Study On Analysis Of Factors Influencing Heat Exchange Performance And Design Optimization Of Earth-Air Heat Exchanger System

With the rapid depletion of the world’s energy reserves in recent years,renewable energy utilization technologies have regained the focus of attention.As a common renewable energy use technology,Earth-Air Heat Exchanger(EAHE)technology has received wide attention from scholars at home and abroad due to its advantages of easy-to-use,energy-saving and green.However,existing EAHE systems generally suffer from poor heat transfer effect and low energy efficiency.Therefore,the optimization of EAHE system can provide technical support for the design of high performance EAHE system,which is of great significance in terms of practical application and theoretical research,and contribute to energy saving and emission reduction to achieve the target of "dual carbon".In this paper,we analyze the factors affecting the heat transfer performance of the EAHE system,and then carry out the design optimization research of the EAHE system.Firstly,the background of the application of EAHE technology is analyzed.The current status of domestic and international research is reviewed from two levels,namely,the study of influence factors of EAHE system and the study of optimization of EAHE system design,and the shortcomings of existing research are summarized.Meanwhile,the heat exchange process of the EAHE system is analyzed.The characteristics of underground soil temperature and the heat exchange process between soil and air are introduced.The mathematical model of the heat exchange process of the EAHE system is constructed and its accuracy is verified.Secondly,based on the constructed mathematical model of the heat transfer process of the EAHE system,the influencing factors of the heat transfer performance of the EAHE system are screened.From the perspectives of heat exchange effect,energy saving and economy,heat exchange efficiency,heat exchange,energy efficiency ratio and investment payback period are selected as the evaluation indexes of the heat exchange performance of the EAHE system.Using the parameter sensitivity analysis method and Pearson correlation coefficient method,the influence law of different factors on the heat transfer performance of the EAHE system,the sensitivity of the factors affecting the heat transfer performance of the EAHE system and the mutual influence between different evaluation indexes were derived.The parameters that should be considered for the optimization of the EAHE system are screened out,which provides the basis for the construction of the design optimization model of the EAHE system.Finally,the NSGA-Ⅱ multi-objective optimization algorithm and TOPSIS multi-objective decision method are used and the optimization method for the design of regional EAHE system is proposed.The design solutions of the EAHE system in Henan Gongyi region under different optimization objectives were obtained.The proposed optimization method is also used to obtain the optimized design scheme of the EAHE system for the Huangye Sancai Heritage Museum by combining the field research and test data of the Huangye Sancai Heritage Museum in Gongyi.The simulation prediction of the operation of the EAHE system of the Huangye Sancai Heritage Museum shows that the thermal and humid environment of the museum site meets its survival needs when the EAHE system is in operation,and the operation of the EAHE system achieves good energy saving and economy.The feasibility and superiority of the proposed EAHE system optimization method are proved.In this paper,the complicated effects of the various influencing factors on the performance of heat exchange of the EAHE system are revealed,and further proposes a design optimization method for the EAHE system,which can provide reference and reference for the design optimization of the EAHE system.