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:
Overview of fitting locations - front control motors, air conditioning system
with electric/manual controls, RHD vehicles
1 -
Temperature flap control motor -V68-
Checking: with vehicle diagnostic tester
Removing and installing
→ Chapter.
Renewing: initiate basic setting using vehicle diagnostic tester.
2 -&nb ...
Introduction
This chapter contains information on the following subjects:
→ Warning lamp and coolant temperature display
→ Coolant specification
→ Checking the coolant level and refilling coolant
Never carry out any work on the engine coolant system if you are not famili ...
General notes
Cleanliness specifications for working on
the auxiliary heater and fuel system
When working on the fuel supply and injection system, pay
careful attention to the following “rules”:
Thoroughly clean all unions a ...
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Pressure and boiling point
Refrigerant R134a