화공열역학 11장 연습문제
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- 2012.09.10
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화공열역학 11장 연습문제입니다.
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PROBLEMS
11.5. What is the work required for the separation of air (21-mol-% oxygen and 79-mol-% nitrogen) at 25℃ and 1 bar in a steady-flow process into product streams of the pure oxygen and nitrogen, also at 25℃ and 1 bar, if the thermodynamic efficiency of the process 5% and if T_σ=300K?
The General Energy Balance
(d(mU)_cv)/dt=-∆[(U+1/2 u^2+gz) m ̇ ]_fs+Q ̇+work rate
(d(mU)_cv)/dt=-∆[(U+1/2 u^2+gz) m ̇ ]_fs+Q ̇-∆[(PV) m ̇ ]_fs+(W_s ) ̇
(d(mU)_cv)/dt=-∆[(U+PV+1/2 u^2+gz) m ̇ ]_fs+Q ̇+(W_s ) ̇
(d(mU)_cv)/dt=-∆[(H+1/2 u^2+gz) m ̇ ]_fs+Q ̇+W ̇_S
(d(mU)_cv)/dt+∆[(H+1/2 u^2+gz) m ̇ ]_fs=Q ̇+W ̇_s
m=mass
U=internal energy
cv=constant volume
t=time
u=velocity
g=gravity acceleration
z=height
m ̇=rate of mass
fs=flow stream
Q ̇=rate of flow
W ̇_s=rate of shaft work
P=pressure
V=volume
H=enthalpy
The steady-flow process, d(mU)_cv=0
참고 자료
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