Quote:
Originally Posted by Mercedes Benzene
Could you paint it black?
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In addition to just painting it black, you can get much higher temps with the same amount of sunlight by increasing the pressure inside the glass. Granted, this may very well be beyond what Turtle was thinking, or might require higher tech resources than he'd planned to use, but by pressurizing the tube itself you can get a LOT more bang for each solar buck.
I'm thinking of something similar to the evacuated tubes they use in many new solar hot water heater applications.
Beyond Oil Solar: Solar Evacuated Tubes
