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field synergy analysis of pollutant dispersion in street canyons and its optimization by adding wind catchers

Building Simulation 2021年第2期14卷 391-405页

作者： Tingzhen Ming Huina Han Zhen Zhao Renaud de Richter Yongjia Wu Wei Li Nyuk Hien Wong School of Civil Engineering and Architecture Wuhan University of TechnologyNo.122 Luoshi RoadHongshan DistrictWuhan430070China School of Architectural Engineering Huanggang Normal UniversityNo.146 Xingang Second RoadHuanggang438000China School of design and environment National University of Singapore4 Architecture Drive117566SingaporeSingapore Tour-Solaire.Fr 8 Impasse des PapillonsF34090MontpellierFrance School of Engineering&Applied Science Aston UniversityBirminghamB47ETUK

The microenvironment,which involves pollutant dispersion of the urban street canyon,is critical to the health of pedestrians and *** objectives of this work are twofold:(i)to effectively assess the pollutant dispersion process based on a theory and(ii)to adopt an appropriate stratigy,i.e.,wind catcher,to alleviate the pollution in the street *** dispersion in street canyons is essentially a convective mass transfer *** the convective heat transfer process and the mass transfer process are physically similar and the applicability of field synergy theory to turbulence has been verified in the literature,we apply the field synergy theory to the study of pollutant dispersion in street *** this paper,a computational fluid dynamics(CFD)simulation is conducted to investigate the effects of wind catcher,wind speed and the geometry of the street canyons on pollutant *** to the field synergy theory,Sherwood number and field synergy number are used to quantitatively evaluate the wind catcher and wind speed on the diffusion of pollutants in asymmetric street *** results show that adding wind catchers can significantly improve the air quality of the step-down street canyon and reduce the average pollutant concentrations in the street canyon by 75%.Higher wind speed enhances diffusion of pollutants differently in different geometric street canyons.

关键词： street canyon field synergy theory CFD simulation pollutant dispersion wind catcher

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A novel porous channel to optimize the cooling performance of PV modules

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Energy and Built Environment 2022年第2期3卷 210-225页

作者： Yingbo Zhang Chao Shen Chunxiao Zhang Jihong Pu Qianru Yang Cheng Sun School of Architecture Harbin Institute of TechnologyKey Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and TechnologyMinistry of Industry and Information TechnologyHarbin 150090China

This paper dealt with a series of numerical investigations on a new porous cooling channel applied to PV/T systems in order to improve the insufficient heat transfer in the conventional *** proposed porous cooling channel based on field synergy theory had a higher overall heat transfer coefficient,which enhanced the total efficiency of the PV/T *** numerical model was validated with experimental *** results showed that holes distributed non-uniformly near the outlet of the cooling water led to a better cooling effect,and a hole diameter of 0.005 m led to an optimal *** total efficiency of the PV module with the new cooling channel was 4.17%higher than the conventional one at a solar irradiance of 1000 W/m^(2)and an inlet mass flow rate of 0.006 kg/*** addition,as the solar irradiance increased from 300 to 1200 W/m^(2),the total efficiency of the new PV/T system dropped by 5.07%,which included reductions in both the electrical and thermal *** total efficiency was improved by 18.04%as the inlet mass flow rate of cooling water increased from 0.002 to 0.02 kg/s.

关键词： PV modules Heat regulation field synergy theory PV cell temperature

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