Thinning the thickness of the stainless steel tube can effectively improve the overall thermal conductivity of the stainless steel tube. When choosing a stainless steel tube with a wall thickness of 0.5-0.7mm, from the experimental results, the thermal conductivity of a 0.7mm thick stainless steel tube and a 1mm copper tube is almost the same, because the thickness of the stainless steel tube is thin, and there is also excellent resistance Corrosion performance and surface smoothness, so the convective heat release coefficient gives you a condensation heat release coefficient greater than copper.
The wall thickness is reduced, the diameter is increased, the water resistance is reduced, the flow rate is increased, the outlet water temperature is reduced, and the logarithmic average temperature difference is reduced. The combined effect is that the relative vacuum increases. The inside and outside surfaces of the stainless steel tube are smooth, and it is not easy to foul. It can effectively reduce the number of cleaning, can reduce the maintenance cost, and the stainless steel tube is resistant to wear and vibration, and has a long service life.
Thin wall thickness, lighter weight than copper tube, relative investment reduction, material toughness, yield, tensile strength are better than copper tubes, in addition, the expansion of stainless steel tube expansion is not only welding, even if it is affected by thermal expansion and contraction No leakage will occur. Therefore, the stainless steel tube is an ideal heat exchange tube instead of a copper tube.
The advantages of stainless steel heat transfer tubes include: high thermal conductivity, smooth inside and outside of the tube wall, low scaling, tensile strength, bending strength, yield strength higher than that of copper tubes, certain compensation functions, strong pressure resistance, vibration resistance, and corrosion resistance. More sexual.
However, stainless steel tubes have some disadvantages because of the production process of seamless steel tubes, which are cold drawing and cold rolling. The cost of cold drawing is low, but the quality cannot be guaranteed and the pressure vessel cannot be used.
The cold rolling process is complicated and costly. Even if the heat treatment eliminates the stress, the micro cracks and wall thicknesses during the rolling process are uneven in size, and pitting phenomena and the like are prone to quality problems.
Source: China Stainless Steel Tubes Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)