Four Physical Laws to remember :

1. Heat will always travel from hot to cold.

2. Heat is rejected when changing from gas to the liquid state (At constant temperature and pressure). This is called condensation.

3. Heat is absorbed when changing from the liquid to the gas state. (At a constant temperature and pressure). This is called evaporation.

4. Evaporation and condensation temperature will change when pressure changes.

 

Technically spoken, an AC system does not produce cold air, it absorbs heat (cold is an absence of heat). By evaporating a liquid (refrigerant) in the car’s interior, heat is absorbed. The evaporated refrigerant is then transported to the engine compartment where it, after a pressure increase, condenses. During this condensation it rejects the stored heat. (which was absorbed in the interior).

After condensation, the liquid refrigerant travels to the interior compartment where it, after a pressure drop, evaporates. The whole process starts again.

Compressor

Condenser

Evaporator

Expansion valve

Receiver Drier

Tel : 01993 841810

Fax : 01993 841810

Email : acreair@tiscali.co.uk