센겔 앤 볼스 열역학 5th 솔루션5-2
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센겔 앤 볼스 열역학 5th 솔루션입니다.
목차
Turbines and Compressors
본문내용
5-50 EES Problem 5-49 is reconsidered. The effect of the turbine exit pressure on the power output of the turbine as the exit pressure varies from 10 kPa to 200 kPa is to be investigated. The power output is to be plotted against the exit pressure.
Analysis The problem is solved using EES, and the solution is given below.
"Knowns "
T[1] = 450 [C]
P[1] = 10000 [kPa]
Vel[1] = 80 [m/s]
P[2] = 10 [kPa]
X_2=0.92
Vel[2] = 50 [m/s]
m_dot[1]=12 [kg/s]
Fluid$=`Steam_IAPWS`
*************0405060708*************30P[2] [kPa]T[2][C]
"Property Data"
h[1]=enthalpy(Fluid$,T=T[1],P=P[1])
h[2]=enthalpy(Fluid$,P=P[2],x=x_2)
T[2]=temperature(Fluid$,P=P[2],x=x_2)
v[1]=volume(Fluid$,T=T[1],p=P[1])
v[2]=volume(Fluid$,P=P[2],x=x_2)
"Conservation of mass: "
m_dot[1]= m_dot[2]
"Mass flow rate"
m_dot[1]=A[1]*Vel[1]/v[1]
m_dot[2]= A[2]*Vel[2]/v[2]
"Conservation of Energy - Steady Flow energy balance"
m_dot[1]*(h[1]+Vel[1]^2/2*Convert(m^2/s^2, kJ/kg)) = m_dot[2]*(h[2]+Vel[2]^2/2*Convert(m^2/s^2, kJ/kg))+W_dot_turb*convert(MW,kJ/s)
DELTAke=Vel[2]^2/2*Convert(m^2/s^2, kJ/kg)-Vel[1]^2/2*Convert(m^2/s^2, kJ/kg)
참고 자료
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