CFD Analysis on Inhaled Air Quality with Large Size Supply Opening Personal Air-Conditioning System

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  • CFD解析による大開口吹出のパーソナル空調における呼吸空気質の検討
  • CFD カイセキ ニ ヨル ダイ カイコウ フキダシ ノ パーソナル クウチョウ ニ オケル コキュウ クウキシツ ノ ケントウ

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Abstract

Against the background of the recent trend towards air-conditioning on a personal basis, many studies are being undertaken regarding control of thermal comfort for individual office workers and assurance of the quality of inhaled air. As a result, various personal air-conditiong (PAC) systems have been proposed. This study proposes a PAC system that effectively improves the quality of inhaled air by supplying a large amount of clean air directly to the inhaled air region of the body. A PAC system with large supply openings is newly proposed for this purpose. Assuming a state of steady human inhalation, the effect of different supply opening sizes on inhaled air quality is studied in detail for the same airflow rate on the basis of computational fluid dynamics (CFD). Inhaled air quality is evaluated using passive-scalar analysis, which is applied to ventilation efficiencies in the inhaled air region of the room's occupant and the contribution ratios of gaseous pollutant generated in the room. In the case of PAC with small supply openings (high wind velocity), mixing of the supply air with the surrounding air is enhanced. But, in the case of PAC with large supply openings, mixing of the supply air with the surrounding air is small and ventilation is efficient as shown by the small values of the age and residual lifetime of air compared with the other cases. Also, the influence of pollutants emanating from furniture and wall surfaces in the room on the inhaled air is small. Furthermore, In this study, PAC system is suggested to decrease the risk of inhaling the ETS (Environment Tobacco Smoke) in the condition that smoking person and non-smoking person stay in same time in an office. The characteristics of the indoor environment are examined using CFD simulation, and the inhaled air quality of the person is investigated also. The PAC system is found to be more efficient than the usual all-air system for keeping passive smoker in good air quality in a case of staying with smoker. As results, the large supply opening PAC system removes the mainstream of smoked-air until about 82% and the sub-stream is reduced until about 90%.

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