How does dichlorodifluoromethane help to keep the temperature in a refrigerator down to freezing temperature?

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All refrigerants remove and reject heat in the same way they just do so at different temperature and pressure relationships, for example, water at sea level "boils" or changes state at or above 212F, we can control the boiling point by adding or reducing the pressure exerted upon it. Water in a 30" vacuum will "boil" at room temperature. We can increase the boiling point or temperature by increasing pressure above ambient which is how an autiomotive radiator operates, the radiator cap holds 3 to 12 lbs of pressure and this determines the boiling point. Refrigeration works this same way, R 22 refrigerant at 70 psi will always be at 40F and above or below t will boil or condense. Refrigerant "boils" to remove heat and "condenses" to reject the heat outdoors.

At what temperature is it necessary to turn on the pump to keep pipes from freezing?

You answered you own question: at freezing. At or near 32 degrees F your pump should be turned to keep water moving. moving water doesn't freeze. It is important that any expo

How does freon help to keep the temperature in a refrigerator down to keep the to freezing temperature?

The refrigerant itself doesn't do all of the work... heat and humidity is also drawn out of the passenger compartment by components of the AC system. In a nutshell, the refrig