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Question 3.56: Reconsider Prob. 3.55. Using EES (or other) software, invest......

Reconsider Prob. 3.55. Using EES (or other) software, investigate the effect of pressure on the total mass of water in the tank. Let the pressure vary from 0.1 MPa to 1 MPa. Plot the total mass of water against pressure, and discuss the results. Also, show the process in Prob. 3.55 on a P-v diagram using the property plot feature of EES.

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EES Problem 3.55 is reconsidered. The effect of pressure on the total mass of water in the tank as the pressure varies from 0.1 MPa to 1 MPa is to be investigated. The total mass of water is to be plotted against pressure, and results are to be discussed.

Analysis The problem is solved using EES, and the solution is given below

P[1]=800 [kPa]
P[2]=P[1]
T[2]=350 [C]
V_f1 = 0.1 [m^3]
V_g1=0.9 [m^3]
spvsat_f1=volume(Steam_iapws, P=P[1],x=0) “sat. liq. specific volume, m^3/kg”
spvsat_g1=volume(Steam_iapws,P=P[1],x=1) “sat. vap. specific volume, m^3/kg”
m_f1=V_f1/spvsat_f1 “sat. liq. mass, kg”
m_g1=V_g1/spvsat_g1 “sat. vap. mass, kg”
m_tot=m_f1+m_g1
V[1]=V_f1+V_g1
spvol[1]=V[1]/m_tot “specific volume1, m^3”
T[1]=temperature(Steam_iapws, P=P[1],v=spvol[1])“C”
“The final volume is calculated from the specific volume at the final T and P”
spvol[2]=volume(Steam_iapws, P=P[2], T=T[2]) “specific volume2, m^3/kg”
V[2]=m_tot*spvol[2]
3-56
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\mathrm{M_{tot}} [Kg] \mathrm{P_1} [kPa]
96.39 100
95.31 200
94.67 300
94.24 400
93.93 500
93.71 600
93.56 700
93.45 800
93.38 900
93.34 1000

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