Part 2 Flashcards
Revolvers tank should not be filled beyond
80%
High pressure terms
High Side,” “Head Pressure” and “Discharge
Pressure”
Low pressure terms
Suction Temperature,” “Evaporator Temperature”
and “Saturated Suction Temperature”
Low side gauge reads
Reads suction pressure
• Reads suction temperature
• Reads vacuum
High side gauge
Reads condensing pressure
• Reads condensing temperatur
Saturated” refrigerant:
A mixture of liquid and vapor at the same time
– It has a pressure / temperature relationship
If you know the suction pressure
You can find the refrigerant’s evaporating temperatur
If you know the head pressure,
You can find the refrigerant’s condensing temperatur
Temp
Intensity of heat in degrees
Quantity
Amount of heat in BTU
Sensible Heat
Change in temp
Latent Heat
Change in state
Water raises…
Raises I lb per 1F
Ice raises
1 lb per 2F, specific heat of 0.5
144 Btu will change 1 lb of 32°ice
To 32* water
Heat of fusion
Is required to change ice to water
Sensible heat is measured with
Thermometer
1 Btu raises 1 lb water 1°F
Getting vapor back to a liquid
Latent heat must be removed from the vapor
The outdoor air cools hot refrigerant Vapor
The heat is absorbed by the cooler air
If vapor is cooled to it’s condensing temperature
Vapor condenses to a liquid
Below it’s boiling point?
Subcooled-liquid only
Boiling point
Saturated, part liquid part vapor
Above boiling point
Superheat - Vapor only
