Elementary Principles 263 - 7.36 (cont'd) 0.4 0.3 0.2 0.1 0...

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7-18 7.36 (cont’d) 0 0.1 0.2 0.3 0.4 0 2 04 06 08 0 Pf (bar) y 0 50 100 150 200 250 300 1 5 10 15 20 25 30 36 39.8 60 Pf (bar) Tf (C) 7.37 10 m 3 , n moles of steam( v ), 275°C, 15 bar 10 m 3 , n moles of water ( v+l Q 1.2 bar, saturated 10.0 m 3 H 2 O ( v ) m in (kg) 275 o 10.0 m 3 m v [kg H 2 O ( v )] m l [kg H 2 O ( l )] (a) P =1.2 bar, saturated, C Table B.6 T 2 104 8 = . D (b) Total mass of water : m in 3 3 = 10 m kg 0.1818 m kg 1 55 = Mass Balance: Volume additivity: m m kg) m kg) kg, kg condensed 33 3 mm VV m m vl v l += = + ⇒= = 550 10 0 1428 0 001048 70 480 . .( . / ( . / .. (c) Table B.7 = 2739.2 kJ / kg; = 0.1818 m / kg Table B.6 = 439.2 kJ / kg; = 0.001048 m / kg = 2512.1 kJ / kg; =1.428 m / kg in in 3 3 3 R S | T | ±± UV ll vv ΔΔ Δ EEW pk QU m Um U ,, ± [( . ) ( . )( . in in 5 Energy balance: == (2512.1 kJ / kg) + ) - kg (2739.2)] kJ
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