What is 'thermal short-circuiting' in a vertical borehole and how is it mitigated?
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A
Fluid bypassing the heat pump; fixed by adding a check valve
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B
Heat transfer between the supply and return pipes within the same bore; mitigated by using thermally enhanced grout and proper pipe spacing
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C
Electrical short in the pump motor; fixed by grounding
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D
Ground water infiltration into the borehole; fixed by casing