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Thread: Three Fuel ?

  1. #14
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    67,591
    Most of that dust will go through the dry coil.
    If it was wet, then more of it would stay on the coil.
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    How many times must one fix something before it is fixed?

  2. #15
    Join Date
    Jun 2007
    Location
    Bucks Co PA
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    364
    Ok, learning time for a homeowner. At what OD temp is a HP defrost necessary??
    .

  3. #16
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    Jan 2004
    Location
    Lancaster PA
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    67,591
    Depends on outdoor humidity. And varies with the HP a bit.

    Generally under 40°F. but once in a while it can happen above 40.
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  4. #17
    Join Date
    Mar 2003
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    7,321
    most homes in Bucks county have a plenum on top of the furnace which feeds a tee and goes in both directions to feed the conditioned space. You could easily install strip heat in each side of the tee, and interlock those so that on a call for defrost, these are enabled, and controlled off of discharge air temp. These could be staged for better control, or even done with an SCR if you want to get real fancy. Depends on which part of bucks you live in and how big your lawn is I suppose.....

  5. #18
    Join Date
    Sep 2002
    Posts
    12,144

    I'm trusting the EAC's to keep the strip heaters clean

    One problem with the strips before the evap coil is that then I can't use it for reheat.
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  6. #19
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    Jan 2004
    Location
    Lancaster PA
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    67,591
    No, but pre heat can still increase humidity control.
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  7. #20
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

    *

    Quote Originally Posted by Poodle Head Mikey View Post
    One problem with the strips before the evap coil is that then I can't use it for reheat.
    i seem to remeber a lot of your posts about reheat (i assume for dehumidification) or to cut down on system cycling

    strip heat makes for some very expensive reheat

    you ought to look into heat pipe technology

    it cost zero to operate heat pipe reheat!

    i used to be involved with the installation of heat pipes in miami fl.

    look at this link for kicks, its very interesting, of course initial installation is a bit pricey

    http://www.heatpipe.com/



    .

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