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  1. #1
    Join Date
    Jul 2011
    Location
    NEW YORK
    Posts
    58

    Maintaining Space Temp & Prevent Humidity? Pro/Cons

    New Unit for OR. To prevent the humidity from exceeding 60%RH is the mixing of 44F pretreated min outsideair (95F db and 75 wb) with the space return temp.
    The air-cooled condensing unit with the hot gas control shall maintain a discharge minimum outside air temp of 44F.
    When the outside air temp is below 50F, the air-cooled condensing unit shall be locked out and steam control valve serving the min outside air heating coil shall maintain a discharge temp of 50F.
    The main unit chw coil shall maintain a discharge air of 50F.
    Below 50F, the max outside air dmp, ret air dmp and spill/exh dmp shall sequence to maintain a discharge air temp of 50F.
    The Discharge temp of 50F shall be reset up to the lowest discharge air temp sensor of a zone space heating coil.
    When the outside air temp is below 30F, the chilled water control valve shall go to the wide open position and the chill water pumps shall be activated.

    This seems alittle complicated, any suggestions? Pro's or Cons.

    Thank you so much for your feedback, really rely on your help!!!

  2. #2
    Join Date
    May 2012
    Location
    San Diego, CA
    Posts
    352
    This is for an hospital operating room? The only part I don't understand is why the chilled water should be running at 30 F below... should the 50 below setting of heating or cooling the air to 50 F work under 30 F? Is there a min humidity you need like can't get under 40%?
    You can call me Sam

    It should be a crime to be a mechanical engineer in San Diego
    Summer Design Temperature: 83 F Dry Bulb ~ 69 F Wet Bulb (California Climate Zone 7)

  3. #3
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    5,997
    Quote Originally Posted by CHAMBERS87 View Post
    New Unit for OR. To prevent the humidity from exceeding 60%RH is the mixing of 44F pretreated min outsideair (95F db and 75 wb) with the space return temp.
    Discharge temp of 50F shall be reset up to the lowest discharge air temp sensor of a zone space heating coil.
    When the outside air temp is below 30F, the chilled water control valve shall go to the wide open position and the chill water pumps shall be activated.

    This seems alittle complicated, any suggestions? Pro's or Cons.

    Thank you so much for your feedback, ...
    Call your HVAC Doctor !

    Operating Room is as Complexicated as it gets.
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

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