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  1. #1
    Join Date
    Jun 2011
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    a/c in a make up air plenum?

    I was just thinking, if you had an area that a make up air unit was servicing that was way to hot, is there any reason that putting an air conditioner in the plenum of the make up air is a bad idea?
    I would suspect you would get your 20 degree drop in temperature across the coil, which would help keep the area cooler

  2. #2
    Join Date
    May 2011
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    6
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    i have seen make-up air units with cooling coils built into the ductwork. however the area the make-up air is serving should already have a way of conditioning the air. My point is you may have a problem elsewere if the design of the space included fresh air in the calculations.

  3. #3
    Join Date
    Apr 2010
    Location
    Minnesota
    Posts
    527
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    I've seen MAU's with DX cooling. Needs to be properly designed to work right.

  4. #4
    Join Date
    Aug 2010
    Location
    honolulu, hawaii
    Posts
    124
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    If its food service be careful, gotta get everthing sized correctly, its a design issue.

  5. #5
    Join Date
    Mar 2010
    Location
    Hot Desert SW
    Posts
    27
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    Chilled water or condenser water available? I've seen both used. Chilled water obviously for cooling only, and condenser water from a WSHP building to temper OA for make up/ fresh air

  6. #6
    Join Date
    May 2011
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    if you can give me a maufacturer name on the mau, i might be able to tell you more. there are systems called heat recovery ventilators that have a heat wheel, which pulls x amount of air out of the space and the same amount of outside air and transfers the temp of the building air to the fresh air. You may have a loose belt,clogged filters, or a clogged heat wheel. in any event there is usually fresh air into the space and way to pull the same amount out of the space.

  7. #7
    Join Date
    Apr 2010
    Location
    southern california
    Posts
    535
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    Depending on the psychrometrics , a direct or indirect evaporative cooler will be more cost effective to operate. We do alot of work with Reznor. You can use their Preeva with a evaporative cooling module or if you really want to get fancy check out their MAPs units. The Maps have dx or chilled water coils.

  8. #8
    Join Date
    Jun 2005
    Posts
    171
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    That is what we have at correctional facilities. 100% outside air is being conditioned. It has to be size properly to work.
    If we evolve from the monkey then why are there still monkeys.

    GOD Bless America.

  9. #9
    Join Date
    Feb 2006
    Location
    SouthEastern Virginia
    Posts
    1,077
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    I'm with sometech, install a heatwheel.
    It might get loud!

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