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  1. #14
    Join Date
    Feb 2012
    Posts
    42
    beenthere, that's awesome; a quick look at a psych chart makes
    it make sense, except that the chart I usually use only goes
    down to 20F. Still, clearly not a whole lot of grains to be
    had in air that cold but they're obviously in there, and I
    guess I need to think of the lower end of the dewpoint line
    as the "hoarfrost line".

    This morning it is, in fact, about 15F but the RH widget hung
    outside says the humidity is higher than a few days ago, and the
    outdoor unit is definitely collecting a bit more white than
    when I began this thread. I think it's nominally about 1200
    CFM out there but it's a variable-speed fan so who knows. I'm
    sure I could sit here and try to do the math and run out to put
    a pan underneath to see many pints of water dribble out on every
    defrost cycle and how long between ... but who's got time.

    I guess I can just hope that the thermal mass of the compressor
    and the fairly fat blankie wrapped around it will let the unit
    ride through most power outages, but I was originally thinking
    days-long and what if I'm not home the whole time, etc. You'd
    think one more thermistor stuck to the herm case to make sure
    it's up to a safe temp before cranking it would be an easy bit
    of insurance that manufacturers could put in, though..

    _H*

  2. #15
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,923
    I believe manufacturers think that if you are without power for a day or more. You know to switch the thermostat to emergency heat before the power comes back on, to give the compressor time to warm up.
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  3. #16
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,923
    Quote Originally Posted by NY2GA01 View Post
    Do you: live, eat, sleep breath psychrometric.
    ROFL. No, a spread sheet makes the calcs easy.
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  4. #17
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,595
    Ok so that wasn't near as bad of a formula as I thought it was going to be. I could actually handle that.

  5. #18
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,923
    Quote Originally Posted by ryan1088 View Post
    Ok so that wasn't near as bad of a formula as I thought it was going to be. I could actually handle that.
    I only do the easy formulas. Hate when I gotta use pie and sq rts.
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  6. #19
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,923
    Quote Originally Posted by ryan1088 View Post
    Ok so that wasn't near as bad of a formula as I thought it was going to be. I could actually handle that.
    I only do the easy formulas. Hate when I gotta use pie and sq rts.
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  7. #20
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,595
    Quote Originally Posted by beenthere View Post
    I only do the easy formulas. Hate when I gotta use pie and sq rts.
    That isn't too bad either but when we start talking derivatives and math not using a calculator, I'm out.

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