کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6698124 1428362 2018 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Comparing the cooling effects of a tree and a concrete shelter using PET and UTCI
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
پیش نمایش صفحه اول مقاله
Comparing the cooling effects of a tree and a concrete shelter using PET and UTCI
چکیده انگلیسی
Trees could provide notable cooling by intercepting solar radiation and evapotranspiration. Human-made shelters in urban areas also serve as shading devices. However, few studies have compared the cooling efficacy of trees and artificial shelters. This study systematically quantified and compared the daytime and nighttime cooling effects of a large Chinese Banyan tree (Ficus microcarpa) with dense foliage and an extensive concrete shelter, in an urban park in Hong Kong's subtropical summer. Microclimatic parameters at the two sites were monitored to compare air temperature, and the computed values of PET (Physiological Equivalent Temperature) and UTCI (Universal Thermal Climate Index). The mean daytime cooling effects generated by the tree were 0.6 °C (air temperature), 3.9 °C (PET) and 2.5 °C (UTCI), which were higher than the shelter at 0.2 °C, 3.8 °C and 2.0 °C respectively. The differences were significant for air temperature and UTCI (p < .001 and p < .05 respectively, t-test) but not for PET (p = .261). The tree's mean daytime maximum cooling effects were 2.1 °C (air temperature), 18.8 °C (PET) and 10.3 °C (UTCI). The tree's mean nighttime cooling was significantly higher than the shelter for all three indices (p < .001, t-test). The thermal stress classifications by PET and UTCI were significantly different on the neutral or warmer side (p < .001, Chi-squared test), suggesting that they cannot be used interchangeably. The findings could inform decisions on natural versus artificial shelters in urban thermal design, and trigger comparative investigations in using PET and UTCI for outdoor thermal comfort assessment.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Building and Environment - Volume 130, 15 February 2018, Pages 49-61
نویسندگان
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