Thermally-insulated tubular-tower solar receiver comprising a system for reduce energy losses

Abstract

The invention relates to different elements for increasing the yield of tubular-tower solar receivers, reducing losses through radiation. The term tubular receiver is used to mean receivers that use a heat-transfer fluid of the liquid or liquid/vapour mix type, which flows through generally circular ducts or tubes acting as an absorber, in which the heat-transfer fluid can be any fluid having physical properties suitable for the working conditions of the receiver (water, oils, molten salts and others).

1 - 14 . (canceled) 
     
     
         15 . A thermally-insulated tubular-tower solar receiver comprising a system for reduce energy losses, used in solar tower power plants which are devised to concentrate solar energy onto a receiver by means of the strategic placement of heliostats, and transform it into high temperature thermal energy contained in tubes and/or conduits through which a heat-transfer fluid circulates, being heated by the solar radiation concentrated by the aforementioned heliostats, wherein the receiver has a least one of the following elements
 a visor,   a bundle of tubes, wherein the tubes are placed horizontally or vertically in said bundle aligned in two or more rows or columns.   
     
     
         16 . The thermally-insulated tubular-tower solar receiver comprising a system for reduce energy losses, according to  claim 15  wherein these elements are applied to a receiver of a circular type solar tower power plant. 
     
     
         17 . The thermally-insulated tubular-tower solar receiver comprising a system for reduce energy losses, according to  claim 15  wherein these elements are applied to a receiver of a non-circular type solar tower power plant. 
     
     
         18 . The thermally-insulated tubular-tower solar receiver comprising a system for reduce energy losses, according to  claim 15 , wherein a visor is added on the upper part of the receiver. 
     
     
         19 . The thermally-insulated tubular-tower solar receiver comprising a system for reduce energy losses, according to  claim 15  wherein the tubes of the bundle meet with at least one of the following specifications.
 1. The tubes are composed of different selective materials at the from and rear with regard to the incidence of the solar radiation. 
 2. The tubes are joined together with fins.