| 摘要 |
A refrigeration system has a compressor operable to supply relatively hot compressed refrigerant gas, a condenser to liquify the relatively hot compressed refrigerant gas from the compressor, a thermostatic expansion (TX) valve to vaporize liquified refrigerant from the condenser, an evaporator to cool the surrounding atmosphere by vaporized refrigerant from the TX valve, a superheat sensor to improve control of the TX valve, a compressor discharge line to convey relatively hot compressed refrigerant gas from the compressor to the condenser, a liquid line to convey liquified refrigerant from the condenser to the TX valve, and a suction line including the superheat sensor to convey vaporized refrigerant from the evaporator to the compressor. A liquid refrigerant stabilizer in the liquid line and the suction line is operable to convey liquid refrigerant in the liquid line and vaporized refrigerant in the suction line in heat exchange relationship with each other to cause liquid refrigerant in the liquid line to be cooled by suction refrigerant in the suction line. A de-frost valve assembly is operable to effect de-frosting by shutting off flow of liquid refrigerant from the condenser and substituting a flow of relatively hot compressed refrigerant gas from the compressor to cause the relatively hot compressed refrigerant gas to flow in the liquid line through the stabilizer to the TX valve and the evaporator to defrost the evaporator and return through the suction line through the stabilizer to the compressor. The stabilizer functions as a vaporizer during a de-frost cycle with the relatively hot compressed refrigerant gas in the stabilizer-vaporizer being in heat exchange relationship with vapour in the suction line passing from the evaporator through the stabilizer-vaporizer to the compressor.
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