Aerospace and train applications

The most common form of air cycle is the reverse-Joule (or Brayton) cycle. This is the basis of most aircraft air conditioning systems on account of its safety, reliability and light weight.
Air cycle cooling units have been chosen for carriage air conditioning in Germany's new ICE-2 high speed trains, on account of their lower overall life cycle operating costs.
AlliedSignal Normalair-Garrett Ltd (NGL) are the UK's leading manufacturer of air cycle cooling units for the demanding requirements of military and civilian aircraft cabin air conditioning.  NGL have recently developed this technology for air conditioning railway carriages.  A successful in-service trial of a prototype unit during 1995 in a German ICE-1 high speed train led to the units being chosen for the new generation ICE-2 trains.  The air cycle units have lower predicted life cycle costs than conventional vapour compression systems using HFC-134a as refrigerant. 
 
 
 
Click on icon to download a high quality photograph of the train air cycle pack. 
 
 (Courtesy Allied Signal Normalair Garrett) 
 
 
Click on icon to download a high quality photograph of the turbo machinery in the train air cycle pack. 
 
 (Courtesy Allied Signal Normalair Garrett) 
 
Click on icon to download an annotated drawing of the train air cycle pack. 
 
 (Courtesy Allied Signal Normalair Garrett) 
 
 
 
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