Thermodynamics

# Thermodynamics - {State 3 p3 = 2000{kPa x3 = 1...

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File:C:\Lei\courses\TA\4.122.EES 10/14/2011 10:57:53 AM Page 1 EES Ver. 8.874: #0171: For use by Students and Faculty in the Department of Mech. Engin., University of Maryland {4.122 A rigid tank having a volume of 0.1 m^3 initially contains water as a two-phase liquid-vapor mixture at 1 bar and a quality of 1%. The water is heated in two stages: Stage 1: Constant-volume heating until the pressure is 20 bar Stage 2; Continued heating while saturated water vapor is slowly withdrawn from the tank at a sconstant pressure of 20 bar. Heating ceases when all the water remaining in the tank is saturated vapor at 20 Bar. For the water, evaluate the heat transfer, in kJ, for each stage of heating. Ignore kinetic and potential energy effects.} {Given} V = 0.1 {m3} {State 1} p1 = 100 {kPa} x1 = 0.01 v1=Volume(Water,P=p1, x=x1) u1=IntEnergy(Water,P=p1, x=x1) m1 = V/v1 {State 2} p2 = 2000 {kPa} m2 = m1 v2 = v1 x2=Quality(Water,P=p2,v=v2) u2=IntEnergy(Water,P=p2, x=x2)

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Unformatted text preview: {State 3} p3 = 2000 {kPa} x3 = 1 v3=Volume(Water,P=p3, x=x3) u3=IntEnergy(Water,P=p3, x=x3) h3=Enthalpy(Water,P=p3, x=x3) m3 = V/v3 {Stage 1 close system} m1*(u2 - u1)=Q1 - W1 {energy balance equation} W1 = 0 {Stage 2 control volume} m3*u3 - m2*u2 = Q2 - (m2-m3)*h3 {energy balance equation} {Total heat transfer} Q_total = Q1+Q2 SOLUTION Unit Settings: SI C kPa kJ mass deg h3 = 2799 [kJ/kg] m1 = 5.558 [kg] m2 = 5.558 [kg] m3 = 1.004 [kg] p1 = 100 p2 = 2000 p3 = 2000 Q1 = 4209 [kJ] Q2 = 8711 [kJ] Q total = 12921 [kJ] u1 = 438.2 [kJ/kg] u2 = 1195 [kJ/kg] u3 = 2599 [kJ/kg] V = 0.1 [m 3 ] v1 = 0.01799 [m 3 /kg] v2 = 0.01799 [m 3 /kg] v3 = 0.09962 [m 3 /kg] W1 = 0 [kJ] x1 = 0.01 x2 = 0.1708 x3 = 1 File:C:\Lei\courses\TA\4.122.EES 10/14/2011 10:57:53 AM Page 2 EES Ver. 8.874: #0171: For use by Students and Faculty in the Department of Mech. Engin., University of Maryland No unit problems were detected....
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## This note was uploaded on 04/03/2012 for the course ENES 232 taught by Professor Hines during the Spring '12 term at Maryland.

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Thermodynamics - {State 3 p3 = 2000{kPa x3 = 1...

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