Research On Improvement Of Indoor Thermal Environment In University Gymnasium

With the overall improvement of the material level,fitness through sports activities has become the choice of many people,and buildings such as gymnasiums have become one of the important public buildings in the city.For university gymnasiums,in addition to being used during competitions,they also have to undertake non-sport activities such as school student gatherings and opening ceremonies.The airconditioning design should not only meet the comfort of sports and viewing in the stadium,but also meet the requirements of large-scale school gatherings.Comfort at the time.However,when the air conditioning system of an already constructed gymnasium is modified,it is difficult to use seat air supply.It is necessary to adopt a new air conditioning system to supply air to meet the requirements of the use of the gymnasium without changing the structure of the building.Comfort.Based on the above background situation,this research conducted a research on improving the indoor thermal environment of the Hunan University Gymnasium,which originally used hot pressure ventilation for cooling.Summarized and analyzed common passive cooling forms and working principles,summarized and compared and analyzed the air flow organization form of active cooling air conditioning.According to the actual situation of the building,two passive optimization schemes and two active optimization schemes of air flow organization form were selected.The Fluent software was used to simulate the model under the condition of no audience,and the validity and reliability of the model established by this research were verified through actual measurement;Then through numerical simulation,the airflow organization of the four optimization schemes under the opening ceremony conditions of 100% attendance was simulated,and the most effective optimization scheme was selected through comparative analysis.The research results are summarized as follows:When the passive optimization scheme is used to cool the gymnasium,it is susceptible to the influence of outdoor temperature.In summer,the outdoor temperature is relatively high.As a result,the cooling effect of the passive optimization scheme is quite different from that of the active optimization scheme,which cannot meet the regulations.Temperature requirements.The cooling effect of the optimized plan to expand the air inlet area is better than that of the installation of an unpowered hood.The average temperature of the auditorium area should be nearly 1℃ lower.When the passive cooling improvement plan of installing air-conditioning equipment cannot be carried out in the gymnasium,it can be Consider the indoor thermal environment improvement plan that expands the air inlet area.The installation of a non-powered hood can optimize the airflow distribution in the gymnasium,and the installation of a non-powered wind balloon on the roof can be considered when the indoor wind environment is modified.The single-direction side-feed and side-return airflow organization has a poor cooling effect on the fixed auditorium area,and the cooling load of the active auditorium(competition area)does not appear frequently.When there is no cooling load in the active auditorium(competition area),it will cause energy Waste occurs.The partition side delivery side return can cool down the fixed auditorium and the event auditorium(competition area)at the same time.When there is no cooling load in the event auditorium,the air supply nozzles above the competition area can be closed to save energy consumption.By improving the air supply temperature of the partitioned air supply nozzles,the air supply temperature of the air supply nozzles above the active auditorium area(competition area)is adjusted to 24°C,and the air supply temperature of the air supply nozzles behind the fixed auditorium is adjusted to 22°C,When the air supply rate of a single nozzle is 4500 m ~3 /h,the average temperature of the auditorium is between 26℃-28℃,and the air velocity is not more than 0.5m/s,which meets the requirements of the design specification.It can provide a certain reference basis for the improvement of the indoor thermal environment of such gymnasiums.