| 摘要 |
<p>A concave mirror (7) is hingedly mounted above a fixed heat-insulated space (1) and cooperates with a convex mirror (20) on its focus line to reflect sun rays through a slot (6) in top wall (4) of space (1). To bring a maximum amount of radiation in space (1), also when sun is low, and with a limited height of the apparatus, mirror (7) has the shape of a surface described by a straight line which moves parallel with slot (6) on a directrix which forms at the most half of a parabola, and the hinge axis (9) of mirror (7) passes by the parabola vertex, parallel with slot (6). Indirect radiation is also reflected through slot (6) by a second concave mirror (24) hingedly mounted on the other side of the slot (6) above space (1), a cooperating horizontal plane mirror (34) and a small mirror (38) hingedly mounted above slot (6). In the slot (6) two flat mirrors (35 and 36) form a funnel.</p> |
