Smooth copper tubes and coils are the most widely used forms of copper tubes in the air conditioning and refrigeration industry. They feature a smooth surface and uniform wall thickness, making them an ideal cost-effective choice for AC heat exchangers and various connection piping applications.

Kenergy's smooth tubes are manufactured using advanced continuous casting and rolling processes, providing clean inner and outer surfaces free from oxidation. Internal wall residues are strictly controlled within industry standards. Coil products are packaged in large-diameter coils, with single coil lengths reaching up to hundreds of meters, enabling continuous production and automatic feeding while reducing material changeover time and improving production efficiency.

Core Advantages

High-precision wall thickness control

Wall thickness tolerance is controlled within ±0.02mm, ensuring consistent tube dimensions after expansion for reliable heat exchanger components.

Excellent internal surface cleanliness

A specialized cleaning process keeps internal wall residues at ≤0.02 g/m², preventing capillary blockage and ensuring system reliability.

Large coil packaging

Single coil lengths range from 500 to 2000 meters, reducing coil changes and significantly improving production line efficiency.

Annealed soft/half-hard temper options

Soft (O) and half-hard (H55) tempers are available to meet your tube expansion process requirements and application needs.

Technical Parameters

Outer Diameter (mm)	Bottom Wall (mm)	Tooth Height (mm)	Number of Teeth	Helix Angle (°)	Weight (g/m)	Heat Transfer Area (m²/m)	Material
7.00	0.25-0.32	0.12-0.18	45-55	15-25	42-50	0.021-0.024	TP2, T2
9.52	0.30-0.40	0.14-0.20	50-65	18-28	52-62	0.025-0.028	TP2, T2
7.94	0.27–0.35	0.12–0.18	45-60	18>28	63–75	0.028–0.032	TP2, T2

Typical Applications

Window and Portable AC Heat Exchangers

Cost-effective condensers and evaporators for window units, mobile air conditioners, and dehumidifiers.

Indoor/Outdoor Unit Connection Pipes

Connecting lines between the indoor and outdoor units of split air conditioning systems.

Refrigeration System Accessories

Pipe components such as check valves, four-way reversing valves, and accumulator connecting pipes.

Instruments and Capillary Tubes

Precision small-diameter tubes for pressure gauges, sensing lines, and capillary restrictors.

Frequently Asked Questions

Q: What is the cost difference between smooth tubes and internally grooved tubes?

Smooth tubes are typically 10-20% cheaper than internally grooved tubes of the same diameter and wall thickness. For applications with moderate heat transfer requirements, smooth tubes provide a more economical solution without compromising system performance. For high-efficiency applications, we recommend evaluating the overall system cost-effectiveness, as internally grooved tubes can reduce the size and material usage of heat exchangers.

Q: How can coil packaging be prevented from deforming during transportation?

Our coil products are wound on sturdy steel spools with proper tension control to maintain coil integrity. Each coil is secured with multiple circumferential straps and wrapped with moisture-proof polyethylene film and woven fabric. The spool design supports the coil weight and prevents deformation during handling and transportation. For large coils, we use wooden frames or pallets to provide additional protection.

Q: What is your residual carbon control standard for smooth tubes?

Our internal wall residual carbon content is controlled at ≤0.02 g/m², which meets industry standard requirements for AC applications. This low residual level prevents capillary tube blockage and ensures long-term system reliability. For applications requiring stricter control, we offer enhanced cleaning processes upon request, achieving ≤0.01 g/m².

Q: Can you manufacture non-standard outer diameters?

Yes, we offer customized non-standard outer diameters to meet specific application requirements. Custom sizes may require specialized tooling and are subject to minimum order quantities. Please provide your desired diameter, wall thickness, and tolerance requirements to our engineering team, and we will evaluate feasibility and provide a quotation. Typical lead time for custom sizes is 3-4 weeks.

Smooth Copper Tubes / Coils for AC