Mxsmanic wrote:
> Mike Hunt writes:
>
>
>>Due to the pressure, the air is actually too warm for the cabin, so it
>>needs to be COOLED prior to entering the cabin, not heated. If the cabin
>>is too cool, it is NOT due to not heating the cabin enough, but cooling
>>it too much.
>
>
> It depends on the aircraft and on the specific settings used by the
> crew. Air for heating comes from the engines and is very hot. Frigid
> outside air can be mixed with this to moderate temperature. And
> compressed air from the engines (hot air) can be cooled and then
> expanded to produce cold air for refrigeration. In general, the cabin
> must be heated at altitude, and cooled on the ground.
>
Are you sure about this? That isn't how Boeing describes it. |