What is the role of refrigeration compressor in refrigeration system?

What is the role of refrigeration compressor in refrigeration system? The simplest and most popular explanation is that the refrigeration system uses the phenomenon that the refrigerant evaporates and condenses at different pressures to achieve refrigeration. It condenses at a higher temperature at high pressure and evaporates at a lower temperature at low pressure. The compressor is the equipment that provides this pressure difference, which is important Equivalent to the heart of the refrigeration system. Take the automobile air conditioning system, compressor-condenser-expansion valve-evaporator-compressor, this is a cycle. The compressor sucks the low-temperature and low-pressure steam from the evaporator (guaranteeing the evaporation pressure in the evaporator), and makes it a high-temperature and high-pressure gas by doing work (volume change work), the pressure increases, and the condensation temperature will also increase accordingly, so R134a It is also easier to condense into liquid, thus completing a refrigeration cycle. For a refrigeration cycle system, heat source/cold source, working medium (that is, refrigerant R134a), volume change work (compressor) are indispensable. Without a compressor, it actually violates the second law of thermodynamics, and heat will not spontaneously transfer from a low-temperature object to a high-temperature object.

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