The sun is the cook. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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The sun is the cook. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Alternative energy sources

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Solar technology is one of the promising areas of modern energy. Perhaps the day is not far off when powerful solar panels will power entire factories and plants. So far, however, these are just projects and experiments. But our readers know that for household needs it is quite possible to "tame" solar energy today. For example, why not use the heat of the sun to warm up food on a forest lawn or summer cottage on a hot summer day?

From the school course in optics, you know that a beam of light rays incident on a concave spherical mirror parallel to its optical axis, being reflected, passes through the focus of the mirror. Let's use this phenomenon. Let us orient the mirror so that its optical axis is aimed exactly at the sun. Since the luminary is located at a distance from the mirror, which is huge in comparison with the size of the mirror itself, the sun's rays falling on it can be considered parallel. This means that a large amount of solar energy will be concentrated in the focus of the mirror. On a hot summer day (especially if you live in the southern regions of our country), you can get quite a high temperature on a "solar tile" using such a mirror.

The tile consists of three main parts: a mirror, a box (body) and a stand. The blank for the base of the box is a square sheet of plywood marked as shown in the figure. In the center of the base square, install a steel or aluminum rod 50 cm long with a thread at the end for screwing the stand on the thrust bearing. Four plywood rectangles are the future walls of the box. Cut grooves for plywood ribs along the marking lines. Cut them as shown in the picture and glue them to the base. When the ribs are firmly glued, put the walls of the box in place, after cutting grooves in them for the ends of the ribs. Attach the walls to the base with glue and steel brackets. Cut the upper edges of the walls to the size of the ribs. (The trim lines of the parts are shown as dotted lines in the figure.)

The sun is the cook

The solar tile body is ready. Let's start making a mirror. Its surface is laid out from triangles cut out of thick smooth cardboard. They are glued to the upper edges of the ribs and overlap each other. This operation should be done very carefully and carefully. The adhesive should be applied in an even thin layer. Reliable contact should be along the entire length of the rib. It remains to paste over the cardboard surface with aluminum foil with the same accuracy - and you get a concave spherical mirror.

You know that the focal length of a spherical mirror is half the radius of its curvature. At this distance from the center of the mirror and place a stand for a pot or pan.

The stand is designed and connected to the axis so that it can be installed strictly horizontally in any position of the device (see Fig. ). Nearby you see the simplest device that allows you to quickly change the orientation of the mirror to the sun. A metal rod or tube with holes is stuck into the ground, one of which has a steel pin inserted. A wire loop clings to it, the ends of which are screwed to the bottom of the box. The sun moved in the sky - the hairpin was moved to another hole on the peg, and the angle of the mirror changed. The tile worked again.

Author: M.Lukic

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