Zigzag Channel Ballast Block Aerodynamic Stability
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Solution Overview
Problem
Conventional ballast block systems are prone to being lifted by high wind velocities due to aerodynamic pressure differentials, posing safety risks and exposing underlying roof structures to damage, and existing designs with labyrinthine channels are inefficient for fluid flow and complex to manufacture and install.
Innovation Solution
A ballast block system featuring a zigzag pattern of fluid receiving channels along its sides, forming approximate V-shapes that improve fluid flow and reduce the likelihood of displacement, with interlocking mechanisms for stability and ease of installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional ballast blocks are used, then they provide basic wind resistance, but they are lifted by high velocity winds due to aerodynamic pressure differential
Solution Approach 1:
The patent converts the harmful aerodynamic pressure differential that lifts blocks into a beneficial force by designing channels that allow air to flow through the block. The channels enable the lower surface to experience higher pressure during wind events, transforming the lifting force into a downforce that presses the block against the roof membrane, thereby improving aerodynamic stability.
2Quantity of substance
If labyrinthine channels with 90° turns are used, then fluid flow is directed from top to bottom, but friction reduces flow efficiency
Solution Approach 1:
The patent replaces the conventional 90° angular turns with curved transitions in the channel design. These curved channels reduce flow separation and friction losses compared to sharp corners, thereby improving fluid flow efficiency while maintaining the ability to direct air from the top to the bottom of the block.
3Quantity of substance
If labyrinthine channel systems are implemented, then fluid flow paths are created, but manufacturing and installation complexity increases
Solution Approach 1:
The patent divides the ballast block into distinct functional segments: an upper portion with channels for fluid flow, and a lower portion with chambers for fluid accumulation and pressure equalization. This segmentation simplifies the overall design compared to complex labyrinthine systems, making the block easier to manufacture and install while maintaining effective fluid flow capability.
4Strength
If ballast blocks are made heavier to resist wind, then wind resistance improves, but installation difficulty and structural load increase
Solution Approach 1:
The patent uses pneumatic principles by incorporating channels and chambers that allow air pressure to act on the lower surface of the block during wind events. This generates an aerodynamic downforce that compensates for the block's weight, providing enhanced wind resistance without requiring heavier materials, thereby maintaining ease of installation and reducing structural load.
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 ballast block system provides enhanced aerodynamic stability, efficient fluid flow, and simplified manufacturing and installation, reducing the risk of displacement under high winds and maintaining structural integrity.
Implementation Method 1
High velocity winds, such as those of hurricane-force, passing over irregular or critical roof locations may induce an aerodynamic pressure differential across the conventional blocks to lift them out of place.
Implementation Method 2
aerodynamically stable ballast block... provides enhanced aerodynamic stability, efficient fluid flow
Data Source
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AI summary
A ballast block is provided with a body and a plurality of fluid receiving channels. The body includes a top surface, a bottom surface positioned opposite the top surface, and a first side extending between the top surface and the bottom surface. The plurality of fluid receiving channels are disposed along the first side in a plurality of units and extending from the top surface to the bottom surface to form a zigzag pattern. Each unit of the plurality of units having an adjacent pair of fluid receiving channels extending at opposing angles toward each other from the top surface to the bottom surface in an approximate V-shape.