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ChBE 2110 Exam 1 Solution Fall 2007

ChBE 2110 Exam 1 Solution Fall 2007 - a...

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Unformatted text preview: a Aan“V.V.,m.mmmm.m....mu_wmmmmmm NAME S ”0L UT/ON ChBE 2110 Professor Gallivan, Fall 2007 Exam 1 _ Need to include conversion factors from front cover of text Need to include tables and charts: 0 gas tables for air, page 911 . o steam tables, 923,924 (saturated), 929 (superheated) * Problems adapted from Fundamentals of Engineering Thermodynamics, Howell and Buckius ' HQ (1) (25 pts) A steam turbine is designed to have a power output of 9 MW for a mass flow rate oft-7 -k-g/s.---The-in1et- state is-3- M?a; 450°C, and 2.00 -m/s;'---and th'e""outlet"state'is'0:5"‘ "" _.__...______.. MPa, saturated vapor, and 80 m/s. What is the heat transfer for this turbine? Lids: €9me ‘ 9x103 Ed _, “s“ : laid-'- 3 We. LIE” 4800C Q 1003?“ Eva “' (2) (25 pts) Two blocks A and B which are initially at 200 and 1000°F, respectively, are brought into contact and isolated from the surroundings. They are allowed to reach a final state of thermal equilibrium. Determine the entropy change of each block and of the isolated system. Block A IS aluminum (cp= 0 215 Btu/(Ham °R)) with mA— W“ 1 lbm, and block B 13 copper (cp— — 0 092 Btu/(lbm °R)) with m3: 2 lbm. Is this a reversible or an irreversible process? (Assume the density of the blocks is not dependent on temperature.) BW‘L W CP/ FEW $61.24 AULAH AUDI/J VAP mo it’d/«CW ()fprf’SSM/xi Assm col/1320M flYCSW W) mfg Wm, ' Cvfl'CP , ‘1 ark-0.219 E§m(fi - 20061:]; a ism-ongfif‘tfih‘ /000)6 7} S St; 9°F= /o 239% 0 « 9: 2:92. gnaw Adan/1% as: ‘2%)017+2~)O}$ Tag 7-05 - _ .7} :21 get/K AW d3 Magjflfiflhfl) Agfl ”Ea-mmC-gflémACmeth/ ‘W 235/532 tn :5: -0095: 222-. E56502: 5 ASg‘ m C 14%: 6411 [019 .4 Pg Q/ém-009ZMM‘K KM [if-6:6.) ”(L As As“ AS. = 0.031! 1% “cock/r 1K 915 5;“:an st ASmmso) M (3) (30 pts) Air is to be compressed isentropically from 1 atm and 20°C to a'final pressure of 20 atm. What is the temperature of the air leaving the compressor? ' (a) Assume ideal gas behavior and a constant value of cp = 7/2 R. (b) Use the attached gas tables for air. ea, (twiqpéifljifl‘g At 20‘61/9; : New :7? £96,,- 20%: .259 ff ,1» El— “ p/PWL; /Z99I 714900, 1 W 4304?“ 32377423248 *3) TIC: 40th? “c W..n2qu_._ux___._wwm»_.—W—mw_mm__gfl u (4) (20 pts) Consider the slow vaporization of water at 100 kPa Evaluate the change 1n entrOpy per unit mass, using the tabulated values of U, H, P, T, and V. (Then compare to the tabulated values of S.) . ‘ / 6‘ 0 £10k, HEN/fig) Wot dim WW ”4% w 0161 + Mud/T , ”Q (aw—aw led Fm fa/ML H13 W757 E Hvrae7SJ gnwa WAR, day-‘7! WWW Ada/Wm WWWW [WM J "E: [344' @ /(7C7M&LT 99;63&0C: 3728 K ...
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