Please use this identifier to cite or link to this item:
http://hdl.handle.net/10397/92763
DC Field | Value | Language |
---|---|---|
dc.contributor | Department of Mechanical Engineering | en_US |
dc.contributor | Department of Aeronautical and Aviation Engineering | en_US |
dc.creator | Li, Z | en_US |
dc.creator | Zhang, H | en_US |
dc.creator | Wen, CY | en_US |
dc.creator | Yang, AS | en_US |
dc.creator | Juan, YH | en_US |
dc.date.accessioned | 2022-05-16T09:07:37Z | - |
dc.date.available | 2022-05-16T09:07:37Z | - |
dc.identifier.issn | 0360-1323 | en_US |
dc.identifier.uri | http://hdl.handle.net/10397/92763 | - |
dc.language.iso | en | en_US |
dc.publisher | Pergamon Press | en_US |
dc.rights | © 2020 Elsevier Ltd. All rights reserved. | en_US |
dc.rights | ©2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/ | en_US |
dc.rights | The following publication Li, Z., Zhang, H., Wen, C. Y., Yang, A. S., & Juan, Y. H. (2020). Effects of height-asymmetric street canyon configurations on outdoor air temperature and air quality. Building and Environment, 183, 107195 is available at https://doi.org/10.1016/j.buildenv.2020.107195. | en_US |
dc.subject | Air quality | en_US |
dc.subject | Asymmetric street canyon | en_US |
dc.subject | Computational fluid dynamics | en_US |
dc.subject | Outdoor thermal comfort | en_US |
dc.subject | Realistic solar radiation | en_US |
dc.title | Effects of height-asymmetric street canyon configurations on outdoor air temperature and air quality | en_US |
dc.type | Journal/Magazine Article | en_US |
dc.identifier.volume | 183 | en_US |
dc.identifier.doi | 10.1016/j.buildenv.2020.107195 | en_US |
dcterms.abstract | This paper investigates the effects of height-asymmetric street canyon configurations on air temperature and air quality at the pedestrian level using the ANSYS Fluent® software. The study concerns the situation with a subtropical city where there is a predominant wind direction (as is the case in, e.g., Hong Kong) and where the direction of that wind is perpendicular to the street canyon, since this is the worst-case from air pollution and overheating point of view. In particular, this North-South oriented street has been studied with the realistic solar irradiance at two different sun directions, corresponding to morning (08:00) and afternoon (16:00) hours, respectively. Two step-up and two step-down North-South oriented street canyons are considered under two different incoming wind speeds (high and low). The corresponding ratios of upwind and downwind building heights are = 1/3, 2/3 and 3/1, 3/2, respectively. | en_US |
dcterms.abstract | The results demonstrated that for the step-up canyon, a higher upwind building was found to produce a hotter air temperature only at a low wind speed and polluted more severely at both high and low wind speeds, compared with its lower upwind building counterpart. In contrast, for the step-down canyon, a higher downwind building was found to produce cooler air temperatures at both high and low wind speeds and accumulated more pollutants only at a low wind speed, compared with its lower downwind building counterpart. On the other hand, at the high wind speed, both air quality and thermal environment were better in the step-up canyon than in the step-down canyon. However, at the low wind speed, the air quality was higher in the step-down canyon than the step-up canyon, while the step-up canyon still provided better thermal environment than the step-down canyon. Moreover, a Richardson number (Ri) for the asymmetric street canyons is defined for the evaluation of the buoyancy force versus the inertial force. When |Ri| > 20, the flow field was mainly dominated by natural convection, and an increase of |Ri| resulted in an increase in the air temperature and a decrease in the pollutant concentration. In contrast, when |Ri| < 20, the flow field was dominated by forced convection, and the variation of |Ri| had an insignificant influence on air quality and air temperature. The simulated pollutant concentration and thermal environment results were further processed to obtain optimization guidelines for a north-south asymmetric canyon in the city centers of Hong Kong via the application of multivariate regression analysis with a group of dimensionless parameters. These guidelines will facilitate the renewal of north-south asymmetric street canyons while enhancing air quality and lowering air temperature by serving as a reference for architects. | en_US |
dcterms.accessRights | open access | en_US |
dcterms.bibliographicCitation | Building and environment, Oct. 2020, v. 183, 107195 | en_US |
dcterms.isPartOf | Building and environment | en_US |
dcterms.issued | 2020-10 | - |
dc.identifier.scopus | 2-s2.0-85089952275 | - |
dc.identifier.eissn | 1873-684X | en_US |
dc.identifier.artn | 107195 | en_US |
dc.description.validate | 202205 bckw | en_US |
dc.description.oa | Accepted Manuscript | en_US |
dc.identifier.FolderNumber | AAE-0075 | - |
dc.description.fundingSource | Others | en_US |
dc.description.fundingText | Research Institute of Sustainable Urban Development (RISUD), The Hong Kong Polytechnic University | en_US |
dc.description.pubStatus | Published | en_US |
dc.identifier.OPUS | 43059799 | - |
Appears in Collections: | Journal/Magazine Article |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Li_Effects_Height-Asymmetric_Street.pdf | Pre-Published versions | 3.94 MB | Adobe PDF | View/Open |
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