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  1. #1
    Join Date
    Nov 2012
    Location
    Columbia, Maryland. U.S.A.
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    252

    Default Dendrology question

    I have heard of the large quantity of water to pass through tree on hot day. Would one expect this to pull significant heat out of Apis nest in hollow ? Mostly from sides, greenwood ?
    Cheers,
    Drew
    p.s Seems fair enough to me, but alas, as with thermodynamics, I am frustrated by ignorance
    Last edited by Maryland Beekeeper; 01-19-2013 at 09:06 AM.
    "Nature does nothing uselessly." Aristotle

  2. #2
    Join Date
    Dec 2005
    Location
    Brasher Falls, NY, USA
    Posts
    28,084

    Default Re: Dendrology question

    No, I wouldn't.
    Mark Berninghausen
    Squeak Creek Apiaries



  3. #3
    Join Date
    Oct 2012
    Location
    Mercer County, Kentucky, USA
    Posts
    10

    Default Re: Dendrology question

    The water passes through vessels (hardwoods) or trachaeids (softwoods) that occur in the living part of the tree. These are structurally isolated from the living/dead tissues that form the walls of the cavity. Cooling would only take place at the surface of the leaves or needles where the water changes phase from liquid to vapor as it is transpired from the tree. The result - no heat lost to the combs.
    Last edited by pkalisz; 01-19-2013 at 09:52 AM. Reason: spelling mistake

  4. #4

    Default Re: Dendrology question

    Quote Originally Posted by pkalisz View Post
    Cooling would only take place at the surface of the leaves or needles where the water changes phase from liquid to vapor
    Not totally the case. The conversion from water to vapor may be the point of greatest cooling, but travelling from the cooler underground to those leaves it will also absorb heat from the surrounding tissue. To my thinking...not enough to substantially cool the bee nest but it will remove some of the heat.
    All you have to do to test this is to fill a bathtub with cold water and jump in. The water will chill you quickly....even without any significant evaporation.
    Dan www.boogerhillbee.com
    Experience is a hard teacher because she gives the test first, the lesson afterwards

  5. #5
    Join Date
    Dec 2010
    Location
    Huntington ,VT, USA
    Posts
    258

    Default Re: Dendrology question

    I wouldn't dismiss it outright. There is a heck of a lot of water on a good size tree moving up on a hot day. That water is being drawn at soil temp, which is a fair bit cooler than air in summer midday.

    But I think the wood itself wood insulate against any significant heat exchange at that small temperature differential. Maybe in a full sun situation it would reduce solar gain from the exterior, but I just don't see it pulling heat from the interior.

  6. #6
    Join Date
    Nov 2012
    Location
    Columbia, Maryland. U.S.A.
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    252

    Default Re: Dendrology question

    My understanding to is that there is a heck of a lot? of water movin and its got to be @ least cool? coming up, this would make for a nest in a cool water jacket ? Like they plug the athletes into Be very curious to know, if the hive is 95, I would think the water going by although insulated, could be a big help. Perhaps the water pushes right up against the back side of that prop. all around ? I've got a dissected poplar trunk/nest, looking @ cross section it seems possible, but I'm no dendrologist
    Last edited by Maryland Beekeeper; 01-19-2013 at 02:05 PM.
    "Nature does nothing uselessly." Aristotle

  7. #7
    Join Date
    Dec 2005
    Location
    Brasher Falls, NY, USA
    Posts
    28,084

    Default Re: Dendrology question

    I know that according to the calendar it is the depth of Winter, but, really, this is what you are concerned about?
    Mark Berninghausen
    Squeak Creek Apiaries



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