Implications of Model Complexity for the Simulated Thermal Behavior of a Casement Window

Central Europe towards Sustainable Building

生态环境科学

Khosravi, S.N.^1 ; Šikula, O.^2 ; Pont, U.^1 ; Mahdavi, A.^1

Department of Building Physics and Building Ecology, TU Vienna, Austria^1

Institute of Building Services, Brno University of Technology, Czech Republic^2

关键词: CFD (computational fluid dynamics);    Convective heat transfer;    Conventional constructions;    Indoor environmental quality;    Interstitial space;    Isothermal boundary conditions;    Surface condensation;    Thermal Performance;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/290/1/012077/pdf
DOI  :  10.1088/1755-1315/290/1/012077

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Windows have been a subject of interest for research in building industry due to their multifaceted and significant implications for indoor environmental quality and energy use. In this context, the present contribution explores the retrofit opportunity toward retrofit of casement windows via application of vacuum glazing. The first scenario included conductive and convective heat transfer processes. The second, more detailed scenario took, in addition, the effects of (long-wave) radiation phenomena into account. The main objective of the present contribution is thus to contrast the results obtained from primarily conductive and convective computations with those that involve a detailed coupled conductive, convective, and radiation simulation. The study benefits from a CFD (Computational Fluid Dynamics) model to evaluate the airflow patterns (temperature and velocity) within the window's interstitial space by assuming isothermal boundary conditions. Based on simulation results, the thermal performance of the retrofitted casement window (with vacuum glass applied as external pane) can be compared to the conventional construction. Thus, benefits in terms of reduced energy use and surface condensation risk can be documented.