Friday, April 30, 2010

More thoughts on Interseasonal Charging

30 April 2010: Chris Wood says that for the mass of clay that our boreholes reach, you can continue pumping heat down there and we should not be alarmed if the temperature reading does not rise dramatically - the whole point of this experiment is to 'move the heat outwards'. There is so much thermal mass that is building up nicely, but very slowly. We can guarantee that this soil will never chill, and that is an achievement in itself.

The only way we could have a significant rise in the temperature would be if the ground was fully enclosed in a swimming pool size box of rock or earth, insulated by vast amounts of polystyrene. This would cost vastly more than the boreholes we now have, so you have to balance off the advantages and disadvantages.... and would it be enough to get through the winter for a house of this size?
   Even the vast storage water pond at the headquarters of Renewable Energy Systems, Beaufort Court has the top heavily insulated with half meter of insulation, but is uninsulated below to permit surplus build up of heat to warm the soil below, without distance limit. See the Beaufort PDF. Image from their website.
That prevents it overheating, but also provides an additional source if the water source is too cooled in winter. They claim that this is a 'World First', and I have been there and seen it myself.
    If we ONLY had heat in the summer and had to store it all winter, then Interseasonal charging would be vital, but we have enough evidence from the cold days of March, and from the photovoltaic statistics to see that there is plenty enough winter sun (with our vertically oriented panels) to top up continuously throughout the winter.

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