| 摘要 |
PURPOSE:To adequately control the heat transfer area of a heat exchanger even when the capacity of a condenser relatively increases in an excess due to a low outdoor temperature, by a method wherein at least one refrigerant flow control valve is provided on one of or both of headers of the heat exchanger, and the number of refrigerant passes is changed to change the effective heat transfer area of the heat exchanger corresponding to the outdoor temperature. CONSTITUTION:A first partition plate 36a and a second partition plate 36b are respectively installed in an inlet header 30a and an outlet header 30b so as to isolate refrigerant passes in the headers from each other, and first and second refrigerant flow control valves 35a and 35b are provided on the partition plates, which open or close the isolated refrigerant flow passes. When the first and second refrigerant flow control valves 35a and 35b are closed, the refrigerant gas flowing into the inlet header through a refrigerant inlet 33 passes through A portion of heat transfer pipes 31 and flows into the outlet header 30b while it is cooled. The refrigerant makes a U turn in the outlet header, passes through B portion of the heat transfer pipes 31 while it is condensed into liquid and flows into the inlet header 30a again. Then, the refrigerant makes a U turn again and flows out from a refrigerant outlet 34 after passing through C portion of the heat transfer pipes 31 while it is liquefied and cooled.
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