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# hw_3 - Oil Water m h =1.5 kg/s C p,h = 2.25 kJkg-K T h,in =...

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MMAE 426, MMAE 522 Nuclear, Fossil-Fuel, and Sustainable Energy Systems 1 Homework 3, due Monday, Sept. 27 Reading assignment: Lienhardt, Chapter 3, “Heat Exchanger Design”, cont. Kenneth C. Weston, Chapter 2, 3, 10. ------------------------------------------------------------------------------------------------------------------ Problem 3.1 It is more advantageous to use the NTU method instead of the LMTD method when the surface (A, U), capacity rates (C c , C h ), and inlet temperatures (T c,in , T h,in) are specified. Let us reconsider the problem which was solved by a trial-and-error method in the class. Flow arrangement is counterflow.Stream of hot oil is cooled by a stream of cold water.
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Unformatted text preview: Oil Water m h =1.5 kg/s C p,h = 2.25 kJkg-K T h,in = ll0 C m c = 0.5 kg/s C p,c = 4.18 kJ/kg-K T c,in = 15 C The heat exchanger surface: A=10 m 2 ; U = 500 W/m 2-K. Determine the two outlet temperature s and the total stream-to-stream heat transfer rate Q . Problem 3.2 Propane (C 3 H 8 ) is a gas frequently used as a source of heat, e.g. for barbecue. Based on bond-breaking and bond-making, calculate the amount of energy released in kJ/mole, kJ/m3 and kJ/kg of fuel. Fill up the Table below, i.e., compare C 3 H 8 to methane, hydrogen and U235. kJ/kg kJ/mole kJ/m 3 C 3 H 8 CH 4 H 2 U-235 Note: U 235 + n → fission products + 2 or 3 n + ~200 MeV; 1 eV = 1.602 x 10-19 J [kg-m 2 /s 2 ]...
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