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Could you please send me calculation details for SPECIFIC HEAT EXTRACTION RATE [Btu/(hft)]?

April 26, 2017calculation extraction heat hft rate send

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Could you please send me calculation details for SPECIFIC HEAT EXTRACTION RATE [Btu/(hft)]?

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A. It is the heat rate extracted from the ground divided by the total length of borehole heat exchangers (in EED, the monthly value for peak heat load re-calculated for the ground side using the SPF, and then divided by total BHE length). An example in SI: Peak Heating load in February 15 kW SPF = 4 Heat extraction rate on ground side 11.25 kW Total BHE length 225 m Specific heat extraction rate = 11250 W / 225 m = 50 W/m The same for English units, in BTU/hr and ft instead of W and m.