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Chemical and Process Engineering Resources

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Category: Heat Transfer Technology
Question: How can one quickly estimate the additional pressure drop to be introduced with more tube passes?
Keywords: shell,tube,heat,transfer,exchanger,pressure,drop,increase,additional,tube,passes,pass
Answer: When the calculated pressure drop inside the tubes is underutilized, the estimated pressure drop with increased number of tube passes is: New tube DP = DP x (NPASS/OPASS)3Where NPASS = New number of tube passes. OPASS = Old number of tube passesThis would be a good estimate if advantage is not taken of the increase in heat transfer. Since the increased number of tube passes gives a higher velocity and increases the calculated heat transfer coefficient, the number of tubes to be used will decrease. Fewer tubes increases the new pressure drop. For a better estimate of the new pressure drop, add 25% if the heat transfer is all sensible heat. Source: Gulley Computer Associates