Comparison of mean radiant temperature from field experiment and modelling: a case study in Freiburg, Germany

Yung Chang Chen, Tzu Ping Lin, Andreas Matzarakis

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

Abstract

Mean radiant temperature (Tmrt) based on two measurement methods and outputs from three models are compared in this study. They are the six direction radiation method, globe thermometer method, RayMan model, ENVI-met model and SOLWEIG model. The comparison shows that globe thermometer method may overestimate the Tmrt since wind velocity is a key variable in the estimation based on this method. For better estimation, Tmrt measured by the globe-thermometer method be corrected by the imported wind speed (stable, low and assuming wind speed) and validated by the six-direction radiation method. The comparison of models shows that the RayMan model’s evaluation of Tmrt involving global radiation with fine time resolution was better than the corresponding evaluations under the other two models (ENVI-met and SOLWEIG) in this case. However, the RayMan model can only assess Tmrt for a one-point one-time context, whereas the other two models can evaluate two-dimensional Tmrt. For two-dimensional evaluations of Tmrt, SOLWEIG have a better prediction of Tmrt than ENVI-met, and ENVI-met can simulate several different variables, which are wind field, particle distribution, CO2 distribution and the other thermal parameters (Ta, surface temperature and radiation fluxes), that SOLWEIG cannot.

Original languageEnglish
Pages (from-to)535-551
Number of pages17
JournalTheoretical and Applied Climatology
Volume118
Issue number3
DOIs
Publication statusPublished - 2014 Jan 1

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

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