Solar thermal absorber element

Abstract

A solar thermal collector includes a solar thermal absorber element which includes a cover glass, a direct-flow absorber, a fore thermoplastic sealing for attaching the cover glass and absorber to each other leaving a distance (h 1 ) therebetween, and a fore sealed space, formed by the cover glass, absorber, and fore sealing. The fore space is filled up with a first low thermal conductive gas. The element further includes a back insulation part, a back thermoplastic sealing for attaching the insulation part and the absorber to each other leaving a distance (h 2 ) therebetween, and a back sealed space, formed by the insulation part, absorber, and back sealing. The back space is filled up with a second low thermal conductive gas. The element may include a TPS-direct-flow absorber-glass element, wherein the back glass insulation part is hermetically sealed with the TPS sealing and the back space is filled with the second gas.

1 . A solar thermal absorber element ( 100 ) comprising
 a cover glass ( 110 ),   a direct-flow absorber ( 120 ),   a fore thermoplastic sealing ( 130 ) for attaching the cover glass and the absorber to each other so that there is a distance (h 1 ) therebetween, and   a fore sealed space ( 134 ), which is formed by the cover glass, the absorber, and the fore sealing, and which is filled up with a first low thermal conductive gas ( 136 ),   wherein the element further comprises   a back insulation part ( 160 ),   a back thermoplastic sealing ( 170 ) for attaching the insulation part and the absorber to each other so that there is a distance (h 2 ) therebetween, and   a back sealed space ( 174 ), which is formed by the insulation part, the absorber, and the back sealing, and which is filled up with a second low thermal conductive gas ( 176 ).   
     
     
         2 . The element of  claim 1 , which further comprises a back secondary sealing ( 180 ), which is attached to the back sealing and between the insulation part and the absorber, the back secondary sealing is configured to protect the back sealing and to carry a weight of the absorber. 
     
     
         3 . The element of  claim 1 , wherein the insulation part is a glass, a polyurethane board, or a polyisocyanurate board. 
     
     
         4 . The element of  claim 1 , wherein the absorber is a roll-bond absorber ( 120 ) that comprises a highly selective vacuum coating ( 150 ) on its fore surface ( 122 ), the coating is configured to absorb light. 
     
     
         5 . The element of  claim 1 , wherein the second low thermal conductive gas is an argon gas. 
     
     
         6 . A solar thermal collector ( 190 ) comprising
 an absorber element ( 100 ) of  claim 1 , which comprises   a cover glass ( 110 ),   a direct-flow absorber ( 120 ),   a fore thermoplastic sealing ( 130 ) for attaching the cover glass and the absorber to each other so that there is a distance (h 1 ) therebetween,   a fore sealed space ( 134 ), which is formed by the cover glass, the absorber, and the fore sealing, and which is filled up with a first low thermal conductive gas ( 136 ),   a back insulation part ( 160 ),   a back thermoplastic sealing ( 170 ) for attaching the insulation part and the absorber to each other so that there is a distance (h 2 ) therebetween, and   a back sealed space ( 174 ), which is formed by the insulation part, the absorber, and the back sealing, and which is filled up with a second low thermal conductive gas ( 176 ).   
     
     
         7 . A method for manufacturing a solar thermal absorber element ( 100 ) of  claim 1 , which element comprises
 a cover glass ( 110 ),   a direct-flow absorber ( 120 ),   a fore and back thermoplastic sealings ( 130 ,  170 ),   a fore sealed space ( 134 ), and   a back insulation part ( 160 ),   the method comprises   attaching, by the fore sealing ( 130 ), the cover glass and the absorber to each other so that there is a distance (h 1 ) therebetween, whereupon the cover glass, the absorber, and the fore sealing form the fore space,   filling up the fore space with a first low thermal conductive gas ( 136 ),   attaching, by the back sealing ( 170 ), the insulation part and the absorber to each other so that there is a distance (h 2 ) therebetween, whereupon the insulation part, the absorber, and the back sealing form the back space, and   filling up the back space with a second low thermal conductive gas ( 176 ).