Why have Evacuated Glass Tube collectors not been seen around much?

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Why have Evacuated Glass Tube collectors not been seen around much?

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Most solar hot water units in Australia still use an early system called the flat plate panel system to heat water. However, energy is becoming scarcer and there is a need for more advanced technology to approach higher efficiency and to meet demands for renewable energy. Evacuated tubes have already been used for years in Germany, Canada, China and the UK. In comparison to the flat plate panel system, how does the evacuated tube panel offer more efficiency? The keys to achieve higher efficiency are to maximize solar heat gain and minimize heat loss. Inside the inner tube, coating with absorptive material holds the copper tube where the water flows. The design of evacuated space between two glass tubes is to maximize suns ray gain and transfer the solar energy to heat the water inside the inner tube effectively. A vacuum is an excellent insulator to eliminate convective heat loss. Flat panel solar collectors can produce a similar heat output to evacuated tube collectors, but generally

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