Impact of shortwave multiple reflections in an urban street canyon on building thermal energy demands

Vallati, Andrea; Mauri, Luca; Colucci, Chiara

doi:10.1016/j.enbuild.2018.06.037

Cited by 25 publications

(10 citation statements)

References 24 publications

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“…All the above-mentioned phenomena influence the prediction of buildings energy performance [10][11][12][13][14][15][16][17] and may be one of the causes explaining the gap between targeted and measured buildings performances [18][19][20][21]. Therefore, it is relevant to explore methods that account for the local microclimate and the effect of neighboring buildings when conducting energy simulations.…”

Section: Contextmentioning

confidence: 99%

See 1 more Smart Citation

How building energy models take the local climate into account in an urban context – A review

Lauzet

Rodler

Musy

et al. 2019

Renewable and Sustainable Energy Reviews

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Section: Contextmentioning

confidence: 99%

“…Introducing some patches or modifying some equations in the BEM is the strategy chosen by Vallati et al [15] who model a street canyon in TRNSYS as an internal zone with an open air ceiling that is an atrium. Djedjig et al [118] also develop a new module in TRNSYS so as to include the canyon street confinement effect.…”

Section: Other Strategiesmentioning

confidence: 99%

How building energy models take the local climate into account in an urban context – A review

Lauzet

Rodler

Musy

et al. 2019

Renewable and Sustainable Energy Reviews

View full text Add to dashboard Cite

“…BES longwave radiative exchanges between buildings are either pre-calculated using an urban climate model (e.g., TEB (Bueno et al, 2011), ENVI-met (Yang et al, 2012) and CitySim (Miller et al, 2018)), or indoor radiation schemes have been applied to surrounding external facets (so-called "false zone", e.g. Vallati et al (2018) and Allegrini et al (2016) in TRNSYS). Both approaches have been restricted to simple geometries (e.g.…”

Section: Introductionmentioning

confidence: 99%

Impact of inter-building longwave radiative exchanges on building energy performance and indoor overheating

Xie

Luo

Grimmond

et al. 2022

Building and Environment

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“…The aforementioned work took reflection and urban albedo as important parameters when testing different scenarios. There are also studies investigating the influence of shortwave reflections on the energy balance (Vallati et al, 2018;Ali-Toudert, 2021). As an approach that can support detailed urban geometry model, the solar and longwave environmental irradiance geometry (SOLWEIG) model can simulate spatial variations of three-dimensional radiation fluxes in complex urban settings with building digital elevation model as input (Lindberg et al, 2008;Lindberg and Grimmond, 2011) and has been tested in cases of different cities.…”

Section: Introductionmentioning

confidence: 99%

Resolving Radiant: Combining Spatially Resolved Longwave and Shortwave Measurements to Improve the Understanding of Radiant Heat Flux Reflections and Heterogeneity

Merchant¹,

Meggers²,

Hou³

et al. 2022

Front. Sustain. Cities

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We introduce and demonstrate new measurement and modeling techniques to fully resolve the spatial variation in shortwave and longwave radiant heat transfer in the outdoor environment. We demonstrate for the first time a way to directly resolve the shortwave radiant heat transfer from terrestrial reflected and diffuse sky components along with the standard direct solar radiation using an adapted thermopile array and ray-tracing modeling techniques validated by 6-direction net radiometer. Radiant heat transfer is a major component of heat experienced in cities. It has significant spatial variability that is most easily noticed as one moves between shade and direct solar exposure. But even on a cloudy and warm day the invisible longwave infrared thermal radiation from warm surfaces makes up a larger fraction of heat experienced than that caused by convection with surrounding air. Under warm or hot climate conditions in cities, radiant heat transfer generally accounts for the majority of heat transfer to people. Both the shortwave (visible/solar) and the longwave (infrared/thermal) have significant spatial variation. We demonstrate sensor methods and data analysis techniques to resolve how these radiant fluxes can change the heat experienced by >1 kWm−2 across small distances. The intense solar shortwave radiation is easily recognized outdoors, but longwave is often considered negligible. Longwave radiation from heat stored in urban surfaces is more insidious as it can cause changes invisible to the eye. We show how it changes heat experienced by >200 Wm−2. These variations are very common and also occur at the scale of a few meters.

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Impact of shortwave multiple reflections in an urban street canyon on building thermal energy demands

Cited by 25 publications

References 24 publications

How building energy models take the local climate into account in an urban context – A review

How building energy models take the local climate into account in an urban context – A review

Impact of inter-building longwave radiative exchanges on building energy performance and indoor overheating

Resolving Radiant: Combining Spatially Resolved Longwave and Shortwave Measurements to Improve the Understanding of Radiant Heat Flux Reflections and Heterogeneity

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