Question

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Problem 1 (50 points) For H2O, determine the specified property at the indicated state. Locate the state on a sketch of the T-v diagram. State 1: p=20MPa, 7-520 C. It's on a superheated, saturated or compressed state? Find specific volume v, in m²/kg, and specific internal energy u, in kJ/kg. State 2: p=20MPa, v=4.76792*10-3 m®/kg. It's on a superheated, saturated or compressed state? Find quality x, temperature T, in C, and specific internal energy u, in kJ/kg. State 3: p=10MPa, x=20%. It's on a superheated, saturated or compressed state? Find specific volume v, in m3/kg, temperature T, in C, and specific internal energy u, in kJ/kg. (Just show your answers, engineering methodology is not required.) Locate the state 1,2 and 3 on a sketch of the T-v diagram.

Answer 1

solution It we see saturated temperatur cor preenue tables the manimum temperature and pressure is 3746 and 22upa. but oun ginen valep are Perompe T25oc. so this must be a super heated state them From super heated steam tables at pz 20Mp4, Tassic AT v = 0.0 15530 m3/kg u= 2994-6138 kilka 06 -f-t f roupa super heceted - state Shri - 0.015350 remoly From suturated preckue tablep est pe compe vf = 0.00 1813 milleg ug = 0.00688qnitling but our gium specific volium is in betuem uf aud vg. soltat state must be a wet region. wote we know that vz vfthuly 0.0046792 - 0-001813 +160-00 5076) n=0-5821 Core 58.21%

Intern nal energy From steam tatile at parole of=1767-49 Kuilly , ufq2 749.24 keylla AT(c) U= 1767.19+0.5821 (749.24) wel regim U= 2203.64 2014pu Tc z 366.8 c 366 R -M20-5821 0:00476792 mileg my Palumpa, n2o.2 this muit directly drynees freetion is gireen so that be a saturated wet state Frou saturated freene tolle at pe rompe TT= 31.018 ufa 0:00 1452 milkg Ufz 1393.44 bolly vfgz 0.016622 milig ufqz lise. W lily ON VZ 0.001452+0.40.01664), [12000 47764 misling V20-00 4776

Иг ц{ thu 1 2 133-44-0--(-8 ) AT u= 1624.876 leilky wet gregies salumets HD [ o4 120- Т231-ог Н оооч16 шіlе