VW Polo manuals

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).
   
Vapor pressure curve of water
A -  fluid
B -  Gaseous
C -  Vapor pressure curve of water
1 -  Pressure acting on liquid in bar (psi)
2 -  Temperature in °C (°F)
 

Pressure and Boiling Point

Vapor pressure curve of refrigerant R134a
A -  Fluid
B -  Gaseous
D -  Vapor pressure curve of refrigerant R134a
1 -  Pressure acting on liquid in bar (psi)
2 -  Temperature in °C (°F)
 

Pressure and Boiling Point

Physical Principles
The four known states of water also apply to air conditioning system refrigerants. 1 -  gaseous (invisible) 2&n ...

Refrigerant R134a Vapor Pressure Table
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:

Tire Pressure Monitoring Sensor without Valve, Removing and Installing, Vehicle Before Customer Delivery
Special tools and workshop equipment required Torque Wrench -VAG1410- Perform the Following: Removing –  Remove the tire from the disc wheel. &nb ...

Warning and indicator lamps
The warning and indicator lamps indicate various warnings , faults or certain functions. Some warning and indicator lamps light up when the ignition is switched on and should go out once the engine is running or the vehicle is in motion. Depending on the vehicle's equipment level, additional ...

Tread Depth, Measuring
  Note When measuring tread depth, take measurements in the main grooves. Do not take measurements at the tread wear indicator.     Tread depth of a tire must be mea ...

© 2016-2019 Copyright www.vwpolo.net