REFRIGERANT SYSTEM

id071100700300


Outline

•  The refrigerant system cools (dehumidifies) the evaporator using the cooling control of the heat pump system to cool and dehumidify the air passing through the evaporator.

Function

•  The refrigerant system changes the pressure and temperature of the charged refrigerant and cools the evaporator at the refrigerant cycle in which the refrigerant is liquefied or atomized.

Structural view

L.H.D.

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R.H.D.

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Operation

1.  The electric compressor operates by turning on the A/C switch of the climate control unit to compress refrigerant. (1)

2.  The electric compressor discharges the high temperature, high pressure gaseous refrigerant, and it is sent to the cabin condenser. (2)

3.  The high temperature, high pressure gaseous refrigerant is circulated inside the tube in the cabin condenser. (3)

4.  The high temperature, high pressure gaseous refrigerant is sent to the 2way valve for refrigerant. (4)

5.  Because the 2way valve for refrigerant is off (open) during cooling (dehumidifying) control, it is sent to the condenser passing through the 2way valve for refrigerant. (5)

6.  When the airflow from the exterior contacts the condenser fins, the heat in the circulating refrigerant is released through heat exchange (heat radiation). As a result, the high temperature, high pressure gaseous refrigerant becomes a high temperature, high pressure liquid refrigerant. (6)

7.  The high temperature, high pressure liquid refrigerant is circulated inside the tube in the condenser and it is sent to the 3way valve for refrigerant. (7)

8.  Because the 3way valve for refrigerant is on (electric expansion valve side: open), the high temperature, high pressure liquid refrigerant is sent to the electric expansion valve. (8)

9.  The high temperature, high pressure liquid refrigerant is depressurized by the electric expansion valve and becomes the low temperature, low pressure atomized liquid refrigerant. (9)

10.  The low temperature, low pressure atomized liquid refrigerant is sent to the evaporator. (10)

11.  The low temperature, low pressure atomized liquid refrigerant is atomized in the evaporator by heat exchange (heat radiation) and becomes a low temperature, low pressure gaseous refrigerant. In addition, the evaporator is cooled by the surrounding heat being drawn out (latent heat) when the liquid is atomized. (11)

12.  The low temperature, low pressure gaseous refrigerant is sent to the accumulator. (12)

13.  To avoid liquid refrigerant from flowing into the electric compressor, gaseous refrigerant and liquid refrigerant are separated by the accumulator to temporarily store liquid refrigerant. (13)

14.  The low temperature, low pressure gaseous refrigerant is sent to the electric compressor and circulates the refrigerant cycle. (14)

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15.  The airflow passing through the cooled evaporator is cooled via heat exchange, the moisture in the air is condensed in the evaporator, and dehumidified.

16.  The cooling in the vehicle is performed by passing airflow from the blower fan through the cooled evaporator.

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