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Mechanical EngineeringQ&A LibraryHot water (cph = 4188 J/kg·K) with mass flow rate of 2.5 kg/s at 100°C enters a thin-walled concentric tube counter-flow heat exchanger with a surface area of 23 m2 and an overall heat transfer coefficient of 1000 W/m2·K. Cold water (cpc = 4178 J/kg·K) with mass flow rate of 5 kg/s enters the heat exchanger at 20°C, determine (a) the heat transfer rate for the heat exchanger and (b) the outlet temperatures of the cold and hot fluids. After a period of operation, the overall heat transfer coefficient is reduced to 500 W/m2·K, determine (c) the fouling factor that caused the reduction in the overall heat transfer coefficient.Start your trial now! First week only $4.99!*arrow_forward*

Question

Hot water (cph = 4188 J/kg·K) with mass flow rate

of 2.5 kg/s at 100°C enters a thin-walled concentric tube

counter-flow heat exchanger with a surface area of 23 m2

and an overall heat transfer coefficient of 1000 W/m2·K.

Cold water (cpc = 4178 J/kg·K) with mass flow rate of 5 kg/s

enters the heat exchanger at 20°C, determine (a) the heat

transfer rate for the heat exchanger and (b) the outlet temperatures

of the cold and hot fluids. After a period of operation,

the overall heat transfer coefficient is reduced to 500 W/m2·K,

determine (c) the fouling factor that caused the reduction in

the overall heat transfer coefficient.

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