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Re: geothermal heating/radiant flooring/domestic hot water
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Posted by Robert Gammon on Friday, 2 May 2008, at 6:22 p.m.,
in response to Re: geothermal heating/radiant flooring/domestic hot water, posted by Phil
I have since read some articles that suggest that radiant cooling of the slab can be quite effective, IF, it is ALSO coupled with an air handler that can dehumidify the air.
Floor temp will hover around 67F, lower than 66F and condensation can occur. Dehumidification as the RH needs to hover near 45%. Higher than this and again, condensation can occur.
In areas that need little AC in the summer, this could be a viable strategy. Still, 67F floors will be a bit cool to the toes, so socks would appear to be the order of the day and night in such a structure.
With our relatively intense summers, I wonder of Bill and I could do this. Yet, an airport like Bangkok has tried this in the terminal and it appears to work well there (although I have not personally visited so I cannot comment on the long term comfort of the building)
The air coil that Phil mentions above will not work as well as the water inside is at a much higher temperature than if R22 or R410 refrigerant was flowing inside.
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This site is all about building a cool, energy efficient house, that makes maximum use of earth sheltered design, passive solar heating and cooling, geothermal exchange energy management, and right sizing of the house for it's designated use. The home's placement is on a south-facing hillside in Deep Creek Lake, Maryland. This site describes the design process, the technologies used and the expected results. We also have a comprehensive Links Page for anyone who is also interested in designing a similar project.