Solar collector and method for manufacturing such a solar collector

Abstract

A solar collector is provided having an absorber ( 100 ), which has a front side ( 102 ) facing toward the solar radiation during use and a back side ( 103 ) facing away from the solar radiation during use, a transparent cover ( 200 ) arranged essentially plane-parallel opposite the front side ( 102 ) of the absorber ( 100 ), and a back wall ( 300 ) arranged opposite the back side ( 103 ) of the absorber ( 100 ). The solar collector distinguishes itself in that the back wall ( 300 ) is constructed as a transparent pane, in particular a glass pane or plastic pane, and contains, at least in some regions, a medium which reflects infrared radiation and is reflective in the direction of the back side ( 103 ) of the absorber ( 100 ). Further, a composite pane is provided, in particular a composite glass pane ( 1 ), an absorber ( 100 ), and a use of such an absorber ( 100 ) in solar collectors and composite panes. This absorber can also have a coating for the reduction of heat emission (low-e).

1 .- 18 . (canceled) 
     
     
         19 . A solar collector comprising an absorber having a front side facing toward solar radiation during use and a back side facing away from the solar radiation during use, a transparent cover arranged essentially plane-parallel opposite the front side of the absorber, and a medium which reflects infrared radiation and is reflective toward the absorber, wherein the medium is allocated to the back side of the absorber. 
     
     
         20 . The solar collector according to  claim 19 , wherein the medium reflecting infrared radiation comprises at least one of a coating reflecting infrared radiation and additives reflecting infrared radiation. 
     
     
         21 . The solar collector according to  claim 19 , further comprising a back wall arranged opposite the back side of the absorber. 
     
     
         22 . The solar collector according to  claim 21 , wherein the back wall comprises a transparent pane, optionally a glass pane or plastic pane, and at least in some regions comprises the medium reflecting infrared radiation. 
     
     
         23 . The solar collector according to  claim 21 , wherein the cover and the back wall each comprise glass, optionally a glass pane, which forms an outer boundary of the solar collector. 
     
     
         24 . The solar collector according to  claims 21 , wherein at least one of the cover and the back wall, optionally the medium reflecting infrared radiation, comprises a heat-insulating glass. 
     
     
         25 . The solar collector according to  claim 21 , comprising a composite glass construction having a sandwich configuration, wherein the absorber is arranged between two glass panes, which form the cover and the back wall, respectively. 
     
     
         26 . The solar collector according to  claim 21 , wherein the medium reflecting infrared radiation comprises pigment-like bodies, optionally glass beads, arranged on a side of the back wall facing toward the back side of the absorber. 
     
     
         27 . The solar collector according to  claim 21 , wherein the cover and the back wall are arranged spaced from the absorber and are connected by a frame. 
     
     
         28 . The solar collector according to  claim 21 , comprising a pane interspace between the cover and the back wall, the pane interspace being closed gas-tight relative to its surroundings. 
     
     
         29 . The solar collector according to  claim 21 , wherein the solar collector has a form of a composite glass pane having two glass panes arranged on an the outside and the absorber in the inside. 
     
     
         30 . The solar collector according to  claim 29 , wherein the two glass panes form the cover and the back wall, respectively. 
     
     
         31 . The solar collector according to  claim 29 , wherein surfaces of the two glass panes facing toward the absorber comprise, at least in some sections, the medium reflecting infrared radiation. 
     
     
         32 . The solar collector according to  claim 19 , wherein the solar collector has a construction of a flat collector or tube collector, wherein a first glass region is on a side of the solar collector facing toward the solar radiation as a solar glass pane, and a second glass region is on a side of the solar collector facing away from the solar radiation as heat-insulating glass. 
     
     
         33 . A composite pane comprising a frame connecting at least two transparent panes, optionally glass panes, spaced from each other and arranged plane-parallel to each other in a gas-tight manner, wherein the transparent panes each have a medium reflecting infrared radiation inward, and wherein at least one absorber for solar energy is arranged between the transparent panes. 
     
     
         34 . An absorber comprising a front side, a back side, and at least one fluid channel for a heat-exchange medium, the channel being arranged between the front side and the back side, wherein the back side has, at least in some regions, a medium reflecting infrared radiation in a direction of the fluid channel. 
     
     
         35 . The absorber according to  claim 34 , wherein the medium reflecting infrared radiation comprises a coating which reflects infrared radiation. 
     
     
         36 . The absorber according to  claim 34 , wherein the front side has, at least in some regions, a coating absorbing infrared radiation. 
     
     
         37 . A solar collector comprising the absorber according to  claim 34 . 
     
     
         38 . A composite pane comprising the absorber according to  claim 34 .