Volkswagen Workshop Service and Repair Manuals > Polo Mk4 > Heating, ventilation, air conditioning | Air conditioning with refrigerant R134a | Technical data | General information on air conditioning | Basics of air conditioning

Heat is always transferred from a warmer material to a cooler one. > < Basics of air conditioning

Physical principles:

The four known states of water also apply to refrigerant gas in air conditioning systems.

1 -

Gas

2 -

Vapor

3 -

Liquid

4 -

Solid

If water is heated in a container (energy absorption), the steam produced is a vapor and if it continues to absorb thermal energy, it becomes gas. The process is reversible. If we subtract energy from water in a gaseous state, we obtain, in sequence, vapor, water and ice.

A -	Energy absorption

B -	Energy release

Heating, ventilation, air conditioning
Air conditioning with refrigerant R134a / Technical data / General information on air conditioning / sics_of_air_conditioning/">Basics of air conditioning
Physical principles:

Heat is always transferred from a warmer material to a cooler one. > < Basics of air conditioning

Volkswagen Workshop Service and Repair Manuals

Polo Mk4

Heating, ventilation, air conditioning Air conditioning with refrigerant R134a / Technical data / General information on air conditioning / sics_of_air_conditioning/">Basics of air conditioning Physical principles:

Heating, ventilation, air conditioning Air conditioning with refrigerant R134a / Technical data / General information on air conditioning / sics_of_air_conditioning/">Basics of air conditioning Physical principles:

Heating, ventilation, air conditioning
Air conditioning with refrigerant R134a / Technical data / General information on air conditioning / sics_of_air_conditioning/">Basics of air conditioning
Physical principles:

Heating, ventilation, air conditioning
Air conditioning with refrigerant R134a / Technical data / General information on air conditioning / sics_of_air_conditioning/">Basics of air conditioning
Physical principles: