JPH10205833A - Radiation type air conditioning equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide radiation type air conditioning equipment which can obtain a desired cooling capacity preventing dew condensation on a radiation surface in the cooling operation and a desired heating capacity by reducing transmission loss of radiation energy in the heating operation. SOLUTION: In the cooling operation, a part having no opening part of an infrared transmissible film 33 is made to face a radiation surface 30a while a low moisture air layer 36 is formed between the radiation surface 33a and the infrared transmission film 33 to prevent dew condensation on the radiation surface 30a. At this point, radiation energy transmits through the infrared transmission film 33 accompanying a slight loss but the prevention of the possible dew condensation allows cooling with the temperature of the radiation surface 30a lowered below the dew point as compared with the absence of the infrared transmission film 33. In the heating operation, a part having an opening part of the infrared transmissible film 33 is made to face the radiation surface 30a to reduce transmission loss of the radiation energy attributed to the infrared transmissible film 33.

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 performing radiant cooling and heating.

[0002]

2. Description of the Related Art In recent years, a radiant air conditioner has been developed as an air conditioner which replaces a conventional convective air conditioner, in which cooling or heating is performed by a radiant panel disposed on a ceiling or the like of a room to be air-conditioned. ing. In this radiant air conditioner, when the radiant panel is cooled, heat rays from the human body and the like are absorbed by the radiant panel to perform cooling, and when the radiant panel is heated, heat rays from the radiant panel are applied to the human body and the like. Heat is absorbed and absorbed.

[0003] Such cooling or heating of the radiant panel is generally performed by a refrigerant pipe disposed in the radiant panel, or by circulating cool air or hot air in the radiant panel. . And since the said radiation type air conditioner does not involve the noise, stirring, etc. by a ventilation fan, comfortable cooling and heating can be implement | achieved.

[0004] Incidentally, in the radiation type air conditioner, there is a problem that condensation occurs on the radiation surface during cooling operation in summer or the like when the humidity is relatively high. This is because the temperature of the radiation surface drops below the dew point temperature, and moisture in the room air supplied by convection condenses. In addition, such dew condensation on the radiation surface may cause carpets and furniture to be stained by dripping, and may cause propagation of various bacteria on the radiation surface. Therefore, it is necessary to prevent such dew condensation. But,
In order to prevent condensation, the temperature of the radiating surface must be higher than the dew point temperature.In practice, the cooling capacity must be reduced, and this will not provide a sufficient cooling effect. Did not.

Conventionally, in order to solve such a problem during the cooling operation, an infrared transmitting film is disposed on the indoor side, which is the front of the radiation surface of the radiation panel, and a space between the infrared transmitting film and the radiation surface. Air conditioning that performs desired cooling by absorbing heat rays from the human body and the like into the radiant panel through the infrared transmitting film while preventing dew condensation on the dew surface by keeping the air above the dew point temperature. An apparatus is proposed.

[0006]

However, in the radiant air conditioner thus configured, there is no fear of dew formation on the radiation surface during the heating operation.
The infrared transmitting film is not required for preventing dew condensation and dropping, and there is a problem that the presence of the infrared transmitting film hinders the transmission of heat rays from the radiant panel and lowers the heating capacity.

Therefore, the present invention has been made in view of the above situation, and it is possible to obtain a desired cooling capacity while preventing dew condensation on a radiation surface during a cooling operation, and to obtain a radiant energy during a heating operation. It is an object of the present invention to provide a radiant air conditioner capable of obtaining a desired heating capacity by reducing a transmission loss of the radiant air conditioner.

[0008]

According to the first aspect of the present invention, there is provided a radiation type air conditioner for cooling or heating a room by heat radiation from a radiation surface of a radiation panel. A movable infrared transmitting film is provided forward, and the infrared transmitting film is retracted from the front of the radiation surface during a heating operation.

According to the second aspect of the present invention, a movable infrared transmitting film is provided in front of the radiation surface of the radiation panel, and a prediction means for predicting the occurrence of dew condensation on the radiation surface is provided. When the occurrence of condensation is not predicted by the means, the infrared transmitting film is retracted from the front of the radiation surface.

[0010] According to the third aspect of the present invention, the first aspect is provided.
Or a low humidity air layer is formed between the radiation surface and the infrared transmitting film.

According to these inventions, during the cooling operation, the infrared permeable film is provided in front of the radiation surface of the radiation panel, so that dew condensation on the radiation surface is prevented. At this time, radiant energy is transmitted by the infrared transmitting film with some loss, but cooling can be performed to lower the radiation surface temperature below the dew point temperature in the absence of the infrared transmitting film, so that a desired cooling capacity is obtained. Can be

In the heating operation, the infrared transmitting film is retracted from the front of the radiating surface of the radiating panel, so that the transmission loss of the radiant energy by the infrared transmitting film is reduced, and a desired heating capacity is obtained. Can be

In particular, according to the second aspect of the invention, when the occurrence of dew is not predicted by the prediction means, the infrared transmitting film is retracted from the front of the radiation surface of the radiation panel. Even in the case where there is no fear of dew condensation, the radiation surface of the radiation panel is exposed to the conditioned room, and in that case, the transmission loss of the radiation energy by the infrared transmitting film is reduced.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, the radiation type air conditioner generally includes an indoor unit 2 disposed on a ceiling of a building 1, an outdoor unit 3 disposed outdoors, and a remote control (remote) disposed on a wall surface in the room. Controller) 4
And so on. The indoor unit 2 includes an evaporator 6, a heat exchanger 7, an electric fan 8, and the like, which are arranged in the ceiling back 1a, in addition to a hollow radiation box 5 forming a ceiling surface.

FIG. 2 is a diagram showing a refrigerant circuit and an electric circuit. In the refrigerant circuit of the indoor unit 2, in addition to the radiant panel 30, the evaporator 6, and the heat exchanger 7, the first and second three-way valves V1, V2, the second and third electronic expansion valves MV2, The MV 3 and the check valves 12 and 13 are provided. A refrigerant pipe 15, a heat exchanger 7, a second electronic expansion valve MV2, a check valve 12, and a refrigerant pipe 16 are provided between the first three-way valve V1 and the radiant panel 30, and these are further bypassed. A refrigerant pipe 14 (first bypass circuit) is provided. In addition, between the radiant panel 30 and the second three-way valve V2, the refrigerant pipe 17, the third electronic expansion valve MV3, the evaporator 6,
A check valve 13 and a refrigerant pipe 18 are provided, and a refrigerant pipe 19 (second bypass circuit) for bypassing these is provided.

The refrigerant circuit of the outdoor unit 3 includes a compressor 2
0, four-way valve 21, condenser 22, first electronic expansion valve MV1
Are arranged. The equipment of both refrigerant circuits is connected by the above-mentioned refrigerant pipes 14 to 19 and the other refrigerant pipes 23 to 27, and a gas refrigerant or a liquid refrigerant circulates through each equipment.

The indoor unit 2 is provided with an indoor ECU (electronic control unit) 28 as control means, and the outdoor unit 3 is provided with an outdoor ECU 29. Both E
The CUs 28 and 29 are composed of various components such as an input / output interface, a ROM and a RAM, in addition to the CPU which is the control center.

The indoor ECU 28 is provided with a control program, the remote controller 4, a temperature sensor S1 for detecting the surface temperature of the radiation panel 30, a temperature sensor S2 provided near the radiation panel 30, a humidity sensor S3, and the like. Based on the input signal, the electric fan 8 and the second and third electronic expansion valves M
V2, MV3, first and second three-way valves V1, V2, evaporator 6, heat exchanger 7, etc., and an electromagnetic damper 11 to be described later.
(FIG. 1), drive control of the first and second motors M1 and M2. In addition, the indoor ECU 28 calculates the dew point temperature of the radiation panel 30 according to the temperature sensor S2 and the humidity sensor S3, compares the calculated value with the temperature sensor S1, and calculates the dew point on the radiation surface 30a of the radiation panel 30. Prediction means for predicting the occurrence (whether or not there is fear of occurrence) is built in, and based on the prediction result by the prediction means, as will be described later in detail, the electric fan 8 and the first and second motors M1, M1 Drive control of M2.

The outdoor ECU 29 drives and controls the compressor 20, the four-way valve 21, the condenser 22, and the first electronic expansion valve MV1 based on control programs and input signals from various sensors (not shown). Note that both ECUs 28 and 29
Are connected to each other by a signal line, and are configured to exchange signals with each other.

As shown in FIG. 3, inside the radiation box 5, a radiation panel 30 is disposed at an upper portion thereof. In the radiation panel 30, a refrigerant pipe 9 is provided. The refrigerant pipe 9 is connected in a series in a meandering manner. As shown in FIG. 2, one end 9a is connected to the refrigerant pipe 14, and the other end 9b is connected to the refrigerant pipe. Connected to tube 19. When, for example, heat absorption is performed in the refrigerant pipe 9, radiant cooling is performed through the radiation surface 30a of the radiant panel 30, while, for example, when heating is performed in the refrigerant pipe 9, radiant heating is performed through the radiation surface 30a. It is configured to be

As shown in FIG. 3, an opening 5a communicating between the inside of the radiation box 5 and the room is formed in the lower part of the radiation box 5, and the opening 5a
3 are arranged. The infrared transmitting film 33 is stretched between take-up rollers 34 and 35 disposed at lower corners of the radiation box 5.

As shown in FIG. 2, one take-up roller 34 is provided with a first motor M provided outside the radiation box 5.
1 output shaft, and the other take-up roller 35
A second motor M2 also arranged outside the radiation box 5
Output shaft. In addition, these 1st, 2nd
Motors M1 and M2 can be arranged inside the radiation box 5.

The infrared transmitting film 33 is developed as shown in FIG. 4 and is composed of a portion 33A in which openings 33a, 33a are formed and another portion (a portion in which the opening 33a is not formed) 33B. ing. And each part 3
The lengths L1 and L2 of the openings 3a and 33B are respectively equal to the openings 5a.
It is almost the same length as, or slightly longer,
When the portion 33A covers the opening 5a, the portion 33B
When the portion 33B covers the opening 5a, the portion 33A is taken up by the take-up roller 34.

Referring to FIG. 3, a space 36 formed between radiating panel 30 and infrared transmitting film 33 includes
Air is supplied through the supply duct 31, and the air is discharged through the return duct 32. This air is
As shown in FIG. 1, the air is circulated and supplied through the electric fan 8. As shown in FIG. 1, an air outlet 10 a for communicating the inside of the supply duct 31 with the room is formed on the ceiling plate 10 on the downstream side of the heat exchanger 7.
An electromagnetic damper 11 is provided at the air outlet 10a.

Next, the operation of the radiant air conditioner will be described.

(1) In consideration of the fact that the room is usually warm when the cooling operation starts, the electric fan 8 is driven to forcibly blow air to rapidly cool the room by forced convection.

At this time, the heat exchanger 7, the radiation panel 30
Then, a depressurized refrigerant is caused to flow through the evaporator 6, and the three members are used as coolers. That is, the four-way valve 21 is switched to the position indicated by the solid line, and a and b of the first three-way valve V1 and the second three-way valve V
The first and second electronic expansion valves MV2 and MV3 are fully opened while the first and second electronic expansion valves MV1 and MV3 are throttled. At this time, as shown in FIG. 1, the damper 11 is erected, and the inside of the supply duct 31 and the room are communicated with each other through the air outlet 10a.

The gas refrigerant is sucked into the compressor 20 from the refrigerant pipe 23 and the four-way valve 21, is heated to a high temperature and a high pressure by adiabatic compression, is discharged from the compressor 20, and passes through the refrigerant pipe 25 and the four-way valve 21 to the condenser. 22. The high-temperature and high-pressure gas refrigerant is cooled while passing through the condenser 22, and is condensed to become a liquid refrigerant. This liquid refrigerant is decompressed by passing through the first electronic expansion valve MV1 via the refrigerant pipe 26, and this decompressed liquid refrigerant passes through the service valve V4, the refrigerant pipe 27, and the first three-way valve V1, The liquid that flows into the refrigerant pipe 9 in the radiant panel 30 via the refrigerant pipe 15, the heat exchanger 7, the second electronic expansion valve MV2, the check valve 12, and the refrigerant pipe 16 and flows out of the refrigerant pipe 9 The refrigerant is a refrigerant pipe 1
7. The gas flows into the evaporator 6 via the third electronic expansion valve MV3.

Since all of the heat exchanger 7, the radiation panel 30, and the evaporator 6 function as an evaporator, the liquid refrigerant passing through them evaporates into gas refrigerant while passing through them, and is electrically driven by vaporization latent heat. The air blown by the fan 8 is cooled.

The cooling air is forcibly supplied into the room through the air outlet 10a and the openings 33a, 33a, and the room is cooled by forced convection. The gas refrigerant from the evaporator 6 is supplied to the check valve 13, the refrigerant pipe 18, the second three-way valve V2, the service valve V5, the refrigerant pipe 23, and the four-way valve 2.
1. Return to the compressor 20 again via the refrigerant pipe 24.

According to this embodiment, at this time, the portion 33B of the infrared transmitting film 33 (FIG. 4) is
5, the opening 5a of the radiation box 5
Is covered by the portion 33A. Therefore, the space 36 of the radiation box 5 and the room are communicated by the opening 33a.

During the cooling operation, the temperature sensor S1, the temperature sensor S2 and the humidity sensor S3 are constantly monitored, and the dew point of the radiation panel 30 is determined based on the values detected by the temperature sensor S2 and the humidity sensor S3. The temperature is calculated.

If the occurrence of dew condensation on the radiation surface 30a of the radiation panel 30 is predicted, the radiation box 5
To cover the opening 5a of the infrared transmitting film 33.
A (FIG. 4) is taken up by the take-up roller 34,
The opening 5a of the radiation box 5 is covered by a portion 33B of the infrared transmitting film 33.

(2) After the start-up control of the cooling operation is performed, when the room temperature reaches a predetermined temperature, the first electronic expansion valve MV1 is throttled, and the first three-way valve V1, a and c, and the second A and C of the three-way valve V2 are communicated, and a first bypass circuit by the refrigerant pipe 14 and a second bypass circuit by the refrigerant pipe 19 are selected.

Then, the refrigerant flows from the first three-way valve V1 through the refrigerant pipe 14 into the refrigerant pipe 9 in the radiation panel 30. At this time, heat is absorbed, and the radiation cooling by the radiation panel 30 is performed. . The refrigerant flowing out of the refrigerant pipe 9 is
The refrigerant reaches the third electronic expansion valve MV3 via the refrigerant pipe 19.
At this time, since the driving of the electric fan 8 is stopped, there is no agitation of air by the electric fan 8, and a comfortable environment is formed. At this time, the damper 11 is tilted down and the supply side duct 31
Communication between the inside and the room is cut off.

According to this embodiment, at this time, the portion 33B of the infrared transmitting film 33 (FIG. 4) is
5, the opening 5a of the radiation box 5
Is covered by the portion 33A. Therefore, since the space 36 of the radiation box 5 and the room are communicated with each other by the openings 33a, 33a, there is almost no obstructive infrared transmitting film, so that the radiation cooling by the radiation panel 30 is efficiently performed.

During the cooling operation, the temperature sensor S1, the temperature sensor S2 and the humidity sensor S3 are constantly monitored, and the dew point temperature of the radiation panel 30 is determined based on the values detected by the temperature sensor S2 and the humidity sensor S3. Is calculated.

(3) If the occurrence of dew condensation on the radiation surface 30a of the radiation panel 30 is predicted, the radiation panel 3
In order to prevent dew condensation on the radiating surface 30a of the first and second motors M, the first and second motors M are used to cover the opening 5a of the radiating box 5.
1 and M2 are controlled to rotate in the same direction, and the infrared transmitting film 3
The third portion 33A (FIG. 4) is taken up by the take-up roller 34, and the opening 5a of the radiation box 5 is completely covered by the portion 33B of the infrared transmitting film 33.

Next, low humidity air is supplied to the space 36 (FIG. 3) of the radiation box 5. That is, while the first electronic expansion valve MV1 is fully opened, the second and third electronic expansion valves MV1
2, MV3 is throttled to communicate a, b of the first three-way valve V1 and A, B of the second three-way valve V2. Further, the electric fan 8 is driven. The electromagnetic damper 11 remains down,
The communication between the inside of the supply side duct 31 and the room is continuously interrupted.

Then, the refrigerant is supplied to the compressor 20, the four-way valve 2
1, the condenser 22, the first electronic expansion valve MV1, and the first three-way valve V1.
The heat is dissipated. The radiated refrigerant is reduced in pressure by the second electronic expansion valve MV2.
After passing through the refrigerant pipe 9 in the radiant panel 30, the pressure is further reduced to a dehumidifying evaporation temperature by the third electronic expansion valve MV3 and flows into the evaporator 6, where heat is absorbed by the evaporator 6,
The refrigerant having absorbed the heat returns to the compressor 20 via the second three-way valve V2 and the four-way valve 21. At this time, the heat exchanger 7
Functions as a heating means, while the radiation panel 30 and the evaporator 6 function as an evaporator, so that the air blown by the electric fan 8 is cooled and dehumidified by the evaporator 6, and the cooled and dehumidified air is Then, the air is heated by the heat exchanger 7 to become dehumidified / reheated air and supplied to the space 36 in the radiation box 30, where a low humidity air layer is formed. As shown in FIG. 3, the low-humidity air layer 36
Flows along the radiation surface 30a, thereby preventing the occurrence of dew condensation on the radiation surface 30a.

Then, the air in the low humidity air layer 36 is returned to the electric fan 8 (FIG. 1) via the return duct 32. Note that the opening degree of the third electronic expansion valve MV3 and the compressor 2
The number of rotations of 0 is adjusted while monitoring the temperature of the dehumidifying / reheating air to be an appropriate temperature and the suction pressure of the compressor 20 to be an appropriate pressure.

(4) During the heating operation in winter or the like, the four-way valve 2
1 is switched as shown by the dotted line, and A and C of the second three-way valve V2 and a and c of the first three-way valve V1 are communicated.
The second bypass circuit by the refrigerant pipe 19 and the first bypass circuit by the refrigerant pipe 14 are selected, and the refrigerant is supplied to the radiation panel 3.
By flowing only to 0, radiant heating by the radiant panel 30 is performed. The electromagnetic damper 11 remains down, and communication between the inside of the supply-side duct 31 and the room is continuously interrupted.

At this time, the driving of the electric fan 8 is stopped, and the first and second motors M1 and M2 are driven.
Then, the portion 33B (FIG. 4) of the infrared transmitting film 33 is wound by the winding roller 35, and the opening 5a of the radiation box 5 is covered by the portion 33A. Therefore,
The space 36 of the radiation box 5 and the room are connected to the openings 33a, 3a.
3a. Thus, during heating, the space 36 and the room are in communication with each other through the openings 33a, 33a, and there is almost no obstructive infrared transmitting film 33. Therefore, the transmission loss of radiant energy by the infrared transmitting film 33 is reduced. In addition, the radiation heating by the radiation panel 30 is efficiently performed.

FIGS. 5 to 7 show experimental results when the infrared transmitting film 33 is used. The infrared transmitting film 33 has a thickness of 1
A polyethylene membrane having a thickness of 00 μm and a transmittance of about 0.7 is used. Referring to FIG. 5, a solid line indicates a case where infrared ray transmitting film 33 is provided and low humidity air layer 36 is formed, and a dotted line indicates a case where infrared ray transmitting film 33 is not provided. FIG.
It can be seen from the graph that the radiation capability (radiation heat) decreases when the infrared transmitting film 33 is provided (solid line) at the same radiation surface temperature.

FIG. 6 shows the relationship between the radiation surface temperature and the infrared transmitting film surface temperature during the cooling operation at an ambient temperature of 27 ° C. The solid line has the infrared transmitting film 33,
The case where the low humidity air layer 36 is formed is shown. If the infrared transmitting film 33 is not provided, the surface temperature of the infrared transmitting film cannot be measured. However, for comparison, the radiation surface temperature at which dew condensation occurs is plotted by a dotted line. Here, in order to obtain the air conditioning capacity during the cooling operation, it is necessary to keep the radiation surface temperature as low as possible. However, if the temperature is too low, there is a risk that surface condensation may occur.

In FIG. 6, the dew point temperature is, for example, 17 ° C., and the surface temperature of the infrared transmitting film is set to 19 ° C. with a margin for safety.
If the temperature does not decrease below, the radiation surface temperature can be lowered to 10 ° C. when the infrared ray transmitting film is provided and the low humidity air layer 36 is formed (solid line).
In the case where there is no infrared transmitting film (shown by a dotted line), the temperature can be lowered only to 19 ° C. as a matter of course. In FIG. 5, when comparing the amount of radiation treatment heat under these conditions, when the infrared ray transmitting film 33 is provided, the difference between the ambient temperature and the radiation surface temperature is (27 ° C.-10 ° C.) = 17 ° C. Therefore, the amount of radiation heat treatment is about 65 W / m2, and when there is no infrared transmitting film 33, the difference between the ambient temperature and the radiation surface temperature is (27 ° C-19 ° C) = 8 ° C. The amount of radiation heat treatment is about 40 W / m 2,
And the low humidity air layer 36 is formed,
The amount of radiation heat treatment can be increased.

As described above, during the cooling operation, by using the infrared transmitting film 33 and forming the low humidity air layer 36, it is possible to increase the amount of radiant heat treatment per unit area while preventing dew condensation. As shown in FIG. 5, at the same radiation surface temperature, although there is some transmission loss of radiation energy, the radiation type air conditioner with a limited installation area is very effective in obtaining the required amount of processing heat. .

FIG. 7 shows the relationship between the difference between the radiation surface temperature and the ambient temperature and the radiation heat quantity at this time, based on experimental results during a heating operation at an ambient temperature of 23 ° C. The solid line indicates the case where the infrared transmitting film 33 is provided, and the dotted line indicates the case where the infrared transmitting film 33 is not provided. As in the case of the cooling operation, it can be seen that the radiation ability (radiation heat) decreases when the infrared permeable film 33 is present (solid line) at the same radiation surface temperature.

In FIG. 7, 100
At W / m 2, the difference between the radiation surface temperature and the ambient temperature is 26 ° C. when the infrared transmitting film 33 is provided,
Is 19 ° C. if no. Since the ambient temperature is 23 ° C., the radiation surface temperature is calculated by adding 23 ° C. to each of the above values, and 49 ° C. when the infrared transmitting film 33 is provided.
When there is no infrared transmission film 33, the temperature is 42 ° C.

As described above, during the heating operation, the infrared transmitting film 33 only causes a transmission loss of the radiant energy. With the infrared transmitting film 33, it is more necessary to obtain the same radiation heat treatment amount. A high radiation surface temperature is required.

That is, in this embodiment, the infrared permeable film is opposed to the radiation surface 30a during the cooling operation, and the low humidity air layer 36 is formed between the infrared permeable film and the radiation surface 30a. In addition, it is possible to prevent the occurrence of dew condensation on the radiation surface 30a and to obtain a desired cooling capacity. Further, since the infrared transmission film is not substantially opposed to the radiation surface 30a during heating, transmission loss of radiation energy by the infrared transmission film can be reduced, and desired heating performance can be obtained.

In this embodiment, since the system for winding the infrared transmitting film 33 is adopted, the infrared transmitting film 3
3 can be reduced in space. Further, in the present embodiment, whether or not there is fear of occurrence of dew condensation is predicted,
Only when there is fear of dew condensation, the infrared permeable film is opposed to the radiation surface 30a and the low humidity air layer 36 is formed. Therefore, the radiation energy of the infrared permeable film during cooling without fear of dew condensation is formed. Transmission loss can be reduced.

FIG. 8 is a developed plan view showing another embodiment of the infrared transmitting film provided in the radiation box 5. This infrared transmitting film 38 is cut out of the infrared transmitting film 38 in consideration of the design when viewed from the room, and a large number of openings 3 are formed.
It is composed of a portion 38A in which 8a is formed, and another portion (a portion in which the opening 38a is not formed) 38B. Then, the length L in the winding direction of the portions 38A and 38B
1 and L2 are the infrared transmitting films 33 (FIG. 4), respectively.
Is the same as Even with such a configuration, the same effect as that of the previous embodiment can be expected. However, when the portion 38A is selectively opposed to the radiation surface 30a, the opening is larger than that of the portion 33A of the previous embodiment. Since the area is small, the transmission loss of the radiant energy is greater than in the previous embodiment.

As described above, the present invention has been specifically described based on the embodiments. However, the present invention is not limited to the above embodiments, and it is needless to say that various modifications can be made without departing from the gist of the present invention. Absent. For example, in the above embodiment, the infrared transmitting film is a thin film of polyethylene, but is not limited to this. For example, a thin film of nylon or the like or a thin film containing any of these as a main component may be used. Any film may be used as long as it transmits infrared light. In particular, the film thickness is more preferably 0.5 mm or less in order to improve the transmission of infrared rays. In the above-described embodiment, the low-humidity air layer is formed by generating the low-humidity air by the refrigeration circuit and supplying the low-humidity air to the space 36.
To form a low-humidity air layer. However, in this case, periodic maintenance is required for the hygroscopic material.

The shape and number of the openings of the infrared transmitting film are not limited to those shown in FIGS. 4 and 8, and other shapes and numbers can be adopted. Further, in the above embodiment, it is more preferable to predict whether or not there is a fear of occurrence of dew condensation during the cooling operation, and only when there is a fear of occurrence of dew condensation, make the infrared permeable film face the radiation surface 30a and use low humidity air. The layer 36 is formed to reduce the transmission loss of radiant energy by the infrared permeable film during the cooling operation in which there is no fear of dew condensation.However, without providing the prediction means for performing the above prediction, the cooling operation is always performed. Alternatively, the low-humidity air layer 36 may be formed while the infrared transmitting film is opposed to the radiation surface 30a. Further, in the above embodiment, the infrared transmitting film is moved by the two motors M1 and M2, but the moving means of the infrared transmitting film is not limited to this.
The winding rollers 34 and 35 are individually attached to the motor output shaft.
One is fixed, the other is fixed to the rotating shaft, the rotating shaft is rotatably supported, the sprocket is fixed to the motor output shaft and the rotating shaft, and the chain is stretched between these sprockets. By rotating one motor, the winding rollers 34 and 35 can be synchronously rotated in the same direction.

The winding roller 3 of the above embodiment is
Dust removing means, such as a brush, are respectively provided opposite to the rollers 4 and 35 (especially the winding roller 35), and when the infrared transmitting film is wound up, dust or the like adhering to the infrared transmitting film is removed by the dust removing means. By doing so, the emissivity can be kept high. Further, at the end of the operation, if the ceiling opening 5a is covered with a portion where the opening of the infrared transmitting film is not formed, it is possible to prevent dust from entering the inside. Further, in the above embodiment, the infrared transmitting film 3
Although the arrangement space for the infrared transmitting film is reduced by adopting a mechanism for winding the infrared transmitting films 3, 38, the arrangement space is increased, but a mechanism for moving the infrared transmitting film along the ceiling surface is required. Can also be adopted.

In the above embodiment, the cooling or heating of the radiation panel 30 is performed by the refrigerant pipe 9 disposed in the radiation panel 30.
The present invention can be applied to a radiant air conditioner configured to cool or heat the radiant panel 30 by supplying cool air or warm air into the inside of the radiator panel 30.

[0058]

According to these inventions, during cooling operation,
Since the infrared transmitting film is provided in front of the radiation surface of the radiation panel, the occurrence of dew condensation on the radiation surface is prevented. At this time, the radiant energy is transmitted by the infrared transmitting film with some loss, but by preventing the occurrence of dew condensation as described above, the radiation surface temperature is lowered from the dew point temperature when no infrared transmitting film is provided. Since cooling can be performed, a desired cooling capacity can be obtained. Further, during the heating operation, since the infrared transmitting film is retracted from the front of the radiation surface of the radiation panel, the transmission loss of radiation energy by the infrared transmitting film is reduced, and a desired heating capacity can be obtained. .

In particular, according to the second aspect of the invention, when the occurrence of dew is not predicted by the predicting means, the infrared transmitting film is retracted from the front of the radiation surface of the radiation panel. Even in the case where there is no fear of dew condensation, the radiation surface of the radiation panel is exposed to the conditioned room, and in that case, the transmission loss of the radiation energy by the infrared transmitting film is reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an installation configuration of a radiant air conditioner according to the present invention.

FIG. 2 is a diagram showing a refrigerant circuit and an electric circuit of the radiant air conditioner.

FIG. 3 is a cross-sectional view showing the inside of a radiation box containing a radiation panel.

FIG. 4 is a developed plan view showing an embodiment of the infrared transmitting film provided in the radiation box.

FIG. 5 is a characteristic diagram showing a relationship between a difference between an ambient temperature and a radiation surface temperature during a cooling operation and a heat quantity of radiation treatment, with or without an infrared transmitting film as a parameter.

FIG. 6 is a characteristic diagram showing a relationship between a radiation surface temperature and an infrared transmitting film temperature during a cooling operation, with or without an infrared transmitting film as a parameter.

FIG. 7 is a characteristic diagram showing a relationship between a difference between a radiation surface temperature and an ambient temperature during a heating operation and a heat quantity of radiation treatment, with or without an infrared transmitting film as a parameter.

FIG. 8 is a developed plan view showing another embodiment of the infrared transmitting film provided in the radiation box.

[Explanation of symbols]

 5 Radiation Box 28 Control Means (Prediction Means) 30 Radiation Panel 30a Radiation Surface 33, 38 Infrared Transmitting Film 33A, 38A Opening Part 33a, 38a Opening 33B, 38B No Opening Part 36 Low Moisture Air Layer M1, M2 motor

Continuation of front page (72) Inventor's Agency Masayuki 2-5-1, Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (3)

[Claims] 1. A radiant air conditioner for cooling or heating a room by heat radiation from a radiating surface of a radiating panel, wherein a movable infrared transmitting film is provided in front of the radiating surface of the radiating panel, A radiation type air conditioner characterized by retracting the infrared transmitting film from the front of a surface. 2. A radiant air conditioner for cooling or heating a room by heat radiation from a radiating surface of a radiating panel, wherein a movable infrared transmitting film is provided in front of the radiating surface of the radiating panel, and the radiating surface is provided. A radiation predicting means for predicting the occurrence of dew condensation in the air conditioner, wherein when the occurrence of dew is not predicted by the predicting means, the infrared transmitting film is retracted from the front of the radiation surface. 3. The radiation type air conditioner according to claim 1, wherein a low humidity air layer is formed between the radiation surface and the infrared transmitting film.