[Greenbuilding] Fresnel lenses box solar cooker

[sanjay jain]

>The problem is not just the cost of the lenses.  In order to get the same output as a 20 meter^2 PV panel array, you need 20 meter^2 of Fresnel lenses; and some means of holding it very steady in the wind, a precise distance away from the collector; plus be able to move the whole unit (including the cooling system), very precisely throughout the day, every day.


The fresnel lenses are fairly small and only a few inches away from the cell. No need to hold it steady in the wind.

An example: http://energy.gov/articles/keeping-america-competitive-solar-manufacturing-boost-san-diego

Here's an interesting link: http://www.greenrhinoenergy.com/solar/technologies/pv_concentration.php

~sanjay
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