Advantages of Three Wheel Boot Strap System Airconditioning

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Rahul Mohan P
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Hi
I want to the advantages of three wheel Bootstrap air-conditioning System over two Wheel system in an air cycle machine used in aircraft environmental control system. Can anyone please help.
 

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Just an guess, maybe educated or not.

But the three wheel provides a more controlled amount of air through the heat exchanger from the fan being connected to the shaft.
It would work "better" on the ground for the comfort of the passengers I think, when there is no forced air from the movement of the airplane.
Thermodynamically there doesn't seem to be all that much of a difference if any.
 
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256bits said:
Just an guess, maybe educated or not.

But the three wheel provides a more controlled amount of air through the heat exchanger from the fan being connected to the shaft.
It would work "better" on the ground for the comfort of the passengers I think, when there is no forced air from the movement of the airplane.
Thermodynamically there doesn't seem to be all that much of a difference if any.
Yes may be you are right.Thanks Dude.
 
Rahul Mohan P said:
Yes may be you are right.Thanks Dude.
As an after thought, rather than from just a design perspective, there is also the operations perspective.

The number of system components to check for proper operation, and if a fault detected then mantainance turnaround.
With the three wheel, if the airconditioning doesn't function, the fault can be pinpointed more directly to the AC unit - replace the unit.
In the two wheel, is it the fan for forced flow and/or its electrical circuit, or the AC unit. Mechanics have a few more things to check.