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Field Measurement and Numerical Simulation on Indoor Air Environment of Shanghai Subway Carriage

Author: ZhuangXiaoZuo
Tutor: KangYanMing
School: Donghua University
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Subway cars Thermal environment Survey Measured Numerical Simulation Zero equation
CLC: U270.383
Type: Master's thesis
Year: 2012
Downloads: 77
Quote: 0
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Abstract

More confined environment of subway cars , the introduction of fresh air in the running process is more limited . Personnel density is too high, can easily lead to the dissemination of harmful material , further deterioration of air quality . In addition, the low temperature in the summer inside , the air velocity is too large , easily lead to hair feeling and cold feeling and cause discomfort . Therefore , this article uses the questionnaire , continuous line measured and numerical simulation study air quality and thermal comfort in the environment of the subway cars . Divided into four time periods for summer 11 line in Shanghai Rail network survey , a larger sample size ( total number of samples greater than 2000 ) . While investigating the subjective feelings of the passengers for the thermal environment of the subway cars , online measured parameters of the the air thermal environment inside . Summer thermal comfort subway cars acceptable temperature range as well as the staff of the neutral temperature value using regression analysis . The results show that the Shanghai subway summer the temperature inside is generally lower than thermal comfort to an acceptable temperature range , thermal sensation of women less than men . Therefore , may be appropriate to increase the the the summer subway car air conditioning operating temperature . In the main metro line dynamic thermal measurements of environmental parameters on the basis of analysis of the winter , the variation of temperature and humidity in the summer and autumn subway cars , to discuss the relationship between the outdoor environment , occupant density , time of day and road sections with compartment thermal environment . Found that the ground line , the temperature inside is mainly affected by the ambient temperature of trains , the external environment for the relative humidity inside the impact is small . Underground lines , the inside temperature is mainly affected by the air conditioning system , the temperature inside the tunnel and personnel density affect the trend of the curve and the temperature curve , relative humidity is more consistent . In the verification of numerical model based on the combination of the supply air temperature and blower speed measured data and zero - equation model simulation and analysis of air distribution and thermal environment inside . Inside front and rear electric heating was used to compare the temperature field, velocity field , as well as staff of the impact of thermal comfort , found that the cabin airflow organizations using electric heating device distribution more uniform , but the differences in thermal comfort in terms of personnel . Therefore , from the viewpoint of saving energy and the angle of the initial investment , the Shanghai subway cars in winter using only air conditioning and heating .

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