Air conditioning refrigerant selection principle

selection principle in vapor compression machine, refrigerant selection in addition to good thermal properties and physical and chemical properties, should have good environmental characteristics. Specific requirements are as follows: ( 1) No damage on human ecological environment. Don't destroy the atmospheric ozone layer, do not produce the greenhouse effect. （ 2) Critical temperature is higher. Can be liquefied under normal temperature or low temperature. Hope critical temperature is much higher than the environment temperature, in order to reduce refrigerant throttling loss, improve the circulation economy. （ 3) In working temperature range, with appropriate saturated steam pressure, evaporation pressure at least shall not be lower than the atmospheric pressure, so as to avoid external air infiltration in the system; Condensing pressure is unfavorable and exorbitant, otherwise it will cause the compressor power consumption to increase, and demanded that the system has high bearing capacity, increase equipment costs. （ 4) Unit volume refrigerating capacity is big. Can reduce the compressor capacity. （ 5) Viscosity and density is small. Reduce the flow resistance loss in the system. （ 6) High thermal conductivity. Can improve the heat transfer coefficient of heat exchanger, heat transfer area to reduce material consumption reduce heat exchange equipment. （ 7) Not burning, not explode, non-toxic. No corrosion of metal materials, the lubricating oil is not happening chemistry, high temperature decomposition. （ 8) Such as entropy index is small. Can reduce exhaust temperature, reduce the compression process work, good safety running and improve the service life. （ 9) The solidification temperature is low. Avoid in the evaporation temperature solidification. （ 10) With good insulation performance. （ 11) Low prices accessible. （ 12) Small unit volume compression work.

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