| 摘要 |
PROBLEM TO BE SOLVED: To prevent the retention of refrigerator oil in an evaporator. SOLUTION: An oil repellent film 31a is formed on the internal wall of a tube 31. The retention of refrigerator oil at the evaporator 30 can thereby be suppressed, so that a sufficient quantity of refrigerator oil can be returned to a compressor to prevent the occurrence of defectiveness such as seizure of the compressor. Since the retention of refrigerator oil at the evaporator 30 can be suppressed, the reduction of substantial refrigerant passage cross-sectional area of the tube 31 is prevented while preventing a lowering of a heat transfer rate between a refrigerant and the tube 31. An increase in pressure loss at the evaporator 30 can thereby be prevented to improve heat absorption capacity at the evaporator 30. COPYRIGHT: (C)2003,JPO
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