- A Double Pipe Counter Flow Heat Exchanger As Shown In Figure 3 Is Use To Cool Ethylene Glycol Cp 2560 J Kg C With 1 (80.58 KiB) Viewed 15 times
A double-pipe counter-flow heat exchanger as shown in Figure 3 is use to cool ethylene glycol (Cp = 2560 J/kg. °C) with flowing at a rate of 3.5 kg/s from 80 °C to 40 °C by water (cp=4180 J/kg. °C) that enters at 20 °C and leaves at 55 °C. The overall heat transfer coefficient based on the inner surface area of the tube is 250 W/m².°C. a) b) c) d) e) Hot glycol 80°C 3.5 kg/s Calculate the rate of heat transfer. Cold water 20°C Figure 3 raw the temperature profile for this counter-flow heat exchanger. Determine the mass flow rate of water. 40°C [2 marks] [CO2, PO2, C2] [3 marks] [CO2, PO2, C3] [3 marks] [CO2, PO2, C3] By using the information given, estimate the heat transfer surface area on the inner side of the tube. [7 Marks] CO2, PO2, C3] If the double-pipe counter-flow heat exchanger is changed to 2-4 heat exchanger, calculate the new surface area needed for heat transfer. Assume all the properties is remaining same as above. [10 Marks]