2) refrigeration agent is due stronger heat exchange performance, change in order to raise refrigeration heat implement efficiency.
3) the water imbibition with refrigeration due and regular dose. Such, when a few moisture are entered in refrigeration system, do not send form “ to put a ” on the ice, the influence moves normally.
4) refrigeration agent should have chemical stability, do not burn inside limits of actuating pressure, temperature, do not explode, high temperature falls to be not decomposed, do not corrode refrigeration equipment, to sealed material deliquescent, expand effect is little, do not have chemical reaction with lube.
5) requirement refrigeration agent is harmless to the health of human body, without stimulative effect, live to the mankind the environment is not had destroy effect apparently, ozone destroys potential to be worth (ODP is worth) reach global warmth to change potential to be worth (GWP is worth) should small. Global warmth changes potential value to call the earth greenhouse effect again.
3, the requirement of economy respect:
Ask those who make cryogen is low-cost, purchase easily.


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