Paper Conference

Proceedings of Building Simulation 2021: 17th Conference of IBPSA


Simulation support for the design of ventilated windows: a case study

Shiva Najaf Khosravi, Ardeshir Mahdavi
Vienna University of Technology, Austria

Abstract: Efforts to develop advance building envelope components include, among other things, ventilated window constructions. These windows utilize the air flow between glazing panes to preheat outside air before it enters indoors. In the framework of a previous research project, an instance of such a system was subjected to experimental studies under real conditions. In the present contribution, we report on high-resolution 3D steady-state CFD simulation of this component. Model results were compared with measurements. The aim was to explore the fidelity of the CFD model and its potential toward design support. Specifically, variables related to the size of the inlet opening as well as the position of double glazing were examined under the assumption of outdoor winter condition. Key innovations This contribution represents an incremental step toward advancing high-resolution CFD-based simulation of the thermal performance of a ventilated window, including the detailed computation of the effect of solar radiation on the preheating potential of the supply air. Practical implications Findings regarding CFD deployment details (number of cells, turbulence models, DO model performance) are relevant for simulation experts. Findings regarding the performance implications of the positioning of the double-layered wing are relevant to ventilated windows' design details.
Keywords: Ventilated window, air flow, optimal spacing, thermal performance
Pages: 3020 - 3027