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Thread: True or False?

  1. #27
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    You never stated in the original question the leaving air was below dew point. The evap leaving air in Wisconsin may be below dew point, but in Albuquerque, I don’t think so .
    Ed J

  2. #28
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    AirDoctor,
    Your thought process and references are valid but....Dewpoint references the surface temperature at which the air condenses out some moisture, not specifically the temperature of the air.

    "If perfection is your goal, you may end up with good enough, what might you end up with when good enough is your goal?"
    Wayne Pendergast, efficientcomfort.net

  3. #29
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    That's true I didn't... but I did clarify the question after a few responses:

    Quote Originally Posted by air-doctor View Post
    (At Least) one wiseguy in every crowd... let's assume its summertime and its 75 degrees and 55% relative humidity in the house and the A/C is running with an evaporator temperature of 45 degrees.

    True or False... Air leaving the evaporator coil is at 100% relative humidity

  4. #30
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    A 45°F evap does not always = a supply temp below dew point .
    Ed J

  5. #31
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    Watch out now.........that calculator from earlier is from a member posting in here


    We don't mind being educated.....or at least I know I don't.

  6. #32
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    Quote Originally Posted by BigJon3475 View Post
    We don't mind being educated.....or at least I know I don't.
    I'm still learning too!

    "If perfection is your goal, you may end up with good enough, what might you end up with when good enough is your goal?"
    Wayne Pendergast, efficientcomfort.net

  7. #33
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    That's also true Ed... but I didn't say Supply Temperature... I said air leaving the evaporator... as soon as the air travels into the duct system it mixes with the slightly warmer air in the ductwork and then the air is no longer below the dewpoint.

  8. #34
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    Then give us a CFM, you know what you mean when you write a question, but we can only answer based on the info given.



    That is your 45° coil, RH well below 100% RH .

    Chicks dig a guy who can plot a psych chart .
    Last edited by Ed Janowiak; 06-09-2008 at 10:18 PM. Reason: changed above to below
    Ed J

  9. #35
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    Quote Originally Posted by air-doctor View Post
    That's also true Ed... but I didn't say Supply Temperature... I said air leaving the evaporator... as soon as the air travels into the duct system it mixes with the slightly warmer air in the ductwork and then the air is no longer below the dewpoint.

    The bypass air??

  10. #36
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    Okay 38 post why haven't you applied for pro?

  11. #37
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    I'm sure you were just throwing numbers out there for the fun of it...

    But, I'd say it's rare to find a 30 degree temp drop across a coil when there's that much moisture in the air

    Can ya tell we like to nitpick on this forum? lol
    "If you call that hard work, a koala’s life would look heroic."

  12. #38
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    The air that is coming out of the evaporator has not yet had a chance to mix with the air that has leaked around the coil...

    but ok nevermind... shoulda known you experts wouldn't appreciate a trick question. But I'd be willing to bet that at least one of you will use it on another unsuspecting technician.

  13. #39
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    Nice.

    He is one for you.

    If you have a frig with enough capacity to cool the house and you leave the door open, will it cool the house?
    Ed J

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