Performance Evaluation of Different Air Distributions in a Sleeping Space of a Vehicle

摘要

Air distribution of a sleeping space in a long journey is important for sleep quality.In order to design sleeping space that is more comfortable and with fresher air,this investigation used CFD to obtain the distributions of the air velocity,air temperature,CO2 concentration in the sleeping space and analyzed three air supply methods: displacement ventilation,personal ventilation,and mixing ventilation.This study used facial area speed ratio with different air velocity range (FSR),mean age of air (MA),and draft risk (DR) to evaluate the air distribution effectiveness.The results showed that the performance of the personal ventilation system was better than that of the displacement and mixing ventilation systems because it gave better thermal comfort,higher air quality,and lower energy consumption.