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1) Most hermetic compressors are cooled by the suction gas. If there is an undercharge, there will be an undercooling (or overheating) of the motor.

2) Ambient air is used to cool the air in the fan department.

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How do you convert heat energy to mechanical?

In some refrigeration systems, mechanical energy is converted to heat energy by mechanically compressing a refrigerant, by means of a compressor; and since refrigerants have a fixed pressure-temperature relationship, much like saturated steam, altering the pressure of a refrigerant correspondingly alters its temperature. I've read of other methods utilizing friction, which is itself mechanical energy in the more pure and direct sense rather than the operation of a mechanical device which itself is utilizing electrical energy, but the compressor example is the only practical real-world application of this nature in common, everyday use that I can think of.


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