Segmented Heat Exchanger Projection Plates for Vortex Flow
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Solution Overview
Problem
The existing exhaust heat exchange apparatus has a limited heat transfer efficiency due to the small dam area for gas flow and weak low-pressure regions formed by single triangular projection plates, resulting in weak vortex flows that do not significantly promote heat exchange.
Innovation Solution
A heat exchanger design with multiple segments in the gas path, featuring first and second projection plates that are trapezoidal in shape, arranged at forward tilt angles and setting angles, which create a larger low-pressure region and promote the formation of longitudinal vortex flows that enhance heat transfer by maintaining a strong rotational axis in the gas flow direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single triangular projection plate is arranged in each segment, then the device complexity is reduced, but the heat transfer efficiency deteriorates due to small dam area and weak vortex flows
Solution Approach 1:
The fin is divided into multiple segments (first plurality and second plurality) arranged in the gas flow direction, with each segment containing projection plates. This segmentation allows multiple projection plates to be arranged without significantly increasing overall complexity while collectively generating stronger vortex flows and improving heat transfer efficiency.
Solution Approach 2:
Multiple projection plates are combined within each segment, with their individual vortex flows merging to create a cumulative effect. The first and second projection plates work together to generate longitudinal vortex flows that are stronger than those from a single projection plate, thereby improving heat transfer efficiency.
2Ease of manufacture
If a single projection plate is used in each segment, then the manufacturing cost is reduced, but the heat exchange rate deteriorates due to weak vortex flows
Solution Approach 1:
The fin structure is segmented into multiple sections along the gas flow direction, allowing projection plates to be positioned at specific intervals. This segmentation enables the use of multiple projection plates to enhance vortex flow strength and heat exchange rate while controlling manufacturing costs through standardized segment design.
Solution Approach 2:
Instead of using a single projection plate per segment, the invention employs multiple projection plates (first and second projection plates) in each segment. This partial increase in the number of components creates excessive vortex flow action that significantly improves the heat exchange rate beyond what a single projection plate could achieve.
3Productivity
If projection plates are arranged to create larger low-pressure regions, then the vortex flow strength is improved, but the device complexity increases
Solution Approach 1:
The fin is segmented into multiple sections with projection plates arranged at specific positions in each segment. This segmentation allows the creation of multiple low-pressure regions along the gas flow direction, generating stronger cumulative vortex flows while maintaining a systematic and manageable arrangement that does not excessively increase device complexity.
Solution Approach 2:
The projection plates are arranged with specific asymmetry in their positioning and orientation within each segment, creating asymmetric flow patterns that enhance low-pressure region formation. This asymmetric arrangement optimizes vortex flow generation while following a repeating pattern that controls overall device complexity.
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 enhanced heat exchanger design significantly improves heat transfer rates by sustaining longitudinal vortex flows, which mix fluid in the boundary layer and promote efficient heat exchange, outperforming traditional designs by generating stronger and longer-lasting vortex flows.
Implementation Method 1
the first projection plate and the second projection plate of each segment cause the gas flowing into each segment to flow out from each segment while causing rotation in the gas in different directions with respect to a rotational axis in the gas flow direction
Implementation Method 2
The exhaust gas and the cooling water exchange heat via the tube 110 and the fin 112
Implementation Method 3
when exhaust gas, which flows through the exhaust path 111, collides with the projection plate 113, the exhaust gas cannot flow straight, and thus a low-pressure region LPR is formed immediately downstream of the projection plate 113
Implementation Method 4
a rotational force is applied to each of the first overflow and the second overflow which each form a spiral vortex flow as illustrated in FIG. 5C
Implementation Method 5
The two spiral vortex flows move while disturbing a boundary layer (exhaust gas stagnant layer) formed in the vicinity of the surface of the exhaust path 111, thereby increasing the heat exchange rate
Data Source
AI summary
A first projection plate and a second projection plate of each segment of first plurality of segments cause gas flowing into each segment to flow out from each segment while causing rotation in the gas in different directions with respect to a rotational axis in a gas flow direction and then flow into each of two segments of second plurality of segments adjacent in a perpendicular direction to the gas flow direction.