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Hygrothermal simulation of cathedral ceiling roofs with ventilated roofing tiles

Hygrothermal simulation of cathedral ceiling roofs with ventilated roofing tiles The surface temperature of the sub-roof beneath the ventilation layer and the tiles is one of the most important factors for the hygrothermal performance of pitched roofs. The air layer between tiles and sub-roof and the air exchange with the outdoor air influence the heat transfer and therefore affect the moisture level inside the roof construction. The paper aims to discuss these issues.Design/methodology/approachThis paper provides the results of a research project performed at Fraunhofer-Institute for Building Physics, based on field test results. The investigations analyze the thermal behavior of different vented and ventilated roof constructions.FindingsIt was found that for a detailed model with roof cladding and ventilated air layer normally too many parameters are unknown. For that reason a simplified approach was set up, especially to consider the radiation exchange between the tiles and the underlay as well as the effects of the ventilation.Originality/valueNow, effective surface transfer parameters can substitute both cladding and air layer in the simulation, while the approach still provides a high accordance with the measured values. The paper provides characteristic values for different roofing situations to simulate ventilated roofs by means of hygrothermal simulation in a simplified way. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Building Pathology and Adaptation Emerald Publishing

Hygrothermal simulation of cathedral ceiling roofs with ventilated roofing tiles

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References (1)

Publisher
Emerald Publishing
Copyright
© Emerald Publishing Limited
ISSN
2398-4708
DOI
10.1108/ijbpa-06-2018-0049
Publisher site
See Article on Publisher Site

Abstract

The surface temperature of the sub-roof beneath the ventilation layer and the tiles is one of the most important factors for the hygrothermal performance of pitched roofs. The air layer between tiles and sub-roof and the air exchange with the outdoor air influence the heat transfer and therefore affect the moisture level inside the roof construction. The paper aims to discuss these issues.Design/methodology/approachThis paper provides the results of a research project performed at Fraunhofer-Institute for Building Physics, based on field test results. The investigations analyze the thermal behavior of different vented and ventilated roof constructions.FindingsIt was found that for a detailed model with roof cladding and ventilated air layer normally too many parameters are unknown. For that reason a simplified approach was set up, especially to consider the radiation exchange between the tiles and the underlay as well as the effects of the ventilation.Originality/valueNow, effective surface transfer parameters can substitute both cladding and air layer in the simulation, while the approach still provides a high accordance with the measured values. The paper provides characteristic values for different roofing situations to simulate ventilated roofs by means of hygrothermal simulation in a simplified way.

Journal

International Journal of Building Pathology and Adaptation – Emerald Publishing

Published: Jul 31, 2019

Keywords: Air layer; Heat exchange; Hygrothermal simulation; Pitched roofs; Ventilated roofs; WUFI

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