My question is about the ground source heat pums with closed loop vertical DX heat exchangers.Depending on the required capacity we have different numbers of boreholes where we put the DX U-tube heat exchanger.My question is how can I calculate the heat that is stored in each of the boreholes-how much heat can be exctracted from the borehole normally depending from the type of soil?Is there any formula?

Thank you in advance
I.Seso

I can tell you that I have been told each hole is needed to provide one ton of cooling or heating heat transfer *(12,000 BTU's) Three tons = three holes.

Plus the ground water has to be capable of providing the 12,000 BTU on a continuos basis. It would be best to check with someone local in regards to capacity because it does change for different areas.