Air-conditioned Buses In The Hot And Humid Areas And Improve Air Quality Survey Research

With the acceleration of urbanization process, the use of hot-humid area air conditioning bus has become quite common, and the study of air conditioning bus indoor air quality problem has become a hot spot.This article selects Guangzhou as the representative of the typical hot and humid regions as the research object in air conditioning bus, on the basis of predecessors’ research, this paper mainly studies the number of passengers, vehicle interior air temperature, air relative humidity, concentration of carbon dioxide, test results show that within the rush-hour, there are55-75people in cabin, it is overloaded, during this time the car indoor air relative humidity may be higher than outdoor air relative humidity, CO2concentration is as high as2000ppm, beyond the human body to accept limit that is1500ppm. In passenger flow slack period, the number of passengers under40people, bus indoor air relative humidity is generally lower than outdoor, CO2concentration between200-400ppm. The temperature of bus cabin usually keep in27℃, satisfies the requirement of human body thermal comfort.In this paper, using the general international air quality subjective questionnaire surveyed the subjective feeling of passengers, passengers mainly to car indoor air odor and air relative humidity showed discontent. Through the indoor air quality of bus of subjective and objective investigation, can come to the conclusion that car indoor ventilation and air conditioning system can satisfy the passenger flow in the slack time regulation of indoor air environment and can’t effectively meet the current peak passenger flow period under the regulation of the cabin air environment. Improve the air quality there are many methods, this paper from the aspects of airflow organization, by improving the inside cabin airflow organization form in order to achieve the purpose of the car to improve indoor air quality.Based on car indoor air quality data of objective test based on the results of the survey, typical air conditioning bus car chamber physical model is established, and the car chamber made to simplify, introduced the human physical model and physical model, according to the passenger behavior characteristics, the anterior and posterior position respectively in the indoor layout of the human body model, based on the common airflow organization form, this article selects four kinds of different way of air distribution, key to select five different location of the passenger car interior, using numerical simulation method analyzes the indoor air conditioning bus four different air distribution mode, exhaled by human to rule out the effectiveness of the gas, the results show that under different airflow organization forms, eliminate body expiratory difference is bigger, and found next to the back of displacement ventilation mode ventilation effect is best, the most easily exhaled by human to rule out the air, at the same time, under this way of air distribution, indoor air velocity uniformity and exclude each position to the difficulty of the passengers out quite, under this kind of ventilation method can effectively reduce the passenger crossover probability of infection, can improve the peak passenger flow ventilation air conditioning system of the car indoor air environment regulation, in order to satisfy the requirement to human body health.