8/13/2019 Coimbained gas-steam Cycle.pdf

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8/13/2019 Coimbained gas-steam Cycle.pdf

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PROPRIETARY MATERIAL. 2011 The McGraw-Hill Companies, Inc. Limited distribution permitted only to teachers and educators for course

preparation. If you are a student using this Manual, you are using it without permission.

10-87

The net work outputs from each cycle are

kJ/kg2.275

K)2937.5725.8191373)(KkJ/kg1.005(

)()( 5687

inC,outT,cyclegasnet,

TTcTTc

www

pp

kJ/kg9.819

08.6)6.21276.2953(

)( inP,43

inP,outT,cyclesteamnet,

whh

www

An energy balance on the heat exchanger gives

aa

p

wwpa mm-hh

TTcm-hhmTTcm 1010.0

5.2576.2953

)6.5485.819)(005.1()()()(

23

98

2398

That is, 1 kg of exhaust gases can heat only 0.1010 kg of water. Then, the mass flow rate of air is

kg/s279.3

airkJ/kg)9.8191010.02.2751(

kJ/s000,100

net

net

w

Wma