keeping the inside of the air-conditioned room 2 at a predetermined cleanliness. The wind speed is typically 0.05 to 0.35 m / s, but the upper limit is preferably 0.3 m / s, more preferably 0 from the viewpoint that a person in the air-conditioned room does not feel a draft. The lower limit is preferably 0.1 m / s, more preferably 0.15 m / s, from the viewpoint of implementing the effect of convection to the air-conditioned room. The shape of the radiation plate 11 may be a square, a triangle, or a polygon other than a rectangle. The shape of the radiating plate 11 may be appropriately selected in consideration of the shape of the air-conditioned room and the relationship with other appliances such as lighting (proneness).

  The heat medium flow path 13 is configured such that one of cold water or hot water as a heat medium flows through the heat medium flow path depending on whether it is cooling or heating, and the radiating plate 11 can receive heat or heat. . Here, “cold water” is water that flows in the heat medium flow path 13 when the air-conditioned room is cooled, and the temperature at the entrance of the radiant panel 10 is typically 15 to 20 ° C., From the viewpoint of improving the cooling efficiency, the upper limit is preferably 19 ° C., more preferably 18 ° C., and from the viewpoint of preventing condensation, the lower limit is preferably 16 ° C., more preferably 17 ° C. The “warm water” is water that flows in the heat medium flow path 13 when the air-conditioned room is heated, and the temperature at the entrance of the radiation panel 10 is typically 28 to 45 ° C. The upper limit is preferably 40 ° C., more preferably 38 ° C. from the viewpoint of energy reduction, and the lower limit is preferably 30 ° C., more preferably 34 ° C., from the viewpoint of improving heating efficiency. In addition, from the viewpoint of heat moving from a high heat source to a low heat source, the expression of receiving cold heat may be uncomfortable, but the quality is lower than the ambient temperature to cool the air-conditioned room 2 In view of the fact that a high level of cold heat is required, the case where the radiation plate 11 is cooled by cold water is expressed as receiving cold heat for convenience.

  The heat medium flow path 13 is attached to the radiation plate 11 in an appropriately bent state. Typically, a copper pipe or a resin pipe is used for the heat medium flow path 13. Other materials may be used, but it is preferable to use a material that is excellent in bending workability and strong in bending. Further, the heat medium flow path 13 can adjust the amount of heat transfer to the radiation plate 11 according to the length attached to the radiation plate 11, and when it is desired to give more heat to the radiation plate 11, the heat medium flow path 13 is bent as small as possible. It is good to bend with a radius and to make more length contact the radiation plate 11. FIG. Moreover, although the heat medium flow path 13 is suitably fixed to the radiation plate 11, in order to be able to absorb expansion and contraction with respect to temperature changes, it is preferable to fix the length direction (axial direction) to a minimum. Thus, the expansion / contraction of the heat medium flow path 13 attached to the radiation plate 11 is absorbed by the curved portion with respect to expansion / contraction accompanying temperature change. Moreover, the heat medium flow path 13 is formed with flexible portions 13a and 13b that facilitate connection to the piping.

The shape of the cross section of the heat medium flow path 13 is a shape that can increase the contact area between the heat medium flow path 13 and the radiation plate 11 from the viewpoint of increasing heat transfer from the heat medium flow path 13 to the radiation plate 11. Have.
Here, the shape of the heat medium flow path 13 will be described with reference to FIG. FIG. 2 is a cross-sectional view of the heat medium flow path 13 attached to the radiant panel 10, (a) shows a cross section of the heat medium flow path according to the present embodiment, and (b) to (d) are modified examples. The cross section of a heat carrier channel is shown. As shown in FIG. 2A, the heat medium flow path 13 typically has a flat cross section. The heat medium flow path 13 having a flat cross section may be manufactured by using a mold having a flat cross section, or once a tube having a circular cross section is manufactured and deformed so that the cross section becomes flat. Good. The flatness ratio of the heat medium flow path 13 may be determined from the viewpoint of thermal stress accompanying expansion and contraction of the heat medium flow path 13 and the flow speed capable of preventing erosion due to the heat medium flowing inside.

  Moreover, as shown in FIG.2 (b), it is good also considering the cross-sectional shape of the heat-medium flow path 13 as a semicircle shape. In this case, the heat medium flow path 13 is attached to the radiation plate 11 so that a portion corresponding to the diameter of the semicircular cross section is in contact with the radiation plate 11. Moreover, as shown in FIG.2 (c), the cross-sectional shape of the heat-medium flow path 13 may be made into a rectangular shape, and may be made into a triangular shape as shown in FIG.2 (d). When the cross-sectional shape is a rectangle or a triangle, the heat medium flow path 13 is attached to the radiation plate 11 so that one side of the rectangle or the triangle is in contact with the radiation plate 11. The heat medium flow path 13 when the cross-sectional shape is a semicircular shape, a rectangular shape, or a triangular shape is typically manufactured using a mold having a semicircular shape, a rectangular shape, or a triangular shape in cross section. . The cross-sectional shape of the heat medium passage 13 may be a polygon such as a pentagon or a hexagon other than the above.

  Compared with the case where the cross-sectional shape is a perfect circle by setting the cross-sectional shape of the heat medium flow channel 13 to be a flat shape, a semicircular shape, a rectangular shape, a triangular shape, or the like, the heat medium flow path 13 and the radiation plate 11 This increases the heat transfer from the heat medium flow path 13 to the radiating plate 11, and as a result, the amount of radiant heat from the radiating plate 11 can be increased. The “perfect circle” here is not a perfect circle in a strict sense, but generally means a circle that is a cross-sectional shape adopted by the piping, and includes those having some distortion. That is, the “perfect circle” referred to here is a cross-sectional shape of a pipe that is intended to have a substantially circular cross section.

  Moreover, when the cross-sectional shape of the heat medium flow path 13 is a flat shape, a semicircular shape, a rectangular shape, a triangular shape, or the like, the heat medium in the heat medium flow path 13 is compared with the case where the cross-sectional shape is a perfect circle. The flow rate is increased, and the heat transfer rate can be improved. If the flow rate of the heat medium in the heat medium flow path 13 having a flat, semicircular, rectangular or triangular cross-sectional shape is the same as the flow rate when the cross-sectional shape is a perfect circle, the cross-sectional flat shape Therefore, the flow rate of the heat medium flowing through the heat medium flow path 13 is reduced, so that the conveyance power of the heat medium is reduced.

  The radiating panel 10 configured as described above is configured to be able to adjust the temperature in the air-conditioned room by radiating heat rays that are electromagnetic waves. The heat rays radiated from the radiating panel 10 are cold during cooling and warm during heating. Cold heat is heat at a temperature lower than the set temperature of the air-conditioned room. The warm heat is heat at a temperature higher than the set temperature of the air-conditioned room. Strictly speaking, as described above, at the time of cooling, cold heat is not radiated from the radiating panel 10, but, for example, heat radiated from a human or the like is reflected by being absorbed by the radiating panel 10 having a low temperature. However, in this specification, for the sake of convenience, it is expressed that cold heat is also radiated. The radiating panel 10 is typically installed on a ceiling surface, a floor surface, or a wall surface, and constitutes an air conditioning system that air-conditions an air-conditioned room.

  FIG. 3 is a system diagram illustrating the air conditioning system 1 according to the embodiment of the present invention. In the air conditioning system 1 according to the present embodiment, a plurality of radiation panels 10 are arranged on the ceiling surface of the air-conditioned room 2, and the radiation panel 10 constitutes the ceiling of the air-conditioned room 2. The air conditioning system 1 also includes a heat source device 61 that adjusts the temperature of cold water (during cooling) or hot water (during heating) supplied to the radiant panel 10. Although not shown, a blower is provided behind the ceiling. The blower causes air to flow through the vent holes 12 of the radiation plate 11.

  As the heat source device 61, a heat pump chiller, a cold / hot water generator, or the like is used. The heat source 61 passes through the radiant panel 10 to introduce cold water whose temperature has increased during cooling and derive cold water whose temperature has decreased, and introduces hot water whose temperature has decreased during heating and derives hot water whose temperature has increased It is configured to be able to. The cold water (hot water) whose temperature is adjusted by the heat source device 61 is led out from the heat medium outlet 61a, and the cold water (hot water) returned from the radiation panel 10 is introduced from the heat medium inlet 61b.

  The heat medium outlet 61 a is connected to the flexible portion 13 a (see FIG. 1) of the heat medium flow path 13 via a pipe 81. The pipe 81 is provided with a water supply pump 62 that pumps cold water (hot water) to the heat medium flow path 13. On the other hand, the heat medium inlet 61 b is connected to the flexible portion 13 b (see FIG. 1) of the heat medium flow path 13 via a pipe 82. Since a plurality of the radiating panels 10 are provided on the ceiling of the air-conditioned room 2 and there are as many flexible portions 13 a and 13 b as the number of the radiating panels 10, typically, the pipe 81 is connected to each other via the supply header 18. It is connected to the flexible part 13 a of the radiating panel 10, and the pipe 82 is connected to the flexible part 13 b of each radiating panel 10 via the letter header 19. In this way, a circulation channel is formed in which cold water (hot water) circulates between the radiating panel 10 and the heat source device 61.

With reference to FIGS. 1 to 3, the operation of the radiating panel 10 and the air conditioning system 1 according to the embodiment of the present invention will be described.
First, the operation during cooling will be described. When the cooling of the air-conditioned room 2 is started, the pump 62 is activated and the circulation of the cold water flowing through the pipes 81 and 82 and the like is started. When the pump 62 is activated, the heat source device 61 is activated. The heat source 61 works by introducing an energy source such as electricity or gas, and sets the temperature of the cold water led out from the heat source 61 to about 17 ° C. The cold water of about 17 ° C. flows into the heat medium flow path 13 of the radiant panel 10 through the pipe 81 and the supply header 18.

  The cold water introduced into the radiant panel 10 flows through the heat medium flow path 13 and reaches the retan header 19. The cold water flowing through the heat medium flow path 13 exchanges heat with the radiation plate 11, the radiation plate 11 is cooled, and the temperature of the cold water rises. At this time, the cross section of the heat medium flow path 13 is flat (see FIG. 3A), and the contact area with the radiation plate 11 is increased as compared with the case where the cross section is circular. Heat exchange with the radiation plate 11 is promoted. Moreover, since the flow rate of the cold water which flows through the inside of the heat medium flow path 13 which has a flat cross section becomes quick compared with the case of a circular cross section, a heat transfer rate improves. On the other hand, when the heat transfer amount from the cold water to the radiation plate 11 is set to the same level as when the cross section of the heat medium flow path 13 is circular, and the flow rate of the cold water flowing through the heat medium flow path 13 is reduced, the pump 62 Power is reduced. Further, the temperature of the cold water flowing through the heat medium passage 13 is about 17 ° C., and the radiation plate 11 does not condense in consideration of the humidity of the air-conditioned room 2. The radiant panel 10 that has received cold from cold water and the temperature of the radiating plate 11 has decreased radiates cold toward the air-conditioned room 2. Since the radiation of the cold heat from the radiation panel 10 is performed from the entire ceiling surface of the air-conditioned room 2, temperature unevenness hardly occurs in the air-conditioned room 2.

  Further, a plurality of vent holes 12 are formed in the radiation plate 11, and the air-conditioned room 2 and the ceiling back (through the radiation panel 10 on the opposite side of the air-conditioned room 2) through the vent hole 12 by a blower (not shown). ), The air moves with a slight wind, so that a minute flow of air is generated in the air-conditioned room 2 and stagnation can be prevented. Further, when the air passes through the vent hole 12, the air cooled by the heat medium flow path 13 provided in the vicinity thereof flows into the air-conditioned room 2 and does not hinder the cooling effect.

  The cold water that has flowed through the heat medium flow path 13 and exchanged heat with the radiation plate 11 flows into the retan header 19. The temperature of the cold water flowing into the letan header 19 is about 19 ° C. The cold water that has flowed into the letter header 19 flows through the pipe 82, flows into the heat source unit 61 from the heat medium inlet 61 b, and the temperature is adjusted by the heat source unit 61. The cold water whose temperature has been lowered by the heat source device 61 is led out from the heat medium outlet 61a, flows through the pipe 81, and is supplied to the radiation panel 10 again.

  Next, the effect | action at the time of heating is demonstrated. When the heating of the air-conditioned room 2 is started, circulation of hot water flowing through the pipes 81, 82, etc. is started by starting the pump 62, and then the heat source unit 61 is started. The temperature of the hot water led out from the heat source device 61 is about 36 ° C. The hot water of about 36 ° C. flows into the heat medium flow path 13 of the radiant panel 10 through the pipe 81 and the supply header 18.

  The hot water introduced into the radiating panel 10 flows through the heat medium flow path 13 and reaches the retan header 19. The hot water flowing through the heat medium flow path 13 exchanges heat with the radiation plate 11, the radiation plate 11 is warmed, and the temperature of the hot water decreases. At this time, the cross section of the heat medium flow path 13 is flat (see FIG. 3A), and the contact area with the radiation plate 11 is increased as compared with the case where the cross section is circular. Heat exchange with the radiation plate 11 is promoted. Moreover, since the flow rate of the hot water which flows through the inside of the heat medium flow path 13 which has a flat cross section becomes quick compared with the case of a circular cross section, a heat transfer rate improves. On the other hand, when the amount of heat transfer from the hot water to the radiation plate 11 is set to the same level as when the cross section of the heat medium flow path 13 is circular, and the flow rate of the hot water flowing through the heat medium flow path 13 is reduced, the power of the pump 62 Is reduced. The radiant panel 10 that has received the heat from the hot water and has raised the temperature of the radiation plate 11 radiates the heat toward the air-conditioned room 2. Since the radiation of the warm heat from the radiation panel 10 is performed from the entire ceiling surface of the air-conditioned room 2, temperature unevenness hardly occurs in the air-conditioned room 2.

  A plurality of vent holes 12 are formed in the radiating plate 11, and the air-conditioned room 2 and the back of the ceiling (the opposite side of the air-conditioned room 2 across the radiating panel 10 through the vent hole 12 by a blower (not shown). ), The air moves with a slight wind, so that a minute flow of air is generated in the air-conditioned room 2 and stagnation can be prevented. Further, when the air passes through the vent hole 12, the air heated by the heat medium flow path 13 provided in the vicinity thereof flows into the air-conditioned room 2 and does not hinder the heating effect.

  The hot water that has flowed through the heat medium flow path 13 and exchanged heat with the radiation plate 11 flows into the retan header 19. The temperature of the hot water flowing into the letan header 19 is about 34 ° C. The hot water that has flowed into the letter header 19 flows through the pipe 82, flows into the heat source unit 61 from the heat medium inlet 61 b, and the temperature is adjusted by the heat source unit 61. The hot water whose temperature has been raised by the heat source device 61 is led out from the heat medium outlet 61a, flows through the pipe 81, and is supplied to the radiation panel 10 again.

  In the above description, it has been described that the vent hole 12 is formed in the radiation plate 11, but the vent hole 12 may not be formed. When the vent hole 12 is not formed, it is not necessary to provide a blower behind the ceiling, and the air conditioning system 2 can be simplified. However, when the ventilation hole 12 is formed in the radiation plate 11 to create a minute air flow, it is possible to prevent stagnation of air in the air-conditioned room.

  In the above description, the heat medium is described as cold water or hot water, but other fluids such as brine and gas may be used. That is, any fluid can be used as long as the heat can be applied to the radiation plate.

  In the above description, the radiating panel 10 has been described as being disposed on the ceiling surface of the air-conditioned room. However, the radiating panel 10 may be provided at two or more locations on the floor surface, wall surface, ceiling, floor, or wall.

It is a perspective view of the radiation panel concerning an embodiment of the invention. It is sectional drawing of the heat medium flow path attached to a radiation panel. (A) shows the cross section of the heat medium flow path which concerns on this Embodiment, (b)-(d) has shown the cross section of the heat medium flow path of a modification. It is a distribution diagram explaining an air-conditioning system concerning an embodiment of the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air conditioning system 2 Air-conditioned room 10 Radiation panel 11 Radiation plate 12 Ventilation hole 13 Heat medium flow path 18 Supply header 19 Letter header 61 Heat source machine 62 Pump 81, 82 Piping

Claims (4)

A heat medium flow path through which the heat medium flows;
A radiation plate that receives heat from the heat medium flowing through the heat medium flow path and radiates the heat;
The heat medium flow path has a cross-sectional shape such that the contact area between the heat medium flow path and the radiation plate is larger than when the cross-sectional shape of the heat medium flow path is assumed to be a perfect circle;
Radiant panel. The cross-sectional shape of the heat medium flow path is formed into a flat shape, a semicircular shape, a rectangular shape, or a triangular shape;
The radiation panel according to claim 1. Vent holes were formed in the radiation plate;
The radiation panel according to claim 1 or 2. The radiation panel according to any one of claims 1 to 3 is disposed in at least one of a ceiling surface, a floor surface, and a wall surface of the air-conditioned room;
Cold water is allowed to flow through the heat medium flow path when the air-conditioned room is cooled, and hot water is allowed to flow through the heat medium flow path when the air-conditioned room is heated;
Air conditioning system.

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