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 |
| C - |
Vapor pressure curve of water |
| 1 - |
Pressure acting on liquid in bar (psi) |
| 2 - |
Temperature in °C (°F) |
|
|
|
| Vapor pressure curve of refrigerant R134a |
| D - |
Vapor pressure curve of refrigerant R134a |
| 1 - |
Pressure acting on liquid in bar (psi) |
| 2 - |
Temperature in °C (°F) |
|
|
|
The four known states of water also apply to air
conditioning system refrigerants.
1 -
gaseous (invisible)
2&n ...
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:
Antenna Wires, Repairing
Aerial Cable Repair Set -VAS6720
Special tools and workshop equipment
required
Repair Set, Aerial Cable -VAS6720-
Checking the Antenna Wire. Refer to
Replacing the Tool Head. Refer to
...
Introduction
This chapter contains information on the following subjects:
→ Fuses in the vehicle
→ Changing a blown fuse
At the time of print we are unable to provide an up-to-date overview of the
locations of the fuses for the electrical consumers. This is because the vehicle
is under co ...
Accessories and parts
First read and observe the introductory information
and safety warningsVolkswagen recommends that you seek advice from a Volkswagen
dealership before purchasing accessories, spare parts or service fluids. For example,
if the vehicle is to be retrofitted with accessories or if parts have to be ...
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Physical Principles
Refrigerant R134a Vapor Pressure Table