Boundary Constraint Study on Air Supply Parameters of Subway Platforms Considering Environmental Non-uniformity
As the problem of"high energy consumption and low energy efficiency"of the air conditioning system in subway stations is becoming prominent,the air-water linkage becomes the trend of optimization,and a boundary constraint method considering the non-uniformity of the environment is proposed to address the poor thermal comfort and waste of cooling capacity.Based on the Realizable k-ε and Species Transport model,we numerically simulate the environment of the platform,analyze the influence of airflow organization on the thermal and humid non-uniformity of the platform,and the coupling mechanism of the air supply parameters on the platform temperature,relative humidity,and wind speed,and use the nonlinear least-squares method to fit the constraint boundary of the air supply parameters,and further investigate the influence of the air supply speed,personnel load,and the number of air outlets on the constraint boundary,and further investigate the influence of the air supply speed,personnel load,and the number of air outlets on the constraint boundary.The influence of air supply speed,personnel load and number of air outlets on the constraint boundary is further investigated,and the effect of the boundary constraint method considering the non-uniformity of the environment on the control accuracy of thermal comfort and energy-saving potential is compared and verified.The results show that:when the design temperature ta is certain,the air supply temperature and the air supply speed satisfy the constraint relationship t=a+bta-c/v;the lower the air supply speed is,the larger the deviation of the constraint boundary caused by ignoring the environmental nonuniformity of the station;the constraint boundary considering the environmental nonuniformity improves the control accuracy of the relative thermal index RWI by 0.1;in the air-conditioning season,the cooling savings from considering environmental non-uniformity are 29.75%and 12.04%for the full fresh air mode and the minimum fresh air mode,respectively.The air supply parameter constraint boundary method considering environmental non-uniformity can effectively improve the thermal comfort control accuracy and system energy saving potential,which is of theoretical significance for the air supply parameter boundary constraints in the optimal control of air-water linkage.
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