CityComfort+: A simulation-based method for predicting mean radiant temperature in dense urban areas

This paper introduces CityComfort+, a new method to simulate the spatial variation of the mean radiant temperature (Tmrt) in dense urban areas. This method derives the Tmrt by modeling five components of radiation fluxes—direct solar radiation, diffuse solar radiation, reflected solar radiation, lon...

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Vydáno v:Building and environment Ročník 80; s. 84 - 95
Hlavní autoři: Huang, Jianxiang, Cedeño-Laurent, Jose Guillermo, Spengler, John D.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Kidlington Elsevier Ltd 01.10.2014
Elsevier
Témata:
Algorithms
Applied sciences
Building insulation
Buildings
Buildings. Public works
Computation methods. Tables. Charts
Computer simulation
Construction
Exact sciences and technology
External envelopes
Mathematical models
Mean radiant temperature
Outdoor thermal comfort
Radiance
Ray-tracing technique
Simulation
Solar radiation
Structural analysis. Stresses
Surface temperature
Thermal comfort
Urban areas
Urban development
United States
North America
Massachusetts
America
USA, Massachusetts, Boston
Mean radiant temperature
Outdoor thermal comfort
Simulation
Ray-tracing technique
Tracer technique
Thermal comfort
In situ test
Measurement result
Surface temperature
Urban area
Forecast model
Modeling
Outdoor study
Town
Ray tracing
Numerical simulation
Solar radiation
ISSN:0360-1323, 1873-684X
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Shrnutí:This paper introduces CityComfort+, a new method to simulate the spatial variation of the mean radiant temperature (Tmrt) in dense urban areas. This method derives the Tmrt by modeling five components of radiation fluxes—direct solar radiation, diffuse solar radiation, reflected solar radiation, long-wave radiation from the atmosphere, and long-wave radiation from urban surfaces—each weighted by view factors. The novelty of CityComfort+ lies in a new algorithm to model surface temperature and associated long-wave radiation as well as the application of RADIANCE, a ray-tracing algorithm that can accurately simulate 3-D radiation fluxes in a complex urban space (Ward, et al, 1998). CityComfort+ was evaluated in field studies conducted in a dense urban courtyard (mean sky view factor of 0.4) in Boston, Massachusetts, USA under winter, spring, and summer (cold, warm, and hot) weather conditions. Simulation results yielded close agreement with measured Tmrt. Also, predicted mean surface temperature agreed well with the measurement data. A sensitivity test using CityComfort+ revealed that Tmrt on the study site will be mostly affected by the heat capacity and emissivity of surface material, not albedo. This study is subject to limitations from sensor accuracy and the thermal inertia of the grey ball thermometer, and the CityComfort+ method is still under development. The next step is to compare its performance with existing methods. •A new method, CityComfort+, to simulate the mean radiant temp (Tmrt) is proposed.•It accounts for all radiation components and applies ray-tracing algorithms.•Results yield close agreements with measured Tmrt in Boston, MA, USA.•On-site Tmrt respond to heat capacity & emissivity of surface material, not albedo.•CityComfort+ can be a design tool to improve thermal comfort in open spaces.
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ISSN:0360-1323
1873-684X
DOI:10.1016/j.buildenv.2014.05.019