deerslayersh
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- Mar 27, 2017
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"The net output power from a steam-based Rankine cycle is 250MW. The cycle has steam entering an isentropic condenser at 56°F and leaving as a saturated liquid at 93°F. The condenser pressure is 5psia. The mass flow rate of the steam is most nearby:"
My strategy:
Also, the temperature at the outlet of the condenser is provided as 93°F, which I am having trouble understanding as well. Shouldn't the temperature be constant as the heat reduction is attributed to the phase change?
My strategy:
- h1, s1 from superheat tables
- solve for quality, X, using s1=sf+Xsfg
- solve for h2
- h3=hf@5psia, v3=vf@5psia
- h4=h3+vf(P4-P3) (convert psi to psf, convert to Btu/lbm)
- W_turb - W-pump = 250MW = mdot(h1-h2) - mdot(h4-h2), (convert MW to Btu/hr),solve for mdot
Also, the temperature at the outlet of the condenser is provided as 93°F, which I am having trouble understanding as well. Shouldn't the temperature be constant as the heat reduction is attributed to the phase change?