| 摘要 |
PURPOSE: A defrosting system using an air cooling type refrigerant evaporating condenser is provided to defrost frost generated in an evaporator without a separate heater and to steadily maintain temperature and pressure of refrigerant flowing into a compressor. CONSTITUTION: A defrosting system using an air cooling type refrigerant evaporating condenser comprises a compressor(10), a condenser(20), expansion valves(30,35), and an evaporator(40). The condenser forms an air cooling type evaporating condenser. The air cooling type evaporating condenser comprises a pair of heat exchangers arranged in a line. The heat exchangers are arranged to be heat exchanged with an external air heat source by a cooling pan. A refrigerant flow path where refrigerant passed the air cooling type evaporating condenser flows comprises a pair of divaricate refrigerant flow paths. A first electric valve and a first expansion valve are arranged in a consecutive order from an upstream side to a downstream side of the flow in one refrigerant flow path. A second electric valve is arranged in the other refrigerant flow path. A refrigerant flow path, where refrigerant discharged from the evaporator flows, comprises a pair of divaricate refrigerant flow paths. One of divaricate refrigerant flow paths is connected to an inlet of the compressor and comprises a third electric valve. The other divaricate refrigerant flow path is connected to the air cooling type evaporating condenser through a fourth electric valve and the second expansion valve.
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