In typical vapour cycle system, the sub-cooler
- cools the vapour further to prevent slugging.
- is a heat exchanger to superheat the vapour.
- delivers extra cooling effect when the aircraft is on ground.
Explanation from PART66Online
The sub-cooler is a heat exchanger with two passages: warm high-pressure liquid refrigerant on its way from the receiver to the expansion valve, and cold low-pressure vapour on its way from the evaporator to the compressor. Heat flows from the liquid to the vapour. The liquid is sub-cooled, which prevents flash-off ahead of the expansion valve, and the vapour is warmed above its saturation temperature (superheated), so any remaining droplets boil off and only dry gas reaches the compressor. The vapour is therefore heated in the sub-cooler, not cooled, and the unit provides no extra cooling reserved for ground running.
soonhchong asked · 18 May 2012
option 1 is the most correct answer?!
navyaviation.tpub.com/14020/css/14020...
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