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  1. #1
    Join Date
    Apr 2003
    Location
    GA/SC
    Posts
    360
    Load Calculation Question.........

    Observed a load calculation with software and it recommends a 1-ton system for a heat gain up to 15,000 btu's.

    Recommends 1 1/2- ton system for heat gain up 21,000.

    Why a 12,000 btu system for 15,000 Btu heat load?
    Why a 18,000 btu system for 21,000 Btu heat load?
    etc. etc.

    Thanks for any feedback?


  2. #2
    Join Date
    Dec 2002
    Location
    peoples republic of maryland
    Posts
    954
    Because you've done a load calc on a "peak degree day". Whatever that value is for your area (say 95*f), you'll actually see many more "normal" non-peak days (possibly 80*-85*),where that maximum value (load rating)is not needed, during those times a slightly smaller unit will cycle regularly and still have enough run time to effectively reduce indoor humidity. During those few "peak" days the unit will run longer, but the longer run times during hot whether are better for the equipment than short cycling terribly during "normal" ambient temperature ranges causing higher than normal indoor humidity. That's why it is better to slightly undersize than to oversize a unit.
    "The meek shall inherit the earth"
    "he that's walking with wise persons will become wise, but he that is having dealings with the stupid ones will fare badly" Proverbs 13:20
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  3. #3
    Join Date
    Apr 2003
    Location
    GA/SC
    Posts
    360
    Thanks MD...........
    Completely understood...

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