Microchannel Heat Exchanger With Height-Based Fin Density Variation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional microchannel heat exchangers with uniform fin orientation across sections result in undesirable fluid distribution and reduced efficiency due to inconsistent heat transfer rates.
Innovation Solution
A microchannel heat exchanger with varying fin densities in different sections to optimize fluid flow and enhance heat transfer efficiency by adjusting fin density based on location along the height of the exchanger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform fin orientation is used across all sections, then manufacturing is simplified, but heat transfer efficiency deteriorates due to inconsistent fluid distribution
Solution Approach 1:
The patent applies local quality by varying the fin orientation angle in different sections of the heat exchanger. Specifically, the fin orientation angle changes from section to section along the fluid flow path, allowing each local region to have optimized fin orientation for its specific heat transfer requirements, thereby improving overall heat transfer efficiency while maintaining manufacturing feasibility through standardized fabrication processes
2Reliability
If varying fin density is implemented, then heat transfer efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements parameter changes by systematically varying the fin orientation angle as a key geometric parameter across different sections. This controlled parameter variation allows optimization of heat transfer performance through adjusted fin orientation while maintaining a relatively simple overall structure. The variation follows a predetermined pattern that balances performance improvement with manufacturing complexity
3Device complexity
If traditional uniform fin design is used, then device complexity is reduced, but fluid velocity profile deteriorates leading to reduced productivity
Solution Approach 1:
The patent applies local quality by implementing section-specific fin orientation angles that are optimized for local fluid flow conditions. Each section has fin orientations tailored to its position in the heat exchanger, creating improved fluid velocity profiles and heat transfer characteristics in each local region, which collectively enhance overall heat exchange productivity
Solution Approach 2:
The patent applies dynamics by creating a gradient in fin orientation angles that adapts to the changing fluid flow conditions along the heat exchanger. The fin orientation varies dynamically from section to section, optimizing performance for different locations rather than using a static uniform design, thereby improving fluid distribution and heat exchange efficiency
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 varying fin density design improves fluid velocity profiles, increasing heat transfer efficiency and optimizing thermal energy exchange across the exchanger.
Implementation Method 1
A set of fins may be disposed between adjacent microchannel tubes to facilitate heat transfer between the working fluid and another fluid
Data Source
AI summary
A heat exchanger of a heating, ventilation, air conditioning, and refrigeration (HVAC&R) system includes a plurality of microchannel tubes, where each microchannel tube of the plurality of microchannel tubes is configured to direct refrigerant therethrough, and a plurality of fin sets, where each fin set of the plurality of fin sets is disposed between corresponding adjacent microchannel tubes of the plurality of microchannel tubes. Additionally, each fin set of the plurality of fin sets includes a respective fin density based on a location of the respective fin set along a height of the heat exchanger.