Numerical Research On The Thermal Environment And Thermal Comfort In The Highway Sleeper Coach

In this paper,the research object is a certain type of highway sleeper coach's indoor airflow field and its passengers.The paper will analyze heat exchange conditions of the indoor airflow field which is under air-condition working condition and evaluate the thermal comfort of passengers who stay in this environment.The computation mainly uses the method of Computational Fluid Dynamics,uses the PNG K-εturbulence model and the DO radiation model,which are provided by the software,so as to simulate the three-dimensional flow field.In the coash's indoor model which is under propriety predigested,the comutation considers the solar radiation and the heat exchange of the passengers.It establishes the three-dimensional turbulence model about the indoor air flow field of the coach.For the indoor airflow numerical simulation results,using post-processing software to visualize.Through this we can get all of the research plats' temperature field,velocity distribution and the concentration distribution of carbon dioxide.Then it will evaluate the distribution of the air flow field by using the flow indexs like Asymmetry Coefficient,ADPI and Energy Coefficient.For the passengers' thermal comfort who are in this typical non-uniform environment such as coach'indoor airflow field,it uses two kinds of thermal comfort index to evaluate,and compares the characteristics of the two indexs.After analysis we can find out that,the distribution about this kind of coach's indoor airflow field is not satisfactory.The reslut of the calculation shows that the Asymmetry coefficient of temperature and velocity is large and the ADPI index result of all of research flats are low,all of the computation reslut are far away from the expectation.The Energy coefficient reslut shows that the outlet's arrangement of the air condition system which its economy still need to be improved;the indoor infectant emission effects is good,but the distribution of concentration is uneven,particularly the concentration of posterior regions is large.The thermal comfort evaluation results show that thermal comfort of each passenger is differ with position's vary,mainly due to the different of solar radiation and outlet arrangement.It shows that the coach'thermal comfort situation needs to be improved.By using the evaluation of EQT and the Thermal Comfort Index find out that these methods in the aspects like theory,focus and the difficulty of calculation and so on each index has its own characteristics.The analysis of this paper is not only for improving the comfort of air-conditioned sleeper coaches,lower energy consumption of air-condition systems,optimizating air-condition system design and air flow field distribution provides gis,but also for probing into the passengers'thermal comfort evaluation who are inside the air-conditioned coaches. All of these can provide ideas and informations for further study.