Heat exchanger core
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Solution Overview
Problem
The performance of heat exchange in corrugated-fin-type heat exchangers with louvers cut and raised in one direction is limited, and air flow stagnation occurs at the ends of the core, leading to increased air flow resistance.
Innovation Solution
The core height, cutting and raising louver width, and louver angle are optimized to satisfy the inequality H > Qup/(Qup−1)×ΔH, where Qup = α(W) + β(W,θ) + 1, α(W) = η/(W−η), β(W,θ) = ξ/(W·tan2 2θ−ξ), and ΔH = j·W(sin θ+k·sin2 θ), to improve heat exchange performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If louvers are cut and raised in one direction only, then manufacturing complexity is reduced, but air flow stagnation occurs at end portions increasing air flow resistance
Solution Approach 1:
The patent applies local quality by providing space portions at specific locations (above and below the core at end portions) rather than uniformly throughout. This localized structural modification addresses the air flow stagnation problem only where it occurs, maintaining simple one-directional louver configuration elsewhere while reducing harmful air flow resistance effects
2Productivity
If core height and louver dimensions are not optimized, then manufacturing is simpler, but heat exchange performance is limited
Solution Approach 1:
The patent applies parameter changes by establishing specific mathematical relationships between core height H, louver width W, and louver angle θ through inequalities (H>Qup/(Qup−1)×ΔH, Qup=Qup(W,θ)=α(W)+β(W,θ)+1, ΔH=ΔH(W,θ)=j·W(sin θ+k·sin2 θ)). These optimized parameter ranges enable improved heat exchange performance while providing clear manufacturing guidelines
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 optimization enhances the heat transfer ratio while minimizing the air-flow reduced region, resulting in improved heat exchange performance compared to conventional multi-directional louver fins.
Implementation Method 1
a number of flat tubes and a number of corrugated fins alternately aligned in parallel to each other to flow first fluid in the tubes, and flow second fluid on an outer face side of the tubes and in the corrugated fins
Implementation Method 2
flow second fluid on an outer face side of the tubes and in the corrugated fins
Data Source
AI summary
A corrugated fin heat exchanger is provided in which the direction in which louvers are cut and raised is inclined in one direction only, and in which heat transfer performance is improved above that of conventional fins. To accomplish this, the relationship H>Qup/(Qup−1)×ΔH is satisfied.H represents the core height of the heat exchanger,Qup represents the ratio of the amount of heat exchanged per corrugation between one-directional louver fins and multi-directional louver fins in an airflow part,and ΔH represents the amount of increase in a heat transfer reduction region of a heat exchanger core as a result of changing from multi-directional louver fins to one-directional louver fins.