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Solar Vacuum Tube:
1) The glass adopts boron-silicon 3.3 glass required by ISO3585:1991. This glass has many good characteristics such as strong alkali tolerance, high sun transmission factor and impact resistance and so forth
2) Heat collector tube adopts magnetron sputtering coating technology
3) Sediment gradual change selectivity sun absorbing coat (A1-N/A1) has very high absorptivity and very low emissivity for sun
a) Sun absorptance: &lpha;&e;0.92 (AM1.5)
b) Bemisphere emission ratio: &psilonh;&e;0.086 (80+5⪚ C)
c) Temperature of open shine: ts&e;220M2⪚ C
d) Gas pressure of vacuum interlayer: p&e;5 x 10-3Pa
e) Radiant exposure of close shine: H&e;3.8MJ/sam
f) Average heat waste coefficient: UIt&e;.90W/ (M2⪚ C)
4) Can resist impact of hail and is suitable for cold area in winter
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