Inspect And Operate Of A Vapor-cycle Cooling System Flashcards
What are two types of air conditioning systems that may be installed on an aircraft?
Air-cycle systems and vapor-cycle systems
How is the heat removed from an aircraft cabin with a vapor-cycle air conditioning system?
The cabin heat is absorbed by the refrigerant in the evaporator, then carried outside the aircraft where it is given up to the outside air in the condenser
What produces the cool air in a vapor-cycle air conditioning system?
Warm cabin air is blown across the evaporator, where its heat is transferred into the refrigerant. The air that leaves the evaporator is cool
What is used as the refrigerant in a vapor-cycle conditioning system?
A freon-type liquid refrigerant known as refrigerant 12, or the more environmentally friendly R-134a
What is the state of the refrigerant as it leaves the compressor?
It is a high-pressure gas
What is the state of the refrigerant as it leaves the condenser?
High pressure liquid
What is the state of the refrigerant as it leaves the thermostatic expandion?
Low pressure liquid
What is the state of the refrigerant as it leaves the evaporator?
It is a low pressure vapor
How is the compressor lubricated?
Refrigeration oil is mixed with the refrigerant into the evaporator that all of it will be evaporated by the time it leaves the evaporator coils
How should the components in the low side of a properly operating vapor-cycle cooling system feel?
They should feel cool
How is a vapor-cycle cooling system checked for refrigerant leaks?
Hold the probe of an electronic leak detector below any suspect fitting or component.
What safety equipment should be worn when charging a vapor-cycle cooling system?
A safety face shield that protects the entire face
