What is heat & how did it works to the refrigeration cycle?
Heat/energy is the ability to do work (standard physics definition, sorry). In a refrigeration cycle, heat is absorbed from the inside of the refrigerator (the cool side) and then expelled outside of the refrigerator (the hot side). Heat is transferred via a liquid coolant that is repeatedly evaporated (during which it absorbs heat) and then condensed (during which it gives off heat). The coolant is fed via a pump or motor to the cool side of the cycle (again, this is the inside of the refrigerator). The coolant evaporates and in doing so absorbs a bunch of heat (heat of vaporization), thus cooling the inside of the refrigerator. The expanded coolant then flows to the hot side of the refrigerator where a compressor increases the coolant’s pressure. The coolant condenses as a result, releasing heat (heat of condensation) in the process. This is why the back of a refrigerator (where the coils are) is usually warm. The liquid coolant then flows back to the pump and is fed back into the cy
