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Tank(mm) :outerΦ 460 Vacuum tube:Φ47*1500/Φ58*1800 high effective tube Frame:Cold-rolled steel sheet Material :inner tank stainless steel,SUB304-2B food,0.31mm, outer tank: fluorine titanium, 0.31mm, insulation :55mm polyurethane foam,al-refective banner Specification of vacuum tube structure all glass concentric dual tube geometry, Material borosilicate 3.3 glass Absorptive coating properties Constructure grade AL - Nx/AL solar selective absorptive coating Method of deposition dc reactive sputtering absorptance > 97 % emittance < 3 % Stagnation temperature 250 - 270 c warranty: Work life not less than 15 years Manual control water-feed |