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Thread: Superheat

  1. #1
    Join Date
    Dec 2004
    Posts
    440
    Target Superheat=(return wb x 3 - condensor intake drybulb -80) /2

    So let's say return wetbulb at evap. intake is 80
    and it is 80 degrees at the condensor intake


    80 x 3 = 240 - 80 - 80 = 80 divided by two = 40

    Under these circumstances you should
    have 40 degrees superheat?

  2. #2
    Join Date
    Apr 2002
    Location
    Dallas, TX
    Posts
    2,987
    Yes, but keep in mind that the equation you have is a simple linear correlation of some charging chart data. You don't know how accurate the correlation is at the conditions you state. And 40°F superheat will be about the TD of the evaporator so charging to this superheat may prove difficult.

  3. #3
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,776
    That would be right, + or - 5°

    Although at that ID WB, and OD DB, I wouldn't expect the ID delta to be much more then 10° untill the WB dropped to the mid to low 70's.
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  4. #4
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    33,931
    In a rainforest that sounds close!

    Try a more normal scenario. How about 65wb and 85 out?

  5. #5
    Join Date
    Dec 2004
    Posts
    440
    Originally posted by BaldLoonie
    In a rainforest that sounds close!
    In Florida we often have high humidity. But
    how can you tell what the humidity is since
    I never gave the indoor dry bulb tempt.?

  6. #6
    Join Date
    Dec 2004
    Posts
    440
    Originally posted by BaldLoonie
    In a rainforest that sounds close!

    Try a more normal scenario. How about 65wb and 85 out?
    I never said you could not find some conditions
    where this equation works. I just wanted to
    know if it was always accurate. It is quite
    possible to have 80 degree indoor wet bulb
    and 85 degree or 90 degree indoor dry bulb.

  7. #7
    Join Date
    Dec 2004
    Posts
    440
    Where am I wrong?

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