Click here to visit our sponsor

อ่านพบในหนังสือ MECHANICAL AND ELECTRICAL EQUIPMENT FOR BUILDINGS 7th Edition Volume 1 แต่งโดย Benjamin Stein, John S. Reynolds, William J. McGuinness (p.297-299) เห็นว่าน่าสนใจ เลยตัดมาให้ลองศึกษาดูครับ

A related component that can combine the functions of both glazing and sunshading is the air extract window diagrammed in Fig.6.7. Developed in Scandinavia in the 1950s and now utilized in the United States as well, this is a triple-glazed window that passed room air between a typical outer double-glazed window and an inner single pane. The inner pane thus is kept at very nearly the same temperature as the room air, which greatly increase comfort near windows on very cold (or very hot) days. Venetian blinds are often inserted in this cavity, where they can intercept direct sun and redirect its light toward the ceiling. The solar heat intercepted by the blind is carried off by the room air to a plenum above the ceiling, where such air can be either exhausted or recirculated, and its heat content either reclaimed or rejected. The U value of these windows is dependent upon the rate of air flow between the glazing (Fig.6.7c); typical flow rates are 4 to 6 cfm per foot of window width.