JPH10185247A - Radiant type air-conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To alleviate the discomfort that, although in cooling operation air for preventing condensation effects prevention of condensation on a radiating surface, such air in part produces in human body as the air reaches. SOLUTION: For example, in cooling operation air for preventing condensation is supplied to the room-side surface 5a of the radiant side of a radiant panel 5 so as to prevent condensation. At this time the amount of air supplied for prevention of condensation is varied to indeterminate periods. As compared with constant supply of air or wavering of air in constant periods this method is designed to relieve the discomfort that human body 34 feels from part of the air for preventing condensation as its current reaches the body.

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, and more particularly to a technique for preventing a resident from feeling uncomfortable while preventing dew condensation on a radiant surface by an air flow.

[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.

[0005] 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. And such dew condensation on the radiation surface is
In addition to contaminating carpets and furniture due to dripping, it also causes the propagation of various bacteria on the radiating surface, so it must be removed, however, keep the temperature of the radiating surface low so that condensation does not occur Therefore, in reality, the cooling capacity had to be reduced, and a sufficient cooling effect could not be obtained.

[0006]

In order to solve such a problem during the cooling operation, a large number of small diameter air outlet holes are formed on the radiation surface of the radiation panel, and dry air is caused to flow out from these air outlet holes. Have been tried. That is, when an airflow or an air layer is generated along the radiation surface by the dry air, the dew point temperature around the radiation panel is reduced even if the temperature of the radiation panel is lowered, so that dew condensation on the radiation surface is prevented. However, there is a problem in that a part of the dry air supplied from the air outlet hole is peeled off from the radiation surface, reaches the occupant, and causes discomfort.

[0007] The present invention has been made in view of the above-described circumstances, and can prevent the radiation surface from being dewed during cooling while reducing the discomfort caused by the air current generated at the time of cooling. As a result, a comfortable air-conditioning environment can be provided. An object is to provide a radiation type air conditioner.

[0008]

According to the first aspect of the present invention, a room is cooled by heat radiation from a radiation surface of a radiation panel, and an air flow is formed on the radiation surface of the radiation panel to form the air. In a radiation type air conditioner configured to suppress dew condensation on a radiation surface by a flow, changing a flow rate of an air flow formed on a radiation surface of the radiation panel so as to have a power spectrum characteristic of a natural environment. It is a feature.

According to the first aspect of the present invention, for example, during cooling operation, air for preventing dew condensation is supplied to the indoor side surface of the radiation surface, thereby preventing the occurrence of dew condensation.
At this time, the flow rate of the supplied dew condensation preventing air changes so as to have the power spectrum characteristic of the natural environment, so that even if a part of the air flow reaches the human body, the flow rate is constant. Discomfort is reduced as compared to the case of fluctuations of a fixed period.

According to a second aspect of the present invention, the room is cooled by heat radiation from the radiation surface of the radiation panel, and an air flow is formed on the radiation surface of the radiation panel. In a radiation type air conditioner configured to suppress dew condensation, a flow rate of an air flow formed on a radiation surface of the radiation panel is changed so as to fluctuate by 1 / f.

According to the second aspect of the invention, the same operation as that of the first aspect is obtained, and in addition, the flow rate of the supplied dew condensation preventing air is 1 / f which is a natural fluctuation.
Therefore, the occupant's discomfort is reduced as compared with the first aspect.

According to a third 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. An outflow hole, and an air suction hole formed in the radiation surface and provided for suction of air, air flowing out of the air outflow hole and sucked into the air suction hole causes air on the surface of the radiation surface. A flow is formed, and the flow rate of the air flow is changed so as to have a fluctuation of 1 / f.

According to the third aspect of the present invention, air for preventing dew condensation flows out from the air outflow hole to the indoor side surface of the radiation surface, and this air is sucked in through the air suction hole.

In general, at the radiation surface at a substantially intermediate position between the air outflow hole and the air suction hole, the air flow tends to peel off from the radiation surface, and condensate tends to occur at that position.
However, according to the present invention, the flow rate of the air flow is 1 /
Since the position f changes so as to fluctuate, the position where the air flow easily peels approaches the air outflow hole, approaches the air suction hole, or moves repeatedly. Therefore, the occurrence of dew condensation due to peeling of the airflow is suppressed. At this time, since the air for preventing dew condensation is sucked through the air suction hole, the amount of air reaching the occupant is reduced and the flow rate of the air flow is reduced by 1 /.
Since f changes so as to fluctuate, the discomfort is further suppressed.

[0015]

An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the radiant air conditioner includes an indoor unit 2 disposed on a ceiling of a building 1, an outdoor unit 3 disposed outdoors, and a remote control disposed on a wall surface of the room. (Remote controller) 4 and the like. The indoor unit 2 includes an evaporator 6, a heat exchanger 7, an electric fan 8, and the like, which are disposed in the ceiling back 1a, in addition to the hollow radiation panel 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 5, the evaporator 6, and the heat exchanger 7, the first and second three-way valves V1 and V2, and the second and third electronic expansion valves MV2 are provided. , M
V3 and the check valves 12, 13 are connected. A refrigerant pipe 15, a heat exchanger 7, a second electronic expansion valve MV2, a check valve 12, a refrigerant pipe 16 are provided between the first three-way valve V1 and the radiation panel 5.
And a refrigerant pipe 14 that bypasses these.
(First bypass circuit) is provided. Further, a refrigerant pipe 17, a third electronic expansion valve MV3, an evaporator 6, a check valve 13, and a refrigerant pipe 18 are provided between the radiation panel 5 and the second three-way valve V2. A tube 19 (second bypass circuit) is provided.

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

As shown in FIG.
An indoor ECU (electronic control unit) 28 is provided, and an outdoor ECU 29 is provided in the outdoor unit 3. Each of the ECUs 28 and 29 includes various components such as an input / output interface, a ROM, and a RAM, in addition to a CPU that is a 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 5, a temperature sensor S2 provided near the radiation panel 5, a humidity sensor S3, and the like. Based on the input signal, the dew point temperature of the radiation panel 5 is determined by the temperature sensor S2,
Calculated according to the humidity sensor S3 and the electric fan 8
And the electromagnetic damper 11 (FIG. 1) in addition to the second and third electronic expansion valves MV2 and MV3, the first and second three-way valves V1 and V2, the evaporator 6, the heat exchanger 7, and the like. Electromagnetic damper 11
As shown in FIG. 1, the air outlet 10 a is provided on the ceiling plate 10 and is provided downstream of the heat exchanger 7 so that the air outlet 10 a can be closed.

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
They are connected to each other by signal lines, and are configured to mutually transmit and receive signals.

As shown in FIG. 3, the inside of the radiation panel 5 is provided with a chamber 5c on the air outflow side via a partition plate 5b.
And a chamber 5d on the air suction side, and these chambers 5c and 5d are arranged alternately. In each of the chambers 5c and 5d, 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. Tube 19
It is connected to the. When, for example, heat absorption is performed in the refrigerant pipe 9, radiant cooling is performed through the radiation surface 5 a on the indoor side of the radiant panel 5, whereas, when heating is performed in the refrigerant pipe 9, radiant cooling is performed through the radiation surface 5 a. It is configured to perform heating.

As shown in FIG. 3, a large number of air holes are formed in series on the radiation surface 5a of the radiation panel 5. Outflow air hole 5e among these air holes communicates with chamber 5c on the air outflow side, and suction air hole 5f communicates with chamber 5d on the air suction side. Each air hole 5
The shapes of e and 5f are the same.

Referring to FIG. 1, the chamber 5c on the air outflow side communicates with a space (a space downstream of the heat exchanger 7) 100 of the indoor unit 2 via a path not shown in the drawing, and a chamber on the air suction side. The chamber 5d communicates with the suction side of the electric fan 8 via a path not shown.
According to this, the air blown by the electric fan 8 is supplied to the chamber 5c on the air outflow side through the evaporator 6, the heat exchanger 7, and the space 100, and through the outflow air hole 5e as shown in FIG. After flowing out, an air flow is formed on the radiation surface 5a, the air is sucked into the chamber 5d on the air suction side through the suction air hole 5f, and then returned to the suction side of the electric fan 8.

According to this embodiment, in particular, the indoor side E
The CU 28 controls the driving of the electric fan 8, and changes the flow rate of the outflow so that the flow of air flowing out through the outflow air hole 5e becomes 1 / f, which is a natural fluctuation. Therefore, the number of rotations of the electric fan 8 is controlled.

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 depressurized refrigerant flows through the heat exchanger 7, the radiation panel 5, and the evaporator 6, and the three are used as coolers. That is, the four-way valve 21 is switched to the position indicated by the solid line, a and b of the first three-way valve V1 and A and B of the second three-way valve V2 are communicated, and the first electronic expansion valve MV1 is throttled.
The second and third electronic expansion valves MV2 and MV3 are fully opened. At this time, the damper 11 is erected as shown in FIG. 1, and the inside of the indoor unit 2 and the room are communicated with each other by 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 supplied to the refrigerant pipe 26.
The pressure is reduced by passing through the first electronic expansion valve MV <b> 1 via the valve, and the depressurized liquid refrigerant is supplied to the service valve V
4, the refrigerant pipe 27 passes through the first three-way valve V1,
5, heat exchanger 7, second electronic expansion valve MV2, check valve 12,
The liquid refrigerant flowing into the refrigerant pipe 9 in the radiation panel 5 via the refrigerant pipe 16 and flowing out of the refrigerant pipe 9 is supplied to the refrigerant pipe 1.
7. Flow into the evaporator 6 via the third electronic expansion valve MV3.

Since all of the heat exchanger 7, the radiation panel 5, and the evaporator 6 function as an evaporator, the liquid refrigerant passing through them evaporates while passing through them to become a gas refrigerant,
The air blown by the electric fan 8 is cooled by the latent heat of vaporization.

The cooling air is forcibly supplied into the room through the air outlet 10a, and the room is cooled by forced convection. The gas refrigerant from the evaporator 6 is supplied to the check valve 1
3, refrigerant pipe 18, second three-way valve V2, service valve V
5. Return to the compressor 20 again via the refrigerant pipe 23, the four-way valve 21, and the refrigerant pipe 24.

(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 a, c and the second of the first three-way valve V1 are reduced.
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 radiant panel 5, and
At this time, heat is absorbed and radiation cooling by the radiation panel 5 is performed. The refrigerant flowing out of the refrigerant pipe 9 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, the electric fan 8
There is no air agitation, and a comfortable environment is formed. At this time, the damper 11 is tilted, and the communication between the indoor unit 2 and the room is cut off.

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 5 is calculated based on the values detected by the temperature sensor S2 and the humidity sensor S3. Is done.

(3) The temperature detected by the temperature sensor S1 is
When the temperature becomes equal to the dew point temperature of the radiation panel 5, control is performed to prevent dew condensation on the radiation surface 5a of the radiation panel 5. That is, while the first electronic expansion valve MV1 is fully opened, the second and third electronic expansion valves MV2 and MV3 are throttled, and a and b of the first three-way valve V1 and A and B of the second three-way valve V2.
To communicate. Further, the number of revolutions of the electric fan 8 is controlled so that the supply air is supplied with a fluctuation of 1 / f. In addition, the indoor unit 2 remains in a state where the damper 11 is laid down.
Communication between the inside and the room is continuously interrupted.

Then, the refrigerant flows into the compressor 20, the four-way valve 2
1, condenser 22, first electronic expansion valve MV1, first three-way valve V
1 flows into the heat exchanger 7 through which the heat is radiated. The radiated refrigerant is decompressed by the second electronic expansion valve MV2, and the decompressed refrigerant passes through the refrigerant pipe 9 in the radiant panel 5, and is further dehumidified by the third electronic expansion valve MV3. The pressure is reduced to the temperature and flows into the evaporator 6, where heat is absorbed by the evaporator 6, and 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, while the heat exchanger 7 functions as a heating means, the radiant panel 5 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. The cooled and dehumidified air is heated by the heat exchanger 7 to become dehumidified and reheated air, and is supplied to the above-described chamber 5c on the air outflow side in the radiation panel 5. As shown in FIG. 3, the dehumidified / reheated air supplied to the chamber 5c on the air outflow side is blown out from the outflow air hole 5e, flows along the radiation surface 5a, and then flows into the suction air hole 5f. It is sucked and returned to the electric fan 8 via the air suction side chamber 5d. That is, the dehumidification / reheating air blown out from the outflow air hole 5e causes the dehumidification / reheating along the radiation surface 5a as indicated by an arrow in FIG.
A reheat air stream or a dehumidification / reheat air layer is created.

The dehumidifying / reheating air flow or the dehumidifying / reheating air layer prevents the dew condensation on the radiation surface 5a. For example, when the amount of air supplied by the electric fan 8 is constant (normal In the case where the air flow is formed in a specific manner), a substantially intermediate position 3 between the outflow air hole 5e and the suction air hole 5f is used.
At 0, for example, as shown in FIG. 3, the dehumidifying / reheating air flow is easily peeled off from the radiation surface 5a, and condensed easily. That is, there is a fear that the airflow does not reach the position 30 and dew condensation remains.

However, according to the present embodiment, since the dehumidifying / reheating air is formed with a fluctuation of 1 / f, the dehumidifying / reheating air flow is as shown in FIGS. 4 (a) and 4 (b). The position 31a (31b), which changes with time and the air flow tends to peel off (do not reach), is determined by the positions 5e and 5f.
Move repeatedly between. That is, as shown in FIG. 4B, the position 31a where the air flow easily peels off is covered with the air flow whose supply amount has changed, as shown in FIG. 4B, for example. The occurrence of dew condensation is prevented. On the other hand, the position 31b in FIG.
As shown in (a), the supply amount is covered by the changed airflow to prevent the occurrence of dew condensation at the position 31b.

As described above, according to the present embodiment, the occurrence of dew condensation on the radiation surface 5a of the radiation panel 5 is almost completely suppressed by supplying the dehumidifying / reheating air with a fluctuation of 1 / f. Can be. In addition, if the timing of changing the supply air amount is too long, the possibility of dew condensation increases depending on the surrounding air conditions. Therefore, it is preferable to set the timing to 10 seconds to 10 minutes. The third electronic expansion valve M
The opening degree of V3 and the number of revolutions of the compressor 20 are 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.

According to the above configuration, the dehumidified / reheated air blown out from the outflow air hole 5e is supplied to the suction air hole 5f.
As shown in FIG. 5, a part 32 of the air flow is separated from the radiating surface 5a of the radiating panel 5 and becomes a flow 33 directed downward (inhabited area) as shown in FIG. It can happen.

Here, as shown in FIG. 6, the sense of airflow felt by the human body becomes uncomfortable when the dehumidifying / reheating supply air for dew condensation prevention is supplied at a constant air volume, and the supply air is supplied at a constant cycle. In the case where the air is supplied by the fluctuation control, the discomfort is slightly improved as compared with the case where the air is supplied at a constant air volume, but it is not satisfactory. On the other hand, as in the present embodiment, the supply air is naturally supplied. When supplied by the fluctuation control of 1 / f, which is the fluctuation, it was found that the discomfort was greatly improved as compared with the above two cases, and the level reached almost no discomfort.

In short, according to the present embodiment, the supplied dew condensation preventing air is supplied with a fluctuation of 1 / f, which is a natural fluctuation (the power spectrum characteristic has the natural environment). Therefore, even if a portion of the air 32 is peeled off and reaches the human body 34, the airflow is hardly discomfort, and a comfortable air-conditioning environment is formed.

(4) During the heating operation in winter or the like,
As shown in FIG. 2, the four-way valve 21 is switched as shown by a dotted line, and A, C of the second three-way valve V2 and the first three-way valve V
1, a and c are communicated to select a second bypass circuit by the refrigerant pipe 19 and a first bypass circuit by the refrigerant pipe 14;
By flowing the refrigerant only to the radiant panel 5, radiant heating by the radiant panel 5 is performed.

Although the present invention has been described based on one embodiment, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above embodiment, the outflow air hole 5e and the suction air hole 5e are used.
Although f is provided on the radiation surface 5a of the radiation panel 5, all or a part of them may be provided around the radiation surface 5a. In short, the air holes 5e and 5f form the radiation surface 5a.
It is sufficient that an air flow or an air layer along a can be formed. Also,
In the above embodiment, the air for dew condensation prevention is circulated and supplied by one electric fan 8, but two electric fans are provided, and the supply of air to the room by each electric fan and the The air may be discharged. Further, in the above embodiment, the dehumidifying air is more preferably dehumidified / reheated air, but is not limited to this, and may be air that has not been dehumidified. In the above embodiment, the air is supplied with 1 / f fluctuation by controlling the rotation speed of the electric fan 8 and changing the supply air amount with time. For example, it is also possible to change the supply air amount with time.

Further, in the above embodiment, the suction air hole 5f is provided, but the present invention can be applied to a structure without the suction air hole 5f. In this case, while reducing the airflow reaching the human body 34,
The effect of suppressing dew condensation on the entire radiation surface 5a of radiation panel 5 is slightly reduced.

In the above-described embodiment, as a more preferable example, air for preventing condensation is supplied at 1 / f fluctuation, but the amount of air for preventing condensation is changed at irregular intervals. Even if it is supplied, discomfort can be reduced, and the occurrence of dew condensation on the radiation surface 5a can be prevented. Further, in the above-described embodiment, the cooling or heating of the radiation panel 5 is performed by the refrigerant pipe 9 disposed in the radiation panel 5, but by supplying the cool air or the hot air into the radiation panel 5 The present invention can be applied to a device that cools or heats the radiation panel 5.

[0049]

As described above, according to the first aspect of the present invention, for example, during cooling operation, air for preventing dew condensation can be supplied to the indoor surface of the radiation surface.
In addition to preventing dew condensation, the amount of air to be supplied at this time is varied at irregular intervals so that the power spectrum characteristics of the natural environment can be obtained. , The discomfort can be reduced, and as a result, a comfortable air-conditioning environment can be provided.

According to the second aspect of the present invention, since air for preventing dew condensation can be supplied to the indoor side surface of the radiation surface during, for example, a cooling operation, it is possible to prevent the occurrence of dew condensation and to supply the air at this time. Since the air for preventing dew condensation is supplied at the fluctuation of 1 / f, which is a natural fluctuation, even if a part of the air reaches the human body, the discomfort is more increased than in claim 1. As a result, it is possible to provide a more comfortable air-conditioning environment.

According to the third aspect of the present invention, for example, during cooling operation, air for preventing condensation is supplied to the indoor surface of the radiation surface from the air outflow hole, and the supplied air is sucked through the air suction hole. Because, for example, at the radiation surface at a substantially intermediate position between the air outflow hole and the air suction hole, for example,
The supply air is easily peeled off from the radiation surface and the dew condensation resistance is low. However, since the supply air is supplied with a fluctuation of 1 / f, the position where the supply air easily peels off on the radiation surface repeatedly moves between the two. In addition, the occurrence of dew can be more completely prevented. At this time, since the supplied dew condensation preventing air is sucked through the air suction hole, the air reaching the human body can be further reduced, and as described above,
Since the air reaching the human body is supplied with the fluctuation of 1 / f, which is a natural fluctuation, the uncomfortable feeling of the air flow can be further reduced. As a result, an even more comfortable air-conditioning environment can be provided.

[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 the radiation panel.

FIG. 4 is an explanatory view showing a temporal change in the flow of air for preventing dew condensation supplied from the radiation panel to the indoor surface of the radiation surface.

FIG. 5 is an explanatory view showing a state in which a part of the dew condensation preventing air reaches a human body.

FIG. 6 is a sensation evaluation diagram showing the feeling of airflow felt by the human body for each control of supply air for preventing dew condensation that reaches a part of the human body.

[Explanation of symbols]

 Reference Signs List 5 Radiation panel 5a Radiation surface 5e Air outflow hole 5f Air suction hole 6 Evaporator 7 Heat exchanger 8 Electric fan 28 Indoor ECU

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 room is cooled by heat radiation from a radiation surface of a radiation panel, and an airflow is formed on a radiation surface of the radiation panel, and dew condensation on the radiation surface is suppressed by the airflow. A radiation type air conditioner, wherein a flow rate of an air flow formed on a radiation surface of the radiation panel is changed so as to have a power spectrum characteristic of a natural environment. 2. The room is cooled by heat radiation from the radiation surface of the radiation panel, and an air flow is formed on the radiation surface of the radiation panel, so that dew condensation on the radiation surface is suppressed by the air flow. In the radiation type air conditioner, a flow rate of an air flow formed on a radiation surface of the radiation panel is set to 1
A radiant air conditioner characterized by changing so as to fluctuate / f. 3. A radiation type air conditioner for cooling or heating a room by heat radiation from a radiation surface of a radiation panel. And an air suction hole provided for suction of air, wherein the air flowing out of the air outflow hole and sucked into the air suction hole forms an air flow on the surface of the radiation surface, and the air A radiation type air conditioner, wherein a flow rate of a flow is changed so as to fluctuate by 1 / f.