TRG-TRC003-EN 1
notes
period one
Heat and Refrigeration
Before discussing the refrigeration system, we need to understand the terms
heat and refrigeration.
The term refrigeration is commonly associated with something cold. A
household refrigerator, for example, keeps food cold. It accomplishes this task
by removing heat from the food. Therefore, refrigeration involves the removal
of heat. The word cold describes a state of low heat content.
To understand how refrigeration works, we first need to understand what heat
is and how it is removed from a substance.

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