... , CCC, CE; 3. Competitive price; 4,SOLAR KEYMARK, SRCC certificate Features: 1) Working principle of ... vacuum tube, from the high-temperature environment super-conduction tubes, leads the heat to the ... AL of sputter aluminum nitrogen aluminum alternative absorption coating solar radiation absorption rate ≥93%, and hot emittance ≤ ... Hail resistance: 25mm heat pipe solar collector with aluminum mainfold