According to the estimate of annual fatalities from smoking in Japan, about 130 thousand people died of active smoking and about 15 thousand people died of passive smoking. Smoking now reaches beyond one's liking and is a significant issue which impinges greatly on human lives.
Japanese government enforced Health Promotion Act in 2003 and promoted passive smoking prevention in public spaces. Then, Health, Labor and Welfare Ministry instituted a guideline of passive smoking control in work places and set a standard for smoking room installments. This enhanced separation of smoking areas and quitting smoking in Japan. However, a smoking area has a lot of people in a small space and is faced with the issue of indoor air quality deterioration.
In the beginning, this study examined the previously installed smoking room with sufficient ventilation volume. The result shows that the value of indoor dust concentration is over the standard value of 0.15 mg/m
3 to a considerable extent. In the next, based on this result, this study examined the indoor air improvement possibility of introducing the highly efficient ventilation toward the smoking room. The accuracy of indoor dust concentration distribution reproduce in CFD was examined. Then, this study conducted some case studies through the CFD simulations of smoking acts and smokers' stays and the actual size experiments, and considered the indoor air improvement of a highly efficient ventilation system. The ventilation system considered in this study were the following three types: the ceiling supply system with existing diffuser, newly developed vertical swirl flow system and horizontal swirl flow system.
In the result, the air charge efficiency of the horizontal swirl flow system was the greatest under the condition without a heat generator simulating a human body. However, the efficiency dropped under the condition with a heat generator, and the efficiencies of horizontal swirl flow system and the ceiling supply system were about the same when the amount of heat generation was the same as in the actual smoking space. The efficiency of the vertical swirl flow system was the greatest under the condition with a heat generator. The comparison of contaminant removal effectiveness, which expresses the dust elimination ability, shows that the values of horizontal swirl flow system and ceiling supply system are generally the same as each other, and that the value of vertical swirl flow system is about 2.5 times as big as that of the ceiling supply system.
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