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• Muhammad Aditya

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Geankoplis hal 114 no. 2.7-5 Steam Boiler and Overiall Energy Balance. Liquid water under pressure at 150 kPa enters a boiler at 24oC through a pipe at an average velocity of 3.5 m/s in turbulent flow. The exit steam leaves at a height of 25 m above the liquid inlet at 150oC and 150 kPa absolute, and the velocity in the outlet line is 12.5 m/s in turbulent flow. The process is steady state. How much heat must be added per kg of steam?

BOILER P1 T1 V1

P2 T2 V2

Diketahui : H1 = 150 kPa, 24oC H1 = 100,70 kJ/kg o H2 = 150 kPa, 150 C H2 = 2746,5 kJ/kg V1 = 3,5 m/s ; Z1 = 0 V2 = 12,5 m/s ; Z2 = 25 m α = 1 (turbulent flow) Ws = 0 g = 9,80665 Ditanya : Q ..... ? Penyelesaian : Q – Ws = H2 - H1 + ½ α (V22 - V12 ) + (Z2 - Z1).g = (2746,5 – 100,70) kJ/kg + ½ (12,52 – 3,52) m2/s2 + (25 – 0) m . 9.80665 m/s2 = 2645,8 kJ/kg + ½ (156,25 – 12,25) m2/s2 + 245,16625 m2/s2 = 2645,8 x 103 J/kg + 72 m2/s2 + 245,16625 m2/s2 = 2646117,166 J/kg = 264,6117 x 104 J/kg

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Evry Rizqi Adzimah Fandi Lintang W.S Febrian Kusuma A. Herlinda Putri Laila Ratnasari Lailatul Jumiati F. Muh. Aditya Surya A

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