[Jack21]

A refrigeration system is much like a cooling system in that it moves heat from one place to another. In a cooling system, the heat exchange media is water and glycol, and it stays a liquid. A refrigeration system uses a refrigerant (R-12, R-134a) that changes state from a liquid, to a gas, to a liquid again while giving up, or removing heat in the process.

When you get out of the shower, your skin gets cold. The water is evaporating (changing from a liquid to a vapor) and removing heat in the process.

Your auto refrigerator consists of 5 main parts, compressor, condenser, evaporator, drier, pressure switch. The compressor takes low pressure gas, and compresses it into a high pressure gas. High pressure gas enters the condenser where it gives up heat to the air and condenses into a liquid. The liquid enters the evaporator through a small opening where it evaporates, changes state from a liquid to a gas, and removes heat in the process. A drier is used to remove any water vapor and other contaminants that may have inadvertently entered the refrigerant, and also acts as a refrigerant reservoir. The drier also typically incorporates a high and low pressure safety and cycling switch.

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