Volkswagen Golf Service & Repair Manual: Vapour pressure table for refrigerant R134a
| The vapour pressure table for each refrigerant is published
in the literature for refrigeration engineers. This table shows
the vapour pressure exerted on the liquid column in the
container for a given temperature of the container. |
| Since a characteristic vapour pressure table is known for
every refrigerant, one can determine what refrigerant is present
by measuring pressure and temperature. |
 Note
| Absolute pressure means that 0 bar corresponds to an
absolute vacuum. The normal ambient pressure (positive pressure)
corresponds to 1 bar absolute pressure. On most pressure gauges,
a reading of 0 bar corresponds to an absolute pressure of one
bar (which is confirmed by the existence of a -1 bar marking
beneath the 0 scale marking). |
|
|
|
|
Temperature in °C |
Pressure in
bar (positive pressure) R134a |
| -45 |
-0.61 |
| -40 |
-0.49 |
| -35 |
-0.34 |
| -30 |
-0.16 |
| -25 |
0.06 |
| -20 |
0.32 |
| -15 |
0.63 |
| -10 |
1.00 |
| -5 |
1.43 |
| 0 |
1.92 |
| 5 |
2.49 |
| 10 |
3.13 |
| 15 |
3.90 |
| 20 |
4.70 |
| 25 |
5.63 |
| 30 |
6.70 |
| 35 |
7.83 |
| 40 |
9.10 |
| 45 |
10.54 |
| 50 |
12.11 |
| 55 |
13.83 |
| 60 |
15.72 |
| 65 |
17.79 |
| 70 |
20.05 |
| 75 |
22.52 |
| 80 |
25.21 |
| 85 |
28.14 |
| 90 |
31.34 |
The boiling points given in the table below are always based
on an atmospheric pressure of 1 bar. If the pressure on a liquid
is changed, its boiling point changes al ...
Air conditioners in vehicles use the evaporation and
condensation process. The system contains a liquid with a low
boiling point, called the refrigerant.
...
Other materials:
Controls for the heating and fresh air system
Fig. 183 In the centre console: controls
for the heating and fresh air system
First read and observe the introductory information
and safety warnings
Button, control
Additional information. Heating and fresh air system
Temperature ...
Lights, lamps, switches outside
Operation and safety notes for gas
discharge bulbs
–
If repairs are to be made to the headlight with gas
discharge bulbs, observe the following:
Notes on dangerous high voltage/currents
→& ...
Mechanically positioned ball coupling
Fig. 107 Swivelling out the ball coupling
First read and observe the introductory information
and safety warnings In the rear bumper there is a ball coupling for the towing
bracket which can be swivelled out when needed. The ball coupling cannot be removed.
Swivelling out the ball coupli ...
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Pressure and boiling point
Refrigerant R134a