Volkswagen Touran Service Manual: Physical Principles

Volkswagen Touran Service Manual / Heating, Ventilation and Air Conditioning / A/C System, General Information / A/C Technology Basic Principles / Physical Principles

The four known states of water also apply to air conditioning system refrigerants.

1 -	gaseous (invisible)

2 -

vapor

3 -

fluid

4 -

solid

When water is heated in a vessel (heat absorption), water vapor can be seen to rise. If the vapor is further heated through heat absorption, the visible vapor turns into invisible gas. The process is reversible. The warmth is extracted from gaseous water, vapor forms first, then water and then ice.

A -	Heat absorption

B -	Heat emission

Heat Transfer

Every substance consists of a mass of moving molecules. The fast moving molecules of a warmer substance give off some of their energy to the cooler and thus slower molecules. As a result, the molecular motion of the warmer substance slows down and that of the colder substance is accelerated. This process continues until the molecules of both substances are moving at the same speed. They are then at the same temperature and no further heat exchange takes place.

A/C Technology Basic Principles

...

Pressure and Boiling Point

The boiling point given in tables for a liquid is always referenced to an atmospheric pressure of 1 bar (14.5 psi). If the pressure acting on a fluid changes, its boi ...

Other materials:

Volkswagen Touran Owners Manual. Locking and unlocking the vehicle from outside
Fig. 22 Buttons in the vehicle key First read and observe the introductory information and safety warnings Function Buttons to be used in the vehicle key Action carried out with key in the lock cylinder Remove the cover of the lock ...

Volkswagen Touran Owners Manual. Information on steering
First read and observe the introductory information and safety warnings The steering should be locked every time you leave vehicle to make it more difficult for break-ins to occur. Mechanical steering column lock Activating the steering lock Deactivating the s ...