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aphalt heat gain

jp_2
jp_2 Member Posts: 1,935
in THE MAIN WALL
as far the the use of "gain" there isn't any.

but the black surface should be about the same as the solar power delivery in you region, watts/sq meter.

Comments

  • Michael_6
    Michael_6 Member Posts: 50
    asphalt heat gain

    anyone have any calculations as to how many btu's can be gained per square foot of asphalt driveway with 3/4" pex 9" on center. curious to know if anyone has done this or is there anywhere to find a chart to show btu's per square with full sun at what outdoor temp, wind speed etc. Any info at all would be helpful
  • Unknown
    Unknown


    we've seen it, it's very significant in some cases. no calcs but I imagine solar design manuals would be a good place to start.
  • Jim Bennett
    Jim Bennett Member Posts: 607
    Do a search.....

    for "Solar Driveway" on this site.

    I believe Mad Dog has done this.

    Jim

    There was an error rendering this rich post.

  • Unknown
    Unknown


    what do you mean there isn't any?

    we were pulling 115 on a cloudy day from a driveway in MA.
  • jp_2
    jp_2 Member Posts: 1,935
    misunderstand

    gain should imply amplification.

    if the sun delivers 100watts/sq meter in your area, the asphalt will produce less than 100 watts, if it picked up 110watt/sq meter then you would have gain.

    maybe what the poster is really asking for is emissivity?
  • Unknown
    Unknown
    Lehigh UNiverstiy

    did a study at Mario Andrete's house and figured everything at 127 BTU/sq ft. Angle was slightly off from Logitude for max gain.
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