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
improve the car's handling. The design of summer tyres (width, rubber compound,
tread pattern) gives less grip on ice and snow. Volkswagen urgently recommends the
...
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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Refrigerant R134a Physical Data
Refrigerant R134a Environmental Information