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# Quiz3 - 29 29 29 29 ε = q q = C T T C T T = C T T C T T...

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Fall 2007 1 ME 416 Computer Assisted Design of Thermal Systems Quiz #3 Closed Book, Closed Notes A concentric tube (double pipe), counterflow heat exchanger is used to heat kerosene flowing at 0.03 kg/s from 260 K to 330 K with air whose temperature changes from 380 K to 350 K. The kerosene has a c P of 2500 J/(kg K) and the air has a c P of 1000 J/(kg K). The overall heat transfer coefficient is 15 W/(m 2 K). Determine the required mass flow rate of air and the surface area of the heat exchanger.

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ME 416 CAD of Thermal Systems Fall 2007 2 Useful Equations Effectiveness
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Unformatted text preview: ( 29 ( 29 ( 29 ( 29 ε = q q = C T- T C T- T = C T- T C T- T act max H H,in H,out min H,in C,in C C,out C,in min H,in C,in & & Number of Transfer Units min C UA = NTU Heat Capacity Ratio C = C C R min max Heat Capacity P c m C & = Effectiveness Relations Concentric Tube, Counterflow ( 29 29 29 { } ( 29 29 29 { } ε = 1- exp - NTU 1 - C 1- C exp - NTU 1 - C R R R NTU Relations Concentric Tube, Counterflow ε ε 1-C 1-ln 1-C 1 = NTU R R Conservation of Energy ( 29 ( 29 (mc ) T- T = (mc ) T- T P C C,out C,in P H H,in H,out & &...
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Quiz3 - 29 29 29 29 ε = q q = C T T C T T = C T T C T T...

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