| 摘要 |
PROBLEM TO BE SOLVED: To enhance the refrigeration capacity while suppressing degradation of the coefficient of performance. SOLUTION: The sectional area of a refrigerant passage of first headers 5c and 5e is reduced toward a distal side from a refrigerant inlet. When the refrigerant flow rate is small, much of the low-pressure refrigerant flows in the left end side, and much of the high-pressure refrigerant flows in the right end side. When the refrigerant flow rate is large, much of the low-pressure refrigerant flows close to the right from the left end side, and much of the high-pressure refrigerant flows close to the left side from the right end side. Thus, in a low load condition with small refrigerant flow rate, the heat exchange quantity by an internal heat exchanger 5 is reduced, heating of the low-pressure refrigerant is suppressed, the enthalpy (temperature) of the high-pressure refrigerant is dropped while minimizing the degradation of the coefficient of performance, and the refrigeration capacity generated in an evaporator is enhanced. In addition, in a high load condition with large refrigerant flow rate, the heat exchange quantity in the internal heat exchanger 5 is enhanced, and the refrigeration capacity generated in the evaporator can be enhanced. COPYRIGHT: (C)2004,JPO
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