Heat receiver tube with a diffusion barrier layer

摘要

A heat receiver tube (1) for absorbing solar energy and for transferring absorbed solar energy to a heat transfer fluid is described. The heat transfer fluid can be located inside a core tube (10) of the heat receiver tube. The core tube (10) of the heat receiver tube comprises a core tube surface (101) to which at least one optical function layer (13,14) is attached. Between the core tube surface (101) and the optical function layer (13,14) a diffusion barrier layer (12) is arranged such that a diffusion of a core tube material of the core tube (10) into the optical function layer (13,14) and/or a diffusion of an optical function layer material of the optical function layer (13,14) into core tube (10) are inhibited. By the diffusion barrier layer (12) a diffusion of a material of the adjacent layers through the diffusion barrier layer (12) is blocked.