Download FE Thermo Review PDF

TitleFE Thermo Review
TagsHeat Thermodynamics Physics Physics & Mathematics
File Size1.2 MB
Total Pages58
Document Text Contents
Page 58

UNIVERSITY OF

FLORIDA

Thermodynamics

P

h

Consider a steam power plant and assume an
ideal Rankine cycle to model the system.

The steam enters the turbine at 3MPa and 350 C

Condenser pressure is at 75 kPa.

What is the thermal efficiency for this cycle?

th,Rankine = wnet/qin= (qin – qout)/qin

qin = h1 – h4

qout = h3-h2

h1 = h of superheated steam = 3115.3 kJ/kg

s1 = s2 = 6.7428 kJ/kg K

s2 = sf75kPa + x sfg75kPa = 6.7428 kJ/kg K

x = (6.7428-1.213)/6.2434 = 0.88

Using x and hf75kPa and hfg75kPa, we can calc.

h = 384.39+(0.88)(2278.6)= 2402.6 kJ/kg

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