Free-Hanging Parabolic Trough Reflectors for Low-Stress Sun Tracking
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Solution Overview
Problem
Parabolic trough reflector systems face issues with land area utilization, mechanical stress, and wind-induced damage due to their fixed orientation, leading to high costs and reduced reliability, while existing technologies are not adaptable for Vertical Axis Trough Reflector (VATR) systems.
Innovation Solution
The design and fabrication of flexible rectangular sheets supported along two opposing edges to form parabolic troughs through distributed gravitational forces, using a three-step process involving sheet fabrication, support structure alignment, and mass distribution to achieve predetermined geometrical characteristics, allowing for efficient land use and reduced mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If parabolic trough reflectors are permanently oriented in a fixed direction (TTR systems), then the structure is simple and easy to manufacture, but land area utilization is poor (less than 30%) and mechanical stress from wind and sun-tracking is severe
Solution Approach 1:
The patent transitions from fixed-orientation TTR systems to rotatable VATR systems where the entire array can rotate to face the sun. This dynamic reconfiguration allows reflectors to be positioned side-by-side without mutual shadowing, improving land utilization from less than 30% to over 80% while maintaining structural simplicity
Solution Approach 2:
The rotatable platform serves multiple functions: it enables sun-tracking by rotating the entire array, allows wind-mitigation by reorienting reflectors parallel to wind direction, and improves land utilization by permitting side-by-side positioning. This multi-functionality resolves the contradiction between structural simplicity and land efficiency
2Adaptability or versatility
If parabolic trough reflectors tilt to track the sun (TTR systems), then sun-tracking is achieved, but severe bending and torsional stresses are imposed on support structures and reliability decreases
Solution Approach 1:
Instead of individual reflectors tilting on complex mechanical joints, the entire array rotates as a rigid unit on a stable platform. This dynamic approach achieves sun-tracking while eliminating severe bending and torsional stresses on support structures, significantly improving reliability
Solution Approach 2:
The patent merges the sun-tracking function into the platform rotation rather than requiring individual reflector articulation. By combining multiple reflectors into a unified rotatable array, the system achieves tracking capability while simplifying support structure requirements and enhancing reliability
3Device complexity
If parabolic trough reflectors are permanently oriented in a fixed direction, then structural design is simplified, but wind-induced stresses are severe when winds blow crosswise to the longitudinal axes
Solution Approach 1:
The rotatable platform enables the array to dynamically reorient itself relative to wind direction. When strong winds are detected, the system can rotate reflectors to face parallel to the wind, minimizing wind-induced stresses while maintaining simple structural design
Solution Approach 2:
The system incorporates preliminary wind-mitigation capability by pre-planning the ability to reorient reflectors parallel to wind direction before extreme winds occur. This proactive reconfiguration prevents severe wind-induced stresses while keeping the structural design relatively simple
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the creation of high-quality, low-cost, and reliable parabolic trough reflectors and support structures for VATR systems, improving land utilization and reducing mechanical stress, thus facilitating commercial deployment.
Implementation Method 1
flexible rectangular sheets that are supported along two opposing edges and thereby elastically deformed into parabolic troughs through the action of the distributed gravitational forces arising from their own weight
Implementation Method 2
flexible rectangular sheets that are supported along two opposing edges and thereby elastically deformed into parabolic troughs
Data Source
AI summary
A parabolic trough reflector assembly consists of (1) a free-hanging, flexible rectangular sheet that is highly reflective of solar radiation and (2) support hardware which critically supports the reflecting sheet at two opposing edges. Methods are disclosed for providing linear dimensions and edge slopes for the reflecting sheet that are consistent with a parabolic trough having specific predetermined dimensions and a predetermined focal length. Methods are disclosed for providing uniform loading for a reflecting sheet when it is critically supported as a free-hanging element. The methods involve tapering the thickness of a sheet, applying variable-thickness coatings to a sheet of uniform thickness, or fabricating discreet thickness variations into a sheet of otherwise uniform thickness.