Absorbing coating properties

Construction

Graded Al-N/Al solar selective absorbing coating

Method to deposition

DC reactive sputtering

Absorptance

>91%

 Emittance

<8%(80°C)

Vacuum

P<5X10-3Pa

Stagnation parameter

≥230M2°C/KW

Solar radiance exposure for obtaining a preset water temperature

≤2.8MJ/M2

Average heat loss coefficient

≤0.8W/(M2°C)