Glass tube with infrared light reflective coating, method for manufacturing the glass tube, heat receiver tube with the glass tube, parabolic trough collector with the heat receiver tube and use of the parabolic trough collector

A heat receiver tube for absorbing solar energy and for transferring absorbed solar energy to a heat transfer fluid located inside a core tube of the heat receiver tube, wherein:

• the heat transfer fluid is a thermo-oil;
• the core tube comprises a core tube surface with a solar energy absorptive coating for absorbing solar absorption radiation of the sunlight;
• the core tube is enveloped by an encapsulation with a glass tube with a glass tube wall, wherein a space between the core tube and the encapsulation is evacuated;
• an inner surface of the glass tube wall comprises at least partially at least one infrared light reflective coating;
• the infrared light reflective coating includes a transparent conducting coating comprising indium tin oxide, wherein the transparent conducting coating is configured to permit solar absorption radiation to impinge the core tube, and wherein the transparent conducting coating is configured to capture infrared radiation radiating from the core tube and direct the infrared radiation back to the core tube;
• an intermediate layer of aluminum oxide arranged between the inner surface of the glass tube wall and the infrared light reflective coating;
• an additional layer of aluminum oxide or silicon oxide covering the infrared light reflective coating, wherein the additional layer is between the infrared light reflective coating and the solar energy absorptive coating such that the additional layer is adjacent to the infrared light reflective coating and the space;
• the core tube surface and the encapsulation are arranged in a distance between the core tube surface and the inner surface of the glass tube wall with the infrared reflective surface such, that the solar absorption radiation can penetrate the encapsulation with the infrared light reflective coating and can impinge the solar energy absorptive coating.