Estimation of mean radiant temperature across diverse outdoor spaces: A comparative study of different modeling approaches

Siqi Jia, Yuhong Wang, Nyuk Hien Wong, Chun Liang Tan, Shisheng Chen, Qihao Weng, Cheuk Ming Mak

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

The mean radiant temperature (Tmrt) is an important environmental parameter that affects the thermal comfort of human beings. However, both the measurement and estimation of Tmrt have some inherent challenges. This study evaluated the performance of five methods in estimating Tmrt, using data at 670 locations across 14 representative urban forms in Hong Kong. The evaluated methods include the customized globe thermometer method, recalibrated globe thermometer method, SOLWEIG simulation method, regression model, and neural network model. Values calculated from the integral radiation method were used as references for comparison. Results indicate that the customized and recalibrated globe thermometer methods and the SOLWEIG model consistently underestimate Tmrt throughout most of the day, with substantial errors observed at low sun elevations and sunlit sites. The regression model provides a moderate fit to the data. The deep neural network (DNN) model yields the highest estimation accuracy, with an R2 of 0.878 and a root mean square error (RMSE) of 1.92 °C. To assess the generalizability of the DNN model, an additional dataset from Singapore is employed, including hourly meteorological data from 28 measurement stations over a two-year period. The DNN model demonstrates strong consistency between modeled Tmrt and the reference across most of the sites, affirming its effectiveness in estimating Tmrt in complex urban environments.

Original languageEnglish
Article number114068
JournalEnergy and Buildings
Volume310
DOIs
Publication statusPublished - 1 May 2024

Keywords

  • Deep neural network
  • Integral radiation measurement
  • Mean radiant temperature
  • Outdoor thermal comfort
  • Urban heat island

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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