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- Ritter - Evacuated Tubes (ET)
Ritter - Evacuated Tubes (ET)
Key component of the forced circulation systems (collectors) and thermosiphons. Coating material SS-AL/N/Cu or SS-AL/N/Cu. Scope of delivery Evacuated tubes are packed in boxes.
- Absorbance rate after coating (AM 1.5) α% ≥94.5
- Absorbance rate after evacuating (AM 1.5) α% ≥93.5
- Emission rate after coating (80±5°C) α% ≤6
- Emission rate after evacuating (80±5°C) α% ≤6.5
- Stagnation parameter m²°C/Kw ≥240
- Solar radiance exposure Btu/ft² ≤265
- Average heat loss coefficient Btu/h.ft².°F ≤0.1234
- Selective coating material SS-AL-N/Cu, SS-AL-N/Cu
- Impact resistance Steel Ball Test: Steel ball with diameter of 1.2" fall on the evacuated tube vertically from 1.5` height.
- Vacuum Degree Pa ≤3x10(-3)
- Pressure MPa 0.6
- Transparent (AM 1.5) ≥0.89 (ISO9806-1: 1994)