| 摘要 |
A two-axis tracking solar cooking system includes a sunlight concentrator, a two-axis solar tracker, sunlight reflectors, an enclosure, an oven or a stove, and other components. The 90-degree offset parabolic reflector has very long focal length so that all concentrated sunlight will enter the oven through a small window at the focal point of the 90-degree offset parabolic reflector. The elevation rotation axis goes through the focal point so that the oven will remain at the same horizontal level all the time. The concentrated sunlight makes it easy to achieve needed cooking temperature. The two-axis tracking design eliminates the need of frequent adjustment. The 90-degree offset design permits having the oven under shade, so that people do not have to expose themselves to sunlight to do solar cooking. The enclosure significantly reduces the risk of burns and fires. It also makes it very easy to control the cooking process. |
| 主权项 |
1. A parabolic solar concentrator system comprising:
a) a parabolic solar concentrator enclosure having a 90-degree offset parabolic reflector side in the shape of a paraboloid for focusing sunlight to a focal point F located a focal length from the 90-degree offset parabolic reflector side, with b) the 90-degree offset parabolic reflector side having a semi-circular edge with two ends oriented such that a line between the two ends forms a long parallel edge of a trapezoid, with a short parallel edge attached to a base side, with a first converging edge and a second converging edge equal in measurement and attached to the semi-circular top edge and terminating at the short parallel edge, with the 90-degree offset parabolic reflector side having a parabolic reflector face oriented to reflect sunlight toward a sunlight window side, and the short parallel edge is smaller in measurement than the line between the two ends of the semi-circular edge and is equal in measurement to the edge of the base side; c) a sunlight window side comprising an opposite side of the parabolic solar concentrator enclosure from the 90-degree offset parabolic reflector side, the sunlight window side in the shape of a trapezoid having a long parallel edge, with a short parallel edge attached to the base side, with a first converging edge and a second converging edge equal in measurement and attached to the long parallel edge and terminating at the short parallel edge, with the sunlight window side having a sunlight window with a center of a diameter, with the center of the diameter located along a focal line of the 90-degree offset parabolic reflector side and the short parallel edge is smaller in measurement than the long parallel edge and equal in measurement to edge of the base side; d) a first reflector side and a second reflector side in the shape of a trapezoid, the first reflector side and the second reflector side comprising opposite sides of the parabolic solar concentrator enclosure, with the first reflector side and the second reflector side connected between the 90-degree offset parabolic reflector side and the sunlight window side, with the first reflector side having a long parallel edge and a short parallel edge attached to the base side, with the second reflector side having a long parallel edge and a short parallel edge attached to the base side, with the first reflector side having a first converging edge and a second converging edge equal in measurement and attached to the long parallel edge and terminating at the short parallel edge, with the second reflector side having a first converging edge and a second converging edge equal in measurement and attached to the long parallel edge and terminating at the short parallel edge, with the first reflector side having a flat reflector face oriented towards the second reflector side and the second reflector side having a flat reflector face oriented towards the first reflector side, and the short parallel edges of the first reflector side and the second reflector side equal in measurement to and attached to opposite edges of the base side; e) a base side with a first base edge attached to the short parallel edge of the 90-degree offset parabolic reflector side, a second base edge attached to the short parallel edge of the sunlight window side, a third base edge attached to the short parallel edge of the first reflector side and a fourth base edge attached to the short parallel edge of the second reflector side, with all base edges equal in measurement, with a reflector inner face facing towards the sunlight and a base outer face facing away from the parabolic solar concentrator enclosure; f) an elevation tracking rotation axis frame attached to the parabolic solar concentrator enclosure and having a elevation tracking rotation pin with a center that is aligned on the focal line with the center of the diameter of the sunlight window and with the focal point F of the 90-degree offset parabolic reflector side; g) an azimuth tracking rotation axis frame rotationally attached to the elevation tracking rotation axis frame, the azimuth tracking rotation axis frame having a azimuth tracking rotation pin located near the base outer face of the base side, such that the elevation tracking rotation axis frame and parabolic solar concentrator enclosure may rotate independent of the azimuth tracking rotation axis frame to track the sunlight; and h) a sunlight conversion device attached to the azimuth tracking rotation axis frame, and having a sunlight aperture for receiving concentrated sunlight at the focal point F of the 90-degree offset parabolic reflector side. |
