Phase-Out
Refrigeration and A/C System Fundamentals
Refrigeration System Components and Operation
Equations
Refrigerant Chemical and Applications
100
CHLORINE BASED REFRIGERANTS
What contributes to the depletion of the earth's stratospheric ozone?
100
Can be divided into two pressures.
What is condensing and evaporating?
100
____is not a substance or an energy form it is a lack of heat
What is Cold
100
7 to 1.
what is compression ratio?
100
CFCs, HCFCs and HFCs.
chlorofluorocarbons, hydrochlorofluorocarbons and hydrofluorocarbons?
200
What refrigerant was widely used in the 1930's?
What is CFC-12 (R-12) refrigerant?
200
Evaporating Pressure
What is Low side pressure, Suction pressure, and Back pressure?
200
Liquid ______large amounts of heat when they boil off to a gas
what is Absorb
200
A technician can tell how efficiently a system is operating.
what is Compression ratio?
200
What is the relationship between electrical conductivity and thermal conductivity
what is material that make a good electrical cnductor also tend to make a good thermal conductor
300
Was widely used in refrigeration and air conditioning application since the 1940's.
What is R-22 refrigerant?
300
Refrigerant changes state
What is condensation?
300
A _______compressor uses pistons in a cylinder.Gas is compresse by squeezing it between the piston and a valve plate at the top of the cylinder
what is reciprocating
300
Gauge pressure + Atmospheric pressure
what is Absolute pressure?
300
Dichlorodifluoromethane
what is Freon-12?
400
Based on the 1974 Molina-Rowland theory.
What is chlorine and bromine?
400
These pressures are separated in the system
what is the compressor discharge valve and metering device?
400
which type of metering device provides the most efficient operation?
what is thermostatic expansion valve
400
How much mechanical force is required to lift a 250 pounds compressor two feet?
what is 500 footpounds of force
400
The refrigerant R-134a in a sytem component has a pressure of 35 psig and a temp.of 40 degree f it is_______
what is saturated
500
HCFC-22 PRODUCTION
What is 2020 PHASE-OUT?
500
High side pressure, Head pressure, Discharge pressure
What is Condensing Pressure?
500
The _____line and the ______line connect the inside and outside units of a split system.
what is suction and liquid
500
Compression Ratio
what is Absolute discharge pressure divided by Absolute suction pressure?
500
the amount of heat in BTUs required to change 5 pounds of 10 degree f to 242 degree f steam
what is 7,550 BTUs
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