Radon modelling and the heat transfer surface area of the British hot dry rock geothermal reservoir |
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| Authors: | N Hussain |
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| Institution: | (1) School of Chemistry, University of Bath, Bath BA2 7AY, UK;(2) College of Marine Studies, University of Delaware, 19716 Newark, DE, USA |
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| Abstract: | A simple thermal model is developed to evaluate the heat exchange surface area of a hot dry rock geothermal reservoir. This
model, in conjunction with the Rn model of Andrews and coworkers, is applied to RH12/RH15 system of the British HDR reservoir.
Results suggest that although the estimated Rn transfer surface area represents the actual swept surface area, it is between
25 and 45 times larger than the heat transfer surface area. The difference is explained as due to clustering of several fractures
within a range of thermal interaction, over the duration of the circulation. It is also shown that the decline in the measured
temperatures of circulation fluids since 1985 to the present is consistent with the heat exchange surface area going through
a maximum in 1987. |
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| Keywords: | Radon modelling heat transfer surface area hot dry rock geothermal reservoir thermal model radon transfer surface |
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