M12.06 Air Con Flashcards
(17 cards)
Sources of air-con ?
Engine/APU
Ground AirCon unit
4 types of heater/air conditioning ?
Electrical heating
Combustion heating
Air cycle machine
Vapour cycle machine
What is the major downside to combustion heaters ?
If not maintained properly it will leak carbon monoxide into the cabin
Most common air used for cooling?
Ram air
Does an air cycle machine use refrigerant ?
No not uses air
Main components of an air cycle machine ?
A centrifugal compressor and one/two expansion turbines
What do the heat exchangers use as a cooling medium?
Ambient air
How is water removed from an air cycle machine?
Water separator
Air cycle machines can also be known as ?
Bootstrap system
How is the compressor driven in a vapour cycle machine?
Motor or the engines
Main components of a vapour cycle machine ?
Compressor
Condenser
Receiver dryer
Thermal expansion valve
Evaporator
What are hot air pipes usually made from?
Heat resistant materials and wrapped in insulation
What does a jet pump do ?
Mixes engine bleed air with ambient
What is used to detect over temps in the air conditioning system ?
Thermal switch
Where are high pressure switches placed on a vapour cycle machine?
At the compressor outlet
What does a temp sensitive burst fuse do and where is it on a vapour cycle machine?
Vents refrigerant if it’s too hot and vents it to atmosphere and is located on the compressor outlet
What is on an air cycle machine to ensure the air isn’t to cold and how does it do this ?
A low limit valve it does this by passing warm bleed air around the machine and mixing with the output
