Perancangan turbin angin tipe Savonius dua tingkat dengan kapasitas 100 watt untuk gedung Syariah Hotel Solo.
PERANCANGAN TURBIN ANGIN TIPE SAVONIUS DUA TINGKAT
DENGAN KAPASITAS 100 WATT UNTUK GEDUNG
SYARIAH HOTEL SOLO
SKRIPSI
Diajukan sebagai salah satu syarat
untuk memperoleh gelar
Sarjana Teknik
Oleh:
Satriya Riskiyanto
NIM. I0411038
JURUSAN TEKNIK MESIN FAKULTAS TEKNIK
UNIVERSITAS SEBELAS MARET
2015
i
ii
iii
PERANCANGAN TURBIN ANGIN TIPE SAVONIUS DUA
TINGKAT DENGAN KAPASITAS 100 WATT
UNTUK GEDUNG SYARIAH HOTEL SOLO
Satriya Rizkiyanto
Jurusan Teknik Mesin, Fakultas Teknik, Universitas Sebelas Maret,
Surakarta, Indonesia
satriya.riskiyanto@gmail.com
Abstrak
Daerah perkotaan merupakan daerah yang memiliki tingkat konsumsi energi yang
tinggi dibandingkan dengan daerah perdesaan. Semakin meningkatnya kebutuhan
energi didaerah perkotaan akan meningkatkan pula kebutuhan energi. Kebutuhan
energi yang tidak diiringi dengan produksi energi akan mengakibatkan kelangkaan
energi. Upaya pemanfaatan energi yang ramah lingkungan dan terbarukan harus
dilakukan untuk mengatasi masalah tersebut. Salah satunya dengan memanfaatkan
turbin angin. Dalam skripsi ini akan dibahas mengenai perancangan turbin angin
tipe Savonius berkapasitas 100 Watt yang nantinya dapat digunakan untuk
produksi energi daerah perkotaan. Berdasarkan analisa hasil perhitungan
menggunakan fungsi distribusi Weibull, didapatkan kecepatan rata-rata pertahun
pada lokasi yaitu Gedung Syariah Hotel Solo sebesar 7,25 m/s. Nilai koefisien
daya (Cp) dan rasio kecepatan pada ujung sudu (λ) yang digunakan masingmasing sebesar 0,18 dan 1, sedangkan nilai rasio antara tinggi dan diameter turbin
(α) dan rasio jarak antara poros dan sudu (β) sebesar 2 dan 0,2. Dimensi luas
sapuan turbin didapat sebesar 2,37 m2. Jumlah sudu yang digunakan sebanyak dua
buah pada setiap tingkatnya. Sudu berbentuk semi circula r dengan diameter
sebesar 0,6 m dengan tinggi sebesar 1,076 m. Sehingga dimensi untuk tinggi (H)
dan diameter rotor (D) turbin sebesar 2,16 m dan 1,08 m.
Kata kunci : Daerah perkotaan; Energi terbarukan; Perancangan; Turbin angin;
Savonius
ix
DESIGN OF THE 100 WATT DOUBLE STAGE SAVONIUS
WIND TURBINE
FOR THE SYARIAH HOTEL SOLO
Satriya Rizkiyanto
Department of Mechanical Engineering, Faculty of Engineering, Sebelas Maret
University,
Surakarta, Indonesia
satriya.riskiyanto@gmail.com
Abstract
The urban area is an area that has a high level of energy consumption compared to
rural areas. Increasing the energy consumption in urban areas also increase the
energy needs. When energy needs is higher than energy production it causes
energy shortages. Applying green and renewable energy must be done to avoid
these problems. The use of wind turbines is a good choice. This paper discussed
how to design Savonius wind turbines with a capacity of 100 Watts that can be
used for energy production in urban areas. Based on the analysis results have been
carried out the annual mean speed at the location that is Syariah Hotel Solo is 7.25
m/s, the value of the power coefficient (Cp) and the tip speed ratio (λ) respectively
of 0.18 and 1, and the value of the aspect ratio (α) and the overlap ratio (β) of 2
and 0.2. The sweep area of the turbine obtained of 2.37 m2. The wind turbine use
double stage with two blades in each stage. The blades using a semi-circularshaped blade with blade diameter of the turbine is 0.6 m and the blade height is
1.076 m. So the dimensions for height (H) and diameter (D) of the turbine is 2.16
m and 1.08 m.
Keywords : Urban area; Renewable energy; Design; Wind turbine; Savonius
x
DAFTAR ISI
HALAMAN JUDUL ..................................................................................... i
HALAMAN SURAT PENUGASAN TUGAS AKHIR ................................... ii
HALAMAN PENGESAHAN ........................................................................ iii
HALAMAN PERNYATAAN KEASLIAN .................................................... iv
HALAMAN MOTTO ..................................................................................... v
HALAMAN PERSEMBAHAN ...................................................................... vi
KATA PENGANTAR ................................................................................... vii
ABSTRAK ..................................................................................................... ix
ABSTRACT ................................................................................................... x
DAFTAR ISI ................................................................................................. xi
DAFTAR TABEL .......................................................................................... xiv
DAFTAR GAMBAR ..................................................................................... xv
DAFTAR LAMPIRAN ................................................................................... xvii
DAFTAR NOTASI ......................................................................................... xviii
BAB I PENDAHULUAN ............................................................................... 1
1.1. Latar Belakang ................................................................................ 1
1.2. Rumusan Masalah ........................................................................... 2
1.3. Batasan Masalah .............................................................................. 2
1.4. Tujuan Penelitian ............................................................................. 3
1.5. Manfaat Penelitian............................................................................ 3
1.6. Sistematika Penulisan ...................................................................... 3
BAB II DASAR TEORI.................................................................................. 5
2.1. Tinjauan Pustaka .............................................................................. 5
2.2. Dasar Teori ...................................................................................... 6
2.2.1. Daya Dalam Energi Angin .................................................... 6
2.2.2. Distribusi Weibull Untuk Kecepatan Angin ........................... 8
2.2.3. Estimasi Energi Angin ........................................................... 9
2.2.4. Kecepatan Angin pada Gedung Bertingkat ............................ 10
2.2.5. Turbin Angin Savonius .......................................................... 14
2.2.6. Daya Turbin .......................................................................... 19
xi
2.2.7. Torsi...................................................................................... 20
2.2.8. Power Coefficient dan Tip Speed Ratio .................................. 21
2.2.9. Poros ..................................................................................... 22
2.2.10. Pasak ................................................................................... 24
2.2.11. Bantalan Atau Bearing ........................................................ 25
2.2.12. Basic Static Load Rating dan Dynamic Load Rating Pada
Bantalan .............................................................................. 27
2.2.13. Sistem Transmisi Daya ........................................................ 28
2.2.14. Sistem Konversi Energi ke Energi Listrik ............................ 28
2.2.15. Proses Perancangan ............................................................. 29
BAB III METODOLOGI PERANCANGAN .................................................. 32
3.1. Identifikasi Permasalahan ................................................................. 32
3.1.1. Latar Belakang dan Perumusan Masalah ............................... 32
3.1.2. Tujuan dan Manfaat .............................................................. 32
3.1.3. Studi Literatur ....................................................................... 32
3.2. Pengumpulan dan Pengolahan Data .................................................. 32
3.2.1. Pengumpulan Data Kecepatan Angin..................................... 33
3.2.2. Perhitungan Data Kecepatan Angin ....................................... 33
3.3. Perancangan Turbin Angin ............................................................... 33
3.3.1. Penetapan Fungsi dan Spesifikasi Turbin Angin Tipe
Savonius .............................................................................. 33
3.3.2. Pengembangan dan Pemilihan Konsep Turbin Angin ............ 33
3.3.3. Membuat Rancangan Turbin Angin ...................................... 34
3.3.4. Analisa dan Evaluasi Desain Turbin Angin ........................... 34
3.4. Kesimpulan dan Saran ..................................................................... 34
3.5. Diagram Alir Perancangan ............................................................... 34
BAB IV ANALISA DAN PERANCANGAN ................................................. 37
4.1. Potensi Kecepatan Angin.................................................................. 37
4.1.1. Tempat Penelitian ................................................................. 37
4.1.2. Perhitungan Data Kecepatan Angin....................................... 37
4.1.3. Perhitungan Kecepatan Angin di Lokasi Penelitian ............... 38
xii
4.1.4. Perhitungan kecepatan rata-rata angin dan standar deviasi di
lokasi .................................................................................... 40
4.1.5. Perhitungan fungsi probabilitas dan kumulatif distribusi
Weibull................................................................................ 41
4.1.6. Perhitungan Energi Angin ..................................................... 42
4.1.7. Penentuan Arah dan Kecepatan Angin Lokasi ....................... 43
4.2. Perancangan Turbin Angin ............................................................... 45
4.2.1. Perhitungan Dimensi Rotor ................................................... 46
4.3. Pemilihan Bantalan .......................................................................... 54
4.3.1. Analisa Gaya Pada Bantalan ................................................. 54
4.3.2. Penentuan Basic Static Load Rating dan Dynamic Load
Rating .................................................................................. 57
4.3.3. Pemilihan Bantalan ............................................................... 58
4.4. Perancangan Sistem Transmisi Turbin .............................................. 59
4.5. Pemilihan Generator ......................................................................... 61
4.6. Perancangan Rangka ........................................................................ 62
4.7. Prediksi Performa Turbin ................................................................. 65
4.7.1. Perhitungan Saat Kondisi Sta rt .............................................. 65
4.7.2. Perhitungan Saat Kondisi Charging ....................................... 66
4.7.3. Perhitungan Saat Kondisi Stop ............................................... 67
4.8. Perhitungan Annual Energy Turbin................................................... 68
BAB V KESIMPULAN DAN SARAN........................................................... 70
5.1. Kesimpulan ..................................................................................... 70
5.2. Saran ............................................................................................... 70
DAFTAR PUSTAKA .................................................................................... 72
LAMPIRAN .................................................................................................. 76
xiii
DAFTAR TABEL
Tabel 2.1. Klasifikasi daya angin .................................................................... 7
Tabel 2.2. Klasifikasi kecepatan angin ............................................................ 11
Tabel 2.3. Nilai koefisien kekasaran dan layer thickness berdasarkan lokasi
yang berbeda ................................................................................... 13
Tabel 2.4. Faktor Km dan Kt ........................................................................... 24
Tabel 2.5. Ukuran pasak berdasarkan diameter poros ...................................... 25
Tabel 2.6. Pemilihan faktor koreksi pada bantalan........................................... 28
Tabel 4.1. Hasil perhitungan kecepatan angin lokasi Januari 2013 ................... 38
Tabel 4.2. Frekuensi kecepatan angin pada tahun 2013 hingga tahun 2014 ...... 40
Tabel 4.3. Nilai safety factor ........................................................................... 48
Tabel 4.4. Dimensi bantalan 5208 ................................................................... 59
Tabel 4.5. Data teknik generator NE – 100S.................................................... 61
xiv
DAFTAR GAMBAR
Gambar 2.1. Profil kecepatan angin berdasarkan ketinggian ............................ 12
Gambar 2.2. Prinsip kerja rotor Savonius ........................................................ 14
Gambar 2.3. Turbin angin tipe Savonius dengan biaya rendah ......................... 15
Gambar 2.4. Aspect ratio ................................................................................ 16
Gambar 2.5. Grafik pengaruh end-plates terhadap performa turbin ................. 17
Gambar 2.6. Skema rotor Savonius, (a) pandangan depan; (b) pandangan atas 17
Gambar 2.7. Pengaruh overlap ratio ............................................................... 18
Gambar 2.8. Pengaruh jumlah sudu (a) Posisi angular terhadap momen; (b)
Pengaruh terhadap nilai Cp dan TSR .......................................... 18
Gambar 2.9. Turbin Savonius bertingkat ......................................................... 19
Gambar 2.10. Perbandingan koefisien daya dan tip speed ratio ....................... 22
Gambar 2.11. Pasak ....................................................................................... 24
Gambar 2.12. Radial ball bearing ................................................................... 26
Gambar 2.13. Proses perancangan berdasarkan Hampel .................................. 30
Gambar 3.1. Diagram alir metodologi perancangan ......................................... 35
Gambar 3.2. Diagram alir metodologi perancangan (lanjutan) ......................... 36
Gambar 4.1. Syariah Hotel Solo ...................................................................... 37
Gambar 4.2. Grafik fungsi distribusi Weibull (a) Distribusi probabilitas; (b)
Distribusi kumulatif .................................................................... 41
Gambar 4.3. Potensi energi angin .................................................................... 43
Gambar 4.4. Arah angin berdasarkan kecepatan angin ..................................... 44
Gambar 4.5. Frekuensi arah angin kumulatif .................................................. 44
Gambar 4.6. Hasil perhitungan nilai VEmax ...................................................... 45
Gambar 4.7. Analisa momen akibat gaya drag angin....................................... 49
Gambar 4.8. Pasak ......................................................................................... 51
Gambar 4.9. Dimensi rotor turbin (a) Tampak depan; (b) Tampak atas ........... 52
Gambar 4.10. Rotor turbin tipe Savonius 3D ................................................... 53
Gambar 4.11. Analisa gaya pada bantalan ....................................................... 54
Gambar 4.12. Bantalan bolt flange mounted bearing ...................................... 59
Gambar 4.13. Generator model NE – 100S ..................................................... 61
xv
Gambar 4.14. Rancangan rangka ..................................................................... 62
Gambar 4.15. Analisa gaya yang terjadi pada turbin ........................................ 63
Gambar 4.16. Gambar turbin angin tipe Savonius ........................................... 64
Gambar 4.17. Gambar 3D turbin angin tipe Savonius (a) Tampak depan; (b)
Tampak isometrik .................................................................... 65
Gambar 4.18. Prediksi daya output turbin Savonius ........................................ 68
Gambar 4.19. Faktor kapasitas berdasarkan kecepatan angin rata-rata ............. 69
Gambar 4.20. Energi tahunan .......................................................................... 69
xvi
DAFTAR LAMPIRAN
Lampiran 1. Tabel data kecepatan angin.......................................................... 77
Lampiran 2. Tabel hasil perhitungan VEmax perbulan ....................................... 89
Lampiran 3. Tabel hasil perhitungan pertahun ................................................. 89
Lampiran 4. Tabel hasil perhitungan arah angin .............................................. 89
Lampiran 5. Tabel standar ukuran pasak ......................................................... 90
Lampiran 6. Tabel standar ukuran bantalan ..................................................... 91
Lampiran 7. Tabel standar ukuran sabuk v ...................................................... 92
Lampiran 8. Ilustrasi peletakan turbin angin Savonius ..................................... 93
Lampiran 9. Nilai koefisien drag ..................................................................... 94
Lampiran 10. Tabel hasil perhitungan annual energy ...................................... 94
Lampiran 11. Tabel kekuatan material ............................................................ 95
Lampiran 12. Gambar 2D turbin angin tipe Savonius ...................................... 96
Lampiran 13. Gambar 2D end plate tengah ..................................................... 97
Lampiran 14. Gambar 2D end plate ................................................................ 98
Lampiran 15. Gambar 2D poros ...................................................................... 99
Lampiran 16. Gambar 2D sudu turbin angin .................................................... 100
Lampiran 17. Gambar 2D rangka .................................................................... 101
xvii
DAFTAR NOTASI
A
= Swept area rotor (m2)
N
= Putaran rotor (rpm)
ɑ
= Kekasaran permukaan
P
= Daya (Watt)
C
= Basic dynamic load rating (N)
ρ
= Massa jenis udara (kg/m3)
C0
= Basic static load rating (N)
Sy
= Yield strength (MPa)
CD
= Koefisien drag
Sf
= Faktor keamanan
CF
= Faktor kapasitas
T
= Torsi (Nm)
CP
= Koefisien performa turbin
Te
= Momen akibat torsi (Nm)
c
= Parameter skala Weibull (m/s)
v
= Kecepatan angin (m/s)
D
= Diameter rotor (m)
Vm
= Kecepatan angin rata-rata (m/s)
Df
= Diameter end-plates (m)
VEmax
= Kecepatan rerata tahunan (m/s)
d
= Diameter sudu (m)
VFmax
= Kecepatan terbanyak (m/s)
dp
= Diameter poros (m)
W
= Beban ekuivalen dinamik (N)
EA
= Energi tahunan (kWj/tahun)
WA
= Gaya aksial (N)
ED
= Densitas energi angin (kW/m2)
WR
= Gaya radial (N)
EI
= Intensitas energi (kW/m2/bulan)
X
= Faktor radial
e
= Overlap (m)
Y
= Faktor aksial
FD
= Gaya drag (N)
Zg
= Tebal lapis batas (m)
f
= Frekuensi
α
= Aspect ratio
g
= Percepatan gravitasi (m/s2)
β
= Overlap ratio
H
= Tinggi rotor (m)
KM
= Faktor beban akibat bending
KT
= Faktor beban akibat torsi
k
= Parameter bentuk Weibull
L
= Umur kerja bantalan (rev)
LH
= Waktu kerja bantalan (jam)
M
= Gaya momen (Nm)
Me
= Momen akibat bending (Nm)
= Tegangan tarik ijin (Mpa)
v
λ
= Standar deviasi (m/s)
= Tip speed ratio
= Tegangan geser ijin (MPa)
ω
xviii
= Kecepatan sudut (rad/s)
DENGAN KAPASITAS 100 WATT UNTUK GEDUNG
SYARIAH HOTEL SOLO
SKRIPSI
Diajukan sebagai salah satu syarat
untuk memperoleh gelar
Sarjana Teknik
Oleh:
Satriya Riskiyanto
NIM. I0411038
JURUSAN TEKNIK MESIN FAKULTAS TEKNIK
UNIVERSITAS SEBELAS MARET
2015
i
ii
iii
PERANCANGAN TURBIN ANGIN TIPE SAVONIUS DUA
TINGKAT DENGAN KAPASITAS 100 WATT
UNTUK GEDUNG SYARIAH HOTEL SOLO
Satriya Rizkiyanto
Jurusan Teknik Mesin, Fakultas Teknik, Universitas Sebelas Maret,
Surakarta, Indonesia
satriya.riskiyanto@gmail.com
Abstrak
Daerah perkotaan merupakan daerah yang memiliki tingkat konsumsi energi yang
tinggi dibandingkan dengan daerah perdesaan. Semakin meningkatnya kebutuhan
energi didaerah perkotaan akan meningkatkan pula kebutuhan energi. Kebutuhan
energi yang tidak diiringi dengan produksi energi akan mengakibatkan kelangkaan
energi. Upaya pemanfaatan energi yang ramah lingkungan dan terbarukan harus
dilakukan untuk mengatasi masalah tersebut. Salah satunya dengan memanfaatkan
turbin angin. Dalam skripsi ini akan dibahas mengenai perancangan turbin angin
tipe Savonius berkapasitas 100 Watt yang nantinya dapat digunakan untuk
produksi energi daerah perkotaan. Berdasarkan analisa hasil perhitungan
menggunakan fungsi distribusi Weibull, didapatkan kecepatan rata-rata pertahun
pada lokasi yaitu Gedung Syariah Hotel Solo sebesar 7,25 m/s. Nilai koefisien
daya (Cp) dan rasio kecepatan pada ujung sudu (λ) yang digunakan masingmasing sebesar 0,18 dan 1, sedangkan nilai rasio antara tinggi dan diameter turbin
(α) dan rasio jarak antara poros dan sudu (β) sebesar 2 dan 0,2. Dimensi luas
sapuan turbin didapat sebesar 2,37 m2. Jumlah sudu yang digunakan sebanyak dua
buah pada setiap tingkatnya. Sudu berbentuk semi circula r dengan diameter
sebesar 0,6 m dengan tinggi sebesar 1,076 m. Sehingga dimensi untuk tinggi (H)
dan diameter rotor (D) turbin sebesar 2,16 m dan 1,08 m.
Kata kunci : Daerah perkotaan; Energi terbarukan; Perancangan; Turbin angin;
Savonius
ix
DESIGN OF THE 100 WATT DOUBLE STAGE SAVONIUS
WIND TURBINE
FOR THE SYARIAH HOTEL SOLO
Satriya Rizkiyanto
Department of Mechanical Engineering, Faculty of Engineering, Sebelas Maret
University,
Surakarta, Indonesia
satriya.riskiyanto@gmail.com
Abstract
The urban area is an area that has a high level of energy consumption compared to
rural areas. Increasing the energy consumption in urban areas also increase the
energy needs. When energy needs is higher than energy production it causes
energy shortages. Applying green and renewable energy must be done to avoid
these problems. The use of wind turbines is a good choice. This paper discussed
how to design Savonius wind turbines with a capacity of 100 Watts that can be
used for energy production in urban areas. Based on the analysis results have been
carried out the annual mean speed at the location that is Syariah Hotel Solo is 7.25
m/s, the value of the power coefficient (Cp) and the tip speed ratio (λ) respectively
of 0.18 and 1, and the value of the aspect ratio (α) and the overlap ratio (β) of 2
and 0.2. The sweep area of the turbine obtained of 2.37 m2. The wind turbine use
double stage with two blades in each stage. The blades using a semi-circularshaped blade with blade diameter of the turbine is 0.6 m and the blade height is
1.076 m. So the dimensions for height (H) and diameter (D) of the turbine is 2.16
m and 1.08 m.
Keywords : Urban area; Renewable energy; Design; Wind turbine; Savonius
x
DAFTAR ISI
HALAMAN JUDUL ..................................................................................... i
HALAMAN SURAT PENUGASAN TUGAS AKHIR ................................... ii
HALAMAN PENGESAHAN ........................................................................ iii
HALAMAN PERNYATAAN KEASLIAN .................................................... iv
HALAMAN MOTTO ..................................................................................... v
HALAMAN PERSEMBAHAN ...................................................................... vi
KATA PENGANTAR ................................................................................... vii
ABSTRAK ..................................................................................................... ix
ABSTRACT ................................................................................................... x
DAFTAR ISI ................................................................................................. xi
DAFTAR TABEL .......................................................................................... xiv
DAFTAR GAMBAR ..................................................................................... xv
DAFTAR LAMPIRAN ................................................................................... xvii
DAFTAR NOTASI ......................................................................................... xviii
BAB I PENDAHULUAN ............................................................................... 1
1.1. Latar Belakang ................................................................................ 1
1.2. Rumusan Masalah ........................................................................... 2
1.3. Batasan Masalah .............................................................................. 2
1.4. Tujuan Penelitian ............................................................................. 3
1.5. Manfaat Penelitian............................................................................ 3
1.6. Sistematika Penulisan ...................................................................... 3
BAB II DASAR TEORI.................................................................................. 5
2.1. Tinjauan Pustaka .............................................................................. 5
2.2. Dasar Teori ...................................................................................... 6
2.2.1. Daya Dalam Energi Angin .................................................... 6
2.2.2. Distribusi Weibull Untuk Kecepatan Angin ........................... 8
2.2.3. Estimasi Energi Angin ........................................................... 9
2.2.4. Kecepatan Angin pada Gedung Bertingkat ............................ 10
2.2.5. Turbin Angin Savonius .......................................................... 14
2.2.6. Daya Turbin .......................................................................... 19
xi
2.2.7. Torsi...................................................................................... 20
2.2.8. Power Coefficient dan Tip Speed Ratio .................................. 21
2.2.9. Poros ..................................................................................... 22
2.2.10. Pasak ................................................................................... 24
2.2.11. Bantalan Atau Bearing ........................................................ 25
2.2.12. Basic Static Load Rating dan Dynamic Load Rating Pada
Bantalan .............................................................................. 27
2.2.13. Sistem Transmisi Daya ........................................................ 28
2.2.14. Sistem Konversi Energi ke Energi Listrik ............................ 28
2.2.15. Proses Perancangan ............................................................. 29
BAB III METODOLOGI PERANCANGAN .................................................. 32
3.1. Identifikasi Permasalahan ................................................................. 32
3.1.1. Latar Belakang dan Perumusan Masalah ............................... 32
3.1.2. Tujuan dan Manfaat .............................................................. 32
3.1.3. Studi Literatur ....................................................................... 32
3.2. Pengumpulan dan Pengolahan Data .................................................. 32
3.2.1. Pengumpulan Data Kecepatan Angin..................................... 33
3.2.2. Perhitungan Data Kecepatan Angin ....................................... 33
3.3. Perancangan Turbin Angin ............................................................... 33
3.3.1. Penetapan Fungsi dan Spesifikasi Turbin Angin Tipe
Savonius .............................................................................. 33
3.3.2. Pengembangan dan Pemilihan Konsep Turbin Angin ............ 33
3.3.3. Membuat Rancangan Turbin Angin ...................................... 34
3.3.4. Analisa dan Evaluasi Desain Turbin Angin ........................... 34
3.4. Kesimpulan dan Saran ..................................................................... 34
3.5. Diagram Alir Perancangan ............................................................... 34
BAB IV ANALISA DAN PERANCANGAN ................................................. 37
4.1. Potensi Kecepatan Angin.................................................................. 37
4.1.1. Tempat Penelitian ................................................................. 37
4.1.2. Perhitungan Data Kecepatan Angin....................................... 37
4.1.3. Perhitungan Kecepatan Angin di Lokasi Penelitian ............... 38
xii
4.1.4. Perhitungan kecepatan rata-rata angin dan standar deviasi di
lokasi .................................................................................... 40
4.1.5. Perhitungan fungsi probabilitas dan kumulatif distribusi
Weibull................................................................................ 41
4.1.6. Perhitungan Energi Angin ..................................................... 42
4.1.7. Penentuan Arah dan Kecepatan Angin Lokasi ....................... 43
4.2. Perancangan Turbin Angin ............................................................... 45
4.2.1. Perhitungan Dimensi Rotor ................................................... 46
4.3. Pemilihan Bantalan .......................................................................... 54
4.3.1. Analisa Gaya Pada Bantalan ................................................. 54
4.3.2. Penentuan Basic Static Load Rating dan Dynamic Load
Rating .................................................................................. 57
4.3.3. Pemilihan Bantalan ............................................................... 58
4.4. Perancangan Sistem Transmisi Turbin .............................................. 59
4.5. Pemilihan Generator ......................................................................... 61
4.6. Perancangan Rangka ........................................................................ 62
4.7. Prediksi Performa Turbin ................................................................. 65
4.7.1. Perhitungan Saat Kondisi Sta rt .............................................. 65
4.7.2. Perhitungan Saat Kondisi Charging ....................................... 66
4.7.3. Perhitungan Saat Kondisi Stop ............................................... 67
4.8. Perhitungan Annual Energy Turbin................................................... 68
BAB V KESIMPULAN DAN SARAN........................................................... 70
5.1. Kesimpulan ..................................................................................... 70
5.2. Saran ............................................................................................... 70
DAFTAR PUSTAKA .................................................................................... 72
LAMPIRAN .................................................................................................. 76
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DAFTAR TABEL
Tabel 2.1. Klasifikasi daya angin .................................................................... 7
Tabel 2.2. Klasifikasi kecepatan angin ............................................................ 11
Tabel 2.3. Nilai koefisien kekasaran dan layer thickness berdasarkan lokasi
yang berbeda ................................................................................... 13
Tabel 2.4. Faktor Km dan Kt ........................................................................... 24
Tabel 2.5. Ukuran pasak berdasarkan diameter poros ...................................... 25
Tabel 2.6. Pemilihan faktor koreksi pada bantalan........................................... 28
Tabel 4.1. Hasil perhitungan kecepatan angin lokasi Januari 2013 ................... 38
Tabel 4.2. Frekuensi kecepatan angin pada tahun 2013 hingga tahun 2014 ...... 40
Tabel 4.3. Nilai safety factor ........................................................................... 48
Tabel 4.4. Dimensi bantalan 5208 ................................................................... 59
Tabel 4.5. Data teknik generator NE – 100S.................................................... 61
xiv
DAFTAR GAMBAR
Gambar 2.1. Profil kecepatan angin berdasarkan ketinggian ............................ 12
Gambar 2.2. Prinsip kerja rotor Savonius ........................................................ 14
Gambar 2.3. Turbin angin tipe Savonius dengan biaya rendah ......................... 15
Gambar 2.4. Aspect ratio ................................................................................ 16
Gambar 2.5. Grafik pengaruh end-plates terhadap performa turbin ................. 17
Gambar 2.6. Skema rotor Savonius, (a) pandangan depan; (b) pandangan atas 17
Gambar 2.7. Pengaruh overlap ratio ............................................................... 18
Gambar 2.8. Pengaruh jumlah sudu (a) Posisi angular terhadap momen; (b)
Pengaruh terhadap nilai Cp dan TSR .......................................... 18
Gambar 2.9. Turbin Savonius bertingkat ......................................................... 19
Gambar 2.10. Perbandingan koefisien daya dan tip speed ratio ....................... 22
Gambar 2.11. Pasak ....................................................................................... 24
Gambar 2.12. Radial ball bearing ................................................................... 26
Gambar 2.13. Proses perancangan berdasarkan Hampel .................................. 30
Gambar 3.1. Diagram alir metodologi perancangan ......................................... 35
Gambar 3.2. Diagram alir metodologi perancangan (lanjutan) ......................... 36
Gambar 4.1. Syariah Hotel Solo ...................................................................... 37
Gambar 4.2. Grafik fungsi distribusi Weibull (a) Distribusi probabilitas; (b)
Distribusi kumulatif .................................................................... 41
Gambar 4.3. Potensi energi angin .................................................................... 43
Gambar 4.4. Arah angin berdasarkan kecepatan angin ..................................... 44
Gambar 4.5. Frekuensi arah angin kumulatif .................................................. 44
Gambar 4.6. Hasil perhitungan nilai VEmax ...................................................... 45
Gambar 4.7. Analisa momen akibat gaya drag angin....................................... 49
Gambar 4.8. Pasak ......................................................................................... 51
Gambar 4.9. Dimensi rotor turbin (a) Tampak depan; (b) Tampak atas ........... 52
Gambar 4.10. Rotor turbin tipe Savonius 3D ................................................... 53
Gambar 4.11. Analisa gaya pada bantalan ....................................................... 54
Gambar 4.12. Bantalan bolt flange mounted bearing ...................................... 59
Gambar 4.13. Generator model NE – 100S ..................................................... 61
xv
Gambar 4.14. Rancangan rangka ..................................................................... 62
Gambar 4.15. Analisa gaya yang terjadi pada turbin ........................................ 63
Gambar 4.16. Gambar turbin angin tipe Savonius ........................................... 64
Gambar 4.17. Gambar 3D turbin angin tipe Savonius (a) Tampak depan; (b)
Tampak isometrik .................................................................... 65
Gambar 4.18. Prediksi daya output turbin Savonius ........................................ 68
Gambar 4.19. Faktor kapasitas berdasarkan kecepatan angin rata-rata ............. 69
Gambar 4.20. Energi tahunan .......................................................................... 69
xvi
DAFTAR LAMPIRAN
Lampiran 1. Tabel data kecepatan angin.......................................................... 77
Lampiran 2. Tabel hasil perhitungan VEmax perbulan ....................................... 89
Lampiran 3. Tabel hasil perhitungan pertahun ................................................. 89
Lampiran 4. Tabel hasil perhitungan arah angin .............................................. 89
Lampiran 5. Tabel standar ukuran pasak ......................................................... 90
Lampiran 6. Tabel standar ukuran bantalan ..................................................... 91
Lampiran 7. Tabel standar ukuran sabuk v ...................................................... 92
Lampiran 8. Ilustrasi peletakan turbin angin Savonius ..................................... 93
Lampiran 9. Nilai koefisien drag ..................................................................... 94
Lampiran 10. Tabel hasil perhitungan annual energy ...................................... 94
Lampiran 11. Tabel kekuatan material ............................................................ 95
Lampiran 12. Gambar 2D turbin angin tipe Savonius ...................................... 96
Lampiran 13. Gambar 2D end plate tengah ..................................................... 97
Lampiran 14. Gambar 2D end plate ................................................................ 98
Lampiran 15. Gambar 2D poros ...................................................................... 99
Lampiran 16. Gambar 2D sudu turbin angin .................................................... 100
Lampiran 17. Gambar 2D rangka .................................................................... 101
xvii
DAFTAR NOTASI
A
= Swept area rotor (m2)
N
= Putaran rotor (rpm)
ɑ
= Kekasaran permukaan
P
= Daya (Watt)
C
= Basic dynamic load rating (N)
ρ
= Massa jenis udara (kg/m3)
C0
= Basic static load rating (N)
Sy
= Yield strength (MPa)
CD
= Koefisien drag
Sf
= Faktor keamanan
CF
= Faktor kapasitas
T
= Torsi (Nm)
CP
= Koefisien performa turbin
Te
= Momen akibat torsi (Nm)
c
= Parameter skala Weibull (m/s)
v
= Kecepatan angin (m/s)
D
= Diameter rotor (m)
Vm
= Kecepatan angin rata-rata (m/s)
Df
= Diameter end-plates (m)
VEmax
= Kecepatan rerata tahunan (m/s)
d
= Diameter sudu (m)
VFmax
= Kecepatan terbanyak (m/s)
dp
= Diameter poros (m)
W
= Beban ekuivalen dinamik (N)
EA
= Energi tahunan (kWj/tahun)
WA
= Gaya aksial (N)
ED
= Densitas energi angin (kW/m2)
WR
= Gaya radial (N)
EI
= Intensitas energi (kW/m2/bulan)
X
= Faktor radial
e
= Overlap (m)
Y
= Faktor aksial
FD
= Gaya drag (N)
Zg
= Tebal lapis batas (m)
f
= Frekuensi
α
= Aspect ratio
g
= Percepatan gravitasi (m/s2)
β
= Overlap ratio
H
= Tinggi rotor (m)
KM
= Faktor beban akibat bending
KT
= Faktor beban akibat torsi
k
= Parameter bentuk Weibull
L
= Umur kerja bantalan (rev)
LH
= Waktu kerja bantalan (jam)
M
= Gaya momen (Nm)
Me
= Momen akibat bending (Nm)
= Tegangan tarik ijin (Mpa)
v
λ
= Standar deviasi (m/s)
= Tip speed ratio
= Tegangan geser ijin (MPa)
ω
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= Kecepatan sudut (rad/s)