BBP,
A very nice write up, but I believe the basic concept is not applicable for many.
The basic idea is that stored BTU's (in the form of solar heat) can be stored in the ground and that this heat remains in place to later be extracted.
In many (most?) locations, migrating ground water will move this delivered heat away from the introduced heat site.
However, if the geology is stable (rock), with little ground water movement (or even a water table), this concept of stored heat can work.
But I suspect that this concept of heat storage/extraction will work in only a fraction of locations.
If ground water is available within 50-60 feet of surface (15-20 M), then I doubt it will work as lateral water movement is surprisingly fast.
Respectfully,
Steve
__________________
consulting on geothermal heating/cooling & rational energy use since 1990
|