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Unformatted text preview: 8-70 [Also solved by EES Oil enclosed CD] Apressure raho ot~. J be air temperat\U"e at the turt>me eXIt, the net work output, ana the thermal emclencyare to be determined.ArllUJlPtion.r 1 Steady operating conditions exist. 2 The air-standard assumptions are applicable. 3 Kineticand potential energy changes are negligible. 4 Air is an ideal gas with variable specific heats.Propertkl The properties of air are given in Table A-I? .AIUIl]si.r (a) Noting that process 1-2s is isentropic,ht = 310.24kJ/kg7j = 310 K p: = 15546'1p; IP,. =--Lp,. =(8XI.SS46).12.44--+~ =~2.S8kJ/kg aDd Tb =SS7.25K1 P; IIhb -ht L L h2s -hI"- = --+ n.. = ~ +ratiop.P,. .-!.P,. .(8Xl.SS46)=12.~2 PI Ihlr - hw"C' --+ ~ =hw +.h2 -hw~ = 1 230.92kJ1'ka IT3=1160K--+p =207.2 I/',IP(I)". P :-!.p = - 207.2)-2,S.90 --+ 1t46/'~ P3 /', 8'7r ~ ~- ---+ 1t4 = ~ - '7r (It, -1t46)1t3 -1t46 _1'1n.0?-(n .'Y1'p r~T4 = 770.1 KThus,(b)q.. =~ -h2 =1230.92-646.7 =S84.2kJ,ikgq~ =h4 -ht = 789.16-310.24-478.92kJ/1W"".- -w.. -w. -.584.2-478.92-:w'7. '7....
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This note was uploaded on 01/13/2011 for the course MMAE EGN3343 taught by Professor Quanfangchen during the Spring '10 term at University of Central Florida.
- Spring '10