Feasibility Study On Factors Affecting Indoor Thermal Environment And Upper Space Heat Recovery In Large Space Buildings During Heating Season

With the development of economy,large space buildings such as airport terminals,railway stations,large industrial plants and theaters have been developed rapidly,with increasing numbers and expanding application fields.Due to the high spatial height and large indoor area of large space buildings,the traditional heating methods can hardly meet the needs of thermal comfort and energy saving.In order to optimize the indoor thermal environment of large space buildings during the heating season,this paper conducts a numerical simulation study on the indoor thermal environment of typical large space buildings during the heating season and analyzes the influence of different factors on the indoor thermal environment of large space buildings during the heating season.In view of the prevalent thermal stratification phenomenon,a technical solution to recover heat from the upper space of large-space buildings is proposed and the feasibility of the solution is studied.The main work of this paper is as follows:Three typical factors affecting the indoor thermal environment of large-space buildings during the heating season were analyzed.A mathematical model of indoor thermal environment in large space building during the heating season was established,and the proposed mathematical model was verified.The simulation results were compared with the measured results and found to be in good agreement,which proved the correctness of the established mathematical model of indoor thermal environment of large space building during the heating season.Based on the established mathematical model of indoor thermal environment of large space building during heating season,the indoor thermal environment of large space building with two heating methods of displacement ventilation + radiant floor(DV+RF)and mixed ventilation(MV)is studied.The results show that the increase of outdoor ambient temperature,the use of air curtain and the appropriate increase of airflow velocity at the air outlet are conducive to the improvement of indoor thermal environment in large space buildings during the heating season.The upper space heat recovery scheme is proposed for large space buildings with mixed ventilation(MV)heating method and the feasibility of the scheme is studied.By comparing the indoor environmental parameters of the large space building before and after the implementation of the heat recovery scheme,it is found that the implementation of the heat recovery scheme has a positive effect on the improvement of the indoor thermal environment of the large space building under different working conditions.In summary,the research on the factors influencing the indoor thermal environment of large space buildings during the heating season in this paper will provide a reference for the optimization of the indoor thermal environment and the improvement of the heating method.The proposed indoor thermal environment optimization scheme of upper space heat recovery to alleviate the thermal stratification phenomenon in large space buildings has good effects and can provide ideas for the improvement and optimization of indoor thermal environment in large space buildings.