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Urban cooling : Which façade orientation has the most impact on a microclimate?

Taleghani, Mohammad ; Swan, William ; Johansson, Erik LU and Ji, Yingchun (2021) In Sustainable Cities and Society 64.
Abstract

Deploying solar reflective materials on urban surfaces is known as an effective heat mitigation strategy. Several studies have shown their cooling impacts; however, most of them have focused on rooftops rather than facades. The novelty of this paper is related to exploring the impact of each façade orientation on the corresponding microclimate and energy balance. High albedo materials were implemented on facades with different orientations to explore the potential of each façade. Computer simulations were employed to calculate the insolation of different façades, ground surface temperature, and surface energy balances. The simulations are done for the longest day of the year (21st of June) to have the maximum solar radiation on all... (More)

Deploying solar reflective materials on urban surfaces is known as an effective heat mitigation strategy. Several studies have shown their cooling impacts; however, most of them have focused on rooftops rather than facades. The novelty of this paper is related to exploring the impact of each façade orientation on the corresponding microclimate and energy balance. High albedo materials were implemented on facades with different orientations to explore the potential of each façade. Computer simulations were employed to calculate the insolation of different façades, ground surface temperature, and surface energy balances. The simulations are done for the longest day of the year (21st of June) to have the maximum solar radiation on all facades. The results showed that east-west canyons receive 6 h more direct sun than north-south canyons. This proved that eastern and western facades have the most impact on the microclimate. Cooling east and west facades led to the maximum net radiation reductions for the ground surface. Furthermore, north and south facades had negligible contributions to pedestrian thermal comfort. By understanding the role of each façade, designers and policy makers could deploy cooling materials more effectively on building surfaces.

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; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cool walls, Energy balance, Façade orientation, Insolation, Thermal comfort
in
Sustainable Cities and Society
volume
64
article number
102547
publisher
Elsevier
external identifiers
  • scopus:85092666579
ISSN
2210-6707
DOI
10.1016/j.scs.2020.102547
language
English
LU publication?
yes
id
0e392898-53c1-4185-9d15-a235514bc5fc
date added to LUP
2020-11-04 08:42:22
date last changed
2020-11-04 08:42:22
@article{0e392898-53c1-4185-9d15-a235514bc5fc,
  abstract     = {<p>Deploying solar reflective materials on urban surfaces is known as an effective heat mitigation strategy. Several studies have shown their cooling impacts; however, most of them have focused on rooftops rather than facades. The novelty of this paper is related to exploring the impact of each façade orientation on the corresponding microclimate and energy balance. High albedo materials were implemented on facades with different orientations to explore the potential of each façade. Computer simulations were employed to calculate the insolation of different façades, ground surface temperature, and surface energy balances. The simulations are done for the longest day of the year (21st of June) to have the maximum solar radiation on all facades. The results showed that east-west canyons receive 6 h more direct sun than north-south canyons. This proved that eastern and western facades have the most impact on the microclimate. Cooling east and west facades led to the maximum net radiation reductions for the ground surface. Furthermore, north and south facades had negligible contributions to pedestrian thermal comfort. By understanding the role of each façade, designers and policy makers could deploy cooling materials more effectively on building surfaces.</p>},
  author       = {Taleghani, Mohammad and Swan, William and Johansson, Erik and Ji, Yingchun},
  issn         = {2210-6707},
  language     = {eng},
  publisher    = {Elsevier},
  series       = {Sustainable Cities and Society},
  title        = {Urban cooling : Which façade orientation has the most impact on a microclimate?},
  url          = {http://dx.doi.org/10.1016/j.scs.2020.102547},
  doi          = {10.1016/j.scs.2020.102547},
  volume       = {64},
  year         = {2021},
}