Hot water (Cp= 4.188 kJ/kg.K) with mass flow rate of 2.5 kg/s at 100 C enters a thin-walled concentric tube counterflow heat exchanger with a surface area of 23 m^2 and an overall heat transfer coefficient of 1000 W/m^2.K. Cold water (Cp= 4.178 kJ/kg.K) with mass flow rate of 5 kg/s enters the heat exchanger at 20 C. (A) Use the Effectiveness-_NTU method, determine the heat transfer rate for the heat exchanger. (B) Determine the outlet temperatures of the cold and hot fluids. (C) After a period of operation, the overall heat transfer coefficient is reduced to 500 W/m^2.K. determine the fouling factor that caused the reduction in the overall heat transfer coefficient.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Hot water (Cp= 4.188 kJ/kg.K) with mass flow rate of 2.5 kg/s at 100 C enters a thin-walled concentric tube counterflow heat exchanger with a surface area of 23 m^2 and an overall heat transfer coefficient of 1000 W/m^2.K. Cold water (Cp= 4.178 kJ/kg.K) with mass flow rate of 5 kg/s enters the heat exchanger at 20 C. (A) Use the Effectiveness-_NTU method, determine the heat transfer rate for the heat exchanger. (B) Determine the outlet temperatures of the cold and hot fluids. (C) After a period of operation, the overall heat transfer coefficient is reduced to 500 W/m^2.K. determine the fouling factor that caused the reduction in the overall heat transfer coefficient.
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