Cooling and energy saving potentials of shade trees and urban lawns in a desert city

Zhihua Wang, Xiaoxi Zhao, Jiachuan Yang, Jiyun Song

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

The use of urban vegetation in cities is a common landscape planning strategy to alleviate the heat island effect as well as to enhance building energy efficiency. The presence of trees in street canyons can effectively reduce environmental temperature via radiative shading. However, resolving shade trees in urban land surface models presents a major challenge in numerical models, especially in predicting the radiative heat exchange in canyons. In this paper, we develop a new numerical framework by incorporating shade trees into an advanced single-layer urban canopy model. This novel numerical framework is applied to Phoenix metropolitan area to investigate the cooling effect of different urban vegetation types and their potentials in saving building energy. It is found that the cooling effect by shading from trees is more significant than that by evapotranspiration from lawns, leading to a considerable saving of cooling load. In addition, analysis of human thermal comfort shows that urban vegetation plays a crucial role in creating a comfortable living environment, especially for cities located in arid or semi-arid region.

Original languageEnglish (US)
Pages (from-to)437-444
Number of pages8
JournalApplied Energy
Volume161
DOIs
StatePublished - Jan 1 2016

Fingerprint

Energy conservation
desert
Cooling
cooling
shading
Arid regions
Evapotranspiration
Thermal comfort
street canyon
Thermal effects
landscape planning
Energy efficiency
Numerical models
vegetation
heat island
semiarid region
energy efficiency
vegetation type
metropolitan area
canyon

Keywords

  • Building energy efficiency
  • Human thermal comfort
  • Hydrological processes
  • Monte Carlo simulation
  • Radiative heat exchange
  • Urban vegetation

ASJC Scopus subject areas

  • Energy(all)
  • Civil and Structural Engineering

Cite this

Cooling and energy saving potentials of shade trees and urban lawns in a desert city. / Wang, Zhihua; Zhao, Xiaoxi; Yang, Jiachuan; Song, Jiyun.

In: Applied Energy, Vol. 161, 01.01.2016, p. 437-444.

Research output: Contribution to journalArticle

Wang, Zhihua ; Zhao, Xiaoxi ; Yang, Jiachuan ; Song, Jiyun. / Cooling and energy saving potentials of shade trees and urban lawns in a desert city. In: Applied Energy. 2016 ; Vol. 161. pp. 437-444.
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