MECH 213 - 9.10.07

MECH 213 - 9.10.07 - MECH 213 Water 132C 78 quality find hf...

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Unformatted text preview: MECH 213 September 10, 2007 Water - 132C; 78% quality; find hf, hfg, hg Water 132 C 78% quality find hf, hfg, hg hf hfg 546.38 2173.7 567.75 2159.1 c a b d 130 132 135 a/b = c/d (132-130/135-130) = (hf 546.38)/(567.75 546.38) 21.37(2/5) + 546.38 = hf = 554.928 2/5 = (hfg 2173.7)/(2159.1 2173.7) hfg = 2167.86 h = 554.93 + (.78)(2167.86) = 2245.86 kJ/kg Superheated steam @ 550 F, 120psia Sat T1 T2 T3 550 120psia 341.25 v u h s x x x x Incompressible assumption v1u1s = f(T) only vliq ~ [email protected] uliq ~ [email protected] Enthalpy h = u + pv hliq [email protected] + (p [email protected])[email protected] 3-27 bold/italics are given T p (kPa) h Tsat = 120.21C 200 hf + xhfg = 140C psat = 1800 kJ/kg 361.53 hg = 2733 hf = 589 Tsat 950 hf 80 500 [email protected] + (p [email protected])[email protected] 350 800 3162.2 X = quality = 0 for a wet mixture x .70 x = (h-hf)/hfg 0 Undefined N/A Phase Wet mixture Wet mixture (in between hf and hg Saturated liquid compressed liquid (pressure intersects temperature line in compressed liquid region) Superheated vapor Draw TV diagram ...
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