Optimization Of Non-interfering Geothermal Energy Cascade Utilization System

With the development and utilization of various fossil energy sources,the problem of air pollution is becoming more and more serious.Under this background,the geothermal energy with abundant reserves,pollution-free and continuous stability stands out,and geothermal heating has become a topic of concern.With the continuous development of geothermal energy technology,relying on 200-3000 m of medium-deep geothermal energy to achieve building heating has become a new research direction in the field of geothermal heating.The proposed non-interfering geothermal energy cascade utilization system can realize the building heating of medium-deep geothermal energy,but its geothermal utilization efficiency is not high.In order to improve its geothermal utilization efficiency,this paper is aimed at the actual working conditions of the geothermal heating project.The TRNBuild software was used to calculate the hourly heat load of the heating building,and the TRNSYS software-based non-interfering geothermal energy cascade utilization system was built.The simulation results were basically consistent with the actual heating conditions after comparison with the actual working conditions.The non-interfering geothermal energy cascade utilization system is used as the simulation test platform,the influence law of different structural parameters on the outlet temperature of the medium-deep Coaxial buried tube downhole heat exchanger is obtained,and the existing structure design and parameters of medium-deep Coaxial buried tube downhole heat exchanger was optimized,increased its outlet temperature by 8?.In addition,the heating conditions of the non-interfering geothermal energy cascade utilization system under different operating parameters are simulated,such as geothermal well return water temperature and circulating flow of ground source circulatory system.According to three evaluation indexes of heat extraction,heat pump COP and equipment power consumption,the optimization analysis provides a reference for the operation parameter setting of the actual heating of non-interfering geothermal energy cascade utilization system,and has certain engineering practical significance.