CFD modelling and thermal performance analysis of a wooden ventilated roof structure

Villi, Giacomo; Pasut, Wilmer; Carli, Michele De

doi:10.1007/s12273-009-9414-7

Cited by 36 publications

(19 citation statements)

References 17 publications

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“…In regard to the timber structure, Chinese roof shapes were markedly flexible and were curved or concave to protect against moisture migration (i.e., rain or melting snow seeping back into the roof) [40]. Moreover, the roof volume was a significant proportion of the entire building [41], and large roofs resulted in a profound and stunning impression because of their gorgeous, aesthetic and exquisite appearance. The design approach is a primary research topic of this study and is detailed in the following sections.…”

Section: Curved and Large Roofs Stylesmentioning

confidence: 99%

Semantic 3D Modeling Based on CityGML for Ancient Chinese-Style Architectural Roofs of Digital Heritage

Lin

Tang

Zhu

et al. 2017

IJGI

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Ancient Chinese-style architecture has received increased attention during the last century as a segment of cultural heritage and is of great significance, specifically in regard to the process of digitizing and modeling these buildings to preserve and protect this heritage. Because the roof form reflects the age of the structure, the structural character and the historical culture of the ancient building, constructing a refined model for the roof is a primary aspect of the 3D modeling procedure. To avoid cumbersome traditional modeling approaches that use geometry units, such as points, lines and triangles, a flexible semantic method is proposed in this study to improve modeling efficiency and reduce the professional requirements. In this method, a two-level semantic decomposition of the roof is presented according to the characteristics of ancient Chinese-style architecture. The structural level reveals the basic components that determine its structural shape, and the decorative level refers to the attached components that influence the exterior appearance. The assembly validity of the decomposed elements and the combined diversity of the integrated entities are ensured by topological constraints and derived transformations of the semantic components. This proposed method was implemented by utilizing CityGML (City Geography Markup Language) via the ADE (Application Domain Extension) mechanism and was tested by modeling the principal buildings included in the Palace Museum.

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Section: Curved and Large Roofs Stylesmentioning

confidence: 99%

Semantic 3D Modeling Based on CityGML for Ancient Chinese-Style Architectural Roofs of Digital Heritage

Lin

Tang

Zhu

et al. 2017

IJGI

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“…Temperature and air flow conditions in ventilated pitched wooden roofs have been studied both numerically (e.g., Refs. [4,5]) and experimentally (e.g., Refs. [6][7][8]).…”

Section: Introduction mentioning

confidence: 99%

Influence of Local Weather Conditions on Ventilation of a Pitched Wooden Roof

Bunkholt¹,

Gullbrekken²,

Kvande³

2020

JCEA

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This paper investigates the influence of temperature and wind conditions on ventilation of the air cavity beneath the roofing in a full-scale pitched wooden roof construction. The potential for condensation in the air cavity is studied. The relevant roof construction is equipped with 81 thermocouples and four air velocity measurement devices. A weather station at the site records outdoor temperature and wind conditions. Five periods between 2016 and 2018 are investigated. The findings show distinct periods of below-ambient temperature and positive condensation potential in the ventilated air cavity of the roof. A relation between low wind speed and positive condensation potential is shown. Difference in size of periods with below-ambient temperature and periods with positive condensation potential implies that the materials in the roof regulate the humidity in the air cavity. Large negative peaks in the condensation potential indicate dry-out of the construction.

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“…In fact, ventilation cavity reduces cooling load and building energy demand [11] in summer, due to the surface shading and heat removed by the air flow. Ventilated roof performances are more remarkable than conventional roof in both summer and winter conditions [12,13]. Ventilated roof performances can be improved using upgrading systems as a function of different effects of summer and winter regimes [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Thermal behavior evaluation of ventilated roof under summer and winter conditions

Bianco¹,

Diana²,

Manca³

et al. 2017

IJHT

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One of the European Directive priorities is the development of new strategies for "very low energy buildings". In regions with high level of solar radiation, ventilation allows the cooling load during summer period and contributes to the reduction of the energy needs of buildings. The most important advantages are the reduction of the heat fluxes transmitted by the structures exposed to solar radiation, thanks to the combined effect of shading surfaces and heat removed by the air flow rate within the ventilated air gap. This paper illustrates a numerical investigation on a prototypal ventilated roof for residential use. The investigation is performed in order to evaluate thermofluidodynamic behaviors of the ventilated roof as a function of the different conditions applied on the top wall and the bottom wall of the ventilated cavity in summer and winter regimes. Different values of heat fluxes are applied on the top wall of the ventilated cavity to simulate typical summer and winter days conditions, whereas the bottom wall is assumed isothermal and different values of wall temperature are considered. The problem is solved by means of the commercial code Ansys-Fluent. Results are given in terms of temperature and velocity distributions, air velocity and temperature profiles along different longitudinal and cross sections of the ventilated layer in order to estimate differences between analyzed conditions.

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CFD modelling and thermal performance analysis of a wooden ventilated roof structure

Cited by 36 publications

References 17 publications

Semantic 3D Modeling Based on CityGML for Ancient Chinese-Style Architectural Roofs of Digital Heritage

Semantic 3D Modeling Based on CityGML for Ancient Chinese-Style Architectural Roofs of Digital Heritage

Influence of Local Weather Conditions on Ventilation of a Pitched Wooden Roof

Thermal behavior evaluation of ventilated roof under summer and winter conditions

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