311309210-contoh-perhitungan-turbin-uap.xlsx

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uap masuk turbin : saturated steam P2 = 2000 kPa uap masuk kondenser : P3 = 7,5 kPa. air keluar kondenser : air jenuh P4 = 7,5 kPa air masuk boiler: P1 = 2000 kPa Diket

p2=p1 p3=p4

2000 kPa 7.5 kPa

Saat P = 2000 kPa (keluaran boiler) SL 2.4469 kj/kg K SV 6.3366 kj/kg K ΔS 3.8897 kj/kg K

hL hV Δh

908.589 kJ/kg 2797.2 kJ/kg 1888.611 kJ/kg

Apabila keadaan isentropis maka s2=s3 keluaran boiler yang digunakan adalah fasa uap, yakni S2v=S3 6.3366 kj/kg K h2v 2797.2 kJ/kg Pada saat p=7.5 kPa (keluaran turbin) p (kPa) VL hL hV sL sv 1 0.001 29.335 2514.4 0.106 8.9767 7.5 0.001007 146.6939 2565.244 0.498383 8.380433 10 1.01E-03 191.832 2584.8 0.6493 8.1511 Mencari kualitas uap x 0.740698 atau Mencari h3 h3 1938.109 kj/kg

74.07%

Q yang dibuang di kondensor 1791.415 kj/kg W pompa wp = vdp = 2.00689 kj/kg

h1

=

wp + h4L = 148.7008 kj/kg

Q boiler yang dibutuhkan 2648.499 kj/kg W turbin wT =

-859.091 kj/kg

Effisiensi sistem turbin uap Ƞ 0.323611 atau

32.36%

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