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  1. #1
    Join Date
    Jul 2008
    Location
    Denver, CO
    Posts
    4,229

    HVAC on commercial aircraft

    It's an entirely new ball game.
    http://www.youtube.com/watch?v=ZmBWiye-Sm4
    Do NOT click HERE

  2. #2
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,915
    Basically compress the crap out of the air, cool the hot compressed air down with outdoor air, separate the condensation from it, then feed it out through the air distribution system, where it magically becomes cold as it expands.
    No refrigerant cycle needed.

    Works great at 30k, where the outdoor air is very cold all the time.
    Not so great on the ground, but still acceptable.
    Sucks bawlz when your flight gets delayed, after boarding, and the pilot starts backing off the APU, and shutting stuff down to conserve fuel.
    If more government is the answer, then it's a really stupid question.

  3. #3
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    19,571
    The air cycle pack system is very common on transport category aircraft.

    Usually, it works great.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  4. #4
    Join Date
    Jul 2008
    Location
    Denver, CO
    Posts
    4,229
    Quote Originally Posted by mark beiser View Post
    Basically compress the crap out of the air, cool the hot compressed air down with outdoor air, separate the condensation from it, then feed it out through the air distribution system, where it magically becomes cold as it expands.
    No refrigerant cycle needed.

    Works great at 30k, where the outdoor air is very cold all the time.
    Not so great on the ground, but still acceptable.
    Sucks bawlz when your flight gets delayed, after boarding, and the pilot starts backing off the APU, and shutting stuff down to conserve fuel.
    The cooling effect comes from the discharge air at the expansion turbine.
    Do NOT click HERE

  5. #5
    Join Date
    Feb 2012
    Location
    GTA, ON
    Posts
    1,290
    I just gotta find the control panel on the 737-700... Those Copa Air crazies keep the cabin WAY too cold

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