Grooved Heat Transfer Tube for Boundary Layer Disruption
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Solution Overview
Problem
Copper tubing, although effective for heat transfer in applications like air conditioners and heat pumps, is expensive, prompting the need for alternative materials like aluminum that require enhanced heat transfer capabilities without increasing material costs.
Innovation Solution
A heat transfer tube with a complex inner surface featuring axial primary grooves, intersecting secondary and tertiary grooves that are helically formed, which are designed to block or restrict the flow in primary grooves, thereby increasing turbulence and heat transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If aluminum is used instead of copper for condenser tubing, then material cost is reduced, but heat transfer capability deteriorates
Solution Approach 1:
The patent applies local quality by creating grooves with specific geometric features (axial grooves, helical grooves, and their intersections) at specific locations on the tube inner surface. These localized geometric modifications enhance heat transfer in critical areas without requiring a change in the base material, allowing aluminum to replace copper while maintaining heat transfer performance through localized structural optimization.
Solution Approach 2:
The patent employs curved/helical grooves instead of purely straight axial grooves. The helical grooves introduce curvature and three-dimensional flow paths that enhance turbulence and heat transfer. This curvature principle transforms the flow pattern from simple axial movement to complex three-dimensional circulation, significantly improving heat transfer capability in aluminum tubes.
2Reliability
If primary grooves are added to enhance heat transfer, then heat transfer efficiency improves, but refrigerant flow is restricted
Solution Approach 1:
The patent segments the single groove type into multiple groove types (axial grooves, helical grooves, and their intersections). This segmentation creates a multi-functional groove system where axial grooves provide primary flow paths while helical grooves and their intersections enhance heat transfer. The segmented approach allows different groove regions to serve different functions, balancing heat transfer enhancement with flow maintenance.
Solution Approach 2:
The patent transitions from two-dimensional axial grooves to three-dimensional helical grooves that wrap around the tube interior. This dimensional change creates complex flow patterns that enhance heat transfer while the helical geometry itself acts as a flow guide, preventing complete flow restriction. The third dimension (helical wrapping) adds flow control capability that simple axial grooves lack.
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 grooved structure enhances heat transfer by up to 30% compared to tubes with only axial or helical primary grooves, disrupting the refrigerant boundary layer and promoting turbulence, thus improving thermal performance while potentially reducing material costs.
Implementation Method 1
increasing turbulence and heat transfer efficiency
Implementation Method 2
disrupting the refrigerant boundary layer
Implementation Method 3
block or restrict the flow in primary grooves
Data Source
AI summary
A heat transfer tube including an inner surface including a plurality of grooves. The plurality of grooves includes at least primary grooves and secondary grooves, wherein the primary grooves extend axially along a length of the tube, and the secondary grooves intersect the primary grooves.