Simulation And Evalution Of Indoor Natural Ventilation

The indoor environment is the important place that the mankind exist with activity.The city residents spend 90% everyday time in various indoor environment, indoor environment quality and human body health are vitally related. As a result ,indoor air quality's influence to human body health is more and more subjected to the value and the concern between domestic and international scholar and researcher.The dormitory is one of the main places that the student's ctivity takes a rest.At our country, the ventilation of the dormitory is basic to regard natural ventilation as principle.So under this kind of well ventilated way, how indoor air quality is, and how the indoor air influence to the health of student?This is the target this topic pay attention to.We will make use of the evaluation method that subjective evaluation and objective evaluation combine together to evaluate indoor air quality completely and reasonably.For the sake of indoor objective evaluation of the air quality of realization to dormitory, we adopted exclusively Airpak software facing to the HVAC realm to carry on imitating and analysis to the well ventilated condition of dormitory.First, according to characteristic and internal structure condition of nature ventilation inside the dormitory, we built up indoor natural well ventilated model, and choose to use k-εtwo square distance turbulent flow models to carry on emulation to solve.Then, we carried on a subjective questionnaire to the indoor air quality.According to the questionnaire result, we selected 200 dormitories as research objects in 14 buildings.To test the indoor temperature, relative humidity and carbon dioxide density in the dormitory, we adopte an indoor air quality test instrument(the IAQM PS31) to carry on an experiment diagraph.In the end, the measured data carried on experiment was uesd to verify to the temperature field, speed field and the carbon dioxide density field that the emulation comes out.By improving the model and verifying again and again, we make the result of model imitating and test measuring have good consistency, and both fit together degree very high.This model can be used to analyze and evaluate indoor air quality.We make use of natural well ventilated model which has already been verified dialogue day and night two kinds of typical model conditions to carry on an objective evaluation. Analyzing the estimate of indoor air dissatisfied percentage(PPD), speed field and the carbon dioxide density field, we think indoor ir quality of the dormitory in summer basicly satisfy a comfort request, but existence influence a healthy factor.In the meantime, we pass the subjective evaluation result that the questionnaire is to also explain, the indoor personnel exists unwell symptom and healthy problem with different degree.This needs us to maintain good ventilation, usually sweeping hygiene to keep healthy.