Internal Grooved Copper Tube|Internal thread copper tube

What is internal grooved copper tube?

Internal grooved copper tube/Internal thread copper tube refers to the internal grooved copper with smooth outer surface and a certain number of regular threads on the internal surface.

The internal thread copper pipe is also called non smooth copper pipe, and its English name is inner grooved copper tube (IGT), which refers to the internal thread TP2 Copper Pipe with smooth outer surface, a certain number of regular threads on the inner surface.

Due to the increase of the internal surface area of the internally threaded copper tube, its thermal conductivity is 20 to 30% higher than that of the bare tube. With the world energy shortage and the implementation of the domestic energy efficiency ratio air conditioning access system, internally threaded copper pipes will be widely used in the air conditioning and refrigeration industry.

According to the requirements of the national standard GB / t20928-2007, the internal thread copper pipe products are expressed in the order of product name, brand, state, outer diameter, bottom wall thickness, tooth height plus tooth apex angle, spiral angle, thread number and standard number:

Example: TP2 M2 φ 9.53 × 0.30 + 0.20-53-18/60 GB / t20928-20072, (seamless internal thread coil made of TP2, with supply state of M2, outer diameter of 9.52mm, bottom wall thickness of 0.30mm, tooth height of 0.20mm, tooth apex angle of 53 degrees, helix angle of 18 degrees, and thread number of 60) is marked as:

Seamless internal thread coil TP2 M2 φ nine point five two × 0.30 + 0.20-53-18 / 60 GB / t20928-20072, dimension parameters of internally threaded copper tubes and their influence on heat transfer performance

Common production processes are as follows:

Internal Grooved copper Tube production process

There are continuous or intermittent spiral grooves on the inner surface of the tube, which can increase the contact area and change the flow mode of the refrigerant in the tube. The water is cooled outside the tube through the flow and evaporation of the refrigerant in the tube. The heat transfer coefficient in the tube is the same as that of a light tube. 1.5-2 times of that, the heat transfer capacity is remarkable. The outer surface of the tube can also be processed with corrugated spiral grooves to expand the scope of use. At the same time, there are also grooves in the tube that are parallel to the tubes radial direction, that is, the spiral angle is zero degrees, which can be used for heat pipe radiators. There are smooth sections and lengths at both ends that can be made according to user requirements. The maximum processing length is 7m.

Advantages of Internal Grooved copper Tube:

Due to the increase in the internal surface area of the internally threaded copper tube, its thermal conductivity is better than that of the smooth tube.

Main applications of Internal Grooved copper Tube:

Commercial air-conditioning heat exchangers, central air-conditioning dry-type evaporators, electronic products and heat pipe radiators for solar installations, etc.