The inner water tube is arranged in the internal absorber tube space.

The absorber tube: The absorber tube consists of two concentric tubes separated by a vacuum layer.

The secondary reconcentrator is obtained by partially mirror-coating the glass tube that maintains the vacuum in the absorber tube.

The invention relates to an absorber tube (1) comprising a central metal tube (2), a glass cladding tube (2), a glass cladding tube (4) and a glass-metal transition element (10).

Each tube contains a glass outer tube and metal absorber tube attached to a fin.

Each tube contains a glass outer tube and a metal absorber tube attached to a fin.

A radiant energy absorber (39) having an absorber tube (40) formed with V-shaped grooves (41) in its outer surface to enhance energy collection.

The vacuum tube is formed by an absorber tube containing a heat-transfer fluid and surrounded by a glass tube with an intermediate vacuum therebetween.

Radiation-permeable cladding tubes (15) are located between the supports and surround the absorber tube (13).

The invention relates to a solar collector comprising an absorber tube (13) supported by supports.

The invention relates to a method for introducing protective gas that is located in a container which is arranged in the evacuated annular space of an absorber tube between its outer sleeve tube and inner metal tube.

The wheel segment (2) is rotatably mounted about an absorber tube (3) of the parabolic trough collector (1), said absorber tube (3) running coaxially to the focal line.

A heat absorption plate (8) is tightly contacted with the heat absorbing surface of each heat absorbing tube (11).

To avoid the dispersion of the reflected light from the primary surface, and not the focusing on the absorber tube, a secondary reflective surface is placed above the absorber tube to re-concentrate the rays on it.

This system uses a series of specially designed ‘Trough’ collectors which have an absorber tube running along their length.