| 摘要 |
<p>The panel (11) carries an array of light-emitters (2) e.g. 10 mm wide on the vertical front face (3) of a support (4) behind a transparent plate (6). Between the face and the plate a mask (12) of sheet metal has rectangular or square slots (13) corresponding to the emitters, and fins (14) inclined slightly above the horizontal under the slots. The distance (L) of e.g. 57 mm between the mask and face is such that solar rays (8) incident at angles above a minimum (e.g. 10 degrees ) cannot impinge upon any emitter. Heat absorbed by the mask is dissipated into an upward air current from a fan (25).</p> |
