Heat Receiver Tube With Metallic Sealing

A method for manufacturing a heat receiver tube, the method comprising:

• arranging a core tube and an enveloping tube coaxially such that an inner heat receiver tube space is bordered by the core tube surface and the inner enveloping tube surface;
• arranging an inlet port in a heat receiver tube skirt wall;
• adding an inert gas into the inner heat receiver tube;
• and
• sealing the inlet port.

A solar collector comprising:

• a mirror with a solar radiation reflecting surface directing solar radiation to a focal line of the solar radiation reflecting surface;
• and
• a heat receiver tube arranged in the focal line of the solar radiation reflecting mirror surface, the heat receiver tube comprising:
• a core tube comprising a core tube surface with a solar energy absorptive coating for absorbing solar radiation, the heat transfer fluid at least partially inside the core tube;
• an enveloping tube surrounding the core tube, the enveloping tube including an enveloping tube wall at least partly transparent for the solar radiation, wherein the enveloping tube wall comprises an inner enveloping tube surface;
• wherein the core tube and the enveloping tube are coaxially arranged such that an inner heat receiver tube space is bordered by the core tube surface and the inner enveloping tube surface;
• an inert gas in the inner heat receiver tube space;
• and
• a dimension adapting device having a flexible adapting device wall compensating for thermally induced change a dimension of the heat receiver tube;
• wherein the enveloping tube and the dimension adapting device are joined together by a skirt with a skirt wall having an inlet port for introducing the inert gas into the inner heat receiver tube space;
• wherein the inlet port is sealed by an inlet port sealing with a metal.