Window-wall area ratio reflects the window-opening area of a room. Window-wall area ratio refers to the ratio of the outside window area of a building to the area of the wall where it is located. The window-wall area ratio should be determined by considering many factors, including sunshine conditions in winter and summer in different regions, outdoor air temperature, window area and building energy consumption. In terms of the opening form of the electric telescopic door in the residential area, the commonly used window type is generally push-pull window, flat window, fixed window and flat window. Want to consider from the structural design of the window above all, the structure of the window is having important effect to. If push pull window slides course to slide back and forth in window frame, there is bigger space on, there is the gap between pulley below, sash forms apparent convection exchange up and down, cause bigger heat loss. And casement window, sash and window frame are generally normal with good rubber seal batten, after the sash is closed, sealing rubber batten is pressed very tightly, almost no gap, it is difficult to form convection.