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.
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.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Heat Exchangers
Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.
Heat Exchanger
The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.
Question
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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