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re: simple extreme bang for buck approach
27 jan 2002
n. thornton wrote:
>a big (8' plus) tracking dish sits outside a (preferably high up)
>window, and reflects the sunlight in thru the window onto the ceiling,
>or a hotplate close to the ceiling. the window glass would need to be
>replaced with oven door type heat resistant glass.
maybe not. if the glass absorbs 2% of the heat and fresnel-reflects 8% and
it can be 200 f on a 100 f day under n suns, with 1.5 btu/h-f of thermal
conductance to still air, 250x0.02n = (200-100)2x1.5, so n = 60 suns.
it might focus onto a water-cooled target.
nick
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