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press temp chart?

kev2 on Thu April 08, 2010 1:18 PM User is offline

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?

k5guy on Thu April 08, 2010 2:14 PM User is offline

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

kev2 on Thu April 08, 2010 2:58 PM User is offline

MORE INPUT

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

HECAT on Thu April 08, 2010 8:00 PM User is offline

Quote
Originally posted by: kev2

An under charge would show? psi

An overcharge would show ? psi

Pressures are used to evaluate performance.

Charging is done by weight.

Static pressure at a given temperature indicates the existence of a charge.

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