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Thread: True or False?

  1. #66
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,232
    This may be a waste of time but.. The cooling coil is always colder than the air the coil is cooling. As the air flows flow through the coil, a temperature gradient occurs. The air molecules closer to the coil tubes are colder but never the coil temperature. The air further away is warmer. The best of coils have mixed approach temperature of 2-4^F. Smaller coils with high air flow have higher approach temperatures. Measuring extreme high/low humidity with normal equipment is inaccurate. 95%RH is about as high you can get with extreme a/c coils. Real dew point equipment using a chilled mirrow/calibrated thermometers are the type of equipment needed. Most electronic meters are inaccurate above 80% or under 30%. There are alot of opinions out there but testing things like this are difficult even in a high tech lab. 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"

  2. #67
    Join Date
    Jun 2001
    Location
    Louisville, KY
    Posts
    12,119
    Not a waste of time, TB. I speak geek.
    Perhaps you should have read the instructions before calling.

  3. #68
    Join Date
    Mar 2007
    Location
    Myrtle Beach, SC
    Posts
    2,919
    Hey TB, Tell him how much those lab grade instruments cost. It will make his eyebrows pucker up. We tend to believe our $200.00 meters are 100 % accurate. And we don't even get them calibrated every year like you lab guys do.
    Remember, Air Conditioning begins with AIR.

  4. #69
    Join Date
    Dec 2002
    Location
    Toledo, Ohio, United States
    Posts
    12,899
    Twilli says maybe
    No Heat No Cool You need Action Fast

  5. #70
    Join Date
    Mar 2008
    Posts
    16
    Air can be cooled to below the dewpoint but then the dewpoint is lower so air can't really be below the dewpoint, I think.

  6. #71
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,225

    Frown Fault

    Quote Originally Posted by air-doctor View Post
    True or False... Air leaving the evaporator coil is at 100% humidity
    F
    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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