Cold water with a mass flow rate of 9800 kg/h is heated from 40 to 115 oC in a countercurrent flow double pipe heat exchanger, for which overall heat transfer coefficient is 1480 W/m2K, with hot water...

Cold water with a mass flow rate of 9800 kg/h is heated from 40 to 115 oC in a countercurrent flow double pipe heat exchanger, for which overall heat transfer coefficient is 1480 W/m2K, with hot water having a flow rate of 4800 kg/h and inlet temperature of 295 oC. As time passed by, the performance of the heat exchanger and hence the heat transfer rate decreases by 30% due to the heavy fouling conditions in the system. a) Draw the temperature profile and fully label it. b) Calculate the necessary area to accomplish desired heat transfer.