Windows And Natural Ventilation

The open position of a window determines how well it provides natural ventilation. The wind is deflected if it strikes the glass surface. The direction of wind is unpredictable, and in order to provide ventilation without cold drafts, you have to keep the wind away from people. When you want the wind to provide cooling, it needs to flow across the body. Windows with multiple positions can offer control.

Fixed glazing allows heat and light to pass through, but provides no ventilation. Casement windows (Fig. 22-1) open fully, and the swing of the sash can divert a breeze into a room. Double-hung windows (Fig. 22-2) can only open half of their area, either at the top, the bottom, or part of each. Sliding windows also only allow ventilation through half of their surface area. Awning or hopper (Fig. 22-3) windows allow air through while keeping rain out. Jalousie windows are horizontal glass or wood louvers that pivot simultaneously in a common frame. They are used primarily in mild climates to control ventilation while cutting off visibility from outside. Sashes that pivot 90° or 180° about a vertical or horizontal axis at or near their centers are used in multistory or high-rise buildings. They are operated only for cleaning, maintenance, or emergency ventilation.

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