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The design has been inspired by the [[CooKit]], however using instead of a few reflecting panels, the Lightoven I incorporates many segments, which follow a parabolic curve on a reflecting bottom plate. The vertical focal line should ideally hit the cooking pot entirely. However when the angle of incident rays is not perpendicular to the reflector, the focal line tends to elongate. Reflector and cooking vessel are therefore designed in a way that all rays are reflected onto the cooking vessel - provided the sun elevation is at its geometrical optimum. The present design of the cooker is best suitable for medium elevation, i.e. the latitude of central Europe. The parabolic reflector can be tilted from vertical orientation by about 15° backwards to account for higher sun elevation angles. [[File:Lightoven_transport_ready,_1-2-13.jpg|thumb|330px|The [[Lightoven I]] packed for transport with the reflector rolled around the cooking container.]] |
The design has been inspired by the [[CooKit]], however using instead of a few reflecting panels, the Lightoven I incorporates many segments, which follow a parabolic curve on a reflecting bottom plate. The vertical focal line should ideally hit the cooking pot entirely. However when the angle of incident rays is not perpendicular to the reflector, the focal line tends to elongate. Reflector and cooking vessel are therefore designed in a way that all rays are reflected onto the cooking vessel - provided the sun elevation is at its geometrical optimum. The present design of the cooker is best suitable for medium elevation, i.e. the latitude of central Europe. The parabolic reflector can be tilted from vertical orientation by about 15° backwards to account for higher sun elevation angles. [[File:Lightoven_transport_ready,_1-2-13.jpg|thumb|330px|The [[Lightoven I]] packed for transport with the reflector rolled around the cooking container.]] |
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| − | At 52°N latitude, the direct insolation, which is a function of the sun elevation and visibility, can reach about 500 W/m2 in winter and up to 900 W/m2 during summer (at 10° and 65° elevation, respectively). Tests throughout the year have shown that the Lightoven can easily reach boiling temperatures in this elevation range, with the best performance between 30° and 50°. The Lightoven therefore turns out to be an all-season solar cooker for this latitude |
+ | At 52°N latitude, the direct insolation, which is a function of the sun elevation and visibility, can reach about 500 W/m2 in winter and up to 900 W/m2 during summer (at 10° and 65° elevation, respectively). Tests throughout the year have shown that the Lightoven can easily reach boiling temperatures in this elevation range, with the best performance between 30° and 50°. The Lightoven therefore turns out to be an all-season solar cooker for this latitude. Read the [[Media:Lightoven_solar_cooker,_1-2-13.pdf|test results]]. |
==See also== |
==See also== |
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