ground source and hydronic cooling recommendation [RE-wrenches]

[Kurt Albershardt]

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--On Saturday, February 07, 2004 6:17 PM -0800 "Dean T. Newberry" <deant at dcn.org> wrote:
>
> The heat capacity of dry sand is .2 that of water the thermal conductivity is similar. I strongly recommend using the guidelines of the RPA and IGSHPA. I talked to a GSHP dealer in Phoenix AZ who closed down his AC business and bought a Postbox business because the conductivity and capacity of dry sand made the business model fail.  The GSHP systems in CA that have been tested in 200 foot bores 1 per ton, run excessive return water temperatures ~120 degF at peak air conditioning load conditions I cannot recommend using a sand box as a thermal storage device, and the IGSPHA guidline designs in this climate zone have serious problems at limit conditions too.  Fine homebuilding sells advertising, not houses.

I should mention that my plan is to pull fresh air through a 100' culvert (3-4' diameter?) buried ~5' underground as a first stage, which will then feed evaporative cooling for the Summer and provide fresh air for the other months.




> The most comfortable systems are the radiant chilled ceiling, radiant heated floor homes with good radiant and conductive insulation. Condensation in cooling is always a concern. Use glazing appropriate for the climate. Use plant shading appropriate for the climate
>
> I am using Valance convectors for heating cooling distribution, evaporative precooled high performance AC systems

Any pointers on chilled ceiling setups?  Does one or more of the books I listed cover this or is there another good reference?





--thanks

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