| abstract |
An ECS system (10) includes a RAM air fan (RAF) system (76, 78) downstream of a respective heat exchanger in the relatively high temperature RAM exhaust The RAF (76, 78) includes a RAF electric motor (80) such that the RAF (76, 78) is driven at a speed independent of an ACM (26) which reduces generated noise and increases overall operating efficiency. A fan rotor (102) is completely supported by hydrodynamic foil journal and thrust bearings (88, 90, 92) which permits effective operation of the RAF (76, 78) downstream of the respective heat exchangers in the relatively high temperature RAM exhaust As the RAF (76, 78) is driven by the RAF electric motor (80) the RAF (76, 78) is installed in the ECS system as a self contained system such as Line Replaceable Units (LRUs). |