36 TRG-TRC003-EN
notes
period five
Review

Period Two discussed refrigerants and how they are used in the process of

removing and transporting heat.

Remember that refrigerants absorb significant amounts of heat when they

change phase (e.g., from a liquid to a vapor). Chemical refrigerants commonly

evaporate at low temperatures when exposed to atmospheric pressure.

Because of their cost and impact to the environment, however, refrigerants

must be recovered in a closed system.

Period Three presented the basic vapor-compression refrigeration cycle, and

specifically the use of a compressor, condenser, and expansion device to

“recover” the evaporated refrigerant and complete the cycle. The primary

components of the vapor-compression refrigeration cycle include the

evaporator, compressor, condenser, and expansion device.

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