Abstract: A heat receiver tube for absorbing solar energy and for transferring absorbed solar energy to a heat transfer fluid which can be located inside of at least one core tube of the heat receiver tube is provided. The core tube includes a core tube surface with at least one solar energy absorptive coating for absorbing solar radiation. The core tube is enveloped by at least one enveloping tube. The enveloping tube includes at least one enveloping tube wall which is at least partly transparent for the solar radiation. The enveloping tube wall includes at least one inner enveloping tube surface. The core tube and the enveloping tube are coaxially arranged to each other such that an inner heat receiver tube space is formed which is bordered by the core tube surface (and the inner enveloping tube surface.

Abstract: A heat receiver tube for absorbing solar energy and for transferring absorbed solar energy to a heat transfer fluid may include: a core tube with a solar energy absorptive coating for absorbing solar radiation, the heat transfer fluid at least partially inside the core tube; and an enveloping tube surrounding the core tube, the enveloping tube including an inner enveloping tube surface. The core tube and the enveloping tube are coaxially arranged forming an inner heat receiver tube space. There is an inert gas in the inner heat receiver tube space. The tube may further include a dimension adapting device having a flexible adapting device wall compensating for thermally induced changes in a dimension of the tube. The enveloping tube and the dimension adapting device are joined together by a skirt having an inlet port for the inert gas. The inlet port is sealed with a metal.

Abstract: A heat receiver tube for absorbing solar energy and for transferring absorbed solar energy to a heat transfer fluid which can be located inside of at least one core tube of the heat receiver tube is provided. The core tube includes a core tube surface with at least one solar energy absorptive coating for absorbing solar radiation. The core tube is enveloped by at least one enveloping tube. The enveloping tube includes at least one enveloping tube wall which is at least partly transparent for the solar radiation. The enveloping tube wall includes at least one inner enveloping tube surface. The core tube and the enveloping tube are coaxially arranged to each other such that an inner heat receiver tube space is formed which is bordered by the core tube surface (and the inner enveloping tube surface.

Abstract: A heat receiver tube for absorbing solar energy and for transferring absorbed solar energy to a heat transfer fluid which can be located inside of at least one core tube of the heat receiver tube is provided. The core tube includes a core tube surface with at least one solar energy absorptive coating for absorbing solar radiation. The core tube is enveloped by at least one enveloping tube. The enveloping tube includes at least one enveloping tube wall which is at least partly transparent for the solar radiation. The enveloping tube wall includes at least one inner enveloping tube surface. The core tube and the enveloping tube are coaxially arranged to each other such that an inner heat receiver tube space is formed which is bordered by the core tube surface and the inner enveloping tube surface.

Abstract: A method for automatically assembling a solar field is provided with following steps: a) Providing at least one solar collector unit with a radiation concentrator collector including a radiation absorber with an absorber tube for a flow-through of a heat transfer medium and a parabolic mirror for focusing solar radiation onto the absorber tube of the radiation absorber for heating up the heat transfer medium flowing through the absorber tube; b) Transporting the solar unit to a target location of the solar field; and c) Assembling the solar unit on the target location of the solar field. Additionally a solar field with a plurality of prefabricated solar collector units is provided.