Head Loss

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Tabel 1 Perhitungan Kehilangan Tinggi Tekan untuk keperluan Pembangkitan
RESUME PERHITUNGAN KEHILANGAN TINGGI TEKAN
1 Data Muka Air
Muka Air Normal
Muka Air Minimum
TWL
2 Gross Head
Maksimum Gross Head
Minimum Gross Head
Dipakai Gross Head Maksimum
3 Losses
Trashrack
Inlet Intake (Bellmouth)
Terowongan Miring
Belokan pada Primary Plug
Gradual Expansion pada Primary Plug
Terowongan Pengelak
Main Plugging, Kontraksi Gradual
Penstock
Losses pada bagian Bend
Bifurcation dengan Pembuang
Penstock antara Bifurcation 1 dan Bifurcation 2
Spherical Branch Losses, Bifurcation antara Unit 1
dan Unit 2
Penstock antara Bifurcation 2 dan sebelum
Pengecilan Pipa
Kontraksi Gradual dari Diameter 1.20m ke 0.80m
Main Inlet Valve & Fitting
Total Losses
4 Net Head
Net Head maksimum
Net Head minimum
Net Head rerata

119.80
92.50
65.50

dpl
dpl
dpl

54.30
27.00
40.65

m
m
m

0.02

m

0.01
0.01
0.00
0.06
0.15
0.00
0.24
0.02
0.06
0.06

m
m
m
m
m
m
m
m
m
m

1.60

m

0.10
0.00
0.21
2.33

m
m
m
m

51.97
24.67

m
m

51.97
m
Efisiensi Head
95.7%
Efisiensi Equipment
90.2%

a. Disain Parameter
Diameter Penstock
Net Head
Temperatur Lingkungan
Elevasi TWL

0.60 m
51.97 m (maksimum)
20.00 degrees
65.50 msl

Elevasi MAB pada Outlet

67.50 msl

Jumlah Turbine

2 buah

Debit Andalan per Unit turbine

2.50 m/det

Effiseinsi Turbin

90.00 %

Effiseinsi Generator

95.00 %

Kapasitas perunit pembangkit
Daya Terpasang (2 unit)

1,089.65 kW
2,179.31 kW (kapasitas Maksimum)

Prequensi generator

50.00 Hz

Daya turbine, (perunit turbine)

1,147.00 kW

Gambar 1 Pemilihan type Turbine berdasarkan Chart
b. Kecepatan Spesifik

NS 

n P(kW )
5
H4

Spesific Speed berdasarkan "Hydropower Engineering", C.C Warnick
Metode

Ns
0.5

USBR (1976), Ns = 2334 / H

0.5

Liderstrom KMW, Ns = 2000 / H

N
1,222.49

4.91 Francis

323.11

1,047.55

5.73 Francis

de Siervo and de Leva (1976), Ns = 3470355.40
/H
0.25

de Siervo and Lugaresi (1978), Ns = 85.4935.25
/H

Jumlah pole generator :

1,152.27

14.54
0.243

Pemilihan Kecepatan Sinkronisasi :

Type
Tubine

377.06
0.625

Liderstrom KMW, Ns = 90 / H

Np

5.21 Francis

47.14

127.28

Pelton

114.28

52.50

Pelton

750 rpm
8 poles

Actual Turbine Speed

750 rpm

Actual Spesific Speed

231 m-kW

OK

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