CFD analysis and experimental comparison of novel roof tile shapes
In tiled pitched roofs, a ventilated layer reduces the heat transfer between tiles and roof structure by means of natural and forced convection, thereby also reducing the cooling energy requirement. This effect could be enhanced by increasing the air permeability between the tiles by means of novel...
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doaj-07a283c41f844a0d9305e8d00062fc022020-11-24T22:13:51ZengElsevierPropulsion and Power Research2212-540X2017-06-016213413910.1016/j.jppr.2017.05.006CFD analysis and experimental comparison of novel roof tile shapesMichele Bottarelli0Giovanni Zannoni1Marco Bortoloni2Richard Allen3Nigel Cherry4Department of Architecture, University of Ferrara, Via Quartieri 8, 44121 Ferrara, ItalyDepartment of Architecture, University of Ferrara, Via Quartieri 8, 44121 Ferrara, ItalyDepartment of Architecture, University of Ferrara, Via Quartieri 8, 44121 Ferrara, ItalyMonier Technical Centre GmbH, Rembrücker Str. 50, 63150 Heusenstamm, GermanyMonier Technical Centre GmbH, Rembrücker Str. 50, 63150 Heusenstamm, GermanyIn tiled pitched roofs, a ventilated layer reduces the heat transfer between tiles and roof structure by means of natural and forced convection, thereby also reducing the cooling energy requirement. This effect could be enhanced by increasing the air permeability between the tiles by means of novel tile shapes, as proposed by the HEROTILE European project (LIFE14 CCA/IT/000939), of which this work presents the preliminary analysis supporting the new tile designs. Using an experimental rig, the air pressure difference and the volumetric flow rate between tiles have been measured for an existing Portoghese tile design over a range of pressures. Then, in order to understand the air flows under different conditions, a three-dimensional computational fluid dynamics (CFD) model has been implemented to recreate the full geometry of the rig. The model was calibrated against the aforementioned experimental results, and run with boundary conditions simulating different wind directions. Even in the low velocities typical of average local wind patterns, the fluid dynamic problem remains complex because of the geometry of the gaps between the tiles. However, it has been possible to assess the coefficient of local head loss and then apply it in an analytical relationship between pressure drop and flow rate, taking into account the open area. The results have shown how the wind direction affects the air permeability and, therefore, important insights have been gathered for the design of novel tiles.http://www.sciencedirect.com/science/article/pii/S2212540X17300251Ventilated roofsRoof tilesAir permeabilityExperimental rigComputational fluid dynamics (CFD) |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Michele Bottarelli Giovanni Zannoni Marco Bortoloni Richard Allen Nigel Cherry |
spellingShingle |
Michele Bottarelli Giovanni Zannoni Marco Bortoloni Richard Allen Nigel Cherry CFD analysis and experimental comparison of novel roof tile shapes Propulsion and Power Research Ventilated roofs Roof tiles Air permeability Experimental rig Computational fluid dynamics (CFD) |
author_facet |
Michele Bottarelli Giovanni Zannoni Marco Bortoloni Richard Allen Nigel Cherry |
author_sort |
Michele Bottarelli |
title |
CFD analysis and experimental comparison of novel roof tile shapes |
title_short |
CFD analysis and experimental comparison of novel roof tile shapes |
title_full |
CFD analysis and experimental comparison of novel roof tile shapes |
title_fullStr |
CFD analysis and experimental comparison of novel roof tile shapes |
title_full_unstemmed |
CFD analysis and experimental comparison of novel roof tile shapes |
title_sort |
cfd analysis and experimental comparison of novel roof tile shapes |
publisher |
Elsevier |
series |
Propulsion and Power Research |
issn |
2212-540X |
publishDate |
2017-06-01 |
description |
In tiled pitched roofs, a ventilated layer reduces the heat transfer between tiles and roof structure by means of natural and forced convection, thereby also reducing the cooling energy requirement. This effect could be enhanced by increasing the air permeability between the tiles by means of novel tile shapes, as proposed by the HEROTILE European project (LIFE14 CCA/IT/000939), of which this work presents the preliminary analysis supporting the new tile designs.
Using an experimental rig, the air pressure difference and the volumetric flow rate between tiles have been measured for an existing Portoghese tile design over a range of pressures. Then, in order to understand the air flows under different conditions, a three-dimensional computational fluid dynamics (CFD) model has been implemented to recreate the full geometry of the rig. The model was calibrated against the aforementioned experimental results, and run with boundary conditions simulating different wind directions. Even in the low velocities typical of average local wind patterns, the fluid dynamic problem remains complex because of the geometry of the gaps between the tiles. However, it has been possible to assess the coefficient of local head loss and then apply it in an analytical relationship between pressure drop and flow rate, taking into account the open area. The results have shown how the wind direction affects the air permeability and, therefore, important insights have been gathered for the design of novel tiles. |
topic |
Ventilated roofs Roof tiles Air permeability Experimental rig Computational fluid dynamics (CFD) |
url |
http://www.sciencedirect.com/science/article/pii/S2212540X17300251 |
work_keys_str_mv |
AT michelebottarelli cfdanalysisandexperimentalcomparisonofnovelrooftileshapes AT giovannizannoni cfdanalysisandexperimentalcomparisonofnovelrooftileshapes AT marcobortoloni cfdanalysisandexperimentalcomparisonofnovelrooftileshapes AT richardallen cfdanalysisandexperimentalcomparisonofnovelrooftileshapes AT nigelcherry cfdanalysisandexperimentalcomparisonofnovelrooftileshapes |
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1725799659535859712 |