JPH07190400A - Air conditioning device - Google Patents

Abstract

PURPOSE:To eliminate an operation failure or a disadvantage produced by the generation of dew condensation by performing comfortable radiant cooling to a satisfactory extent. CONSTITUTION:A radiation panel 31 which is placed in contact with a refrigerant pipe 33, is laid out inside an indoor unit which is provided with a convective heat exchanger 21 which exchanges heat between an indoor air and refrigerants and a horizontal flow fan 23 which convects the indoor air by way of the heat exchanger 21. A front panel 25 made of an infrared ray permeable material, which constitutes the front part of the indoor unit is installed to the radiant panel with a specified void 27. The void 27 is adapted to distribute the air from an inlet 27a near a suction port 15 at an outlet 27b near a blow off port 17 in structure.

Description

Detailed Description of the Invention

[0001]

This invention relates to an indoor unit,
The present invention relates to a convection-type air conditioner that controls room temperature by exchanging heat between indoor air and a refrigerant flowing through a heat exchanger.

[0002]

2. Description of the Related Art In a convection type air conditioner, the indoor air sucked from an inlet by the rotation of a cross flow fan incorporated in an indoor unit is heat-exchanged with a refrigerant flowing inside by passing through a heat exchanger. The cold air or the warm air is blown into the room through the air outlet. At this time, the air blown out not only directly hits the human body, but also the air in the room flows due to a sufficiently large airflow,
It may be uncomfortable due to so-called air flow.

That is, in both heating and cooling, the draft feeling due to the air flow, that is, the speed of the air flow at the time of hitting the human body,
The feeling of cooling is different from the feeling of heating, and the sensible temperature is lowered due to the feeling of airflow especially during heating.

Therefore, conventionally, as shown in FIG. 5, there is a convection type indoor unit provided with a radiation radiator 1 so that radiation type air conditioning can be performed. This indoor unit is a floor-standing type, and a cross-flow blower 3 is used to lower the suction port 5
The indoor air is sucked from the air, and the sucked air is heat-exchanged with the refrigerant by passing through the convection heat exchanger 7. The hot air is heated during heating, the cold air is cooled during cooling, and the air is discharged from the upper outlet 9 respectively. Blowout and convection air conditioning.

On the other hand, in the radiant heat radiator 1, the front panel 11 of the indoor unit also serves as a radiant panel, and a refrigerant pipe through which a refrigerant flows inside the front panel 11 as in the convection heat exchanger 7. 13 is installed in a thermally closely contacted state. The temperature of the front panel 11 is adjusted by the heat of the refrigerant flowing through the refrigerant pipe 13, and the infrared rays emitted from the surface of the front panel 11 hit the human body or the inner wall of the room to heat or cool them. When heating, the surface temperature of the front panel 11 rises, at this time, infrared rays with a long wavelength are radiated to radiate heating, and when cooling, the surface temperature of the front panel 11 decreases, and at this time, infrared rays with a short wavelength are radiated to radiate cooling. , Respectively.

In such a convection type air conditioner capable of radiant air conditioning, the heating capacity can be entirely covered by the radiant air conditioning during heating in order to eliminate the above-mentioned uncomfortable feeling due to the air flow, particularly during heating. In this case, it is desirable to increase the ratio of radiant air conditioning as much as possible by stopping the rotation of the cross flow fan 3. At this time, if the refrigeration cycle has a configuration in which it is possible to select whether or not to flow the refrigerant to the convection heat exchanger 7 with a two-way valve, the two-way valve is switched so that the refrigerant does not flow to the convection heat exchanger 7.

When the heating load is large, such as when the heating is started, the combined operation of radiation and convection is performed. of course,
If the refrigeration cycle has a configuration in which it is possible to select whether or not to flow the refrigerant through the refrigerant pipe 13 that contacts the front panel 11 with a two-way valve,
The refrigerant pipe 13 may be switched so as not to flow the refrigerant, and heating may be performed only by strong convection air conditioning.

On the other hand, even during cooling, if the room temperature is a desired temperature, the feeling of airflow often causes a discomfort. In such a case, the ratio of radiant air conditioning in the cooling capacity should be increased. Is desirable.

However, the high-humidity air is cooled on the surface of the front panel 11 having a low temperature, and at this time, the front panel 11 is cooled.
If the surface temperature of the water is lower than the dew point temperature of the indoor air, dew condensation will occur on the surface of the front panel 11 and the condensed water will be
It will flow down along with and will deteriorate the appearance.
Further, since the generated dew condensation water is on the surface of the front panel 11, it is difficult to treat it.

On the other hand, conventionally, the occurrence of dew condensation was prevented by the following method.

(1) Refrigerant tube 13 in contact with the front panel 11
When there is a means for switching so that the refrigerant does not flow, the radiation air conditioning is not performed and only the convection air conditioning is performed.

(2) When the switching means of (1) above is not provided, the dehumidifier is also operated to remove the moisture.

(3) The refrigeration cycle is managed so that the surface temperature of the front panel 11 does not fall below the dew point temperature of room air.

[0014]

However, when the method for preventing the occurrence of dew condensation as described above is adopted,
In either case, there is a problem that satisfactory radiation cooling cannot be performed.

Therefore, the present invention has as its object to eliminate the problems caused by the occurrence of dew condensation while performing sufficiently comfortable radiant cooling.

[0016]

In order to achieve the above object, the present invention provides a heat exchanger for exchanging heat between indoor air and a refrigerant, and a blower for convection of the indoor air through the heat exchanger. Inside the provided indoor unit, a radiant panel that receives heat from the refrigerant pipe is arranged, and a front panel made of an infrared transparent material that constitutes the front part of the indoor unit is provided with a predetermined gap with respect to this radiant panel, The void has a structure in which indoor air flows from one end to the other end.

[0017]

According to the air conditioner having such a structure, during the radiation cooling, the radiation panel is cooled by the refrigerant passing through the refrigerant tube, and infrared rays having a short wavelength are radiated from the surface of the radiation panel. After passing through the front panel, it reaches the room and is cooled by radiation. During such radiation cooling, room air circulates in the gap between the radiation panel and the front panel, and the air layer in this gap prevents the cold heat of the radiation panel surface from being transmitted to the front panel. The temperature drop is prevented and the dew condensation on the front panel surface is prevented.

[0018]

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

FIG. 1 is a sectional view of an indoor unit used in an air conditioner showing an embodiment of the present invention. This indoor unit is of the floor type and has a suction port 15 at the bottom.
However, outlets 17 are formed in the upper part. In the air flow path 19 between the intake port 15 and the outlet port 17,
The convection heat exchanger 21 is provided on the side of the suction port 15 and the outlet 17
The cross-flow blowers 23 are arranged on the respective sides.

The front panel 25 of the indoor unit is made of a material that transmits infrared rays, such as polyethylene. Inside the front panel 25, a predetermined space 27
A radiation radiator 29 is disposed at a distance. The radiation radiator 29 includes a radiation panel 31 arranged in parallel with the front panel 25, and a refrigerant pipe 33 installed in close contact with the surface of the radiation panel 31 on the air flow path 19 side.

The lower end of the radiation panel 31 is located near the suction port 15 and the upper end thereof is located near the blowout port 17, respectively, so that the air passage 19 generated by the rotation of the cross flow fan 23 is formed in the gap 27. Similarly to the air flow inside, the room air sucked from the suction port 15 is
An airflow that flows in from a and flows out from the upper outlet portion 27b is formed.

Below the convection heat exchanger 21 and the radiation panel 31, a drain pan 35 for collecting condensed water generated by these is arranged.

FIG. 2 is a block diagram of the refrigeration cycle including the convection heat exchanger 21 and the radiation radiator 29 provided in the indoor unit as described above. Here, the convection heat exchanger 21
And a radiation radiator 29 are connected in series, and a compressor 37, a four-way valve 39, an outdoor heat exchanger 41,
The throttle 43 is connected by a refrigerant pipe.

In the air conditioner having such a configuration, the refrigerant discharged from the compressor 37 passes through the four-way valve 39 during the cooling, and the outdoor heat exchanger 41, the throttle 43, the radiation radiator 29, the convection heat exchanger. 21 and return to the compressor 37 through the four-way valve 39. On the other hand, during heating, the refrigerant discharged from the compressor 37 returns to the compressor 37 through the four-way valve 39, the convection heat exchanger 21, the radiation radiator 29, the throttle 43, the outdoor heat exchanger 41, and the four-way valve 39.

Here, due to the rotation of the cross-flow fan 23, the indoor air flowing in from the suction port 15 is convected by the convection heat exchanger 21.
After passing through the heat exchanger and exchanging heat with the refrigerant, it is blown into the room from the outlet 17 and is cooled or heated by convection air conditioning. A part of the room air sucked from the suction port 15 flows into the gap 27 from the inlet portion 27a at the lower end of the radiation panel 31 and flows from the outlet portion 27b into the air flow passage 19 due to the airflow, temperature difference, and pressure difference. The air that has flown out and has exchanged heat in the convection heat exchanger 21 flows out into the room through the outlet 17.

On the other hand, the radiant panel 31 is cooled or warmed by the refrigerant passing through the refrigerant pipe 33 of the radiant radiator 29, infrared rays are radiated from the surface thereof, and most of the radiated infrared rays pass through the front panel 25. Is radiated into the room and is cooled or heated by radiant air conditioning.

Since the front panel 25 is sufficiently transparent to infrared rays, there is almost no temperature change due to radiation. Further, the air in the gap 27 between the radiation panel 31 and the front panel 25 is not cooled during cooling and is not warmed during heating, and also due to airflow, temperature difference, and pressure difference. Since it is flowing, heat transfer from the radiation radiator 29 to the front panel 25 is also prevented by this air layer, and the front panel 25
Does not easily change temperature.

Therefore, during cooling, even if the surface temperature of the radiation panel 31 is sufficiently low, the front panel 25 is not cooled and dew condensation does not occur on the surface of the front panel 25. As a result, the surface temperature of the radiation radiator 29 can be lowered without paying attention to the generation of dew condensation water on the surface of the front panel 25, and a sufficiently comfortable radiation cooling can be performed. For example, even when the room air is hot and humid, such as when cooling is started, the maximum cooling capacity may be exhibited in both convection air conditioning and radiant air conditioning.

When the surface temperature of the radiation panel 31 becomes lower than the dew point temperature of the room air during cooling, dew condensation occurs on the surface of the radiation panel 31, but the radiation panel 31 cannot be seen from the outside by the front panel 25. , Deterioration of appearance due to generation of condensed water does not occur. The condensed water generated on the surface of the radiation panel 31 is collected by the drain pan 35 together with the condensed water generated in the convection heat exchanger 21.

The refrigeration cycle structure is as shown in FIG.
The convection heat exchanger 21 and the radiation radiator 29 may be connected in parallel. In this case, the two-way valves 45 and 47 are provided in the refrigerant pipes near the convection heat exchanger 21 and the radiation radiator 29, so that only the radiation air conditioning operation and the convection air conditioning operation are performed. It is possible to have three operation patterns including combined operation of radiation and convection.

Regarding the two-way valves 45 and 47, by providing only the two-way valve 45, two operation patterns are possible, that is, operation with only radiant air conditioning and combined operation with radiation and convection. By providing only 47, two operation patterns, that is, an operation of only convection air conditioning and an operation of convection / radiation combined use, are possible. Further, the two-way valves 45 and 47 may not be provided.

FIG. 4 is a sectional view of an indoor unit used in an air conditioner showing another embodiment of the present invention. This indoor unit is a wall-mounted type, and a suction port 15 is formed in the upper part and a discharge port 17 is formed in the lower part. The convection heat exchanger 21 is on the upper suction port 15 side, and the cross-flow blower 23 is the lower discharge part. They are arranged on the mouth 17 side, respectively.

The front panel 25 is made of polyethylene which is an infrared ray transmitting material similar to that shown in FIG. 1, and the inside of the front panel 25 is similar to that shown in FIG.
A radiation radiator 29 including a radiation panel 31 and a refrigerant pipe 33 is arranged at a predetermined gap 27.

In this case, the inlet portion 27a of the space 27 into which the indoor air flows is located in the upper portion, and the outlet portion 27b is located in the lower portion. A drain pan 45 for collecting condensed water generated in the radiation radiator 29 is provided below the radiation radiator 29 so as to cover the outlet portion 27b. Further, below the convection heat exchanger 21, there is provided a drain guide plate 47 that guides the condensed water generated in the heat exchanger 21 and guides it to the lower drain pan 45.

The refrigeration cycle configuration in the air conditioner in which the indoor unit of FIG. 4 is used may be that of FIG. 2 or FIG.

The air conditioner having such an indoor unit also has the same effect as the indoor unit shown in FIG.

[0037]

As described above, according to the present invention, the infrared rays having a short wavelength radiated from the surface of the radiant panel that is cooled during radiant cooling are transmitted through the front panel and radiated into the room to be radiantly cooled. In addition, since room air flows through the gap between the radiation panel and the front panel, the air layer in this gap prevents the cold heat of the radiation panel surface from being transmitted to the front panel, and the temperature of the front panel is reduced. As a result, it is possible to prevent the occurrence of dew condensation on the surface of the front panel. During radiant cooling, if the surface temperature of the radiant panel becomes lower than the dew point temperature of the room air, dew condensation will occur on the surface of the radiant panel, but this radiant panel cannot be seen from the outside by the front panel. Does not occur. As a result, the surface temperature of the radiation panel can be lowered without worrying about the occurrence of dew condensation on the surface of the front panel, and a sufficiently comfortable radiation cooling can be performed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an indoor unit used in an air conditioner showing an embodiment of the present invention.

FIG. 2 is a refrigeration cycle configuration diagram including a convection heat exchanger and a radiation radiator provided in the indoor unit of FIG.

FIG. 3 is a refrigeration cycle configuration diagram showing another example.

FIG. 4 is a cross-sectional view of an indoor unit used in an air conditioner showing another embodiment of the present invention.

FIG. 5 is a cross-sectional view of an indoor unit used in an air conditioner showing a conventional example.

[Explanation of symbols]

 21 Convection Heat Exchanger 23 Cross Flow Blower 25 Front Panel 27 Gap 27a Inlet Part (One End) 27b Outlet Part (Other End) 31 Radiation Panel

Claims (1)

[Claims] 1. Radiation for receiving heat from a refrigerant pipe inside an indoor unit equipped with a heat exchanger for exchanging heat between indoor air and a refrigerant and a blower for convection of the indoor air through the heat exchanger. A panel is arranged, and a front panel made of an infrared transmissive material that constitutes the front part of the indoor unit is provided with a predetermined gap with respect to the radiation panel, and the gap is
An air conditioner having a structure in which indoor air flows from one end to the other end.