JP2685230B2 - Air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat pump type air conditioner for cooling and heating by radiation.

2. Description of the Related Art In recent years, air conditioners have been improved with a focus on comfort in a living space, and in particular, cooling and heating by radiation, which has almost no feeling of airflow, is drawing attention.

An example of the conventional air conditioner described above will be described below with reference to the drawings.

FIG. 3 shows a refrigeration cycle diagram of a conventional air conditioner. In the figure, 1 is a compressor, 2 is a four-way valve, 3
Is an outdoor heat exchanger, 4 is an outdoor expansion valve, 5 is an accumulator, 6 is an outdoor fan, and is provided in the outdoor unit 7. Reference numerals 8a to 8c denote indoor surface heat exchangers, which are connected in parallel to the outdoor unit 7 to form a heat pump type refrigeration cycle.

The operation of the air conditioner configured as above will be described below.

During cooling, the high-temperature and high-pressure refrigerant compressed by the compressor 1 is condensed and liquefied by the outdoor heat exchanger 3 through the four-way valve 2, decompressed by the outdoor expansion valve 4, and the indoor surface heat exchangers 8a to 8c. Then, it vaporizes and is returned to the compressor 1 through the four-way valve 2 and the accumulator 5. At this time, the indoor surface heat exchangers 8a to 8c serve as evaporators to cool the indoor air by natural convection and to cool it by radiation. Further, during heating, the refrigerant circuit is switched by the four-way valve 2, and the indoor surface heat exchangers 8a to 8c serve as condensers to heat the indoor air by natural convection and heat it by radiation.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-mentioned configuration, if the temperature (evaporation temperature) of the indoor surface heat exchanger is lowered and even dehumidification is performed during cooling, the surface heat exchanger for treating dehumidified water. In addition to tilting the pipe, large-scale construction such as drain piping is required.
In addition, if the temperature of the indoor surface heat exchanger is not increased to prevent dehumidification (sensible heat exchange), an enormous heat transfer area is required, a large indoor surface heat exchanger is required, and the humidity does not drop. There was a problem that steamy heat remained and the cooling feeling disappeared.

In view of the above-mentioned problems, the present invention provides a comfortable air-conditioning system in which dehumidification and air-conditioning by radiation are successfully combined and a feeling of airflow is small.

Means for Solving the Problems To solve the above problems, the air conditioner of the present invention is
Between a compressor, a four-way valve, an outdoor heat exchanger, an outdoor unit equipped with an outdoor expansion valve and one or more indoor surface heat exchangers, a dehumidifying heat exchanger, a pressure reducing valve, a two-way valve, A dehumidifying unit including an expansion valve is provided, and the compressor, the four-way valve, the outdoor heat exchanger, the outdoor expansion valve, the expansion valve, the indoor surface heat exchanger, the pressure reducing valve, the dehumidifying heat exchanger. Are sequentially connected in an annular shape, and the two-way valve is arranged in parallel to the one in which the pressure reducing valve and the dehumidifying heat exchanger are connected in series.

Effect The present invention has the above-described configuration to divide the evaporation temperature of the refrigeration cycle into two temperatures during cooling, raise the evaporation temperature of the indoor surface heat exchanger to a level not dehumidified, perform radiant cooling, and perform dehumidifying unit indoor operation. By reducing the evaporation temperature of the heat exchanger with the pressure reducing valve for dehumidification, it is possible to realize a comfortable air-conditioning operation with a small feeling of air flow.

Embodiment An air conditioner according to an embodiment of the present invention will be described below with reference to the drawings. The same components as those of the related art will be designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 1 is a refrigeration cycle diagram of an air conditioner according to an embodiment of the present invention. Dehumidifying unit 9 is a dehumidifying heat exchanger
11, a pressure reducing valve 12, a two-way valve 13, and an expansion valve 14, and are arranged between the indoor surface heat exchangers 10a to 10c arranged in parallel with the outdoor unit 7. Then, the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the outdoor expansion valve 4, the expansion valve 14, the indoor surface heat exchangers 10a ~ 10c,
Pressure reducing valve 12, dehumidifying heat exchanger 11, four-way valve, accumulator 5
Are sequentially connected in an annular shape, and the two-way valve 13 is arranged in parallel with the pressure reducing valve 12 and the dehumidifying heat exchanger 11 connected in series to form a refrigeration cycle.

The operation of the air conditioner configured as described above will be described below.

During cooling (solid arrow), the high-temperature high-pressure refrigerant compressed by the compressor 1 is condensed and liquefied by the outdoor heat exchanger 3 via the four-way valve 2, and expanded by the expansion valve 14 of the dehumidifying unit 9 via the outdoor expansion valve 4. Is decompressed, and the interior surface heat exchangers 10a to 10c evaporate and evaporate by the amount of sensible heat exchange capacity. The decompression unit 12 further reduces the pressure, and the dehumidifying heat exchanger 11 evaporates and evaporates and Return to the compressor 1 via the valve 2 and the accumulator 5. At this time, the two-way valve 13 of the dehumidifying unit 9 is fully closed. FIG. 2 shows a cycle on the Mollier diagram during the cooling operation.

Next, at the time of heating (dashed line arrow), the high-temperature high-pressure refrigerant compressed by the compressor 1 is condensed by the indoor surface heat exchangers 10a to 10c via the four-way valve 2 and the two-way valve 13 of the dehumidifying unit 9. Liquefaction,
The pressure is reduced by the outdoor expansion valve 4 via the expansion valve 14, evaporated and vaporized by the outdoor heat exchanger 3, and then the four-way valve 2 and the accumulator 5 are used.
Return to the compressor 1 via.

As described above, according to the present embodiment, the outdoor unit 7 including the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, and the outdoor expansion valve 4, and the plurality of indoor surface heat exchangers 10a to 10c. In the meantime, the dehumidifying heat exchanger 11,
A dehumidifying unit 9 including a pressure reducing valve 12, a two-way valve 13, and an expansion valve 14 is provided, and a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an outdoor expansion valve 4, an expansion valve 14, an indoor surface heat exchanger are provided. 10a to 10c, the pressure reducing valve 12, the dehumidifying heat exchanger 11, the four-way valve 2, and the accumulator 5 are sequentially connected in an annular shape, and the pressure reducing valve 12 and the dehumidifying heat exchanger 11 are connected in series to each other in parallel. By arranging the one-way valve 13, not only comfortable radiant heating without feeling of air flow at the time of heating but also dividing the evaporation temperature of the refrigeration cycle into two temperatures during cooling, dehumidifying the evaporation temperature of the indoor heat exchanger It is possible to realize a comfortable air-conditioning operation with a small feeling of airflow by raising the temperature to the extent that does not occur, performing radiant cooling, and lowering the evaporation temperature of the indoor heat exchanger of the dehumidifying unit with a pressure reducing valve to perform dehumidification.

As described above, according to the present invention, the dehumidifying heat is provided between the outdoor unit including the compressor, the four-way valve, the outdoor heat exchanger, and the outdoor expansion valve, and one or more indoor surface heat exchangers. A dehumidifying unit including an exchanger, a pressure reducing valve, a two-way valve, and an expansion valve is provided, and the compressor,
The four-way valve, the outdoor heat exchanger, the outdoor expansion valve, the expansion valve, the indoor surface heat exchanger, the pressure reducing valve, the dehumidifying heat exchanger are sequentially connected in an annular shape, and the pressure reducing valve and the dehumidifying valve are connected. By arranging the two-way valve in parallel with the one connected in series with the heat exchanger, not only radiant heating without a feeling of airflow during heating but also evaporation temperature of the refrigeration cycle during cooling is 2 temperature. By increasing the evaporation temperature of the indoor heat exchanger to a level that does not dehumidify it, performing radiant cooling, and lowering the evaporation temperature of the indoor heat exchanger of the dehumidifying unit with a decompression valve, dehumidification is achieved. It is possible to realize cooling operation with a small air flow feeling.

[Brief description of the drawings]

FIG. 1 is a refrigeration cycle diagram of an air conditioner in one embodiment of the present invention, FIG. 2 is a Mollier diagram during the cooling operation, and FIG. 3 is a refrigeration cycle diagram of a conventional air conditioner. 7 ... Outdoor unit, 9 ... Dehumidifying unit, 10a-10c ... Indoor surface heat exchanger, 11 ... Dehumidifying heat exchanger, 12 ... Decompressor.

Claims (1)

(57) [Claims] 1. A dehumidifying heat exchanger and a pressure reducing valve between an outdoor unit equipped with a compressor, a four-way valve, an outdoor heat exchanger, and an outdoor expansion valve, and one or more indoor surface heat exchangers. A dehumidifying unit provided with a two-way valve and an expansion valve, the compressor, the four-way valve, the outdoor heat exchanger, the outdoor expansion valve, the expansion valve, the indoor surface heat exchanger, the pressure reducing valve, An air conditioner characterized in that the dehumidifying heat exchangers are sequentially connected in an annular shape, and the two-way valve is arranged in parallel with the decompression valve and the dehumidifying heat exchanger connected in series.