Air conditioners and refrigerators commonly used refrigerants have? How to choose
refrigerator common refrigerant R12, the main, R600, R152, R22 azeotropic commonly used air conditioning refrigerant R22, new refrigerant R410A refrigerant is also called refrigerating agent, on the south side of some areas known as snow. It is a cycle in the refrigeration system and through its own state changes to complete refrigeration work material. Refrigerant in the evaporator absorbed by the cooling medium ( With air or water, etc. ) Heat and evaporation, in the heart of the condenser heat transfer to the surrounding air or water and condensation. Refrigerant selection is a complex skill economic problems, needs to consider the elements of many, should according to the specific situation, when choosing a comprehensive skills. Refrigerant selection criteria: in steam tightening machine, in addition to have good thermal properties and physical and chemical properties, more should have good environmental characteristics. Specific requirements are as follows:
( 1) No damage effect on human ecological environment. Don't damage the atmospheric ozone layer, the greenhouse effect does not occur.
( 2) Critical temperature is higher. In normal temperature or low temperature can be liquefied. Hope to critical temperature is much higher than the environment temperature, lost ability to reduce refrigerant, forward circular economy.
( 3) In working temperature range, with appropriate saturated steam pressure, evaporation pressure at least shall not be lower than the atmospheric pressure, avoid outside air into the system; Condensing pressure is unfavorable and exorbitant, otherwise it will cause tightening machine power consumption to increase, and demanded that the system has the high pressure ability, increase the capital equipment.
( 4) Unit volume refrigerating capacity is big. Can reduce the tightening machine capacity.
( 5) Viscosity and density is small. Reduce resistance lose activity in the system.
( 6) High thermal conductivity. Can get in the way of heat exchanger heat transfer coefficient, decrease the heat transfer area to reduce heat exchange equipment materials consumption.
( 7) Not burning, not blasting, non-toxic. No corrosion of metal materials, the lubricating oil is not happening chemistry, high temperature is not divided.
( 8) Such as entropy index is small. Can reduce exhaust temperature, reduce the tightening process work, good work safety and service life.
( 9) Condensing temperature is low. To avoid condensation of evaporation temperature appear.
( 10) Have excellent insulation function.
( 11) Low prices accessible.
( 12) Small unit volume contraction work
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