Hot exhaust gases, which enter a finned-tube, cross-flow heat exchanger at 300°C and leave at 100°C, are used to heat pr

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Hot Exhaust Gases Which Enter A Finned Tube Cross Flow Heat Exchanger At 300 C And Leave At 100 C Are Used To Heat Pr 1 (266.45 KiB) Viewed 42 times

Hot exhaust gases, which enter a finned-tube, cross-flow heat exchanger at 300°C and leave at 100°C, are used to heat pressurized water at a flow rate of 1 kg/s from 35 to 125°C. The overall heat transfer coefficient based on the gas-side surface area is Un = 100 W/m².K. Determine the required gas-side surface area A, using the NTU method. SOLUTION Known: Inlet and outlet temperatures of hot gases and water used in a finned-tube, cross- flow heat exchanger. Water flow rate and gas-side overall heat transfer coefficient. Find: Required gas-side surface area. Schematic: TM Finned-tube, cross flow heat exchanger, Un - 100 W/m2.K Both fluids unmixed Whi - 300°C T Ta To - 1 kg's T= 125°C 7 = 100°C 7= 35°C The Assumptions: 1. Negligible heat loss to the surroundings and kinetic and potential energy changes. 2. Constant properties.