The progress and prospect of middle/high temperature evacuated tubular solar collector

摘要

The all-glass evacuated solar collection tubes, incorporating the dc sputtered double layer metal-aluminium nitride cermet selective surface, have been mass-produced by TurboSun in large quantities under license to the University of Sydney since 1995. A solar absorptance of 0.94-0.95 and emittance of 0.04-0.05 at room temperature has been achieved for the SS-AIN cermet solar coatings. These solar tubes are stable at 330-400 deg. C. These M-AIN cermet tubes have widespread application for solar hot water and steam heaters, as well s the demonstration test units for solar thermal electricity.