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In page Solar thermal collector:

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Absorber piping configurations include:

  • flooded: consisting of two sheets of metal molded to produce a wide circulation zone that improves heat transfer;
  • boundary layer: consisting of several layers of transparent and opaque sheets that enable absorption in a boundary layer. Because the energy is absorbed in the boundary layer, heat conversion may be more efficient than for collectors where absorbed heat is conducted through a material before being accumulated in the circulating liquid.[citation needed]