Double-line focusing solar energy collection apparatus

A double line focusing solar energy collection apparatus, comprising:

• a heat collector comprising a primary concentrator and a heat collection tube, wherein the primary concentrator has a focus line;
• a secondary concentrator having a focus line;
• wherein a first opening of the primary concentrator is greater than a second opening of the secondary concentrator, and a first focal length of the primary concentrator is greater than a second focal length of the secondary concentrator, wherein a first ratio of the first opening to the first focal length is equal to a second ratio of the second opening to the second focal length;
• and
• a bracket supporting the primary concentrator, the heat collection tube, and the secondary concentrator, wherein the heat collection tube is located between the primary concentrator and the secondary concentrator and is located on focus lines of the secondary concentrator and the primary concentrator, wherein the primary concentrator is a Fresnel reflector, and the secondary concentrator is a Fresnel reflector,
• wherein the heat collection tube is a vacuum tube comprising an outer tube and an inner tube, an interval between the outer tube and the inner tube is vacuum, and the inner tube carries an energy absorbing medium, and wherein the outer tube is transparent, and the inner tube which is innermost in the heat collection tube is transparent.