Energy exchanges between buildings is affected by urban fabric. As a matter of fact, heat exchange between adjacent buildings is due to convective and radiative heat flows. The main parameters which influence these heat exchange mechanisms are due to climate conditions such as air temperatures/humidity, wind speed/direction and solar irradiance. Most building energy simulations are done on an independent single building with typical meteorological year (TMY). These TMY meteorological data cannot represent the state of the urban microclimate and rather ignores the microclimate influence on buildings adjacent to street canyons. However, solar radiation shading and reflection of the environment within the street canyons are important factors affecting the energy consumption of buildings. In this work, a building energy simulation tool is used to study the impact of multiple shortwave inter-reflections in an urban environment. A street canyon model validated in a previous work was modeled in TRNSYS in order to simulate the effects of the urban radiative trapping. An urban canyon with aspect ratio H/W=1 was chosen, with South-North orientation, with transparent/opaque surfaces ratio Atr/Aop=0.5 and 4 values (0.2, 0.4, 0.6, 0.8) of reflectance factor of the envelope surfaces. The goal is to characterize how solar absorption influence the urban energy requirements. The analysis was conducted for 3 cities in different climatic zones: Rome, Palermo and Krakow.

About the shortwave multiple reflections in an urban street canyon building related to three different European climates / Colucci, C.; Mauri, L.; Vallati, A.. - In: MATEC WEB OF CONFERENCES. - ISSN 2261-236X. - 240:(2018), p. 05004. (Intervento presentato al convegno 11th International Conference on Computational Heat, Mass and Momentum Transfer, ICCHMT 2018 tenutosi a Galaxy Hotel, Gesia Street, pol) [10.1051/matecconf/201824005004].

About the shortwave multiple reflections in an urban street canyon building related to three different European climates

Colucci C.;Vallati A.
2018

Abstract

Energy exchanges between buildings is affected by urban fabric. As a matter of fact, heat exchange between adjacent buildings is due to convective and radiative heat flows. The main parameters which influence these heat exchange mechanisms are due to climate conditions such as air temperatures/humidity, wind speed/direction and solar irradiance. Most building energy simulations are done on an independent single building with typical meteorological year (TMY). These TMY meteorological data cannot represent the state of the urban microclimate and rather ignores the microclimate influence on buildings adjacent to street canyons. However, solar radiation shading and reflection of the environment within the street canyons are important factors affecting the energy consumption of buildings. In this work, a building energy simulation tool is used to study the impact of multiple shortwave inter-reflections in an urban environment. A street canyon model validated in a previous work was modeled in TRNSYS in order to simulate the effects of the urban radiative trapping. An urban canyon with aspect ratio H/W=1 was chosen, with South-North orientation, with transparent/opaque surfaces ratio Atr/Aop=0.5 and 4 values (0.2, 0.4, 0.6, 0.8) of reflectance factor of the envelope surfaces. The goal is to characterize how solar absorption influence the urban energy requirements. The analysis was conducted for 3 cities in different climatic zones: Rome, Palermo and Krakow.
2018
11th International Conference on Computational Heat, Mass and Momentum Transfer, ICCHMT 2018
shortwave multiple reflections
04 Pubblicazione in atti di convegno::04c Atto di convegno in rivista
About the shortwave multiple reflections in an urban street canyon building related to three different European climates / Colucci, C.; Mauri, L.; Vallati, A.. - In: MATEC WEB OF CONFERENCES. - ISSN 2261-236X. - 240:(2018), p. 05004. (Intervento presentato al convegno 11th International Conference on Computational Heat, Mass and Momentum Transfer, ICCHMT 2018 tenutosi a Galaxy Hotel, Gesia Street, pol) [10.1051/matecconf/201824005004].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1350418
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