The Study Of Air Quality And Passenger Comfort In Micro-environment Of The Air Conditioning Bus

In recent years,in order to build the ecological green city,environment pollution,specially traffic environment pollution has been sustainedly paid attention.Traffic pollution seriously damages to people health,and thus it has become a social hot spot.In order to further reduce traffic pollution,public transportation is strongly advocated.Public transport buses are the main vehicles for commuters,the space inside of it is little,liquidity inside is poor and it has high impermeability.People-oriented is the theme of today’s society,the bus passengers’ health and comfort feeling are becoming the hot spots paid attention from all walks of life.Exposure condition in pollutants and blowing feeling,thermal comfort of bus passengers are the key contents of this study.There are few studies about the particles inside the bus and passenger exposed numerical simulation.In this paper,the study innovatively combined the passenger comfort questionnaire,traffic environment pollutant measurements with numerical simulation of in-car pollutants diffusion and passengers exposed problems.The study contains chemical changes of gas pollution and we created exposure evaluation of short-term average daily ADD value in the CFD software-post.Questionnaire of comfort is used the international general subjective evaluation method which will divide subjective feeling into different psychological widths,and the research results are analyzed by the SPSS software and gray correlation evaluation method.At the same time,the pollutants measurements use the CW-HAT200 air tester to test pollution concentration,temperature,humidity and traffic flow.Questionnaire survey and the measured results show that the pollution of bus inside is influenced by the outside environment,the bus inside is polluted heavily,the bus pollution and passenger comfort are yet to be improved.In order to further detail in-car pollutants diffusion and passenger comfort and exposed problems,capture the steady state and transient state changes,we establish three-dimensional physical,then meshed it,and use the Fluent software to gain the numerical simulation results of the interior flow field,temperature field and particle pollution and gaseous pollutants.The numerical simulation results get a large amount of pollutant concentration distribution and thermal comfort situations,they are consistent with the measured results and subjective feeling more passengers:interior temperature presents certain level gradient,the rear temperature is higher,the rear passengers will feel dis-comfortable,and some passengers have blowing feelings.There are certain rules of pollutant diffusion and passengers exposure levels.In addition,we get the difference of passenger exposure dose of different ages and geometric distribution of the passenger exposure.Subsequently,we changes the geometric structure of passenger compartment,air output and supply angle to optimize the environment of the bus and improve the passenger comfort lever.Results show that changing the supply angle can reduce the concentration of particulate matter pollution and changing the air output and air supply angle can reduce the ozone concentration.After researching,we suggest to create the passenger comfort and ozone pollution exposure feedback mechanism to adjust the parameters of the air conditioning air supply intelligently and suggest to take the ozone exposure dose and comfort parameters as the bus environmental assessment parameters and as the basis of the bus air-conditioning and seat layout design.In advocating to build ecological city,intelligent transportation,people-oriented today,this paper has the significance to optimize the design of instruction inside bus and to guide passengers to take bus healthily and reasonably.