old Exam 3 solutions - Please! Be neat, write out equations...

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Unformatted text preview: Please! Be neat, write out equations before inserting numbers, and circle your answers. If you cannot figure out one part, assume an answer and carry iétthrfimgh the other parts. f5 6/ a ” : l. 534%) A sealed cylinder contains 1.5 kg of R1 345111321 volumeiof 0.02 m3 on one side of a frictionless piston and 0.3 kg oxygen (02) on the other side of the piston. Initially both fluids are at a temperature of 25°C. The R 134a then receives 1000 Id of heat from a reversible heat transfer reservoir at a temperature of 600°C after which the volume of the 02 is 1/2 its initial volume, compressed in a reversible process in which there is no heat transfer to/from the 02. Assume variable specific heats for the 02. 21) Find the final temperature of the oxygen (0C). b) Find the final pressure of the oxygen (kPa). ..‘. ..’..,1_.h,.!‘\ g; «u; u ‘ I ‘ l £7 0'2 ' d) Fin the final temperaturme C? 6) Find the entropy generation for this process Gel/K). Problem 1 continued jyle’JW-‘of O J C) m (WM) fifi’bx/ 0/ 3(ZS¥,7'"/74,Z) : w ‘7 fm:_{f/;05’/ ‘ a E 1 : _W{{/ 34:; 5 d) Wm; M44 I 27.05 [’3’ 7/ 3 UL + xCZ/V—IUV) : a 0/} 1;,0'005/42 '+ X! {’ 0265’.’ {56842) L720 «7114 (/{lzuLFXé/{V’UL} ’ M, : €0,944 flaw/243» ~ 7M4] : M} £9: *3 Q ,05 /5 mac/#43): 3C3? ‘ M J ’ ~ m T L7 Q a, [$3. 5 6/ _. I ' a 4‘4 C)? , #415 “W” 5% z 54 AQLL : 5 86/2“ go? - “tigfil 32/344 z I) j: /r . J Kl V69 FA : 20.30 : im/gsJ ’ - its. // 2. (31%) Steam enters a horizontal 6—inch diameter pipe as a saturated vapor at 20 psia with a velocity of 30 m/s and exits at a pressure of 14.7 psia and a quality of 95%. There is heat transfer to the surroundings which a& at 80°F. Determine: 1’ . a) The velocity at the exit of the pipe (fi/s) b 5 Q c. Jar)” The rate of entropy generation for the pipe and its surroundings. 20 ‘19 g 30"? (9 PM _ I» a (7: M? s f J15» gem/5 m Wiww ““““ “W_W-m X” R75“ x: i ., g? a) Qf'erqfir fluew+.¢5&6”wfl ” 25$éflm .37 ZF’% ,: Zcowrfif é? Zof’fiyié ‘ . /Lm —:’- h H; , 5 ’ Zoxfi4 / ANJ ; , Ag 5,1,5le \{r EXOA 7W:#i;-:0293:: 4 é 5 Up W . a6 “<[email protected]+ £3} > 0 : Q 4. 25!} (U55, + MW?) 2(3? 2) $167M”. O : + ‘Z7BE H543; ’ //OZ~O§j ff”: 5 fl) gm ,,,,,,,,,,,, Q +, L1+ZL1+X14 : /50,/r+,45(‘f70.3?)=//ot L (I/ Problem 2 continued D 5 P //C) J r ’ o ' W 7— .)Sl WM 4’ QM 24f If m “MSW .3:- + 5%” —/€.‘( ” (j 3 ’ 243[/,%3/7-/ QM] + 575— + g7?“ 5Mf< L L\/ 5+ X S : ,3/zz+-¢7§{/“/‘4’H)=‘ 6?? 3 3 3. (64%) Air at 100 kPa, 17°C is compressed to 400 kPa after which it is expanded through a nozzle back to the atmosphere at 100 kPa. The compressor and the nozzle both have efficiencies of 90% and the kinetic energy in/out of the compressor can be \ / 1" neglected. Assume constant specific heat for the air. Find: C,» Lao: we. 7M5; Z a) The actual compressor work (kJ/kg). [L b) The compressor exit temperature (0C). @l4 c) The actual nozzle exit velocity 4 0 d) Qualatatively sketch the process on a T-s diagram ‘ )Z 2' y L J1 jkfij ' flax/W [W © Problem 3 continued ' (j M: [w 71 «Z O :{%1+z}vfi:)v(%j 2/35 d 1,7325’; 4» /,oo§ d 560 / ->>/ x7; 7» S4/ W5 ‘ ...
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This note was uploaded on 01/27/2012 for the course ME 326 taught by Professor Schmidt during the Fall '07 term at University of Texas at Austin.

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old Exam 3 solutions - Please! Be neat, write out equations...

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