Research on heat extraction performance of deep U-type borehole heat exchanger
Based on the open-source numerical simulation software OpenGeoSys,a 3D numerical model is established,which fully considered the size characteristics of deep U-type borehole heat exchanger(DUBHE)and the distribution of complex geological parameters.The effect of factors affecting the hourly circulating temperature of the DUBHE and the long-term heat extraction performance are analyzed in this study.The thermal performance test results show that the outlet temperature of the DUBHE drops rapidly in the initial stage of operation,and gradually stabilizes in the later stage of operation.The sensitivity analysis shows that the geothermal gradient,drilling depth of the descending and ascending wells,and the length of the horizontal well have significant effects on the performance of DUBHE.The relevant conclusion will be conducive to guiding the project design and application.
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