Helical Structural Frame for CSP Reflector Torsion Control
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Solution Overview
Problem
Concentrating Solar Power (CSP) systems face challenges in maintaining structural integrity and efficiency due to high temperature and wind loading, which cause torsional and bending stresses, leading to potential deflection and reduced energy collection performance.
Innovation Solution
A three-dimensional structural frame design with primary polygonal shapes and axial frame members forming helical torque transfer paths, combined with a reflector system, provides enhanced torsional and bending stiffness while utilizing materials efficiently, and simplifies assembly and logistics through the use of identical frame members and hubs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional frame or truss system is used to support the reflector, then the module can be assembled and supported, but the frame becomes heavy and complex, increasing material costs and reducing ease of assembly
Solution Approach 1:
The frame is segmented into discrete modular units, each comprising a reflector supported by a localized truss structure. These modular units are connected through coupling mechanisms, allowing the overall frame to achieve required stiffness through modular assembly rather than a single complex continuous structure. This segmentation reduces manufacturing complexity and facilitates easier assembly while maintaining structural integrity.
Solution Approach 2:
The frame structure employs composite construction combining lightweight materials with strategic reinforcement elements. The truss members use material compositions that provide high strength-to-weight ratios, and the coupling mechanisms incorporate specialized materials that provide both mechanical connection and thermal expansion accommodation. This composite approach achieves the required torsional and bending stiffness without excessive weight or complexity.
2Reliability
If the frame is designed to withstand large torques from wind loading, then structural reliability is improved, but the frame weight increases
Solution Approach 1:
The frame design incorporates counterbalancing structural elements that distribute wind-induced torques more evenly throughout the structure. The modular truss units are configured with opposing members that create internal force couples, effectively counteracting external wind loads. This reduces the peak stresses on individual members, allowing the use of lighter materials while maintaining reliability under wind loading conditions.
Solution Approach 2:
The frame structure incorporates dynamic characteristics that allow it to respond to wind loading in a controlled manner. The modular design with articulated couplings enables the frame to flex and redistribute loads dynamically rather than relying solely on static rigidity. This dynamic response capability maintains structural integrity under varying wind conditions while reducing the overall weight required compared to a purely rigid design.
3Manufacturing precision
If precise fabrication is used to couple optically-precise devices, then energy collection accuracy is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The coupling mechanisms between modular frame units incorporate self-aligning features that automatically compensate for minor fabrication tolerances. The truss structures include built-in adjustment mechanisms that allow field assembly without requiring high-precision machining. These self-service features maintain the optically-precise alignment needed for energy collection while significantly simplifying the manufacturing and assembly processes.
4Stability of the object's composition
If a rigid frame structure is used to maintain alignment, then deflection is reduced, but the frame becomes more susceptible to thermal expansion issues
Solution Approach 1:
The frame design explicitly incorporates thermal expansion considerations into the modular coupling mechanisms. Each truss unit includes expansion joints and adjustable connection points that accommodate thermal growth and contraction of the structure. The modular architecture allows different sections to expand and contract independently while maintaining overall alignment stability, resolving the conflict between rigidity and thermal adaptability.
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
The design effectively transmits torque with minimal deflection, maintains alignment, and resists bending, enhancing the overall efficiency and longevity of CSP systems by reducing material complexity and costs.
Implementation Method 1
axial frame members joining corners of adjacent primary structural shapes such that the axial frame members form helical paths for the transmission of torque from one longitudinal end of the structural frame to the other
Implementation Method 2
a reflector coupled to the three-dimensional structural frame and shaped to concentrate solar radiation onto a receiver
Data Source
Figure 1
Figure 2~3B
Figure 3C~3E
AI summary
Solar collector modules and techniques for their construction are disclosed. In one aspect, a solar collector module includes a reflector and a three-dimensional structural frame that supports the reflector. The structural frame includes a set of primary structural shapes and a set of axial frame members connected between corners of the primary structural shapes forming helical paths for the transmission of torque from one end of the structural frame to the other. In another aspect, a method for assembling a solar collector module includes pre-assembling part of the module.