A refrigerating system for freezing fish products using two evaporating temperatures is discussed in detail by means of theoretical analysis, calculation and consideration of operating effects.

With a designed supercooled-water ice making system test-bed, carries out grouping experiments for different evaporating temperatures and water flow rates.

Some researches in an ice harvester machine are made which indicate that the evaporating temperature is the most significant factor which influence the COP (Coefficient of Performance) of a refrigeration compressor while both the evaporating temperature and the condensing temperature are two main factors.

Analysis of influence of adjustment of expanding valve and variation in evaporation temperature on dehumidification efficiency;

Experiments on defrosting control based on exhaust fan current combined with evaporation temperature;

The condensation temperature and evaporation temperature are variational in condensator and evaporator using R22/R142b non-azeotropic mixture refrigerant.