by hvacman » Mon 18 May 2015, 16:40:45
$this->bbcode_second_pass_quote('', 'I') still consider low temp geothermal recovery to be one of THE biggest potential energy saving techs in the US.
Just to clarify, the GSHP industry has increasingly changed from using the phrase "geothermal" to "ground source". At shallow depths below 300' (in most cases) ground temperature is influenced much more by the average annual surface temperature and the solar "heat from above" than geothermal heat conducted "from below". I guess you could say it is more "heavenly" than "hell-ish". Of course, that is not what the "ground source" borefield driller said when he hit those pockets of undocumented old lava flow rock 200' down that no one expected.
The problem with ground source is the cost of the bores. It is a lot less popular around here now than back in the early 2000's. Borefield costs have more than doubled and there are some increasingly-good/efficient air-source heat pump alternatives. Maybe with all these rigs stacking, the cost will come down again with a lot of unemployed hands looking for SOMETHING to do drilling-wise. That's how we got some great GSHP drilling deals when I first got into the GSHP side of things in the late 90's - unemployed gas/oil drillers who came up to northern California to tap into the GSHP craze. I think a lot of them lost their shirt on that, too. Drilling's a tough way to make a living, that's all I can say.
That's scary stuff about hitting NG at 46 feet just for drilling a water well. Seems EVERYTHING is bigger/more exciting/more dangerous in TX!
Quick question -what does "swab in" mean? OK - a not so quick follow-up question - And if a water driller does hit a shallow NG pocket on the way down to an aquifer, what do they do to protect themselves while drilling and develop the water well further down, and protect the owner from all sorts of nasty things in the future, like that flammable water people show off to attack fracking in PA?