Oversized and extreme high humidity - Page 2
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  1. #14
    Join Date
    Sep 2011
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    85
    How does a colder coil slow the cooling process?

  2. #15
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,255
    Quote Originally Posted by wdshea View Post
    How does a colder coil slow the cooling process?
    Colder coils reduce the btus per of cooling. Compressors pump less refrigerant at lower suction pressures.


    Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  3. #16
    Join Date
    Jul 2012
    Location
    Southwest
    Posts
    114
    I have witnessed humidity problems on fitness centers, lacking fresh air. You may be able to run one compressor fine without oil return problems.
    Contact the manufacturer to verify. Also, have the manufacturer engineer a way to downsize the tonnage..
    I would be concerned long term for that unit if it is that oversized.

  4. #17
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,255
    Quote Originally Posted by B1978 View Post
    I have witnessed humidity problems on fitness centers, lacking fresh air. You may be able to run one compressor fine without oil return problems.
    Contact the manufacturer to verify. Also, have the manufacturer engineer a way to downsize the tonnage..
    I would be concerned long term for that unit if it is that oversized.
    There are many days where there is low/no cooling loads yet the outdoor dew points are above the acceptable indoor dew points. Plus the moistue the occupants add to the total moisture that must be removed. Over-cooling lowers the indoor temp which in turn increases the amount of moisture that must be removed to maintain low %RH. Supplemental dehumidification by high efficiency dehumidifier like the Ultra-Aire/Santa Fe/Hi-E Dry/Quest are a long term solution to provide ideal temp/%RH.
    Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  5. #18
    Join Date
    Jul 2012
    Location
    Southwest
    Posts
    114
    Could he add a ton of outside air to increase his load? Guess it depends on his region, whether he's in a humid area or not.

  6. #19
    Join Date
    Mar 2008
    Location
    NC
    Posts
    1,460
    If this is a new jail, are you at capacity yet? I would assume the engineers sized the unit based on maximum occupant capacity.

  7. #20
    Join Date
    Jul 2012
    Posts
    32
    The space needs to have positive pressure, but not too much. Make sure you have some make up air (approx 10%).

    You need to run on 1 stage, cycling 2nd stage as needed. If you can control 2 stages of blower speed to go with your 2 stages of compressors, that would be ideal.

  8. #21
    Chris_Worthington's Avatar
    Chris_Worthington is offline Controls Committee & Global Moderator
    Join Date
    Jul 2007
    Location
    Mount Airy, MD
    Posts
    7,281
    Quote Originally Posted by Blows_Sucks_Heats_Cools View Post
    The space needs to have positive pressure, but not too much. Make sure you have some make up air (approx 10%).

    You need to run on 1 stage, cycling 2nd stage as needed. If you can control 2 stages of blower speed to go with your 2 stages of compressors, that would be ideal.
    Codes for Jails/Prisons are not going to allow you to cut back on outside air, they want 100% ODA and the air changes to boot.

  9. #22
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,255
    Quote Originally Posted by Blows_Sucks_Heats_Cools View Post
    The space needs to have positive pressure, but not too much. Make sure you have some make up air (approx 10%).

    You need to run on 1 stage, cycling 2nd stage as needed. If you can control 2 stages of blower speed to go with your 2 stages of compressors, that would be ideal.
    Hekp us understand how we are going to control %RH during 60-70^F dew point outside air during low/no cooling condition? Like we need latent cooling with much sensible cooling.
    Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

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