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Thread: pool deck heating

  1. #1
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    pool deck heating

    Live in Texas.
    I want to know how to calculate heat gain on a hydronic system that is imbedded in the pool deck. Sun warms the deck quite a bit in the spring while pool water is cool. Like to use the deck to funnel heat into pool water.

  2. #2
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    Could not find any directly applicable information on the web.

    My thoughts? Install the tubing on 8" centers design flow as you would for radiant heating. (program like Wrightsoft might be able to be coaxed into giving you real #'s for heat loss/gain) If you power the D.C. circulator with a solar panel directly it will match the sun's output fairly closely. Put a thermostat in the pool to kill the pump when desired water temp is reached. Max effectiveness would be achieved by adding a bit of insulation under the slab. Some of the "bubble" stuff used for radiant would do it.

    Could be a fun and educational project! Keep in mind that in the UAE, Bahrain, etc they have to COOL their pools as the ambients can be 120F on a regular basis..

    Another thought would be to do a de-superheater on your homes AC system to add heat to the pool. Easy HX idea: Embed the copper directly into the pool shell, just make sure you have a coating on the copper to protect from corrosion.
    “A dying culture invariably exhibits personal rudeness. Bad manners. Lack of consideration for others in minor matters. A loss of politeness, of gentle manners, is more significant than is a riot.”
    ― Robert A. Heinlein

  3. #3
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    Thread Starter
    Conversely, how much heat would it take to raise concrete surface to 115 degrees if you have 75 degree fluid.
    Just think in reverse to figure how much heat you can obtain from hot concrete

  4. #4
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    Don't do it. Contraction and expansion of the tubing under the deck will soon cause expensive problems. If you want to save money on heating your pool look us stand alone pool heat pumps. They can easily be added to your exiting and serviceable pool heating piping.
    "The American Republic will endure until the day Congress discovers it can bribe the public with the public's own money.
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  5. #5
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    Quote Originally Posted by DeltaT View Post
    Don't do it. Contraction and expansion of the tubing under the deck will soon cause expensive problems. If you want to save money on heating your pool look us stand alone pool heat pumps. They can easily be added to your exiting and serviceable pool heating piping.
    Yea,I thought of that. But how do the sidewalk ice melters in snowregions keep from damaging sidewalks?

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  7. #6
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    The driveway concrete is designed for that contraction/expansion. Plus the in house control system feeds controlled low temperature water through the system tubes and is kept at a fairly low temperature as to melt the snow/ice but not crack the concrete.
    "The American Republic will endure until the day Congress discovers it can bribe the public with the public's own money.
    - Alexis de Toqueville, 1835

  8. #7
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    The tubing circulating pol water will keep the deck at a more even temperature and LIMIT expansion and contraction.... No cooling, concrete gets hot during the day and cool at night. Simple thermodynamics.
    “A dying culture invariably exhibits personal rudeness. Bad manners. Lack of consideration for others in minor matters. A loss of politeness, of gentle manners, is more significant than is a riot.”
    ― Robert A. Heinlein

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  10. #8
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    Quote Originally Posted by DeltaT View Post
    The driveway concrete is designed for that contraction/expansion. Plus the in house control system feeds controlled low temperature water through the system tubes and is kept at a fairly low temperature as to melt the snow/ice but not crack the concrete.
    During icy weather, what is tubing fluid temperature is circulating?

  11. #9
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    Quote Originally Posted by timjimbob View Post
    During icy weather, what is tubing fluid temperature is circulating?
    Glycol Ice melt systems can be ambient, 10, 15 20, 25°F. It is S L O W L Y heated and circulated.

  12. #10
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    Quote Originally Posted by pecmsg View Post
    Glycol Ice melt systems can be ambient, 10, 15 20, 25°F. It is S L O W L Y heated and circulated.
    Confused, all these temperatures are below freezing

  13. #11
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    Quote Originally Posted by timjimbob View Post
    Confused, all these temperatures are below freezing
    Yes, you said Snow Melt. They don't run 24/7. There started after the snow begins to fall.; The system I had in Colorado was to melt what was remaining after plowing and shoveling after the storm was over.

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