Interpretation of Temperature Performances at Co-axial Ground Heat Exchangers in Heterogeneous Formations

概要

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A new simulation model for co-axial ground heat exchangers was developed to simulate the temperature behaviors of heat exchangers in heterogeneous formations. In the simulation model, the formation is vertically discretized into sub-layers and the cylindrical source function is applied to each layer. A nonlinear regression method, the polytope method, is applied to the simulation model for automatically estimating the vertical distribution of thermal conductivities along the heat exchangers. The reliability of the new procure is validated with the results of thermal response test conducted using fiber optical temperature sensors. The calculated temperature performances and vertical temperature profiles agreed well with the thermal response test results. The estimated distribution of thermal conductivity also correlated well with the geological and groundwater information around the ground heat exchanger.
日本地熱学会の論文