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Mikesolar · 01-19-15, 04:40 PM

BBP, have a look at the system. These systems are not using a traditional bore hole. Some of them insulate a very large pit which is filled with earth and lots of tubing. Water table is not as relevant. The one Randen is talking about is near Calgary, Alberta and can it be very cold. I've been there to see it a number of years ago and it works pretty well. There are 50+ systems like these in Europe as well.

That said, It is really questionable whether it is worth adding heat to the borehole in a regular GSHP. I think way too much of the heat will be lost to the environment......UNLESS.....there is as much input from the collector area as output to the HP. Just my 2 cents.

01-19-15, 04:40 PM	#13
Mikesolar Master EcoRenovator Join Date: Aug 2012 Location: Toronto Posts: 958 Thanks: 40 Thanked 158 Times in 150 Posts	BBP, have a look at the system. These systems are not using a traditional bore hole. Some of them insulate a very large pit which is filled with earth and lots of tubing. Water table is not as relevant. The one Randen is talking about is near Calgary, Alberta and can it be very cold. I've been there to see it a number of years ago and it works pretty well. There are 50+ systems like these in Europe as well. That said, It is really questionable whether it is worth adding heat to the borehole in a regular GSHP. I think way too much of the heat will be lost to the environment......UNLESS.....there is as much input from the collector area as output to the HP. Just my 2 cents. Last edited by Mikesolar; 01-19-15 at 04:43 PM..