Evacuated solar vacuum tube solar collector basic specifications: type. Length=1200. Length=1500. Length=1500. Length=1800. Glass thermal energy parameter. 3.3*10. -6. /. 3.3*10. -6. /. 3.3*10. -6. /. 3.3*10. -6. /. Outer glass tube diameter. 47mm. 47mm. 58mm. 58mm. Inner glass tube diameter. 37mm. 37mm. 47mm. 47mm. Thickness of the glass tube. 1.6mm. 1.6mm. 1.8mm. 1.8mm. Transmission ratio of the outer glass tube. >0.80. >0.80. >0.80. >0.80. Length of the vacuum tube. 1200mm. 1500mm. 1500mm. 1800mm. Solar selective absorber coating. Al-n/al. Al-n/al. Al-n/al. Al-n/al. Absorptance (am1.5). >0.93. >0.93. >0.93. >0.93. Emission ration (80). <0.07. <0.07. <0.07. <0.07. Atmospheric pressure intensity in vacuum jacket. P<5*10. -3. P<5*10. -3. P<5*10. -3. P<5*10. -3. Stagation temperature. >230 deg. C. >230 deg. C. >230 deg. C. >230 deg.c. Heat loss coefficient. <0.75w/m. 2. <0.75w/m. 2. <0.75w/m. 2. <0.75w/m. 2. Hail resistant ability. <25mm. <25mm. <25mm. <25mm. Max. Pressure resistant ability. 0.8mpa. 0.8mpa. 0.8mpa. 0.8 mpa. Model no.:. Dia. 47 with length of 1500mm.. Dia. 58 with length of 1500mm. Dia. 58 with length of 1600mm. Dia. 58 with length of 2000mm..
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