| Model | Seido 2-8 | Seido 2-16 | | Design | Evacuated Tube with Flow-Through Design | Evacuated Tube with Flow-Through Design | | Dimensions (LxWxH) | 83.7 x 37.80 x 5.91 in 2126 x 960 150 mm | 83.7 x 75.59 x 5.91 in 2126 x 1920 x 150 mm | | Number of Tubes | 8 | 16 | | Vacuum Tube Glass Material | high quality borosilicate | high quality borosilicate | | Wall Thickness | 0.098 in, 2.5 mm | 0.098 in, 2.5 mm | | Tube Outside Diameter | 4 in, 100 mm | 4 in, 100 mm | | Tube Length | 78.7 in, 2000 mm | 78.7 in, 2000 mm | | Tube Weight | 10 lbs | 10 lbs | | Hailstone Resistant to | 1.38 in, 35 mm | 1.38 in, 35 mm | | Vacuum | <75-6 torr ( 10-5 mbar) | <75-6 torr ( 10-5 mbar) | | Collector Surface Area | 21.8 ft2, 2.0 m2
| 43.6 ft2, 4.0 m2
| | Absorber Surface Area | 15 ft2, 1.4 m2
| 30 ft2, 2.8 m2
| | Angle of Inclination | 0-90° | 0-90° | | Module Weight | 110 lbs, 50 kg | 220 lbs, 100 kg | | Pressure drop per module | <0.24 ft H20 (7 mbar) @ 0.44 gpm (100 L/h) | 0.67 ft H20 (20 mbar) @ 0.88 gpm (200 L/h) | | Test Pressure | 145 psi, 10 bar | 145 psi, 10 bar | | Operating Pressure | 87 psi, 6 bar | 87 psi, 6 bar | | Fluid Content | 0.34 gal, 0.48 L | 0.68 gal, 0.96 L | | Absorber Material | Aluminum | Aluminum | | Selective Surface Coating | Aluminum Nitride | Aluminum Nitride | | Absorption Coefficient | > 92% | > 92% | | Emission Coefficient | < 8% | < 8% | | Typical Operating Temperature | 158-248°F (70-120°C) | 158-248°F (70-120°C) | | Stagnation Temperature: Module Tube | 374°F (190°C) 529°F (276°C) | 374°F (190°C) 529°F (276°C) |
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