Volkswagen Polo Service & Repair Manual: Critical Point
| Vehicle air conditioning systems make use of the
vaporization and condensation process. In this case, one works
with a substance which boils easily, designated as refrigerant. |
| The refrigerant employed is tetrafluoroethane R134a, which
boils at -26.5 °C (-15.7 °F) at a vapor pressure of 1 bar (14.5
psi). |
| The critical point (critical temperature and critical
pressure) is that above which there is no longer a boundary
between liquid and gas. |
| A substance above its critical point is always in the
gaseous state. |
| At temperatures below the critical point, all types of
refrigerant in pressure vessels exhibit both a liquid and a gas
phase, i.e. there is a layer of gas above the liquid. |
| As long as there is still gas present in the container next
to the fluid, pressure is dependent on ambient temperature.
Refer to
→ Chapter „Refrigerant R134a Vapor Pressure Table“. |
Note
| Different types of refrigerant are never to be mixed. Only
the refrigerant designated for the corresponding A/C system may
be used. |
|
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Vehicle air conditioning systems make use of the
vaporization and condensation process. In this case, one works
with a substance which boils easily, designated as ref ...
Vehicle air conditioning systems make use of the
vaporization and condensation process. In this case, one works
with a substance which boils easily, designated as ref ...
Other materials:
Winter tyres
First read and observe the introductory information
and safety warningsIn winter road conditions, winter tyres will considerably
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...
Overview of the driver door
Fig. 4 Overview of the controls in the
driver door (left-hand drive vehicles) The controls are mirrored in right-hand
drive vehicles
Key for :
Door release lever
Central locking button for locking and
unlocking the vehicle
Switch for adjusting the exterior mirrors:
...
Two-Part HS Performance Clear Coat
Definition:
Two-Part HS Performance Clear Coat -LZK 769 K06 A5-
Edition 08/2012
Product Description
The two-part HS performance clear coat is a high-gloss, VOC
compliant high ...
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