Patent ID: 9732989
Date: 2017-08-15
CPC Classifications: B21D,F24S,Y02E,Y10T

Claim:
1. A heat receiver tube for absorbing solar energy and for transferring the absorbed solar energy to a heat transfer fluid located inside a core tube of the heat receiver tube, comprising: a first partial heat receiver tube surface; a second partial heat receiver tube surface; and a further partial heat receiver tube surface, wherein the first partial heat receiver tube surface is formed by a first solar energy absorptive coating for absorbing a first absorption radiation of a first certain spectrum of a sunlight, wherein the first solar energy absorptive coating is deposited on a first partial core tube surface of the core tube, wherein the second partial heat receiver tube surface is formed by at least one emission radiation inhibiting coating for inhibiting an emissivity for infrared radiation, wherein the emission radiation inhibiting coating is deposited on a second core tube surface of the core tube, wherein the further partial heat receiver tube surface is formed by at least one further solar energy absorptive coating for absorbing a further absorption radiation of a further certain spectrum of the sunlight, wherein the further solar energy absorptive coating is deposited on a further partial core tube surface of the core tube, wherein the further partial heat receiver tube surface is arranged in a radiation window of the second partial heat receiver tube surface such that the further absorption radiation can impinge the further partial heat receiver tube surface, and wherein the first solar energy absorptive coating, the at least one emission radiation inhibiting coating, and the at least one further solar energy absorptive coating form a complete lateral core tube surface of the core tube.