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Your search keyword '"Wu, Yongjia"' showing total 239 results
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239 results on '"Wu, Yongjia"'

35. Numerical Analysis of the Effects of Different Window-Opening Strategies on the Indoor Pollutant Dispersion in Street-Facing Buildings.

Author

Wu, Yongjia, Ouyang, Yilian, Shi, Tianhao, Li, Zhiyong, and Ming, Tingzhen

Subjects
*COMPUTATIONAL fluid dynamics, *NUMERICAL analysis, *POLLUTANTS, *STREETS, *WIND speed, *ROAD interchanges & intersections, *VEHICLE routing problem
Abstract

The idling of automobiles at street intersections can lead to pollutant accumulation which impacts the health of residents in street-facing buildings. Previous research focused on pollutant dispersion within street canyons and did not consider the coupling of indoor and outdoor pollutants. This paper employs the computational fluid dynamics (CFD) method to simulate the dispersion characteristics of vehicle emission pollutants in street canyons, primarily investigating the indoor and outdoor pollutant dispersion patterns under various window opening configurations (single-sided ventilation, corner ventilation, and different positions of the glass under corner ventilation). Additionally, the study considers the impacts of the aspect ratio and ambient wind speed. Studies have shown that corner ventilation is effective in reducing indoor pollutant levels. When the two window glass positions are far away from the center of the intersection, the average CO mass fraction in the single-sided ventilation room is reduced by 87.1%. The average indoor CO mass fraction on the leeward side decreases with the increasing wind speed and aspect ratio. At a wind speed of 8 m/s, the average indoor CO mass fraction on the leeward side decreases to 2.45 × 10−8. At an aspect ratio of 2, the indoor CO mass fraction on the leeward side decreases with increasing floors before stabilizing at approximately 4.77 × 10−9. This study suggests optimal window opening strategies to reduce indoor pollutant levels in street-facing buildings at street intersections, offering guidance to indoor residents on window ventilation practices. [ABSTRACT FROM AUTHOR]

Published
2024
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36. Octadecyl acrylate-based self-supporting elastic phase change framework materials for the enhancement of photovoltaic conversion efficiency.

Author

Qian, Yongqiang, Tan, Lei, He, Wentao, Liao, Liling, Wu, Yongjia, Chen, Yiyang, Li, Dan, Zhang, Xu, Wang, Guxia, Wei, Yen, and Guo, Shengwei

Subjects
PHASE change materials, CROSSLINKING (Polymerization), ACRYLIC acid, PHASE transitions, LATENT heat, SOLVENT extraction
Abstract

Incorporating support structures into solid–liquid phase change materials (SLPCMs) addresses fluid dynamics challenges during phase transitions, albeit at the cost of reduced phase change enthalpy. We propose a novel approach for developing self-sustaining, porous phase change materials. This process begins with the fabrication of self-sustaining poly(acrylic acid) octadecyl ester aerogels through cross-linking polymerization and thermally induced phase separation (TIPS) followed by ambient drying to shape the aerogel. This aerogel demonstrates exceptional energy storage capacity, impressive room-temperature elasticity, and significant load-bearing strength. Leveraging this aerogel as a scaffold, we employ a 'one-step' technique to produce phase change gels (PCGs). This method, in which EI functions both as a solvent and as SLPCMs, yields PCGs with a high latent heat capacity of 192 J g−1, outstanding phase change elasticity, and structural stability, proving highly effective in photoelectric thermal management. Notably, the 'one-step' process for fabricating self-supporting PCGs circumvents conventional steps like solvent extraction and phase change material absorption in traditional porous foam production. This simplification streamlines manufacturing and facilitates the large-scale production of phase change materials that are morphologically stable, possess high latent heat, and exhibit superior mechanical properties. [ABSTRACT FROM AUTHOR]

Published
2024
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