Basic Laws
If volume decreases or if gasses are compressed into a smaller space
Heat and/or temperature will increase
Refrigerant Entering The Metering Device is
High Pressure Liquid
When a refrigerant temperature is above its saturation point it is...
A superheated vapor
Why don't we want liquid in the suction line?
When does condensation form?
When the temperature of a surface drops below the dew point temperature of the air
Higher pressure goes to____ and Higher temperature goes to _____
Lower pressure ; lower temperature
State and characteristics of refrigerant entering the condenser
High pressure, high temperature, superheated vapor
The temperature below the condensing temperature is referred to by
subcooling
How do you know when vacuum pump oil has been contaminated by water
It is white & Foamy
As the temperature increases how is relative humidity affected.
It goes down
Decreasing the pressure will lower the _____ of a substance
boiling point
Refrigerant Entering the Evaporator coil is
Flash Gas (mostly Liquid)
heat change you can measure with a thermometer
Sensible heat
What gas is commonly used for leak testing
Nitrogen
Generally accepted airflow rage for air conditioning is
350-450 CFM per ton
One ton of refrigeration
12,000 BTUS
The refrigerant entering the compressor
Low pressure, low temperature, superheated vapor
Heat released or absorbed during a change of state is referred to as
Latent heat
Thermal Expansion Valve
What is sign it is low airflow rather than a refrigerant issue
High temperature split
1 BTU will....
Change 1 pound of water 1 degree
What is the main component that a heat pump will have in a refrigeration system that an Straight AC will now
Reversing Valve
What are 5 other terms for saturation temperature that might be used
Condensing temperature, boiling temperature, coil temperature, Dew/bubble point,
If it is 100 Degrees outside, About what should the condensing temperature be an older, lower effeciency (<10 Seer) AC be?
130 Degrees
What is the target wet bulb difference between return and supply air on an Air conditioner
10 degrees