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Thread: Massive Humidity, where is it coming from

  1. #41
    Join Date
    Nov 2004
    Location
    SW FL
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    Quote Originally Posted by firehouse2701 View Post
    There are Natural Gas fired heat pipes in the bay not connected to the HVAC system.

    This building was built under the previous administration
    so finding the plans is tough but I will look.

    Hopefully they put it somewhere safe.
    So, the Bay is actually Climate Controlled by HEAT PIPES.

    ... SOMEWHERE SAFE ... GENERALLY means that the object that has been MISPLACED
    ________ will be found in 4 to 5 months. __ L.O.L.
    Designer Dan __ It's Not Rocket Science, But It is SCIENCE with Some Art. _ _ KEEP IT SIMPLE & SINCERE ___ __ www.mysimplifiedhvac.com ___ __ Define the Building Envelope & Perform a Detailed Load Calc: It's ALL About Windows & Make-up Air Requirements. Know Your Equipment Capabilities

  2. #42
    Join Date
    Nov 2004
    Location
    SW FL
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    Quote Originally Posted by teddy bear View Post
    1,000 cfm of fresh air change is a
    40 lbs. of moisture removal per hour many days
    of the three mild seasons of the year.

    The ERVs only transfer 40-50% of the moisture when you are exhausting <50% RH air and introducing +75%RH air.

    Evenings and rainy days, you have high indoor % after 3-4 air changes.

    Cut the ventilation rate to 200 -- 300 cfm and
    get the a/c tuned up to supply < 50^F dew point air while cooling.

    This will handle the really hot days.

    For evenings and rainy days,
    add 10 lbs.per hour of supplemental dehumidification
    to maintain 50%RH while the outdoor dew points are +50^F dew points.

    Three 5 ton a/cs will remove 45 lbs. of moisture per hour running 100% of the time.

    Adding a Santa Fe Ultra 155H
    to each a/c will get you 18 lbs. per hour and
    add 190,000 btus of reheat
    to extend the a/c run time
    when the indoor %RH is above 50% RH.

    This very effective way of maintaining < 50%RH in the occupied space.

    Done it many times.
    The problem will go away till next spring because of the collapse of the outdoor dew point last week.
    But when the problem returns next spring, lets HVAC Talk again. We know how to fix this.

    Keep us posted.

    Regards Teddy Bear

    190,000 BTUS of Heat from the 155H seems Very Large.
    However, no period is stated. __ Is that 24 hours or 24 days?

    or is that 19,000
    Designer Dan __ It's Not Rocket Science, But It is SCIENCE with Some Art. _ _ KEEP IT SIMPLE & SINCERE ___ __ www.mysimplifiedhvac.com ___ __ Define the Building Envelope & Perform a Detailed Load Calc: It's ALL About Windows & Make-up Air Requirements. Know Your Equipment Capabilities

  3. #43
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
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    Quote Originally Posted by dan sw fl View Post
    190,000 BTUS of Heat from the 155H seems Very Large.
    However, no period is stated. __ Is that 24 hours or 24 days?

    or is that 19,000
    Thank you for catching that. 19,000 btus/hour of reheat is the number.

    Regards Teddy Bear
    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"

  4. #44
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
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    Quote Originally Posted by firehouse2701 View Post
    Bathroom fans run when lights turned on, currently broken and we are getting repaired

    ERV was disconnected by HVAC techs thinking the humidity was coming from outside the building

    Crews are now telling me they see water on the floor coming from underneath the tiles. I thought this may be a shower leak since its on the other side of the wall but this area they are finding water is in the middle of the hall. Could there be a water break under the concrete floor coming up?
    Also consider the moisture could be condensation if the air dew point is above the floor temperature. Floors could easily <60^F.

    Regards Teddy Bear
    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. #45
    Join Date
    Sep 2002
    Posts
    31,168
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    So anyway: how much water is the sole operating system producing per hour as condensate output?
    PHM
    --------
    The conventional view serves to protect us from the painful job of Thinking

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