| With the growing global energy crisis,energy conservation has become a strategic goal in China.Due to poor design and operation management,internal airflow has inadequacies resulting that energy waste is very serious.Because of the high large gymnasium storey,interior space exist "chimney effect".The temperature of lower space is lower than the temperature of upper space.Staff activity region is generally in lower space and lighting and roof cooling load is generally in the upper space.These features determine the targeted airflow distribution program.Due to height difference of the presence of the front seat and rear seat,rear seat cooler air is easy to drain down,causing uneven distribution of hot and cold.Airflow distribution program designers need to solve these problems.To solve the above problem,experimental tests and numerical simulation method are used in this study.More superior air distribution program is elected,and on this basis,the selected program is improved.Research has shown that supplying from below is more energy-efficient for large gymnasium.On this basis,the airflow distribution program has once again been improved.When attendance is below 70%,cold air from the lower part plus radiation is used for eliminating space cooling load.When attendance is less than 70%,air from lower part is only used to eliminate the cooling load.Comparing with the program supplying air from higher,programs using the program supplying air from lower and improved program can save cooling capacity 14.4% and 25%,respectively.In case of operating 8 hours one day,using three programs the air conditioning system costs are 9849 yuan,8435 yuan,7375 yuan.The research is intended to provide reference for design engineers for designing air distribution.In the actual project,it is necessary to consider a variety of factors about thermal comfort,air supply and the effectiveness of energy-saving to choose the best airflow distribution program in line with the actual engineering. |
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