Coil solar receiver for a stirling disk and method for manufacturing same

Abstract

Coil solar receiver for a Stirling disk, the main components of which are pipes (where the sun hits), collectors, tanks and cupolas (of which there are two types, one that houses the regenerator, and the expansion cupola that is the area where the working gas is at a higher temperature) that includes a series of pipes ( 1 ) that perpendicularly exit from one collector ( 2 ) and perpendicularly enter another ( 2 ) and where each pipe consists of two semicircumferential curved parts ( 10 ) and three straight parts ( 11 ) parallel to one another: a center straight part (between curve and curve) and two straight parts on the ends (between the curve and the exit of one collector ( 2 )), the two straight end parts being located on the same plane, while the center straight part is located in a separate plane.

1 . Coil solar receiver for a Stirling disk the main components of which are pipes, which form the surface where the concentrated solar light beam hits, collectors, which are welded to the pipes and place the fluid that runs through the pipes in communication with the tanks, tanks, which are the internal areas of the collectors from which the working gas is distributed to each of the pipes and cupolas, of which there are two types, the one that houses the regenerator and the expansion cupola that is the area where the working gas is at a higher temperature wherein it comprises a series of pipes wherein each pipe has a design such that it emerges from the origin collector in a straight line towards the target collector and before reaching the target collector turns 180° going slightly down in height and comes back in a straight line, by a horizontal plane parallel and below the departure one, towards the origin collector and before reaching the origin collector it turns again according to a 180° curve going down a little more in height, heading again in a straight line by a horizontal plane parallel and below the target collector, where it enters perpendicular and is connected by welding. 
     
     
         2 . Coil solar receiver for a Stirling disk according to  claim 1  wherein the surfaces or plates where the collectors are welded are parallel to one another and perpendicular to the entrance of the pipes. 
     
     
         3 . Coil solar receiver for a Stirling disk according to  claim 1  wherein each pipe is arranged in such a way that the straight parts of the pipe form a surface without gaps between pipes and without shading of some parts over others. 
     
     
         4 . Coil solar receiver for a Stirling disk according to  claim 3  wherein it is formed by 28 pipes, each one of a length of approximately 800 mm. 
     
     
         5 . Coil solar receiver for a Stirling disk according to  claim 4  wherein the two 180° curves are semicircumferences with a radius of 11.1125 mm. and the straight parts are: the center between curve and curve of 220 mm and the ends between the curve and the exit of one collector of 255 mm, including the 3 mm of pipe that are introduced in the collector for welding. 
     
     
         6 . Coil solar receiver for a Stirling disk according to  claim 1  wherein the materials used are nickel-chromium-based alloys, as those marketed Inconel 625 or Multimet®. 
     
     
         7 . Coil solar receiver for a Stirling disk according to  claim 1  wherein the pipes to be used have an outside diameter of 3 mm, and a thickness of 0.5 mm and the collectors are made of a 3 mm plate. 
     
     
         8 . Coil solar receiver for a Stirling disk according to  claim 1  wherein there are two vertical rows of drill holes in each collector, in one row are welded all the pipes that have that collector as origin and in the parallel row are welded all the pipes that have that collector as target and the pipes of one and the other row do not come into contact. 
     
     
         9 . Coil solar receiver for a Stirling disk according to  claim 8  wherein each vertical row of the collector consists of 14 holes. 
     
     
         10 . Coil solar receiver for a Stirling disk according to  claim 8  wherein in each collector the distance between centres of pipes of the same vertical row is equal to six times the diameter of the pipe. 
     
     
         11 . Coil solar receiver for a Stirling disk according to  claim 1  wherein a sleeve or pipe segment is placed, by welding, sintering or other methods, on each of the pipes of the receiver in the area of connection with the collectors, serving as a transition between the two areas with different rigidity. 
     
     
         12 . Method for manufacturing the coil solar receiver for a Stirling disk described in  claim 1  comprising the following steps:
 Receiving the pipes 
 Bending of pipes 
 Assembly of pipes to collector with furnace welding 
 TIG Welding/plasma/laser for welding the tanks, made as junction of plates to the collectors 
 TIG Welding/plasma/laser for welding the cupolas, made from a block of material to the tanks.