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Avoid condensation in a solar water heater?.

How can I avoid condensation in a collector solar water heater. I thought to try make air tight box and then fill the box with silica gel behind the insulation. Does anyone have a better idea. I think to a wooden air-tight glass box will be difficult.

I doubt you can really "prevent" the condensation of conventional solar panels placed outdoors in a temperate climate, and finally, the temperature of the materials to be below the box dew point of surrounding air and condensation forms. You can ventilate the manifold to provide air flow to dry quickly condensation Once the solar gain has begun, and this would avoid greater losses of refraction in the condensation that you would get in a vent manifold, where condensation hangs around for a long time. You should also minimize the long-term growth of fungus and bacterial film, which would really kill your solar efficiency. But the most effective collectors provide solar glass often fully recover, or create them as "tubes within tubes" that are permanently sealed and evacuated to the vacuum unit life, just as empty bottles to large thermos. See the information on this link to Description of sensors evacuated tube and reflector dish: http://www.eere.energy.gov/buildings/info/components/waterheating/solarhot.html

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