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parallel to the axis of the reflector. Therefore, if DP makes no shadow, it
means that the reflector is properly directed (focused)!
Improperly focused reflector:
the directional pin makes a shadow!
Another visual criterion that the cooker is properly focused is the presence of a
bright spot of concentrated light on the cooking vessel.
In general, focusing the reflector requires rotating in two planes: horizontally
(from left to right) and vertically. In practice, however, for a certain time
interval around noon point, it is enough the rotation to be performed only
in a horizontal plane - from left to right! This due to the fact that during that
period the sun changes only a little its height and therefore the focal spot
remains within the reach of the vessel only by rotating in a single plane. For
example, for the latitude of 42°N (the latitude of Blagoevgrad and Rome) in
summer months, between 11:00 h and 15:00 h, it is sufficient the reflector to be
rotated only horizontally!
Adjusting the position of the reflector is necessary to perform every 20 minutes.
Safety precautions when operating parabolic solar cooker
1. SPC should not be shifted during operation. Only activities related to
refocusing and adjusting are permitted.
2. Within a radius of 3 meters around SK-01 should not be kept flammable or
easy-to-melt materials. The concentrated power of the device in contact with
paper, cardboard, wood, plastic can lead to a rapid ignition and material damage.
Properly focused reflector:
the dirpin makes no shadow!
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