Inflatable Line-Focusing Heliostat With Pressure-Controlled Reflector Shape
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Solution Overview
Problem
Solar energy collector systems, specifically Linear Fresnel Reflector systems, face high costs and rigidity due to the use of rigid reflectors and heliostatic equipment, limiting the maximum concentration of solar radiation and requiring expensive and heavy components.
Innovation Solution
Inflatable line-focusing heliostats made from flexible sheets and elastic materials, allowing for adjustable focus and rotation without torsional loads, enabling the use of thinner materials and reducing installation complexity through collapsibility and lightweight design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid reflectors and heliostatic equipment are used, then structural strength and stability are improved, but cost and weight increase significantly
Solution Approach 1:
The patent employs flexible reflective sheets and inflatable chambers instead of rigid glass and metal constructions. The flexible sheets can be made from thin materials like Mylar or aluminum foil, dramatically reducing weight while maintaining reflective functionality. The inflatable chambers provide structural support through internal pressure, eliminating the need for heavy rigid frameworks.
Solution Approach 2:
The patent uses pneumatic inflation of chambers to create and maintain the structural form of the reflector. By inflating chambers with air or gas, the system achieves the necessary rigidity and shape retention without requiring heavy structural materials. The pressure differential across the flexible sheets provides the stabilizing forces traditionally achieved through rigid support structures.
2Stability of the object's composition
If rigid support structures are used, then reflector stability is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex rigid support structures with a pneumatic system consisting of inflatable chambers. The chambers, when inflated, provide the necessary stability and support through internal pressure. This simplifies the overall structure by eliminating multiple rigid support components, joints, and fasteners while achieving comparable or superior stability through the pressurized flexible structure.
Solution Approach 2:
The patent changes the physical state and properties of the support structure from rigid and fixed to flexible and pressurizable. By adjusting the inflation pressure of the chambers, the system can dynamically control the stiffness and shape of the reflector support, providing stability when needed while allowing for deployment and storage configuration changes.
3Ease of manufacture
If fixed focal length reflectors are used, then manufacturing simplicity is improved, but solar concentration capability is limited
Solution Approach 1:
The patent creates a dynamic reflector system where the focal length can be adjusted by changing the inflation pressure of the chambers. As pressure varies, the shape of the flexible reflective surface changes, thereby altering the focal point. This allows a single reflector structure to adapt to different operational requirements, focusing solar radiation at varying distances from the reflector surface.
Solution Approach 2:
The patent utilizes parameter changes in the physical state of the reflector surface by varying inflation pressure. This simple mechanism allows continuous adjustment of the focal length without requiring complex mechanical moving parts or multiple fixed-position reflectors. The flexible sheet responds elastically to pressure changes, providing smooth focal length variation.
4Ease of operation
If rigid heliostatic equipment is used, then rotational control is achieved, but torsional loads and structural stress increase
Solution Approach 1:
The patent uses flexible inflatable chambers instead of rigid structures for rotational movement. These chambers can deform and rotate more easily under actuator forces without generating significant torsional stresses. The flexibility of the material allows for smooth rotational motion while distributing mechanical stresses uniformly across the structure, preventing concentration of loads that would occur in rigid joints.
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 inflatable heliostats provide a cost-effective and flexible solution for solar energy concentration, allowing for efficient solar ray focusing and easy installation, while minimizing wind and torsional loads, thereby enhancing the efficiency and accessibility of solar energy collection systems.
Implementation Method 1
a pressure differential across the sheet to form a spherically-shaped or cylindrically-shaped reflector
Implementation Method 2
These elongated structures, along their linear working sections are able to move within a working plane that is perpendicular to the main axis, thereby controllably rotating and supporting a reflector
Implementation Method 3
linear reflectors that are arrayed in parallel side-by-side rows and are oriented to reflect incident solar radiation to a common elevated receiver
Implementation Method 4
Inflatable line-focusing heliostats for use in solar concentration
Data Source
AI summary
Inflatable, flexible, collapsible, linear solar concentrator and heliostat designs, made primarily of flexible and elastic sheets enclosing and separating air-tight chambers which are elongated along and parallel to a main axis, with the chambers pressurized to different pressures form a structure and control the focus and rotation of a mirror.