ch09 - 9-1 CHAPTER 9 SOLUTIONS9.1 To furnaceHeat

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 9-1 CHAPTER 9 SOLUTIONS9.1 To furnaceHeat lossesKmolcal9.61000CAir12700CB12 = H12 ToS12 =6.9 x (700 1000) 6.9 x 298 ln 1273973=-2,070 (-552) =-1,517.4 cal/mol 9-2 9.2 50 atm25C1 atm150CIdeal gasUse a two-step process isothermal compression followed by isobaric heating B=Bcomp+ Bheat=Hcomp - ToScomp+ Hheat ToSheat =0 (-298) x 1.987 ln501+ 7[(150 25) 298 ln298423] =2316.4 + 144.3 =2460.7 cal/mol 9-3 9.3 21350 psia250 psia500FH1=1264.7BtulbS1=1.5965RlbBtuS= 0.7For reversible operation: S2s= S1= 1.5965 Btu/(lbR) Interpolating in steam tables (between 550 and 600F) 9.12826.13109.12825801.16069.15801.15965.12s=H7.279.12826119.2s=HH2s=1282.9 + 17.0 = 1299.9 Btu/lb Ws= - (H2s H1) = -(1299.9 1264.7) = -35.2 Btu/lb Actual work W= 7.sW= -50.3 Btu/lb Conditions of Stream 2 H2= H1 W= 1264.7 + 50.3 = 1315.0 Btu/lb Interpolating (between 600 and 700F) 6069.16556.16069.16.13107.13646.1310.13152=S0487.6069.108133.2=SS2= 1.6069 + 0.0040 = 1.6109 Btu/(lbR) LW = -W - B 9-4 = -(-50.3) [(H2 ToS2) - (H1 ToS1)] = 50.3 [(H2 H1) To(S2 S1)] = 50.3 [50.3 537(1.6109 1.5965)] = 50.3 42.6 = 7.7 Btu/lb 85.7.76.426.42-GoalMain GoalMain T===LW9-5 9.4 Adiabatic=Q2400F70 psia100 lb/h1KW1.4elec=W200 psiaRlbBtu6951.1lbBtu.123211==SHFirst Law -lbBtu.1372.140.1232hrlb100JBtu054,1hr600,3100,4.12322elec12elec=+=+===HssJmWHHWQHmInterpolating, F5.6952=T( )RlbBtu/7218.12=Sa. WL= ( )elecWBm=[ ]elecWSTHmo=( )[ ]000,146951.17218.1537.140100+=000,1466.125100+=hrBtu434,1b. Main Goal = ( )hrBtu566,12=Bm()898.434,1566,12566,12==c.6951.11isen,2==SSInterpolating at 200 psia, 3.1342isen,2=H( )( )hrBtu1030.12323.13421001isen,2isen===HHmW074.000,14030,1elecisen===WWs9-6 9.5 hrBtu000,1=QB180FA200Fa. WL= ( )QTTQTTBoAo+11=( )( )000,1640660537640660=QTTTTTBAoBA= 25.4 Btu/hr b. WL= QTTToAB11BT1= 000047.0021277.10005374.2547011+=+=+QTWLToABT= F2.R8.459=F2.108.459470==ABT- compared with 20F 9-7 9.6 ( )[ ]( )[ ]( )( )( )[ ]molcal4.2593771621257K298173ln298298173Kmolcal7lnln----12121212==+=======mWTTTTTcmWTTcTTTcmSTHmSTHmBmWoppopoo9-8 9.7 ASPEN PLUS Flowsheet - simulation results can be reproduced using the file EXER9-7.bkp on the CD-ROM. ASPEN PLUS Program IN-UNITS ENG DEF-STREAMS CONVEN ALL DATABANKS PURE10 / AQUEOUS / SOLIDS / INORGANIC / & NOASPENPCD PROP-SOURCES PURE10 / AQUEOUS / SOLIDS / INORGANIC COMPONENTS BENZENE C6H6 BENZENE / TOLUENE C7H8 TOLUENE FLOWSHEET BLOCK M1 IN=1 2 OUT=3 PROPERTIES IDEAL STREAM 1 SUBSTREAM MIXED TEMP=100. PRES=1. <atm> MOLE-FLOW=1000. SUBSTREAM MIXED TEMP=100....
View Full Document

Page1 / 44

ch09 - 9-1 CHAPTER 9 SOLUTIONS9.1 To furnaceHeat

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online