Abstract: Provided are reflective thin film constructions including a reduced number of layers, which provides for increased solar-weighted hemispherical reflectance and durability. Reflective films include those comprising an ultraviolet absorbing abrasion resistant coating over a metal layer. Also provided are ultraviolet absorbing abrasion resistant coatings and methods for optimizing the ultraviolet absorption of an abrasion resistant coating. Reflective films disclosed herein are useful for solar reflecting, solar collecting, and solar concentrating applications, such as for the generation of electrical power.

Abstract: Provided are reflective thin film constructions including a reduced number of layers, which provides for increased solar-weighted hemispherical reflectance and durability. Reflective films include those comprising an ultraviolet absorbing abrasion resistant coating over a metal layer. Also provided are ultraviolet absorbing abrasion resistant coatings and methods for optimizing the ultraviolet absorption of an abrasion resistant coating. Reflective films disclosed herein are useful for solar reflecting, solar collecting, and solar concentrating applications, such as for the generation of electrical power.

Abstract: A rotational system is provided for controlling rotation of one or more solar collectors to track the movement of the sun, to automatically keep the collectors locked in stow position during high wind conditions, and advantageously also to prevent damage to the rotational system due to high pressures caused by high temperature conditions. The system utilizes a bi-directional hydraulic rotational actuator hydraulically connected to a control system. The actuator advantageously includes a system of helical gears and a piston, and the control system includes hydraulic lines equipped with check valves that prevent circulation of hydraulic fluid through the hydraulic lines and the actuator when backpressure is exerted in one of the hydraulic lines as a result of high wind force on the collectors. In addition, the control system advantageously comprises a pressure-relief system to prevent damage to the actuator during high temperature conditions.

Abstract: Provided herein are solar collectors having reflective sheets which are slidably insertable and/or removable for quick installation, construction, removal, repair, and/or replacement. Also provided are solar collectors having reflective sheets under tension. Further provided are methods for constructing solar collectors. In another aspect, provided herein are guide rails for guiding and/or retaining slidably removable reflective sheets and holding the reflective sheets in a prescribed shape.

Abstract: Provided are reflective thin film constructions including a reduced number of layers, which provides for increased solar-weighted hemispherical reflectance and durability. Reflective films include those comprising an ultraviolet absorbing abrasion resistant coating over a metal layer. Also provided are ultraviolet absorbing abrasion resistant coatings and methods for optimizing the ultraviolet absorption of an abrasion resistant coating. Reflective films disclosed herein are useful for solar reflecting, solar collecting, and solar concentrating applications, such as for the generation of electrical power.

Abstract: Solar/gas hybrid concentrating solar power (CSP) systems and methods of using the CSP systems are described. The hybrid CSP systems are highly efficient due, at least in part, to a solar segment comprising a first heat transfer fluid and a thermal storage segment comprising a second heat transfer fluid. The second heat transfer fluid heat exchanges with a steam segment to produce steam that drives a steam turbine. Thus, the solar and thermal segments perform the “heavy lifting” of producing steam from water. Once the steam is produced, it enters a superheater of the steam segment. The superheater, which does not heat exchange directly with the thermal storage segment, is heated by a gas turbine positioned downstream from the thermal storage segment.

Abstract: A space frame connector is provided for attaching an oblique strut tube to an axial chord of a space frame. The space frame connector includes a collar adapted to fit over an axial chord. The collar is equipped with one or more attachment flanges. The space frame connector also includes a strut tube having an extrusion flange formed in at least one of its ends. The extrusion flange is made up of two parallel leaves that define a slot between them. The slot is sized and shaped to fit over an attachment flange on the collar that is positioned over the axial chord. The extrusion flange can be formed using simple press and punch tools. Space frames used to support solar energy collector arrays can be assembled in the field, including formation of the extrusion flanges on the oblique strut tubes, or multiple strut tubes can be attached to axial chords and compactly packed and transported to the field for use in constructing space frames, for example for supporting large parabolic trough solar collectors.

Abstract: Provided herein are solar collectors having reflective sheets which are slidably insertable and/or removable for quick installation, construction, removal, repair, and/or replacement. Also provided are solar collectors having reflective sheets under tension. Further provided are methods for constructing solar collectors. In another aspect, provided herein are guide rails for guiding and/or retaining slidably removable reflective sheets and holding the reflective sheets in a prescribed shape.

Abstract: Provided herein are solar collectors having reflective sheets which are slidably insertable and/or removable for quick installation, construction, removal, repair, and/or replacement. Also provided are solar collectors having reflective sheets under tension. Further provided are methods for constructing solar collectors. In another aspect, provided herein are guide rails for guiding and/or retaining slidably removable reflective sheets and holding the reflective sheets in a prescribed shape.

Abstract: A rotational system is provided for controlling rotation of one or more solar collectors to track the movement of the sun, to automatically keep the collectors locked in stow position during high wind conditions, and advantageously also to prevent damage to the rotational system due to high pressures caused by high temperature conditions. The system utilizes a bi-directional hydraulic rotational actuator hydraulically connected to a control system. The actuator advantageously includes a system of helical gears and a piston, and the control system includes hydraulic lines equipped with check valves that prevent circulation of hydraulic fluid through the hydraulic lines and the actuator when backpressure is exerted in one of the hydraulic lines as a result of high wind force on the collectors. In addition, the control system advantageously comprises a pressure-relief system to prevent damage to the actuator during high temperature conditions.

Abstract: Provided herein are solar collectors having reflective sheets which are slidably insertable and/or removable for quick installation, construction, removal, repair, and/or replacement. Also provided are solar collectors having reflective sheets under tension. Further provided are methods for constructing solar collectors. In another aspect, provided herein are guide rails for guiding and/or retaining slidably removable reflective sheets and holding the reflective sheets in a prescribed shape.

Abstract: A space frame connector is provided for attaching an oblique strut tube to an axial chord of a space frame. The space frame connector includes a collar adapted to fit over an axial chord. The collar is equipped with one or more attachment flanges. The space frame connector also includes a strut tube having an extrusion flange formed in at least one of its ends. The extrusion flange is made up of two parallel leaves that define a slot between them. The slot is sized and shaped to fit over an attachment flange on the collar that is positioned over the axial chord. The extrusion flange can be formed using simple press and punch tools. Space frames used to support solar energy collector arrays can be assembled in the field, including formation of the extrusion flanges on the oblique strut tubes, or multiple strut tubes can be attached to axial chords and compactly packed and transported to the field for use in constructing space frames, for example for supporting large parabolic trough solar collectors.

Abstract: A solar concentrator of substantially parabolic shape is formed by preforming a sheet of highly reflective material into an arcuate section having opposed longitudinal edges and having a predetermined radius of curvature and applying a force to at least one of the opposed edges of the section to move the edges toward each other and into a predetermined substantially parabolic configuration and then supporting it.