HW9 spring 2011 solutions

# HW9 spring 2011 solutions - CHEG 2313 Thermo I HW#9 Spring...

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CHEG 2313 Thermo I HW#9 Spring 2011 Due Wednesday, April 13, 2011 in class. 1. A power plant using an ideal Rankine power generation cycle operates a boiler at a pressure of 500 bar with an outlet temperature of 800 ° C. The condenser produces saturated liquid water at 25 bar. Determine the following: a) The work produced by the turbine per kg. (3 pts) - start with energy balance around turbine ( 29 ( 29 1 2 1 2 ˆ ˆ ˆ ˆ H H M W H H M W T T - = - = - have enough information to determine enthalpy of steam at turbine inlet (H 1 ) ( 29 kg kJ MPa C H 6 . 3933 50 , 800 ˆ 1 = - to determine enthalpy at outlet of turbine (H 2 ) need to use entropy balance, which for reversible, adiabatic turbine means that process is isentropic (S 1 = S 2 ) ( 29 K kg kJ MPa C S * 5290 . 6 50 , 800 ˆ 1 = 4 1 2 3 P 4 = 50 MPa T 1 = 800 ° C P 1 = 50 MPa P 2 = 2.5 MPa P 2 = 2.5 MPa sat. liq. water

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( 29 K kg kJ MPa T S * 5209 . 6 5 . 2 , ˆ 2 2 = - from steam tables determine T 2 is just under 200°C, therefore using interpolation kg kJ H 0 . 2946 ˆ 2 = C T ° = 6 . 275 2 Sandler
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## This note was uploaded on 04/14/2011 for the course CHEG 2313 taught by Professor Staff during the Spring '11 term at Arkansas.

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HW9 spring 2011 solutions - CHEG 2313 Thermo I HW#9 Spring...

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