JPH0781756B2 - Air conditioner with radiant panel - Google Patents

Description

The present invention relates to an improvement of an air conditioner with a radiation panel.

[Conventional technology]

The conventional ceiling radiant air conditioning system is described in "Air Conditioning and Sanitary Engineering Vol. 59, No. 4, P. 63", and a summary of the figure is cited in Fig. 8. 101 is a ceiling suspension radiation panel,
It is attached to the ceiling of the living room or office room 114. Reference numeral 115 is a pipe for supplying cold / hot water, 102 is a circulation pump, 103 is a three-way valve, 104 is a cold / hot water tank, 105 is a heat source device such as a heat pump, and 106 is a circulation pump.

On the other hand, the room 114 is provided with a return air port 107, from which air is sucked by the duct 108, dust is removed by the filter 109, moisture is removed by the dehumidifier 110 containing lithium chloride and the like, and air pressure is sent by the blower 111. And the temperature is lowered by the cold water coil 112, and the air supply port 113
Is blown into the room from.

[Problems to be solved by the invention]

The conventional example of FIG. 8 is suitable for equipment such as large buildings and offices, but to expand to a general house, heat pump 105, circulation pumps 102, 106, cold and hot water tank 104, pipe 1
It is difficult because there are many related accessories such as 15 and equipment cost rises. Further, when cold water is supplied to the ceiling suspension radiation panel 101, dew condensation occurs on the surface when the humidity of the indoor air is high.

Therefore, in the conventional example, the dehumidifier 11 containing lithium chloride or the like is used.
At 0, dew condensation is prevented by removing moisture from the air and reducing the humidity. However, the system is complicated due to the provision of an independent dehumidifier, and maintenance is very troublesome.

Therefore, the present invention can eliminate the conventionally required accessory equipment such as a circulation pump, a hot and cold water tank, a three-way valve, and a pipe, which can be simplified and inexpensive, and does not require a special dehumidifier conventionally required. An object of the present invention is to provide an air conditioner with a radiant panel.

[Means for solving problems]

In order to achieve the above object, the present invention provides an air conditioner with a radiant panel including a refrigeration compressor, a four-way valve, an outdoor heat exchanger, a throttle device, an indoor heat exchanger and a radiant panel, wherein the radiant panel and the indoor heat exchanger are And a cooling device connected in parallel in the refrigerant circuit, at the time of cooling, the surface temperature of the radiation panel is measured, and the radiation panel is provided with a means for controlling the surface temperature to a temperature higher than the dew point temperature. It is an attached air conditioner.

[Action]

By connecting the radiant panel and the indoor heat exchanger in parallel to the refrigerant circuit as described above, auxiliary equipment such as a circulation pump cold / hot water tank and a three-way valve becomes unnecessary. Further, since the means for controlling the surface temperature of the radiation panel to a predetermined temperature is provided, a special dehumidifier is unnecessary.

〔Example〕

Hereinafter, the present invention will be described with reference to the embodiments shown in the drawings. 1 to 3 show the first embodiment, FIG. 1 is a refrigerant system diagram of an air conditioner with a radiation panel, and FIG. 2 is a side view showing an outline during a cooling operation. 1 is a refrigeration compressor (hereinafter referred to as a compressor)
Make up 14. The following configuration is connected to the outdoor unit 14. 2 is a four-way valve, 3 is an outdoor heat exchanger, 4
Is an expansion valve, 9 is an accumulator, that is, 5 is a two-way valve, 6 is a check valve, 7 is an indoor heat exchanger, 8 is a blower,
Reference numeral 10 is a two-way valve, 11 is a check valve, 12 is a ceiling-mounted radiant panel (hereinafter referred to as a radiant panel), and 13 is a radiant heat exchanger.

The operation of the air conditioner with a radiation panel configured as described above will be described. During the cooling operation, the refrigerant compressed by the compressor 1 becomes a high-temperature and high-pressure gaseous refrigerant, passes through the four-way valve 2 and the outdoor heat exchanger 3, and is condensed and liquefied. Further, it is decompressed by the expansion valve 4 to become a low-temperature low-pressure refrigerant, and thereafter, the low-temperature low-pressure liquid refrigerant takes heat from the surroundings in the tube of the indoor heat exchanger 7 or the radiant heat exchanger 13 in the radiant panel 12. Evaporate and vaporize. The vaporized refrigerant is sucked into the compressor 1 via the four-way valve 2 and the accumulator 9.

Next, the control during the cooling operation will be described. At rising, the two-way valve 10 is closed and the two-way valve 5 is open. Therefore, the low-temperature low-pressure refrigerant evaporates in the indoor heat exchanger 7, and the blower 8 blows cold air into the room. At this time, the moisture in the air in the room is dehumidified by the heat exchanger 7, and the absolute humidity in the air decreases. In the process of this rising motion, the radiant heat exchanger
The refrigerant is not supplied into 13 and is sucked by the compressor 1, and since the ambient temperature is higher than the saturation temperature of the refrigerant, it is in a superheated gas state. Therefore, the surface temperature of the radiant heat exchanger 13 is equal to the ambient temperature, the dew condensation on the surface is slight, and water drops do not fall into the room. After reaching the vicinity of a predetermined room temperature through such a rising operation, the two-way valve 5 is closed and the two-way valve 10 is opened. Normally, the design conditions for indoor air during cooling are 27 ° C (dry bulb) 50% (relative humidity)
Therefore, the dew point temperature at this time is 16 ° C.

In the present invention, the surface temperature T _s of the radiation panel 12 is measured by the measuring means 15 as shown in the compressor controller of FIG.
It has a setting means 16 for T _s , a reference temperature calculating means 17 creates a set temperature, and a comparison means 19 compares the surface temperature T _s with the set temperature. As a result, when the surface temperature T _s is lower than the set temperature, the compressor is set. 1
The lowering signal that outputs a signal for lowering the number of rotations is supplied to the compressor rotation number control device 20. As a result, the amount of refrigerant supplied into the radiation panel 12 decreases and the evaporation temperature rises. When the reference temperature calculation means 17 produces a set temperature and the surface temperature T _s is compared with the set temperature by the comparison means 18, when the surface temperature T _s is higher than the set temperature, a signal for increasing the rotation speed of the compressor. Give out. The rising signal is supplied to the compressor rotation speed control device 20. As a result, the amount of refrigerant supplied into the radiation panel 12 increases and the evaporation temperature decreases.

In this way, the surface temperature T _s of the radiant panel 12 can be controlled to 16 to 18 ° C., which is slightly higher than the dew point temperature, so that a comfortable radiant cooling feeling can be provided to the occupants and water droplets due to dew condensation can be prevented.

During the heating operation, the refrigerant compressed by the compressor 1 becomes a high-temperature, high-pressure gaseous refrigerant and flows through the four-way valve 2 into both the indoor heat exchanger 7 and the radiant heat exchanger 13. The refrigerant condensed and liquefied in the indoor heat exchanger 7 and the radiant heat exchanger 13 is decompressed by the expansion valve 4, evaporated and vaporized in the outdoor heat exchanger 3, and sucked into the compressor 1 through the four-way valve 2 accumulator 9. . In this way, a comfortable feeling of heating can be obtained by both warm air heating and radiant heating during heating.

According to the first embodiment described above, since the refrigerant such as the circulation pumps 102 and 106, the hot / cold water tank 104, and the Freon is made to flow directly into the radiation panel 12, the refrigerant is directly evaporated or condensed therein. The necessary accessories such as the three-way valve 103 pipe 15 are no longer required. The surface temperature of the radiant panel 12 is detected, and the amount of refrigerant circulation flowing into the radiant panel 12 is controlled by the capacity control (rotation speed control) of the compressor 1, thereby maintaining the surface temperature of the radiant panel 12 at a predetermined temperature, It is possible to prevent dew condensation, and thus a special dehumidifier that has been conventionally required is not required.

Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a refrigerant system diagram, FIG. 5 is a schematic side view during cooling operation, FIG. 6 is a perspective view showing an outline of a radiant heat exchanger, and FIG. 7 is a diagram for explaining the operation of the electronic expansion valve. Is. As shown in the figure, the difference from the first embodiment is that instead of the two-way valve 10 and the check valve 11, a check valve 11 is connected in parallel to the electronic expansion valve 10A as a four-way valve 2. This is a point provided between the radiant heat exchangers 13.

The operation of the second embodiment of the present invention thus configured will be described, but the control during the cooling operation different from that of the first embodiment will be described. At the time of rising, the electronic expansion valve 10A is closed and the two-way valve 5 is open. Therefore, the low-temperature low-pressure refrigerant evaporates in the indoor heat exchanger 7, and the blower 8 blows cold air into the room. At this time, the moisture in the air in the room is dehumidified by the heat exchanger 7, and the absolute humidity in the air decreases. Note that FIG. 6 is a side view of the radiant panel, and in the process of this rising operation, the refrigerant in the radiant heat exchanger 13 is in a low pressure state,
Moreover, since the ambient temperature is higher than the saturation temperature of the refrigerant, it becomes a superheated gas state, and since the liquid refrigerant is not positively supplied, the surface temperature of the radiant heat exchanger 13 becomes equal to the ambient temperature, and the dew condensation on the surface becomes slight No water drops will fall on it.

Through such a rising operation, the electronic expansion valve 10 is opened after the temperature reaches near the predetermined room temperature. The design condition for indoor air during normal cooling is 27 ° C (dry bulb) 50% (relative humidity), so the dew point temperature at this time is 16 ° C.

In the second embodiment of the present invention, as shown in FIG. 7, the surface temperature T _s of the radiation panel 12 is detected by the measuring means 15, while the setting means 16 of T _s is provided and set by the reference value calculating means 17. When the temperature is generated and the surface temperature T _s is compared with the set temperature by the comparison means 19, if the surface temperature T _s is lower than the set temperature, the electronic expansion valve 10
(Valve) closed in the closing direction Electronic expansion valve 10A (valve)
Increase the pressure loss in the radiation panel 12 and raise the temperature in the radiation panel 12. When the reference temperature calculation means 17 produces a set temperature and the surface temperature T _s is compared with the set temperature by the comparison means 18, when the surface temperature T _s is higher than the set temperature, the electronic expansion valve 10A is opened in the opening direction. , Radiation panel 1 to reduce the pressure loss of electronic expansion valve 10A
Lower the temperature in 2. In this way, the surface temperature of the radiation panel 12 can be controlled to 16 to 18 ° C, which is slightly higher than the dew point temperature,
It is possible to provide a comfortable radiant cooling feeling to the occupants and prevent water drops from dripping due to dew condensation.

In the second embodiment described above, when the operation is started, moisture in the room air is dehumidified, and then the surface temperature of the radiation panel 12 is detected,
Since the flow rate of the refrigerant flowing into the radiant panel 12 is controlled, the surface temperature of the radiant panel does not drop below a predetermined temperature, and dew condensation on the surface can be prevented. Therefore, a dehumidifier, which has been conventionally required, is unnecessary. This point is different from the first embodiment.

〔The invention's effect〕

According to the present invention described above, since the refrigerant is allowed to flow directly into the radiation panel, the circulation pump, the hot and cold water tank, the three-way valve, etc., which have been conventionally required, are not required, and it is simple and inexpensive, and the surface temperature of the radiation panel can be detected. To control the rotation speed of the compressor, or to keep the surface temperature of the panel above the dew point temperature by controlling the evaporation temperature in the radiation panel by installing an electronic expansion valve (valve) at the exit of the radiation panel during cooling. Therefore, it is possible to provide a radiation panel-equipped air conditioner which can prevent dew condensation on the panel surface and can be erased without providing a special dehumidifier conventionally required.

[Brief description of drawings]

1 to 3 show a first embodiment of the present invention. FIG. 1 is a refrigerant system diagram of an air conditioner with a radiation panel, and FIG. 2 is a side view showing an outline during cooling operation. FIGS. 3 and 4 are block diagrams of a compressor control device, FIGS. 4 to 7 show a second embodiment of the present invention, and FIG. 4 is a refrigerant system of an air conditioner with a radiation panel. Fig. 5, Fig. 5 is a side view showing the outline of the cooling operation, Fig. 6 is a perspective view showing the outline of the radiant heat exchanger, and Fig. 7 is a block diagram of the electronic expansion valve shown in Fig. 4 when the electronic expansion valve is opened and closed. FIG. 8 is a system diagram showing an example of a conventional ceiling radiation air conditioning system. 1 ... Compressor, 2 ... Four-way valve, 3 ... Outdoor heat exchanger, 4
...... Expansion valve, 5,10 ...... 2-way valve, 10A ...... Electronic expansion valve,
6,11 …… Check valve, 7 …… Indoor heat exchanger, 8 …… Blower,
9 ... Accumulator, 12 ... Radiant panel, 13 ... Radiant heat exchanger.

Claims (1)

[Claims] 1. An air conditioner with a radiation panel comprising a refrigeration compressor, a four-way valve, an outdoor heat exchanger, a throttle device, an indoor heat exchanger and a radiation panel, wherein the radiation panel and the indoor heat exchanger are refrigerant circuits. While connected in parallel, while cooling,
An air conditioner with a radiation panel, comprising means for measuring the surface temperature of the radiation panel and controlling the surface temperature to a temperature higher than the dew point temperature.