The difference between stainless steel heat exchange tubes and copper tube heat exchange tubes lies in the use of materials, one is made of stainless steel and the other is made of copper. The heat exchange effect of copper tube heat exchange tube is better than that of stainless steel heat exchange tube, but why is it recommended that you use stainless steel heat exchange tube in general? Let’s listen to Mingxin Stainless Steel for an overall analysis.
1. Tube wall thickness
From the perspective of tube wall thickness, due to the relationship between strength and wear, the wall thickness of copper heat exchange tubes should not be less than 1.2mm, but the wall thickness of stainless steel heat exchange tubes is very thin, which can be as thin as about 0.5-0.8mm.
In terms of the law of thermal conductivity and thermal resistance: the thermal conductivity remains constant, the smaller the thickness of the wall tube, the smaller the thermal conductivity and the greater the heat transfer coefficient. Therefore, the stainless steel tube can reduce the overall heat transfer coefficient with the copper tube by reducing the wall thickness. Under the same heat transfer area, the overall heat transfer coefficient is 2%-8% higher than that of the copper tube.
2. Oxidation resistance
Stainless steel heat exchange tubes are made of stainless steel with strong oxidation resistance, while copper tubes have poor oxidation resistance and are prone to patina. The longer the use time, the thicker the oxide layer on the surface of the copper tube heat exchange tube will be, and the more scale will be formed inside, resulting in poor heat transfer effect. On the contrary, the stainless steel heat exchange tube will basically not be oxidized, even if it is oxidized, The speed is also slow, and the smooth inner wall makes the thickness of the bottom layer of the boundary laminar flow thinner, and the inner wall is not easy to scale.
3. Material hardness
The material of the stainless steel heat exchange tube has strong hardness, which can improve the impact resistance and vibration resistance of the heat exchange tube. The pressure difference is used for leakage inspection, and there is no pressure drop for five minutes.
Therefore, from an overall point of view, the use of stainless steel heat exchange tubes will have a longer service life and a longer effect.