Internally grooved copper tubes, also known as Inner Grooved Tubes (IGT), are a specialized type of heat exchanger tube. Their defining feature is a smooth outer surface and an inner surface machined with a precise pattern of grooves or fins. This internal structure significantly boosts heat transfer efficiency by 20% to 30% compared to smooth-walled tubes.
Key Specifications and Their Impact on Performance
The performance of an IGT is determined by multiple interrelated geometric parameters. The table below summarizes these key specifications and their influence on heat transfer and system operation.
| Parameter | Typical Range / Common Sizes | Impact on Heat Transfer & Selection Considerations |
|---|---|---|
| Outer Diameter (OD) | 9.52 mm, 7.00 mm, 7.94 mm, 6.35 mm, 5 mm | Smaller diameters save material and space, supporting miniaturization trends. However, too small a diameter increases refrigerant flow resistance, raising system pressure drop. |
| Base Wall Thickness | 0.20 – 0.30 mm | A thinner wall improves heat conduction but compromises mechanical strength, increasing risks of leaks, bursts, or deformation during bending and welding. |
| Fin Height | 0.10 – 0.25 mm | A higher fin increases the heat transfer surface area and disrupts the refrigerant liquid film more effectively, enhancing performance. It is limited by manufacturing capabilities. |
| Helix Angle | Specific optimum range (varies by design) | A larger angle increases fluid turbulence ("swirl") and heat transfer coefficient, but also significantly raises pressure loss. An optimal balance must be found. |
| Fin Tip Angle | Can be as low as ~20° | A smaller angle increases surface area and thins the liquid film. However, if too small, it weakens the fin's structural integrity during tube expansion, causing collapse and reduced efficiency. |
| Number of Fins (Grooves) | Optimized for specific diameters | More fins provide more nucleation sites for boiling but can make spacing too tight. This reduces fluid mixing and increases liquid film thickness, potentially negating benefits. |
| Groove Bottom Width | Wider is generally better | A wider groove base is beneficial for heat transfer but must be balanced with maintaining fin strength during manufacturing and assembly processes. |
Selection Guideline for Optimized Heat Transfer
Choosing the right IGT involves balancing thermal performance with mechanical and hydraulic constraints. Here is a logical framework for selection:
Define Core Requirements: Start with the primary application (evaporator or condenser), required heat load, refrigerant type, and allowable system pressure drop.
Prioritize Key Parameters for Your Goal:
For maximum heat transfer (often in evaporators): Prioritize tubes with higher fin height, smaller fin tip angle, and a larger wetted perimeter.
For balanced performance with lower pressure drop (often in condensers or long circuits): A moderate helix angle and careful optimization of fin count are crucial to avoid excessive flow resistance.
Ensure Mechanical Integrity: Verify that the chosen base wall thickness and fin geometry (tip angle, groove width) provide sufficient strength for manufacturing processes like U-bending and brazing, as well as for system operating pressures.
Consider System Trends: Align with industry shifts toward smaller diameters for compactness and material savings, but always validate that the reduced diameter does not create unacceptable flow resistance in your specific system layout.
Selecting the optimal internally grooved copper tube is a multi-variable optimization task. There is no single "best" specification; the ideal tube is one where the geometric parameters-diameter, fin dimensions, and helix angle-are harmonized to deliver superior heat transfer while maintaining structural robustness and acceptable fluid flow characteristics for the intended application.
Our product range
| Product Category | Product Name | Common Standard Grades | Key Specifications (Typical) | |
|---|---|---|---|---|
| Copper Tubes / Pipes | • Straight & Coiled Tubes • Refrigeration Tubes • Capillary Tubes • Heat Exchanger Tubes |
C11000 (ETP Copper) C12200 (DHP Phosphorous Copper) C12000 (DLP Phosphorous Copper) EN 12735-1: CU-DHP JIS H3300: C1220, C1100 |
Standards: ASTM B75, B88, B280, EN 12735 OD: 3mm - 300mm Wall Thickness: 0.3mm - 10mm Condition: Annealed (O), Hard (H) |
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| Copper Sheets / Plates | • Hot Rolled Plates • Cold Rolled Sheets • Cut-to-Size Blanks |
C11000 (ETP Copper) C10200 (Oxygen-Free Copper) C26000 (Cartridge Brass) C70600 (90-10 CuNi) |
Standards: ASTM B152, B465 Thickness: 0.5mm - 50mm (Plates: >3mm) Width: up to 1500mm Length: up to 4000mm or custom Condition: Rolled, annealed, mill finish |
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| Copper Rods / Bars | • Round, Square, Hexagonal Rods • Copper Alloy Rods • Precision Ground Bars |
C11000 (ETP Copper) C36000 (Free-Cutting Brass) C26000 (Cartridge Brass) C10200 (Oxygen-Free Copper) C17200 (Beryllium Copper) |
Standards: ASTM B187, B301, EN 12163, 12164 Diameter: 2mm - 200mm Length: Straight bars up to 6m, coils available Condition: Drawn, extruded, annealed |
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| Copper Wires | • Bare Copper Wire (Hard/Soft) • Enamelled (Magnet) Wire • Stranded & Bunched Wires • Braided Wires & Flexibles |
C11000 (ETP Copper) C10200 (Oxygen-Free Copper) C10100 (C-OF Copper) Grade: 1/2 Hard, 1/4 Hard, Soft |
Standards: ASTM B1, B2, B3, IEC 60228 Diameter: 0.05mm - 12mm (bare) Conductivity: 100% IACS min. Packaging: Spools, coils, drums |
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| Copper Foils | • Rolled Strips (in Coils) • Thin Foils • Connector Alloy Strips |
C11000 (ETP Copper) C26000 (Cartridge Brass) C19210 (Phosphor Bronze, 1.0%) C26800 (Yellow Brass) |
Standards: ASTM B152, B465, EN 1652 Thickness: 0.05mm - 3.0mm (Strips), <0.05mm (Foil) Width: 10mm - 600mm (typical coil width) Condition: Hard (H), 1/2 Hard, Soft (O), rolled temper |
Our factory
We are a specialized manufacturing factory with integrated production capabilities for copper and copper alloy products, including tubes, rods, bars, plates, sheets, strips, and wires. Our facility is equipped with modern production lines featuring extrusion presses, continuous casting machines, precision rolling mills, drawing benches, and controlled annealing furnaces, enabling us to control the entire process from raw material to finished product. Supported by an in-house laboratory for quality assurance and compliant with international standards (ASTM, EN, JIS), we provide customized solutions, reliable packaging, and efficient export logistics to serve global clients in HVAC&R, electrical, automotive, and industrial sectors.
copper product packaging
We take great care in packaging to ensure our copper products arrive in perfect condition. Standard packaging includes moisture-resistant materials, sturdy wooden crates or pallets, and protective corner guards to prevent damage during transit. For products requiring enhanced protection against oxidation, such as high-purity copper tubes or finely finished surfaces, we also offer optional nitrogen-purged (inert gas) packaging upon request. This service effectively minimizes surface oxidation during long-distance shipping or storage, ensuring your products maintain their optimal quality upon arrival.
