초록 ▼

An efficient solar collector includes an outer evacuated envelope having an upper transparent surface to admit light rays to the envelope and a tube extending in the envelope from one end towards the other for conveying fluid to be heated into the collector and for removing heated fluid from the col

An efficient solar collector includes an outer evacuated envelope having an upper transparent surface to admit light rays to the envelope and a tube extending in the envelope from one end towards the other for conveying fluid to be heated into the collector and for removing heated fluid from the collector. A selectively absorbing surface is provided on the tube for selectively absorbing energy having predetermined wavelengths and rejecting other wavelengths. An elongate reflector having a particular locus is located internally of the light and arranged to reflect light received through the transparent surface onto the tube at a concentration ratio which is the ratio of the transverse width of the upper transparent surface to the outer circumference of the tube. The locus of the reflector surface is the shape required to ensure that all incident rays received through the upper transparent surface within the acceptance angle qq

대표청구항 ▼

A solar collector comprising: an outer evacuated elongate envelope having an upper transparent surface to admit light rays to the envelope, a tube extending in the envelope from one end thereof towards the other for conveying fluid to be heated into the collector and for removing heated fluid from t

A solar collector comprising: an outer evacuated elongate envelope having an upper transparent surface to admit light rays to the envelope, a tube extending in the envelope from one end thereof towards the other for conveying fluid to be heated into the collector and for removing heated fluid from the collector, a selectively absorbing surface on said tube for selectively absorbing energy having predetermined wavelengths and rejecting other wavelengths, and an elongate reflector surface located internally of the envelope and arranged to reflect light received through the transparent surface onto said tube, said upper transparent surface and said tube being dimensioned to provide a concentration ratio which is the ratio of the transverse width of the upper transparent surface to the outer circumference of the tube and has a value from about 1 to about 50, said reflector surface having mirror image cross-sectional-shaped portions on either side of a vertical axis of the reflector surface each having a length required to ensure that no less than about 75% of the maximum efficiency of the collector is realized, said maximum efficiency being provided by the shape of said reflector surface required to ensure that all incident rays received into the envelope through the upper transparent surface within the acceptance angle qC=1/sin qq