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Impact of urban albedo on microclimate:Computational investigation in London

SALVATI, AGNESE, Kolokotroni, M., Kotopouleas, Alkis, Watkins, Richard, Giridharan, R., Nikolopoulou, Marialena (2020) Impact of urban albedo on microclimate:Computational investigation in London. In: 35th International Conference on Passive and Low Energy Architecture, Spain. . (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided) (KAR id:91416)

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Official URL
https://doi.org/10.17979/spudc.9788497497947

Abstract

The urban albedo (UA), defined as the ratio of the reflected to the incoming shortwave radiation at

the upper edge of urban canyons, quantifies their ability to reflect solar radiation towards the sky. This research

investigates the impact of real-world urban geometries and optical properties of facades and roads materials on

the UA and street level microclimate in London. The Indexed Sphere (IVS) algorithm of ENVI-met 4.4.4 is used to

compute the UA of several canyon configurations. The accuracy of the IVS algorithm is evaluated against

measurements on a 1:10 physical model reproducing the geometry and materials of the case study area. The

simulation results show that reflective materials applied to the canyon surfaces are more effective in increasing

the UA of canyons with low aspect ratios. The use of reflective materials in urban canyons always increases the

amount of reflections at the street level, increasing the mean radiant temperature in most cases. Air

temperature is not affected by the canyon’s façades reflectivity while it shows a significant daytime reduction for

increased roads’ reflectivity. The results provide preliminary guidelines for the control of UA and the

improvement of microclimate in London

Item Type: Conference or workshop item (Proceeding)
Uncontrolled keywords: Urban Albedo, reflective materials, Heat island, microclimate, ENVImet
Subjects: T Technology
T Technology > TH Building construction
Divisions: Divisions > Division of Arts and Humanities > Kent School of Architecture and Planning
Depositing User: Giridharan Renganathan
Date Deposited: 08 Nov 2021 11:15 UTC
Last Modified: 08 Nov 2021 13:19 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/91416 (The current URI for this page, for reference purposes)
Kotopouleas, Alkis: https://orcid.org/0000-0002-3818-156X
Watkins, Richard: https://orcid.org/0000-0003-3071-9510
Giridharan, R.: https://orcid.org/0000-0002-8627-5616
Nikolopoulou, Marialena: https://orcid.org/0000-0002-0528-2145
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