Geothermal Ground Source Heat Pump vs Oil Evaluation - Page 5

 


water/antifeeze would have its loops close to freezing, the refrigerant

system would have to be colder than this, to extract heat and would
therefore operate below freezing. <<

I understand that. I don't measure loop temperature, I have done
extensive measurement and analysis of ground temperature recovery when
the system is off. I also have a temperature sensor installed in a bore
hole, 50 ft. down,  a distance away from the loops so that I can
monitor the ground temperature.


work that well, you are not the best qualified to give anyone else
advise, except to avoid your type of installation. <<

Largely, I agree with you, and avoid posting about things which I know
nothing about. However, the science of GSHP systems is something I've
studied to an extent that I can provide some useful theory for the OP.

If anything I've posted is erroneous/BS, please feel free to cite
specifics. The only thing I regret noting is a $ for an air source heat
pump, since obviously that amount will vary.

 

Astro

Other than having the experience of your own DX system that does not
work that well, you are not the best qualified to give anyone else
advise, except to avoid your type of installation.

 



Your correct, now I remember this one.  Heck, I would have not responded
with my post that doesn't relate to this problem  if I just read the entire
thread :-('

Rich

 

Another question, how can you improve on the thermal conductivity of
the vertical borehole?  Is there any other reliable tubing material
with better thermal conductivity than the regular black plastic well
pipe?  To grout or not to grout?
Also, is there a cheap way to determine the best location for the well
field?  What types of soil conditions?  During the foundation
excavation, I had quite a bit of water coming into the pit and my
neighbor had even more.  Is this a good sign for loop performance?

 

Here's a reference paper showing the effects of groundwater movement on
 performance if your into that:
http://www.hvac.okstate.edu/pdfs/gwflow.pdf

here's another good reference that goes into many of the topics
discussed:
http://www.geo4va.vt.edu/A1/A1.htm

good luck. let us know how it works out.