VW Polo manuals

Volkswagen Polo Service & Repair Manual: 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 boiling point also changes.
For example, water boils at a lower temperature the lower the pressure.
The vapor pressure curves for water and refrigerant R134a show that, at constant pressure, reducing the temperature changes vapor to liquid (in the condenser) or that reducing the pressure causes the refrigerant to change from liquid to vapor (evaporator).
Vapor pressure curve of water
A -  fluid
B -  Gaseous
C -  Vapor pressure curve of water
1 -  Pressure acting on liquid in bar (psi)
2 -  Temperature in °C (°F)

Pressure and Boiling Point

Vapor pressure curve of refrigerant R134a
A -  Fluid
B -  Gaseous
D -  Vapor pressure curve of refrigerant R134a
1 -  Pressure acting on liquid in bar (psi)
2 -  Temperature in °C (°F)

Pressure and Boiling Point

Physical Principles
The four known states of water also apply to air conditioning system refrigerants. 1 -  gaseous (invisible) 2&n ...

Refrigerant R134a Vapor Pressure Table
The vapor pressure table for every refrigerant is published in literature for refrigeration system engineers. This table makes it possible to determine the vapor pres ...

Other materials:

Front view
Fig. 2 Overview of the front of the vehicle Key for : Rain/light sensor on the mirror base Windscreen Windscreen wiper Bonnet Bonnet release lever Headlights Headlight washer system Mounting for the front towing eye behind a cover Front number plate holder F ...

ACC - Adaptive Cruise Control
  Note On vehicles with ACC, the trim in the right cover section of the front bumper must not be painted if paint repairs or component replacements are performed. The ACC system is located behind this section therefore a coat of paint would ...

Cigarette Lighter Socket, Removing and Installing
Special tools and workshop equipment required Cigarette Lighter Release Tool -T40148-   Note The removal and installation for all sockets is performed in the same way and is only described for the ciga ...

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