Heat Transfer Effect of Mid to Deep Geothermal Single Well in Chengde Area
Geothermal resource,as a green and renewable energy resource,is one of the important alternative energy resources in the future.Single well heat exchange in mid to deep geothermal ener-gy is a new technology for developing geothermal energy.Based on the geothermal geological charac-teristics in Chengde area,a coupled heat transfer model between a single well heat exchanger and the surrounding rock mass is established by using COMSOL Multiphysics numerical simulation soft-ware,and the influence of thermal conductivity of the inner tube and cementing cement on the outlet temperature and heat transfer efficiency is analyzed.The research shows that thermal conductivity of the inner tube has a significant impact on the heat transfer effect.The smaller the thermal conductiv-ity of the inner tube is,the higher the heat transfer efficiency of the system becomes.A new type of aerogel insulation material can be selected to replace the traditional PE pipe material to improve the heat transfer performance of the system;when the thermal conductivity of cementing cement and rock mass is close,the enhanced heat transfer effect is significant.In specific engineering,new cementing ce-ment should be studied based on the thermal conductivity of rock mass to make the thermal conductivity of the two close,which helps to reduce the impact of cementing cement on heat transfer efficiency.
single well heat transferthermal conductivityheat transfer effect
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