How to select a closed cooling tower
How to select a closed cooling tower
Apr 28, 2025
How to choose a suitable and efficient closed cooling tower is a challenge for users. Today, Huatal Cooling will share with you the key value in the pressure loss of closed cooling towers: absolute roughness, hoping to help you.
Absolute roughness is a term in hydraulics. Due to the influence of processing conditions and operation, the solid wall of the pipeline is always more or less rough and uneven. The average height of the rough protrusion is called absolute roughness. Generally, cold-drawn tubes use f grade, Ra=3.2μm; cold-rolled tubes use e grade, Ra=1.6μm, and the allowable deviation is Ra+25%. In closed cooling towers, absolute roughness is mainly manifested in the following aspects:
1.Absolute roughness affects the wear resistance of the coil. The rougher the surface, the smaller the effective contact area between the mating surfaces, the greater the pressure, and the faster the wear.
2.Absolute roughness affects the stability of the mating properties, and the welding requirements between pipes and between the heat dissipation coil and the manifold are relatively high. For clearance fit, the rougher the surface, the easier it is to wear, causing the gap to gradually increase during the working process; for interference fit, the actual effective interference is reduced and the connection strength is reduced because the microscopic peaks are squeezed flat during assembly.
3.Absolute roughness affects the fatigue strength of the coil. There are large troughs on the surface of rough parts. Like sharp notches and cracks, they are very sensitive to stress concentration, thus affecting the fatigue strength of the parts.
4.Absolute roughness affects the corrosion resistance of the radiator. The rough surface makes it easy for corrosive gases or liquids to penetrate into the metal inner layer through the microscopic valleys on the surface, causing surface corrosion. 5. Absolute roughness affects the sealing of the entire closed cooling tower cooler. Rough surfaces cannot fit tightly together, and gases or liquids leak through the gaps between the contact surfaces.
General 304 stainless steel seamless steel pipes have hollow cross-sections and are widely used as pipes for conveying fluids. They are commonly used coils for closed cooling towers.
Jiangsu Huatal Cooling Technology Co., Ltd. focuses on the research and development, manufacturing and service of industrial cooling equipment. Its products include medium cooling, air cooling and hybrid combined cooling systems. With high-quality products and professional services, Huatal makes the cooling system more energy-saving, environmentally friendly, efficient, reliable, durable and convenient, and continuously creates the greatest value for customers.
For details, please refer to the "Closed Cooling Tower Selection Manual" compiled by Jiangsu Huatal Cooling Technology Co., Ltd.
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