Twisted-Blade Solar Roof Fan for Low-Power Airflow
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Solution Overview
Problem
Existing attic and portable fans have inefficiencies in air removal rates and power consumption, with standard flat metal blades failing to maximize airflow and relying on electrical power, which is not suitable for areas with limited power supply or natural disasters.
Innovation Solution
The development of solar-powered fans with optimized twisted nonmetal blades, specifically designed for efficient airflow in smaller diameters, operating up to 500 RPM, and integrated with a single molded plastic hub, reducing power consumption and enhancing air movement by up to 30% compared to conventional fans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If standard flat metal blades are used in attic fans, then the fan structure is simple and manufacturing is easy, but air moving performance is only fair and power consumption is high
Solution Approach 1:
The patent applies curved blade design with specific airfoil cross-sections and twist angles to maximize aerodynamic efficiency. The blades feature a curved leading edge, tapered width, and optimized twist distribution from root to tip, transforming the flat blade design into a three-dimensional aerodynamic shape that moves air more efficiently while reducing power consumption
Solution Approach 2:
The patent optimizes multiple blade parameters including twist angle (15-45 degrees), airfoil cross-section shape, blade width taper ratio, and curvature radius to achieve maximum air moving performance. These parameter changes transform the conventional flat blade into a high-efficiency aerodynamic blade that reduces power consumption while increasing productivity
2Use of energy by moving object
If solar panels are integrated with the fan, then power consumption from electrical supply is reduced, but device complexity increases
Solution Approach 1:
The patent implements self-service by integrating solar panels directly with the fan unit, allowing the fan to generate its own power from sunlight. The solar panel is mounted on the fan housing or integrated into the blade structure, enabling the system to be self-powered and independent of external electrical supply, thereby reducing electrical power consumption to zero during daytime operation
Solution Approach 2:
The patent merges the solar power generation system with the fan unit into a single integrated device. The solar panel, motor, and fan blades are combined into one compact system, reducing device complexity compared to separate installations while maintaining the benefit of reduced electrical power consumption
3Productivity
If twisted nonmetal blades are used, then air moving efficiency is maximized, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific parameter ranges for blade twist angle (15-45 degrees), airfoil cross-section dimensions, and width taper ratios that balance manufacturing feasibility with aerodynamic performance. These standardized parameter specifications make it easier to manufacture precise twisted blades using conventional techniques while maintaining high air flow generation efficiency
Solution Approach 2:
The patent applies different geometric properties to different parts of the blade: the root section has higher twist angles for structural stability, the mid-section has optimized airfoil cross-sections for lift generation, and the tip section has reduced width and twist for drag reduction. This local quality differentiation maximizes air flow generation while simplifying manufacturing by breaking down complex geometry into manageable sections
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 solar-powered fans achieve significant energy efficiency, moving more air with less power consumption, suitable for both attic ventilation and portable use, including during natural disasters and in areas with limited power, while being environmentally friendly and cost-effective.
Implementation Method 1
The fan is solar powered with a solar panel mounted on the housing
Implementation Method 2
a motor mounted on the housing and connected to the blades
Implementation Method 3
optimized twisted nonmetal blades that are solar powered... moving more air than existing ventilation fans
Data Source
AI summary
Highly efficient ventilation fans for exhausting air out from underneath roofs, and/or for being portable in use and application. The fan can include optimized airflow blades having a twisted configuration that can move at a rotational speed operation of up to approximately 500 rpm. The approximately 15 inch diameter twisted blades can be premolded on a hub that together form a single molded unit of plastic. They can also be fabricated using metal. The unit can be mounted in an exhaust outlet having a conical diffuser on or adjacent to a roof. Alternatively, the fan can be portable for use most anywhere there is a need for ventilation and moving of air. The blades can rotate by a solar powered motor, where the blades and motor can generate up to approximately 1040 cfm while using no more than approximately 16 Watts.