Reviewing the MASTERCOOL TEPM PRESSURE CHART iin FAQ forum .....
VAPOR pressure - could someone explain and use situtiations where it is relevent?
ie R134a at 80* vapor pressure is 86.6 - helps me how?
Easy question, but harder to answer. There are physical (or scientific) laws that affect refrigeration systems. These are called combined or ideal gas laws. There is a relationship in a gas between gas density, pressure, temperature and volume. What the chart tries to do is simplify these equations.
So the chart specifies at a certain temperature, a certain gas should have a specified pressure. In the other direction, a certain refrigerant at a specified pressure, will have a predictable temperature. So if you are measuring the low side of a car AC system, you can tell what temperature the evaporator should be.
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Edited: Thu April 08, 2010 at 2:15 PM by k5guy
So its 80* the engine is off low pressure is 86.6psi ............
An under charge would show? psi
An overcharge would show ? psi
Something in the simple fact is confusing me... or is it pretty much useless info
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