[GSBN] blowin heat below the slab

[Derek Roff]

Perhaps I am misunderstanding something, but this seems like a lot of labor and materials to build a floor that is uncomfortably cool to bare feet, and would be continuously dragging down the desired temperature of the living space.  Can you explain why Pascal (or anyone else) might find this advantageous?  

Derelict

Derek Roff
derek at unm.edu


On Jan 27, 2012, at 4:29 AM, contact at lamaisonenpaille.com wrote:

> Pascal Thepaut, a french SB builder of the first hour just called me to share some details on system that uses the heat from the roof to heat the slab. Pascal used this in his own recently build SB home and is happy with the result. He put in probes to mesure what goes on and in about half a year he should be able to read the data over the timelap that is necesary for the system to be fully operational. He expects the floor temperature to stabalize arround 16°C as this is what has been the result of previous projects where this system has been used. Pascal's house is in Brittany. This is west point of France that sticks out in the ocean, it has a mild and somewhat rainy climate. As they jokingly say over there: "In Britanny they have nice weather several times a day".
> 
> Here is a description of Pascal's setup:
> The vented airspace below the roof alows the hot air to come into a box at the top. From there, when the temperature attains 22°C 2 fans blow the air in the 2 loops at about 90cm deep.
> Soil was escavated to 1m
> 10 cm sand
> PVC pipes (2 loops)
> Base walls of insulative clay bricks + cork insulation on the inside
> Rubble and earth infil, compacted in layers of 10 cm. A total of about 70m3
> Lime-crete (reinforced with bamboo)
> tiles (white)
> 
> If I get more data I will gladly pass it on.
> 
> André - may recyled heat warm our hearts - de Bouter
> 
> PS. Thanks Martin Oehlmann for getting Pascal to call me.
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