Refrigeration technology for air conditioning belongs to the ordinary refrigeration range, mainly using liquid gasification refrigeration. (Mainly, the liquid gasification process is to absorb the heat of the submerged central air conditioner, and the liquid pressure is different, the boiling point is also different, the lower the pressure, the lower the boiling point.) According to different ways of heat transfer from high temperature objects to low temperature objects, It is: vapor compression refrigeration, absorption refrigeration.
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