Absorber arrangement for a trough collector

Abstract

The invention relates to an elongated absorber arrangement for a trough collector, which is subjected to concentrated radiation over its length during operation, and which has means for transporting heat-transporting fluid through the absorber arrangement. The absorber arrangement has at least one fluid-free absorber space for concentrated radiation, which has a thermal opening leading into its interior and walls for absorption of the heat incident into it. The means for transporting the fluid have a supply arrangement and a drain arrangement which are operatively connected to one another by means of a heat-exchanger arrangement through which fluid flows, wherein the same extends along the length of the absorber arrangement, is constructed for the throughflow of the fluid in transverse flow for the length of the absorber arrangement and is thermally connected to the at least one absorber space in such a manner that the fluid is heated during operation in transverse flow from an inlet temperature to the operating temperature and reaches the drain arrangement at this temperature.

1 . An elongated absorber arrangement for a trough collector, which is subjected to concentrated radiation over its length during operation, with means for transporting heat-transporting fluid through the absorber arrangement, the absorber arrangement comprising:
 at least one fluid-free absorber space for concentrated radiation which has a thermal opening leading into its interior and walls for absorption of the heat incident into it, and the means for transporting the fluid have a supply arrangement and a drain arrangement which are operatively connected to one another by means of a heat-exchanger arrangement through which fluid flows; and   wherein the same extends along the length of the absorber arrangement, is constructed for the throughflow of the fluid in transverse flow for the length of the absorber arrangement and is thermally connected to the at least one absorber space in such a manner that the fluid is heated during operation in transverse flow from an inlet temperature T E  to the operating temperature T A  and reaches the drain arrangement at this temperature.   
     
     
         2 . The elongated absorber arrangement according to  claim 1 , wherein a number of absorber spaces lying one behind the other in a row are provided over the length of the absorber arrangement, which absorber spaces are directly adjacent to one another. 
     
     
         3 . The elongated absorber arrangement according to  claim 1 , wherein a number of absorber spaces lying one behind the other in a row are provided over the length of the absorber arrangement, which absorber spaces are arranged separated from one another at a distance from one another. 
     
     
         4 . The elongated absorber arrangement according to  claim 1 , wherein at least sections of the wall of the at least one absorber space are formed by the heat-exchanger arrangement. 
     
     
         5 . The elongated absorber arrangement according to  claim 1 , wherein the heat-exchanger arrangement has mutually adjacent line sections for the fluid, which form at least one wall section for the at least one absorber space. 
     
     
         6 . The elongated absorber arrangement according to  claim 2 , wherein an absorber space is formed by a line of the heat-exchanger arrangement, which run in mutually adjacent windings and thus preferably completely envelop the interior of the absorber space. 
     
     
         7 . The elongated absorber arrangement according to  claim 1 , wherein the drain arrangement has a collecting line, extending over the length of the absorber arrangement, for heated fluid supplied to it over its length from the heat-exchanger arrangement, wherein the collecting line is thermally insulated over its length through to the openings for the supply of the heated fluid. 
     
     
         8 . The elongated absorber arrangement according to  claim 1 , wherein the supply arrangement has a feed line for the fluid to be heated and supplied to the heat-exchanger arrangement over its length, which feed line extends over the length of the absorber arrangement, wherein the feed line is thermally insulated over its length through to the openings for the supply of the heated fluid. 
     
     
         9 . The elongated absorber arrangement according to  claim 1 , wherein the supply arrangement and the drain arrangement have a supply pipe and a drain pipe, wherein the pipes run parallel to one another and the at least one absorber space is arranged between such pipes and preferably extends over the entire length of the absorber arrangement. 
     
     
         10 . The elongated absorber arrangement according to  claim 1 , wherein the supply arrangement and the drain arrangement have a supply pipe and a drain pipe, wherein the pipes run parallel to one another and a number of absorber spaces is provided, which are arranged in at least one row running between such pipes, wherein the at least one row preferably extends over the entire length of the pipes. 
     
     
         11 . The elongated absorber arrangement according to  claim 1 , wherein a plurality of absorber spaces are provided, which are connected parallel between the supply and the drain arrangements. 
     
     
         12 . The elongated absorber arrangement according to  claim 1 , wherein the supply arrangement has a supply pipe which is segmented and wherein each segment has a connection for a source of heat-transporting fluid. 
     
     
         13 . The elongated absorber arrangement according to  claim 1 , wherein the length thereof is greater than 100 m, preferably greater than 150 m and particularly preferably 200 m or more. 
     
     
         14 . The elongated absorber arrangement according to  claim 1 , wherein secondary concentrators are provided, which concentrate the incident radiation in the longitudinal direction of the absorber arrangement upstream of the at least one absorber space.