Question

Tank A contains 50 kg of freon-12 at 0.5Mpa, at 20 C Tank B is initially empty. The valve is cracked open. The valve remains open. The process ends with both tanks in equilibrium at 0 C saturated vapor. Find the mass in each tank at the end, Q, change is s for tanks, change in sec for surrounding and for the universe, Wcv and Wrev.

300k A B TANK A CONTANS so ky of FREON -12 at Sara, 20°C TANK B is INITIALLY EMPTY. The VALUE is CRACKED OPEW. The VALVE REMAWS OPEN. The PROCESS ENDS With+ BON4 TANKS IN EMUILIBRIUM AT o'c, SATURATED VAPOR. FIND The masS IN EACH TANK At The EoD, Q, As for the tanks, as for the SURROUNDiwas (The surroun Diwas ReMAIN AT 300k), os for The UNVERSE, wov, Weer

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Answer 1

PAGE 2 * Solution Considering the figure conditions with schneles from the question zook A 15 Refsigerant freon 12 (8-12) TANK A. MAI sokg PAI=0.5.MP & ANAL P2 saturated repousine Tak 20C-2934. 0.30 86 mp? TANK-B Te o = 293K initially empty h2 187.39765) S2 = 0.6960 kJ/kg.K. le mbi okg, - At so.c.scturation Prs 0.56.73M, 29. but Palco SMPA

from ided gl Equation PAGE? So iR-RA is in repour state Enthelpi hi= 196.935 kg/kg Sie 0.6999 Kulky'x - In a osope closed system A1 2000 Erelgy equation oc fos 0338 rpg 2 So= duf sw. -0055380 m3/13 Vi=10035666ms 1kg. 40 h, -PV S. 186.935 -0.5813xo. 0355656 = 179 SETIS U2h 2 Pz Ve =;&7:38.1. 0.3086 X703 x 0. 05538 89 =170.3kJ/ks. PA, VA = MARTI sor 8.316 x 263 0.5 X VANNS 12.91 VA = 2015 m PA = P2 PALVA = m = 2T 2.

PAGE 3 =) 0:3086 X73?_2.015 = M12 x 8'314 120.91 * 243 MA= 3312kg MA2 mBz MA imiz 16.88 Kg on the control volume - Considering the valve Vole does not wook. h+ .hr MB2 Assuming Via Vs I velocity) Q = {m2-h; ) xmbi = (189.367.-196.935 ) »16.88 -1.60.984k) -ve means that is lost to sussanding -MA,S, AMA S2 ASA -50 x0.699 +33.12 70.686 79438 kg/ks > Enthelpy loss

PAGE 1 DSB = - mp, sit mb 282 -0 + 16-88 X0 696 Goch = +11.7485 15/18 -2 Ethiboy Entropy change of onivesse =DSA+AS + DS un = 0.346 kJ/k. As there is sudden expension through volve So no more work ;. e Wor=0 WRow=0 PLEASE UPVOTE for met * Ats vely mich neresely