Numerical Simulation of Natural Ventilation of a Folio Multi-Sash Mid-Pivoted Window with Vertical Deflectors in a Room

As a result of protean outdoor wind speed and wind direction, inducting natural wind was confined. In order to improve natural ventilation of opening, a new-type window called folio multi-sash mid-pivoted window with vertical deflectors was designed. Based of FLUENT -one of widespread use CFD software, performances of natural ventilation with side-hung window, sliding window and folio multi-sash mid-pivoted window with vertical deflectors were studied through building computed models of natural ventilation on 25 kinds of conditions which were divided with three-kind of wind speeds in 1 m/s, 2 m/s, 3 m/s and five-kind of wind angles in 0°, 22.5°, 45°, 67.5°, 90°. The CFD computational results were approximately consistent with measured data, and the credibility was very well. According to numerical computation picture, specific airflows in opening and surrounding of window and indoor space could be easily got and observed, which were difficult to get by experiments. Thus making use of numerical computation results, natural ventilation performance of the new-type window was able to be compared with that of side-hung window and sliding window, and how wind speed and wind direction influenced natural ventilation performance of the new-type window was able to be analyzed, moreover to suggest better design. Compared with actual measuring and wind tunnel test, adopting CFD software was easy to get results software and could supply across-the-aboard design guide for improvement and popular application of new-type energy-saving window.