지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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In this study, the effects of building-roof cooling on scalar dispersion in threedimensional street canyons are investigated using a computational fluid dynamics (CFD) model. For this, surface temperature of building roof is systematically changed and non-reactive ollutants are released from street bottom in urban street canyons with the aspect ratio of 1. The characteristics of flow, air temperature, and non-reactive pollutant dispersion in the control experiment are analyzed first. Then, the effects of building-roof cooling are investigated by comparing the results with those in the control experiment. In the control experiment, a portal vortex which is a secondary flow induced by ambient air flow is formed in each street canyon. Averaged air temperature is higher inside the street canyon than in both sides of the street canyon, because warmer air is coming into the street canyon from the roof level. However, air temperature near the street bottom is lower inside the street canyon due to the inflow of cooler air from both sides of the street canyon. As building-roof temperature decreases, wind speed at the roof level increases and portal vortex becomes intensified (that is, downdraft, reverse flow, and updraft becomes stronger). Building-roof cooling contributes to the reduction of average concentration of the non-reactive pollutants and average air temperature in the street canyon. The results imply that building-roof cooling has positive effects on improvement of thermal environment and air quality in urban areas.
목차
Abstract
1. 서론
2. 연구방법
3. 결과 및 고찰
4. 요약 및 결론
REFERENCES
참고문헌 (39)
참고문헌 신청
1. [학술지(정기간행물)] - Alexandria, E. / 2008 / Temperature decreases Fig. 13. Variation of air temperature and non-dimensional concentration averaged over the street canyon with buildingroof cooling. in an urban canyon due to green walls and green roofs in diverse climates / Build. Environ. 43 : 480 ~ 493
2. [학술지(정기간행물)] - Asaeda, T. / 1996 / Heat storage of pavement and its effect on the lower atmosphere / Atmos. Environ. 30 : 413 ~ 427
3. [학술지(정기간행물)] - Baik, J. J. / 2002 / On the escape of pollutants from urban street canyons / Atmos. Environ. 36 : 527 ~ 536
4. [학술지(정기간행물)] - Baik, J. J. / 2009 / Urban flow and dispersion simulation using a CFD model coupled to a mesoscale model / J. Appl. Meteor. Climatol. 48 : 1667 ~ 1681
5. [학술지(정기간행물)] - Baik, J. J. / 2012 / Effects of building roof greening on air quality in street canyons / Atmos. Environ. 61 : 48 ~ 55
2. [학술지(정기간행물)] - Asaeda, T. / 1996 / Heat storage of pavement and its effect on the lower atmosphere / Atmos. Environ. 30 : 413 ~ 427
3. [학술지(정기간행물)] - Baik, J. J. / 2002 / On the escape of pollutants from urban street canyons / Atmos. Environ. 36 : 527 ~ 536
4. [학술지(정기간행물)] - Baik, J. J. / 2009 / Urban flow and dispersion simulation using a CFD model coupled to a mesoscale model / J. Appl. Meteor. Climatol. 48 : 1667 ~ 1681
5. [학술지(정기간행물)] - Baik, J. J. / 2012 / Effects of building roof greening on air quality in street canyons / Atmos. Environ. 61 : 48 ~ 55
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UCI(KEPA) : I410-ECN-0101-2015-450-002731534