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:

Introduction
This chapter contains information on the following subjects:  → Technical requirements  → Fitting the removable ball coupling  → Removing the ball coupling  → Hitching and connecting the trailer  → Loading the trailer  → Towing a trailer   ...

Wheel, Balancing on Stationary Balancing Machine
Before beginning balancing, the following requirements must be fulfilled. The tire pressure must be OK. The tire profile must not be worn on one side. The tire profile must be at least 4 mm. ...

Valve, Removing and Installing, Valve Explanations
1. Valve Body 1 -  Valve body 2 -  Valve Insert 3 -  Valve cap The rubber valve for tubeless tires is designed to seal air-tight in the ...

© 2016-2022 Copyright www.vwpolo.net