At present in the market sells the solar water heater or the collector, has the reflector. Its leading role is causes from the solar energy of light which two between slits illuminate down to reflect to in the vacuum collection heat pipe's shady side absorption coating, namely reduced sunlight waste. The transmitted light several reflection way on the surface, which kind of pattern of reflection can we choose us to need the reflector.
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Solar energy retro-reflecting material environment experiment
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