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). |
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| 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:
Capacities
First read and observe the introductory information
and safety warnings
Fuel tank capacity
Petrol and diesel engines
approx 45.0 l,
of which approx. 7.0 l reserve.
Autogas engine a)
Autogas: approx. 52 l
pet ...
Introduction
When the outside temperature is low, the display in the instrument cluster
may take slightly longer to appear than it does when the outside temperatures is
higher.
Additional information and warnings:
Warning and indicator lamps
Volkswagen information system
Selected gear di ...
MFD (multifunction display) menu
First read and observe the introductory
information and safety warnings
The multifunction display (MFD) is equipped with two automatic memories:
1 - Trip memory and 2 - Total journey memory.
The number of the current memory on display will be shown in the upper
right-hand corner of the displ ...
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Physical Principles
Refrigerant R134a Vapor Pressure Table