JPH05203199A - Radiation air conditioner - Google Patents

Abstract

PURPOSE:To output capacity of a radiation air conditioner as compared with conventional radiation air conditioner as a result of preventing dew-condensation on a surface of a cooling member even if a temperature of a radiator is lowered as compared with a dew point temperature of an area to be conditioned when room cooling is conducted by using the radiation air conditioner. CONSTITUTION:An upper part and a periphery of a cooling plate 1 for air conditioning an area to be conditioned are surrounded by a heat insulator 5, and an infrared ray transmission film such as a polyethylene film, etc., is used as a surface member 3. An air layer 4 in which steam concentration is reduced is sealed in a gap between the plate 1 and the member 3. The member 3 for transmitting an infrared ray is provided on the radiator having a cooling surface lower than a temperature of the area to be conditioned through the layer containing lower steam concentration thereby to prevent dew-condensation without precise control of a humidity of the area to be conditioned and a temperature of a radiation surface, and hence a radiation air conditioner having a low cost and high performance is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiant air conditioner for cooling an air conditioning target area.

[0002]

2. Description of the Related Art Generally, air conditioning uses a convection method.
It is general to provide cooled air during cooling. On the other hand, when the air-conditioning target area is cooled by radiation, it is possible to directly cool a person or a wall surface.

However, since the transfer of heat by radiation is small, it is necessary to increase the area of the cooling surface or lower the temperature of the cooling surface in order to obtain an effective cooling capacity.

Here, when the method of lowering the temperature of the cooling surface is adopted, if the temperature of the radiation surface is lower than the dew point temperature of the area to be air-conditioned on the radiation surface, the radiation surface will condense. The preventive measures are needed.

Conventionally, in order to meet such a demand,
There is a method to remove condensed water due to condensed water. As the method, first, a radiation cooling device as shown in FIGS. 5 and 6 has been proposed. This method will be referred to as the first method later. This FIG. 5 and FIG. 6 are actual Kaihei 3-61227.
FIG. 5A and FIG. 5A of the radiant cooling apparatus disclosed in Japanese Patent Publication No.
It is an arrow view. In both figures, 1 is a cooling plate, 2 is a refrigerant pipe, 5 is a heat insulating material, and a drain receiver 8 is arranged below the cooling plate 1. Condensed water 12 is condensed water, which is dropped from the upper part of the ridge 9 to the drain receiver 8 below it.
It is discharged through the 0 drainage channel.

Another radiation cooling device shown in FIG. 7 has been proposed. This method will be called the second method later. This is the radiant cooling device disclosed in Japanese Patent Publication No. 3-6425. A radiation panel unit 13 is composed of a combination of a large number of electronic cooling elements 14 and a drain pan 15 provided therebelow. In addition, the electronic cooling element 14
An evaporating dish 16 is provided on the upper part of the so as to have a heat receiving relationship. Then, the drain is sent from the drain pan 15 to the evaporation tray 16 by the pump 17 and the transfer pipe 18, and the heat generated by the electronic cooling element 14 is used to evaporate the drain.

As another method, a radiation cooling device as shown in FIG. 8 has been proposed. This method will be called the third method later. This is a circuit diagram of the radiation cooling device disclosed in Japanese Patent Laid-Open No. 2-146452. In FIG.
A radiant heat exchanger 26 is attached to a refrigeration cycle including a compressor 21, a condenser 22, a pressure reducing device 23, and an evaporator 24. Further, the expansion device 25 is provided at the entrance thereof, and the amount of the refrigerant to the radiant heat exchanger 26 is adjusted thereby. The adjustment is performed so that the evaporation temperature of the radiant heat exchanger 26 becomes equal to or higher than the dew point temperature of the ambient air during the cooling operation.
It is done by controlling the aperture of the.

[0008]

In the radiant cooling apparatus constructed based on the first and second methods described above, a large amount of condensed water due to dew condensation is generated when the humidity in the area to be air-conditioned becomes extremely high. Occurs and processing becomes difficult. In the first method, dew condensation occurs on the lower surface of the drain receiver, and the condensed water drops inside the device, impairing the effectiveness of this cooling system. Further, in the radiant cooling apparatus configured based on the third method, it is necessary to perform precise measurement of the evaporation temperature of the radiant heat exchanger to control the amount of refrigerant to the radiant heat exchanger,
In an actual living space, such a thing is extremely difficult. As described above, the conventional methods do not provide a fundamental and realistic solution to the problem of dew condensation that occurs when performing cooling.

The present invention has been made in order to solve such a problem, and when cooling by radiant air conditioning, dew condensation is performed without precise control of humidity and radiation surface temperature of an air conditioning target area. The present invention provides an air conditioner capable of preventing the above.

[0010]

A radiant air conditioner according to the present invention is a radiant air conditioner having a cooling surface having a temperature lower than an area to be conditioned, a surface which transmits infrared rays through an air layer having a low water vapor concentration. It is configured by providing members.

Further, the radiation air conditioner is provided with a radiator and a surface member, and an infrared permeable gas is sealed in a gap between the radiator and the surface member.

[0012]

In the radiation air conditioner according to the present invention, infrared rays emitted from the object to be cooled are transmitted through the surface member and absorbed by the cooling surface.
Moreover, since the cooling surface does not directly touch the air in the air conditioning target area,
Condensation can be prevented even if the cooling surface is below the dew point temperature.

[0013]

【Example】

 Example 1. Examples of the present invention will be described below.

FIG. 1 is a sectional view of a radiant air conditioner body showing an embodiment of the present invention. Reference numeral 1 is a cooling plate for cooling the air conditioning target area, 2 is a refrigerant pipe through which a cooling / heating medium for cooling the cooling plate 1 flows, and the radiation having a cooling surface lower than the air conditioning target area temperature by the cooling plate 1 and the refrigerant pipe 2 Make up the body. Three
Is a surface member and is made of an infrared ray transmitting film such as a polyethylene film. Reference numeral 4 is an air layer having a low water vapor concentration enclosed in the gap between the radiator and the surface member 3. 5 is 1
Is a heat insulating material that surrounds the upper part and the peripheral part of the. Reference numeral 6 is an infrared absorbing paint applied to the surfaces of the cooling plate 1 and the refrigerant pipe 2.

Next, the operation of the first embodiment will be described with reference to FIGS.

FIG. 2 is a schematic diagram showing the heat transfer of the radiant air conditioner according to the present invention. In the figure, a is the amount of radiant heat that is transmitted from the outside through the surface member 3 and is absorbed by the cooling plate 1, b
Is the amount of heat that the surface member 3 obtains from the outside by radiation and convection, and c is the amount of heat that is transferred from the surface member 3 to the cooling plate 1 by radiation, convection, and conduction.

By adopting such a structure, a large cooling capacity can be obtained without causing dew condensation on the radiator and the surface member which is the infrared ray transmitting film. This will be described in more detail in the relationship diagram of the surface temperature between the radiator and the infrared transmitting film shown in FIG.

As shown in the figure, the thickness of the air layer is 0.02.
FIG. 3 shows a characteristic diagram in which the temperature of the film is calculated with respect to the temperature of the cooling surface when m, the height is 1.0 m, and the air temperature in the air conditioning target region is 28 ° C. The infrared transmittance of the film is 0.8,
The absorptance was 0.1, the reflectance was 0.1, and the emissivity of the cooling surface was 0.9.

If the relative humidity of the air temperature in the air-conditioned area is 60%, the dew point temperature is about 19.2.
Since it is ° C, the temperature of the radiator is about 5.8 ° C from Fig. 3.
It is possible to lower That is, if the temperature of the cooling plate 1 is 5.8 ° C or higher, the temperature of the surface member 3 is 19.2 °.
Since it is C or more, no dew condensation is formed on the surface of the surface member 3.
Further, since an air layer having a reduced water vapor concentration is enclosed in the gap between the cooling plate 1 and the surface member 3, no dew condensation is formed on the cooling plate 1 either.

Although the panel type radiation air conditioner is shown, it goes without saying that other shapes such as a cylindrical system may be used.

Further, the shape of the cooling plate and the cooling method,
The material of the surface member and the like are not limited to the conditions of the first embodiment.

Example 2. In the above embodiment, the cooling plate 1
Although an example in which an air layer having a low water vapor concentration is enclosed in the gap between the surface member 3 and the surface member 3 is shown, the same effect can be obtained by enclosing an infrared permeable gas in this gap.

Example 3. FIG. 4 is a sectional view showing a radiation air conditioner according to another embodiment of the present invention, in which a desiccant 7 is put on both sides of the enclosed air layer 4.

[0024]

As described above, according to the present invention, the radiator having the cooling surface lower than the temperature of the air-conditioning target area is provided with the surface member which transmits infrared rays through the air layer having a low water vapor concentration. Therefore, since it is possible to prevent dew condensation without precisely controlling the humidity and the radiation surface temperature of the area to be air-conditioned, there is an effect that an inexpensive and high-performance radiation air conditioner can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a radiation air conditioner according to the present invention.

FIG. 2 is a configuration diagram schematically showing heat transfer of the radiant air conditioner according to the present invention.

FIG. 3 is a diagram showing a relationship between a radiator temperature and an infrared transparent film temperature of the radiation air conditioner according to the present invention.

FIG. 4 is a cross-sectional view of another embodiment of the radiation air conditioner according to the present invention.

FIG. 5 is a perspective view of a conventional radiant cooling apparatus.

6 is a view on arrow A of FIG.

FIG. 7 is a sectional view of a main part of another conventional radiant cooling apparatus.

FIG. 8 is a circuit diagram of a third conventional radiant cooling apparatus.

[Explanation of symbols]

1 Cooling Plate 2 Refrigerant Pipe 3 Surface Member (Infrared Transmission Film) 4 Air Layer with Reduced Water Vapor Concentration The cooling plate 1 and the refrigerant pipe 2 constitute a radiator.

Claims (2)

[Claims] 1. A radiant air conditioner for cooling by means of a radiator, comprising a radiator for cooling the radiator and a surface member that transmits infrared rays, so that dew condensation does not occur in the gap between the radiator and the surface member. A radiant air conditioner characterized by being provided with an air layer having a low water vapor concentration. 2. A radiant air conditioner comprising a radiator and a surface member, wherein an infrared permeable gas is sealed in a gap between the radiator and the surface member.