| 摘要 |
The importance and necessity of economizing energy is clear to all. During the summer season, some part of the coolness in the buildings may be wasted because of the heat cause by the sun shine. On the other hand, sun heat can be used to keep the house warm during the winter and reduce the use of heating systems. In the present invention, a gray anti-UV Thin Sheet Plexiglass has been used and it consists of different degrees of darkness. The degree of darkness differs from the top to the bottom and it changes from the lowest extent of darkness to the highest. The height of this sheet is several times as high as the height of window and it is coiled around two cylinders from the up and down side. One of the cylinders is placed in the upper frame of the window and the other one is in the bottom frame. |
