Finned tube heat exchanger and
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At present, the company needs to design a steel strip production line (RJC) for finned tube heat exchangers. The protective gas outside the tubes consists of 95% N2 + 5% H2, with a mass flow rate of 62 tons per hour. The temperature needs to be reduced from 85°C to 50°C. Circulating cooling water is used inside the tubes, with a flow rate of 130 tons per hour; the inlet water temperature is 35°C and the outlet water temperature is around 45°C. The initial design for the flow velocity inside the tubes is around 1 m–1.5 m/s. What value can be achieved for the overall heat transfer coefficient? I need experts’ advice! !
Can you stop spamming on the second floor? ? ? ? ?
If the gas outside the tube is at a slight positive pressure, the heat transfer coefficient based on the surface area of the optical tube is approximately: (50–60) × area fin ratio (W/m2·C). It also depends on the tube diameter, flow velocity, and the magnitude of the fouling thermal resistance.
Currently, the winging ratio is around 14, which means that the heat transfer coefficient can be as high as (50~60) x 14 W/㎡. C?