Research on Thermal Comfort and Energy Consumption of Strongly and Weakly Cooled Subway Carriages with Low Personnel Density
Reasonable setting of air supply parameters in strongly and weakly cooled subway carriages is the key to meet the individualized thermal comfort of human body and reduce the energy consumption of air condi-tioning.Based on the numerical simulation of Computational Fluid Dynamics(CFD),a model of strong and weak cooling compartment with density of 0～6 persons/m2 is established,and the change rule of human ther-mal comfort and air-conditioning energy consumption in the low personnel density compartment is obtained through the study of thermal environment of the compartment.The research results show that the air supply temperature is the main parameter affecting the temperature field.In the low personnel density of 0.5 people/m2 when 22～26 ℃,1.5～2 m/s state interval,the velocity field has a large volatility,the wind speed is the main fac-tor affecting thermal comfort.Thermal comfort in the average thermal sensory index is lower at 22～26 ℃ will not be dominated by the temperature field,can only be adjusted by controlling the wind speed,convenient and energy saving.Compared with the conventional strong and weak cold compartments,the air supply tempera-ture difference is set at 2 ℃,and the air supply temperature difference is 4 ℃(22 ℃,1.5 m/s for the strong cold compartments,and 26 ℃,1 m/s for the weak cold compartments),the air-conditioning energy consumption re-duction efficiency has been improved by 21％.In the state of large fluctuations in the velocity field,a more eco-nomical personalized thermal comfort can be achieved to improve the wide range of personalized thermal com-fort for passengers,and provide a reference for the actual operation of rail transit to set the parameters of com-partment regulation.
Thermal ComfortStrongly and Weakly Cooled CarriageNumerical SimulationEnergy Saving
万方数据
维普
