A solar heat collection apparatus heats a heating medium flowing through a heat collecting tube by collecting sunlight in the heat collecting tube using a curved surface mirror. The heat collecting tube includes an inner tube through which the heating medium flows, an outer tube provided on an outer side of the inner tube, and a bellows, a flange, and a cylinder member connecting the inner tube to the outer tube. An insulating space is formed between the inner tube and the outer tube, and an exhaust hole that communicates with the insulating space is formed in the flange. The exhaust hole is sealed by a sealing member welded to the flange. As a result, damage to the outer tube can be prevented, and heat collecting tubes can be more easily connected to each other in the lengthwise direction.

In a solar generator, comprising a reflector and an electrohydraulic sun-position tracking device with at least one hydraulic cylinder and a hydraulic control seat valve, the reflector can be guided via the control seat valve to follow in synchronism with the course of the sun continuously and uninterruptedly. The control seat valve for regulating a pressure medium flow permanently supplied to the hydraulic cylinder comprises a seat surface and a sealing surface permanently pressed against each other with variable contact pressure, with which the pressure medium flow can be generated as controlled leakage. The sealing surface is made of a material that can be deformed by contact pressure. In the control seat valve, the controlled leakage is set in a control position at least substantially without lifting movement exclusively by the relative material deformation of the sealing surface on the seat surface, which deformation is set via the contact pressure.

Broadband reflectors include a UV-reflective multilayer optical film and a VIS/IR-reflective layer. In various embodiments, the VIS/IR reflective layer may be a reflective metal layer or a multilayer optical film. Concentrated solar power systems and methods of harnessing solar energy using the broadband reflectors and optionally comprising a celestial tracking mechanism are also disclosed.

A solar heat boiler is provided which is capable of avoiding damage to heat transfer tubes without increasing facility cost and construction cost. The solar heat boiler includes: a low-temperature heating device by which water supplied from a water supply pump is heated by heat of sunlight; a steam-water separation device by which two-phase fluid of water and steam generated in the low-temperature heating device is separated into water and steam; a high-temperature heating device by which the steam separated by the steam-water separation device is heated by the heat of sunlight; and a circulation pump by which the water separated by the steam-water separation device is supplied to the low-temperature heating device.

The present invention discloses a compact solar concentrator module and array preferably with cooling and heat extraction system for converting solar energy to other energy forms preferably electric and thermal energies. The solar concentrator module comprises a vacant structure with a substantially reflective parabolic inside surface, as well as a focal device disposed within the vacant structure for receiving a solar energy converter or a solar cell preferably photovoltaic cell. the focal device being positioned proximate to the focal point of the reflective parabolic inside surface, and a transparent cover coupled to the vacant structure opposing to the reflective parabolic inside surface for transmitting sunlight therein.

A receiver system for a Fresnel solar plant is provided. The system includes an absorber tube defining a longitudinal direction and a mirror array that runs parallel to the longitudinal direction. The mirror array has a mirror-symmetrical curve profile having at least one top apex for concentrating light beams onto the absorber tube. The mirror array has ventilation holes in the region of the apex.

A solar collector apparatus includes a parabolic mirror configured to direct solar energy through a double convex lens and towards a linear set of secondary mirrors, each of the secondary mirrors positioned to direct the solar energy towards a solar collection target. The subsequent diversion achieved by the solar collector apparatus allows collection of solar energy several times denser than natural sunlight, and can be captured using a substantially compact system.

A solar concentrator has frame members connected together to form a framework, and a flexible sheet attached to the framework such that the flexible sheet takes a loose shape and can flex in response to shaping forces exerted thereon. The sheet has a reflective surface located between the frame members. A shaping force system is operative, when activated, to exert the shaping forces on the sheet, the shaping forces configured to draw the sheet from the loose shape into a desired shape such that solar rays striking the reflective surface are focused on a target, and a solar energy receiver is attached to the framework at a location corresponding to the target. Thin wall tubing filled with pressurized air can provide strong light frame members. When the shaping force system is deactivated, the flexible sheet reverts substantially to the loose shape.

Solar energy concentration systems and methods that includes a curved lower solar reflective dish, and a smaller curved solar concentrator located on a focal line above the dish. The dish reflects input light rays onto the smaller curved solar concentrator. Moveable supports adjusts the shape of the deformable solar concentrator mounted directly below the concentrator to receive concentrated light rays reflected from the concentrator. A controller for storing and executing a set of instruction controls the shape of the concentrator to focus the reflected concentrated light rays onto a focal collector. A mirror point list adjusts the shape of the concentrator based on a sun angle.

A vehicle and method for cleaning parabolic trough solar collectors (2) by means of a motorized vehicle (1) which includes a water tank (4); front (5) and rear (6) cleaning arms, with a telescopic part having several sections, coupled at one end to a pivoting head (8) which supports a rotary cleaning brush (9) and comprises spray nozzles (10), as well as proximity sensors (12) for the brushes (9). It comprises the same number of front and rear transverse guide rails (13) which include a linear movement means (14) coupled, by means of a pivot (15), to the cleaning arms (5, 6). The brushes (9) are movable in relation to the head (8) by means of a shaft (21) actuated by a retraction actuator (27) for overcoming obstacles (26).