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ThermoFinal

# ThermoFinal - University of Arizona Engrl11 K...

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Unformatted text preview: University of Arizona Engrl11 K: Thermodynamics Final Exam ‘Timelhours- Name [kl/h I Qng [1] A vapor—liquid mixture of water at 90'(' has a speciﬁc voiume of 05m" 1kg. Determine the quaﬁty of the mixture, the enthalpy and entropy. [10 pts] thaw wmcm V2775“ h "I. g —\( L - ‘ 006; k. v En 1'? \n 03 9 7/ h ’ "UL *— ’0“er h : Maw (191‘) @2331? h : ﬁSbJV “cl/U [2] me temperature and the pressure of air changes from 27‘C and 1.2 aim to l77‘('and 5.2 atm in a process. Calcu|ate the change in entropy. [15 pts] *2 , T c .- x v) if gout As, cpkn ,‘Mmgﬂ Cp A31 ‘ l T 7'1? L" T 7L1‘SC V I a A1 ’L “ _ MI 35.9 - a, a. 5-7- I ‘ Q\:\.7,m« A» whim) a: [5st (1: “Jam 13; : 2002>OL1 7 .151 p \éw V’ “x' L J v [3] Find approximate values for the ptoperties (speciﬁc volume, intemal energy, enthalpy and entropy of water at 47.5’C and ISOkPa. [15 pts] 95¢ L 1‘30 (FR VLL‘SN“; ' V1 HS” _ V - V: H5) LM‘mem WINK .\/= 30 'WS ‘17‘5’50 Iowan, .oelmo VA ,001010 £2 ‘ 2.3 .OCI‘OVL—‘OLHC‘O +_ 'Oclvl(\ 7.. ‘l\ {x '3 _ ‘ “N \/— WHO” Am v". U : U (80" ~ U “5" ‘5‘- _‘,_,L.——Lr- + UN” 7,- U : ’Zcq‘§?"3§°ﬂ L mzwﬂ L- \I .. 5 L. _ \“\2> \$55 ‘ ws I'm : 280‘53—5 iﬁégii + 7/ , . s r, \q i) 3 - (93\$7 E) _ _]° g2 ; in \$75.7 [4] a) Defne the oonpressed liquid states. smemeated vapor states. (5pts) b) Deﬁne the saturated liquid line. saturated vapor line and cn'ﬁcal point Locate them on the T-V diaphragm. (5pts) Or C0Mpfcs§£d \{cxwdy I (107 S-th; “‘3' pres’Swu. {S (5((03-(r *"lmm W Smhwcdr'ion (3R; W“ air ’HVLR. hmpzraJu/u i“ quiﬁhom‘ \ gm \» S *2111 E: u 9% N ALIA Vapor 5 Am « wkyu “Wu i’cmfmavhw 55 Ar Mn an MM Saki-afghan icmziwa W in Ex Sivan 9((SSM. o\(((LJ'(F‘ bu SCHVWQA “qu “M ’ Jobwc Im a JV’V &imo\ram ’ﬂmﬁ CLQQSLM: "1M b0 mackqu blrwm snail} 9mm qugk “mi A’WO 9km 'Ia’u,c‘x-Va.pcr donut. [5] For an isentropic process of an ideal gas (k=1.40), with an initial absolute pressure of 50 kPa. an initial speciﬁc volume of 7.5 mall), and a final pressure of 130 kPa. Find the ﬁnal value of the speciﬁc volume? [15 pts] A510 V‘s: \‘q PV K _A_ C O‘NE‘JV l. 1 Q ‘ t \I" I [6] What is entropy? Deﬁne itwith example. (5 points) 1m m Sylkm 61'4ch 3‘: QCOdLMJA WIN“ Cm Miami [{TeV((Sibx\i3ry is preynﬁi E‘T‘fopy woLJA be Pmdwwtd Ur a 295%“ we“ xv we kW 4T m guﬂouchRWS. v [7] A closed system initially at rest on the surface of the earth undergoes a prom for which there is a net energy transfer to the system by work of magnitude 200k! ‘ During the process there is a net transfer of energy from the system to its surroundings of3OIrJ . At the end of the process. the system has a veloa'ty of wm/s at an elevation of60m. The mass of the system is 25kg, and the local acceleration of gravity is g :9,75m/s3. Determine the change of rntemal energy of the system for the process. [15 pts] 46%., 4 Q'LL“ : ALI» L, are 2 APE \' —/ , I »/ Cry-cﬁgv‘b 10-100 : ALL 'r 4K5 "AH: ‘5 i V n1va mg“ I, ): 56¢: 1‘ Q A UV : G“ LU ‘ A K E ’ V \ i‘ I IZ‘J‘L‘UL EAL: — +7.00 ' (0' [7.3" \«1 /' w A, [8] A open feed water in a vapor power plant operates at steady state with liquid entering at inlet 1 with TI = 40"(.‘ and P, = 700kPa . Water vapor at T, 120017 and P2 =700kPa enter at inlet 2. Saturated iquid water exits with a pressure of P, - 700kl’a at outlet 3. Ignoring heat transfer with the surroundings and all kinetic and potential energy effects, determine the ratio ofmassﬂow rates, "'1, 1/51,. [15 pts] m (h ~ (h \ l"w \ dirt“)? 1 : Mural“ m “V1. 'r r“ -—- [mﬂlmzlhl Y\\l"h3 m I \____4 m (\yh‘ 7 Lrll~l ’7 r) . , Qﬁ ' rm 2 84°lt7~""’|7.3‘l J m1. MIW—lblﬂ V'r‘Ll-lmmf'f'kt"; —’ [£01734 K) m. ~-‘ =5” : L‘l .057 ...
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