Patent ID: 7607428

Claim:
A solar absorber equipped with an absorber body ( 10 ), wherein said absorber body ( 10 ) has a side oriented toward a concentrator ( 13 ) that concentrates and focuses incident solar energy ( 12 ) on the absorber body ( 10 ) and an opposite side ( 38 ) oriented away from the concentrator ( 13 ); wherein a selective absorption layer ( 17 ) is provided on said side ( 36 ) of the absorber body oriented toward the concentrator ( 13 ) and another selective absorption layer ( 18 ) is provided on said opposite side ( 38 ) of the absorber body oriented away from the concentrator ( 13 ); wherein said selective absorption layer ( 17 ) on said side ( 36 ) oriented toward the concentrator ( 13 ) has a threshold wavelength below which solar radiation is absorbed and above which a reradiation capacity of the absorber body is suppressed by the selective absorption layer ( 17 ); wherein said another selective absorption layer ( 18 ) on said opposite side ( 38 ) facing away from the concentrator ( 13 ) has another threshold wavelength below which said solar radiation is absorbed and above which said reradiation capacity of the absorber body is suppressed by said another selective absorption layer ( 18 ); and wherein said threshold wavelength of said selective absorption layer ( 17 ) is greater than said another threshold wavelength of said another selective absorption layer ( 18 ).