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Article

Experimental Study of Thermal Buoyancy in the Cavity of Ventilated Roofs

by
Nora Schjøth Bunkholt
1,*,
Toivo Säwén
2,
Martina Stockhaus
2,
Tore Kvande
3,
Lars Gullbrekken
1,
Paula Wahlgren
2 and
Jardar Lohne
3
1
SINTEF Community, 7046 Trondheim, Norway
2
Department of Architecture and Civil Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
3
Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
*
Author to whom correspondence should be addressed.
Buildings 2020, 10(1), 8; https://doi.org/10.3390/buildings10010008
Submission received: 7 October 2019 / Revised: 3 December 2019 / Accepted: 4 December 2019 / Published: 7 January 2020
(This article belongs to the Section Building Energy, Physics, Environment, and Systems)
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Abstract

Pitched wooden roofs are ventilated through an air cavity beneath the roofing in order to remove heat and moisture from the roof construction. The ventilation is driven by wind pressure and thermal buoyancy. This paper studies ventilation driven by thermal buoyancy in the air cavity of inclined roofs. The influence of air cavity design and roof inclination on the airflow is investigated. Laboratory measurements were carried out on an inclined full-scale roof model with an air cavity heated on one side in order to simulate solar radiation on a roof surface. Equipment to measure temperature was installed in the roof model, while air velocity in the cavity was determined by smoke tests. Combinations of different roof inclinations, air cavity heights and applied heating power on the air cavity top surface were examined. The study showed that increased air cavity height led to increased airflow and decreased surface temperatures in the air cavity. Increased roof inclination and heating power applied to the roofing also increased the airflow. The investigations imply that thermal buoyancy in the air cavity of pitched roofs could be a relevant driving force for cavity ventilation and important to consider when evaluating the heat and moisture performance of such a construction.
Keywords: thermal buoyancy; air cavity; natural ventilation; pitched roof; wood construction thermal buoyancy; air cavity; natural ventilation; pitched roof; wood construction

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MDPI and ACS Style

Bunkholt, N.S.; Säwén, T.; Stockhaus, M.; Kvande, T.; Gullbrekken, L.; Wahlgren, P.; Lohne, J. Experimental Study of Thermal Buoyancy in the Cavity of Ventilated Roofs. Buildings 2020, 10, 8. https://doi.org/10.3390/buildings10010008

AMA Style

Bunkholt NS, Säwén T, Stockhaus M, Kvande T, Gullbrekken L, Wahlgren P, Lohne J. Experimental Study of Thermal Buoyancy in the Cavity of Ventilated Roofs. Buildings. 2020; 10(1):8. https://doi.org/10.3390/buildings10010008

Chicago/Turabian Style

Bunkholt, Nora Schjøth, Toivo Säwén, Martina Stockhaus, Tore Kvande, Lars Gullbrekken, Paula Wahlgren, and Jardar Lohne. 2020. "Experimental Study of Thermal Buoyancy in the Cavity of Ventilated Roofs" Buildings 10, no. 1: 8. https://doi.org/10.3390/buildings10010008

APA Style

Bunkholt, N. S., Säwén, T., Stockhaus, M., Kvande, T., Gullbrekken, L., Wahlgren, P., & Lohne, J. (2020). Experimental Study of Thermal Buoyancy in the Cavity of Ventilated Roofs. Buildings, 10(1), 8. https://doi.org/10.3390/buildings10010008

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