Automotive Air Conditioning Pressure & temperature relationship

Automotive
Air Conditioning
Pressure & temperature relationship




Evaporation:

Is the term used when enough heat is added to a liquid substance to change it into a vapor (gas). For example, when water is boiled.This condition occurs within the A/Csystem.
 
Evaporation

Condensation:

Is the term used to describe the opposite of the evaporation process. If you take a vapor and remove enough heat from it, a change of state occurs.The vapor becomes a liquid.  The change of vapor to a liquid is called condensation. This condition occurs within the A/C system.

Condensation



Freezing:
Is another change of state. Freezing results when heat is removed from a liquid substance until it becomes a solid. Remember that anything above -273 C still contains some heat. In an air conditioning system freezing must be avoided. Otherwise component damage will occur.

Freezing


Pressure & temperature relationship:

point of a substance

To increase or decrease the boiling point of a substance, we must alter the pressure on
the substance. Increasing the pressure increases the boiling point.To decrease the boiling point, decrease the pressure.

The pressure




A good example is the automotive cooling system. The pressure cap keeps the radiator from
boiling over by increasing the pressure on the coolant.

Example:
110 kPa radiator cap allows the coolant  temperature to reach 126 C before boiling.
boiling point of water


This chart opposite shows that the boiling point of water can be altered by changing the pressure upon it. As a comparison with the radiator example above. The substance used in the air conditioning system, called refrigerant, also boils at different temperatures depending on the pressure that it is under.


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