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Germany: Vacuum Tube Collectors withstand 40 mm Hailstones

Submitted by Baerbel Epp on June 30, 2011

 Hail map of Switzerland” The extra-thick double-glass vacuum tubes by German company Soltark have survived a test with 40 mm hailstones at the Swiss test institute SPF Solartechnik in Rapperswil. A systematic investigation of vacuum tubes at SPF Rapperswil two years ago showed that most of the 26 tested vacuum tube collectors were damaged after several hits with 35mm hailstones. In large parts of Switzerland, however, hail with a thickness of 30 mm must be expected at least once in 50 years (red-coloured areas in the above map). More and more Swiss building insurers are adopting rules for the hail resistance of solar collectors, which the owners hope to incorporate into already existing insurance contracts.

Source: www.hagelregister.ch

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