Stretched Membrane Solar Collector

Abstract

An improved solar reflector utilizing a tensioned reflective membrane. The reflector structure includes a membrane attached on the outer surface of a metal strap that is positioned on an end form by means of a curved-face tensioning block.

1 . A solar reflector comprising:
 a support structure;   a first form member attached to said support structure defining a first periphery and a second form member defining a second periphery;   a tensioned reflective membrane having a first edge held adjacent to the first periphery and a second edge held adjacent to the second periphery;   a flexible strap defining a first end and a second end and having an inner surface and a outer surface, wherein the membrane is adhered to the outer surface of the strap near the first edge of the membrane; and   a first fastener;   wherein the first fastener attaches the first end of the flexible strap to the first form member, the inner surface of the strap is positioned to be adjacent to the first periphery, and the strap lies along the first periphery.   
     
     
         2 . The solar reflector of  claim 1  further comprising:
 a first tensioning block attached near the first end of the strap, wherein the first tensioning block defines a curved inner surface and a first opening adapted to receive the first fastener, the strap defines a first opening near the first end adapted to receive the first fastener, and the membrane defines a first opening near the first edge adapted to receive the first fastener; 
 and wherein the curved inner surface of the first tensioning block is positioned adjacent to the first edge of the membrane, the first fastener is inserted through the first opening in the first tensioning block, the first opening in the first edge of the membrane, and the first opening in the strap, and is attached to the first periphery. 
 
     
     
         3 . The solar reflector of  claim 1  wherein the first edge of membrane is wrapped around the strap and is adhered to the inner surface of the strap. 
     
     
         4 . The solar reflector of  claim 3  wherein the first edge of the membrane forms cutouts. 
     
     
         5 . The solar reflector of  claim 2  wherein the first opening in the first tensioning block is a slot defining a longitudinal axis, the opening in the strap is a slot, and the opening in the membrane is a slot, and the first tensioning block further comprises:
 a tensioning screw, and 
 a load transfer spacer, 
 and the first tensioning block further defines a second opening, adapted to receive the tensioning screw, wherein the second opening intersects with the slot and the tensioning screw is substantially parallel to the longitudinal axis of the slot when the tensioning screw is inserted into the second opening; 
 and wherein the load transfer spacer is positioned on the first fastener and within the slot in the tension block, whereby the tensioning screw may be tightened against the load transfer spacer to adjust tension of the strap and the membrane. 
 
     
     
         6 . The solar reflector of  claim 5  wherein the first edge of membrane is wrapped around the strap and is adhered to the inner surface of the strap. 
     
     
         7 . The solar reflector of  claim 6  wherein the first edge of the membrane forms cutouts. 
     
     
         8 . The solar reflector of  claim 1  wherein a resilient pad is placed between the strap and the first periphery. 
     
     
         9 . The solar reflector of  claim 2  further comprising:
 a second fastener; 
 a second tensioning block attached near the second end of the strap, wherein the second tensioning block defines a curved inner surface and an opening adapted to receive the second fastener, the strap defines a second opening near the second end adapted to receive the second fastener, and the membrane defines an second opening near the first edge adapted to receive the second fastener; 
 and wherein the curved inner surface of the second tensioning block is positioned adjacent to the first edge of the membrane, the second fastener is inserted through the opening in the second tensioning block, the second opening in the first edge of the membrane, and the second opening in the strap, and is attached to the first periphery. 
 
     
     
         10 . The solar reflector of  claim 1  further comprising:
 a first tensioning block attached near the first end of the strap, wherein the first tensioning block defines a inner surface and a first opening adapted to receive the first fastener, the strap defines a first opening near the first end adapted to receive the first fastener, and the membrane defines a first opening near the first edge adapted to receive the first fastener; 
 and wherein the inner surface of the first tensioning block is positioned adjacent to the first edge of the membrane, the first fastener is inserted through the first opening in the first tensioning block, the first opening in the first edge of the membrane, and the first opening in the strap, and is attached to the first periphery. 
 
     
     
         11 . A solar reflector comprising:
 a support structure;   a first form member attached to said support structure defining a first periphery and a second form member defining a second periphery;   a tensioned reflective membrane having a first edge held adjacent to the first periphery and a second edge held adjacent to the second periphery;   a flexible strap defining a first end and a second end, wherein the membrane is adhered to the strap near the first edge of the membrane; and   a first fastener;   wherein the first fastener attaches the first end of the flexible strap to the first form member, the inner surface of the strap is positioned to be adjacent to the first periphery, and the strap lies along the first periphery;   a first tensioning block attached near the first end of the strap, wherein the first tensioning block defines a curved inner surface and a first opening adapted to receive the first fastener, the strap defines a first opening near the first end adapted to receive the first fastener, and the membrane defines a first opening near the first edge adapted to receive the first fastener;   and wherein the curved inner surface of the first tensioning block is positioned adjacent to the strap and the first fastener is inserted through the first opening in the first tensioning block, the first opening in the first edge of the membrane, and the first opening in the strap, and is attached to the first periphery.   
     
     
         12 . A solar reflector comprising:
 a support structure;   a first form member attached to said support structure defining a first periphery and a second form member defining a second periphery;   a tensioned reflective membrane having a first edge held adjacent to the first periphery and a second edge held adjacent to the second periphery;   a flexible strap defining a first end and a second end and having an inner surface and a outer surface, wherein the membrane is adhered to the outer surface and to the inner surface of the strap near the first edge of the membrane and wherein the first edge of the membrane forms cutouts, and   a first fastener;   wherein the first fastener attaches the first end of the flexible strap to the first form member, the inner surface of the strap is positioned to be adjacent to the first periphery, and the strap lies along the first periphery.