Raceway Algae Channel Depth Variation for Pump Energy Loss
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Solution Overview
Problem
Open raceway algae cultivation systems experience significant energy losses due to high velocity and acceleration of algae slurry at pump entry and exit zones, leading to increased operating costs.
Innovation Solution
The system incorporates a channel design with contraction and expansion zones, where the depth increases leading into the pump and decreases exiting the pump, maintaining a constant cross-sectional area to reduce fluid velocity and energy losses, utilizing a pump with a width less than the channel to create these zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the channel bottom is level or gently sloped, then the system structure is simple, but the fluid velocity becomes much higher in pump entry and exit zones resulting in large energy losses
Solution Approach 1:
The channel depth is varied locally in specific zones (contraction zone before pump, expansion zone after pump) while maintaining uniform depth in other sections. This localized modification creates controlled velocity distributions that reduce energy losses without requiring complete restructuring of the entire channel system.
Solution Approach 2:
The channel depth parameter is changed in specific zones to control fluid velocity. By increasing depth in the contraction zone and decreasing depth in the expansion zone, the system optimizes velocity distribution to minimize energy losses while maintaining overall structural simplicity.
2Loss of energy
If the channel depth increases leading into the pump and decreases exiting the pump, then energy losses are reduced, but the channel structure becomes more complex
Solution Approach 1:
The non-uniform depth configuration is applied only in specific contraction and expansion zones rather than throughout the entire channel. This localized approach reduces energy losses while minimizing the overall structural complexity of the system.
3Loss of energy
If the pump width is less than the channel width, then contraction and expansion zones are created to reduce velocity, but the device complexity increases
Solution Approach 1:
The contraction and expansion zones act as intermediary regions between the pump and the main channel. These zones mediate the velocity changes by gradually transitioning the flow area, reducing abrupt velocity changes and associated energy losses without requiring direct modification of the pump itself.
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 design maintains constant fluid velocity in contraction and expansion zones, significantly reducing energy losses and operational costs by minimizing velocity gradients and maintaining a constant cross-sectional area throughout the system.
Implementation Method 1
The depth of the contraction zone is greater than a depth of at least a portion of the channel located outside of the contraction zone... maintaining a constant cross-sectional area to reduce fluid velocity and energy losses
Data Source
AI summary
An open raceway algae cultivation system includes a channel configured to contain an algae cultivation fluid. The channel includes a contraction zone having a width and a depth. A pump is configured to circulate the algae cultivation fluid in the channel. A width of the contraction zone decreases leading into the entrance of the pump and a depth of the contraction zone is greater than a depth of at least a portion of the channel located outside of the contraction zone.