Elementary Principles 259 - 7.29 250 kg H2 O(v )/min 40...

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7- 14 7.29 250 kg H O( )/min v 2 40 bar, 500°C H 1 ± (kJ/kg) Turbine W s =1500 kW 250 kg/min 5 bar, T 2 (°C), H 2 ± (kJ/kg) Heat exchanger Q (kW) 250 kg/min 5 bar, 500°C H 3 ± (kJ/kg) H O 40 bar, 500 C kJ kg 2 vH ,: ± °= bg 1 3445 (Table B.7) H O 5 bar, 500 C kJ kg 2 ± 3 3484 (Table B.7) (a) Energy balance on turbine: ΔΔ ² , ² , ² EQE pk == 00 0 Δ ²² ² ±± ² ² ² HWm HH W W m ss s =− = = 21 3445 1500 3085 di kJ kg kJ min 60 s s 250 kg 1 min kJ kg ± HP ° 3085 5 kJ kg and bars T = 310 C (Table B.7) (b) Energy balance on heat exchanger: s ² , ² , ² EW E 0 ² QH m = = Δ 32 250 3484 3085 1663 kg kJ 1 min 1 kW min kg 60 s 1 kJ / s kW (c) Overall energy balance: ² , ² EE =≅ Δ ²²² ² HQW mH H QW s =− ⇒ − =− 31 ² QHW s =+ = + =√ 250 3484 3445 1500 1663 kg kJ 1 min 1 kW min kg 60 s 1 kJ / s kJ 1 kW s1
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This note was uploaded on 02/27/2012 for the course CHEMICAL E 312 taught by Professor Cheung during the Fall '11 term at The University of Akron.

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