In a shell-and-tube heat exchanger with hi = ho = 5600 W/(m2 K) and negligible wall resistance, by what percent would the overall heat transfer coefficient (based on the outside area) change if the number of tubes was doubled? The tubes have an outside diameter of 2.5 cm and a tube wall thickness of 2 mm. Assume that the flow rates of the fluids are constant, the effect of temperature on fluid properties is negligible, and the total cross sectional area of the tubes is small compared to the flow area of the shell.GIVENShell and tube heat exchangerHeat transfer coefficients: hi = ho = 5600 W/(m2 K)Negligible wall resistanceTube outside diameter (Do) = 2.5 cm = 0.025 mTube wall thickness (t) = 2 mm = 0.002 mASSUMPTIONSFlow rates of the fluids are constantThe effect of temperature of fluid properties is negligibleThe fluid flow is turbulent in the tubes (this is consistent with the high heat transfercoefficients)

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Shell fluld - Tube fluld