Abstract
With ridge vents that are commonly used in building ventilation applications as the research object, this study analyzed how design parameters affect the efficiency of thermal buoyancy-driven ventilation induced by ridge vents through computational fluid dynamics (CFD). The design parameters of ridge vents include the width S, height H, and eave overhang E. In consideration of engineering practices, the parameter ranges were set as follows: S = 1.2, 1.8, 2.4, and 3 m; H = 0.3, 0.6, 0.9, and 1.2 m; and E = 0, 0.3, and 0.6 m. The results show that when a ridge vent is under buoyancy-driven ventilation, the height H serves as the dominant design parameter. Correlation equations of the induced ventilation rates with the relevant ridge vent design parameters are provided.
Highlights
Natural ventilation is the process of introducing fresh air into an indoor space by means of natural forces, such as wind and/or thermal buoyancy, instead of the use of mechanical energy
There are many studies on ridge vents, most of which focus on attic ventilation, whole building ventilation, and greenhouse environment control
The results show that the ridge vents had a relatively constant ventilation rate, while the side vents could change from outlet to inlet depending on the incidence angle of the wind
Summary
Natural ventilation is the process of introducing fresh air into an indoor space by means of natural forces, such as wind and/or thermal buoyancy, instead of the use of mechanical energy. Ridge vents (or roof-mounted monitors), which are a common natural ventilation approach, encourage airflow by means of thermal buoyancy or wind. Iffa and Tariku [7] discussed how changes in roof sheathing, ceiling insulation (baffle size) and locations of the vent area affect the air and temperature distributions in the attic space in summer and winter Their results show that when the airflow was driven by wind, increasing the baffle size significantly influenced the air distribution. In this study, CFD numerical simulations were conducted to investigate the influence of ridge vent design parameters on the efficiency of indoor buoyancy-driven ventilation. Iinn wwhhiicchh vvzz(i(,ij,)j:) O: Ouutwtwaradrdvevleolcoitcyity(co(cmompopnoennetnint itnheth+eZ+dZirdeicrteioctnio) nat) patospiotisointio(in, j()i,ajt)tahtethe hhoorizontal openinngg ((mm//ss) (opening: Figurree 22bb,, wwiiddtthhSS(m(m),),lelennggthth1818mm) )∆AΔi,Aj:i,Uj n: iUt nit ccrroossss--sseeccttiioonn aarreeaaaatttthheeooppeenniningg(m(m2 )2.)
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