In a large enolosure containing contaminant sources such as an underground car park, it is important to supply fresh air f( )r the°G cupied ... e ・nd I。 ・em ・ v ・ p ・ 11 ・ t・ d ・i ・ effi・i ・ntly ・ F・。m Ih ・ vi ・wp ・ i・ t ・f h・m 皿 h・alth , th... f... , th ・ 1・ y・・t・ 、nd th, ventilation 「ate of supPly openings as well as exhaust openings should be designed properly to keep air quality favorable fbr healIh , In th・ p ・。 ・ i... p ・ p ・ rs ・ th ・ ・ xp ・ ・im ・ nt ・1 ・t・dy 。・ the ag ・ ・ f ・ i・ i・ an

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... d ・・g... nd ・a ・ p ・・ k・ with ・ th ・ Qn ・ − w ・y ・・nUl 、ti 。n system was presentcd , The detail of fresh air distribution was studied with the CFD simulation conduGted in lhe same conditions as the experiment did, in addition , the in 伽 ence of supply ! exhaust air imbalance of mechanical ventilation system , and the buoyancy effect of heat from ground and vehicles were studied with th ¢ age ofairobIained f ヒ om CFD , In this pape ら the distribution of polluted gas generated from vehicles is simulated . Two IDcations of pollutant source , i . e. a parking spaGe and a drivingpath. are supposed , and the ventilation eMciency i3 examined by CFD . In addition . in order to improve the ven 田 ation cfficiency , high velocity fan diffuser − units are supposed to be installed in重 he stagnant region and { nvestigated with CFD simvlation .