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pUre evacuated tubes

Direct flow is a very simple system that works in a similar fashion to a conventional flat plate collector but with the benefit of vacuum insulation.

The U-pipe collectors have the same copper tube as a traditional heat pipe collector, but it instead bends around on itself at the bottom of the glass tube and returns directly into the double manifold. This enables the heat transfer fluid to travel through the tube for direct gain from solar radiation. As this heat transfer fluid is heated, it is pumped around the collector tubes and eventually passes through the secondary coil in the hot water storage cylinder. The pUre U-pipe collectors require fewer tubes up on the roof than heat pipe to reach the same peak efficiency levels.

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