The concept of finalization ratio of laser welded finned tube
The area of Murphy laser-welded finned tube is the sum of the total area of the expanded outer diameter of the tube, including three parts, the area of the base tube, and the area of the front and back of the fin. Since the fin has thickness, the area on the fin should be added. Of course, the area of the base tube should be deducted from the part covered by the fin thickness.
The area exposed to air shall be accumulated. In order to simplify the calculation, the expansion and increase of the helical shape are usually ignored, and the trapezoid fin is regarded as a rectangle. The difference between the two parts is relatively small.
The thickness of the cladding layer is related to the joint tightness of laser welding finned tube, many users to ignore the problem, qualified DR steel aluminum composite finned tube contact pressure between the inside and outside the wall should be greater than 6.0 Mpa, low contact pressure affect the heat transfer performance, and can make the base tube exposed to air, cause the corrosion, so as to shorten the service life.
The area exposed to air shall be accumulated. In order to simplify the calculation, the expansion and increase of the helical shape are usually ignored, and the trapezoid fin is regarded as a rectangle. The difference between the two parts is relatively small.
The thickness of the cladding layer is related to the joint tightness of laser welding finned tube, many users to ignore the problem, qualified DR steel aluminum composite finned tube contact pressure between the inside and outside the wall should be greater than 6.0 Mpa, low contact pressure affect the heat transfer performance, and can make the base tube exposed to air, cause the corrosion, so as to shorten the service life.
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