Suitability evaluation of shallow geothermal energy development model based on variable weight theory

Abstract

With the rapid development of ground-source heat pump (GSHP), it is necessary to evaluate the suitability zoning of shallow geothermal energy, which is in order to avoid the waste of resources and the restriction of popularization of GSHP. However, due to the difference between geology and hydrogeology, the conventional evaluation method of shallow geothermal energy suitability is prone to the poor accuracy of index weight and non-accuracy and does not conform to the objective facts. Therefore, this paper takes Chengde area as the research area to construct the evaluation system of vertical ground source heat pump (VGSHP). Based on the variable weight theory, combined with analytic hierarchy process and fuzzy C-cluster analysis, ArcGIS is used to evaluate the suitability of VGSHP in Chengde area, and the zoning map of variable weight and constant weight suitability evaluation is obtained. Combined with the actual conditions for shallow geothermal energy (SGE) development, the accuracy of the suitability evaluation of shallow geothermal energy development based on the theory of variable weight is verified by comparing and analyzing the variable weight diagram and the constant weight diagram.