This study has been employed experimentally towards Savonius water turbine by using Myring equation for n=1. This work will be varied to overlap ratio of 0, 0.05, 0.1, 0.15, 0.2, 0.25 and 0.3. The overlap ratio of 0 can be called as the conventional turbine using half circle. The experiment is tested in flume tank by 1.1 m of wide and 0.8 m of height and the water velocity 0.22 m/s. The turbine have 0.4 m of height and 0.4 of diameter. This work will be calculated the torque coefficient and the power coefficient. The power coefficient is called the performance coefficient. The results indicated that the best performance coefficient has improved in about 62.83 % at overlap ratio of 0.2.
Kapal LPD ( Landing Platfrom Dock ) adalah kapal yang berfungsi untuk keperluan militer. salah satu pembuat kapal LPD adalah PT. PAL INDONESIA (persero) di dalam membangun kapal terutama pada penentuan jumlah lampu di butuhkan akurasi yang baik dalam menentukanya lampu dalam hal ini PT. PAL INDONESIA (persero) menentukan jumlah lampu menggunakan perhitungan secara manual. Maka untuk merencanakan penerangan dengan mudah dibuatlah program perhitungan lampu menggunakan bantuan program Visual Basic. Program ini dibuat menggunakan perhitungan berdasarkan data yang diterapkan di PT. PAL INODNESIA (persero) dalam menggunakan program ini terdapat beberapa langkah seperti memasukkan dimensi ruangan, iluminasi, dan luminasi dengan demikian akan dapat di ketahui luas ruangan dan jumlah lampu yang di butuhkan berdasarkan tipe lampu yang sudah dipilih. Program ini dapat digunakan untuk menghitung jumlah lampu berdasarkan 2 class yaitu ABS dan BKI. Berdasarkan perhitungan program yang mengunakan 2 class dapat di ketahui ruangan yang mengunakan class ABS mempunyai jumlah lampu lebih banyak dibandingkan ruangan yang menggunakan class BKI. Program ini mempercepat perhitungan jumlah lampu dibandingkan perhitungan lampu mengunakan perhitungan secara manual. Kata Kunci: Landing Platfrom Dock, class, Visual Basic.
This work has been done experimentally to the Savonius water current turbine by means of Myring equation for n =1. The myring for n=2 is called the conventional turbine with half circle or bucket. Experiment is tested in flume tank by 1.1 m of wide and 0.8 m of height. The free stream velocity is 0.22 m/s measured at 1.5 m from nozzle. The model is the Myring equation with n=1 by 0.4 m of height and 0.4 m of turbine diameter. The experimental study has investigated the torque coefficient and the power coefficient. The power coefficient has been called the performance coefficient. The experimental results shows that the Myring formula n = 1 have the performance coefficient higher than the conventional blade. The myring blade for n = 1 increases in about 42.88 % compared to the conventional blade.
Polusi udara di pelabuhan berupa emisi adalah hal yang melatarbelakangi shore connection. Shore connection adalah distribusi tenaga listrik dari darat ke kapal yang digunakan selama kapal berlabuh di dermaga untuk memenuhi kebutuhan daya listrik di atas kapal, dan dalam kondisi mesin kapal dimatikan. Di Pelabuhan Tanjung Perak terdapat layanan shore connection berupa jaringan distribusi shore connection permanen dan jaringan distribusi shore connection portable. Di Terminal Jamrud Tanjung Perak sudah mulai mendapatkan permintaan layanan shore connection untuk 3 kapal, namun di Terminal Jamrud hanya terdapat 1 layanan shore connection portable. Untuk bisa memfasilitasi lebih banyak kapal dan membuat kerja sama dengan perusahaan pelayaran untuk layanan shore connection, maka diperlukan perancangan shore connection di Terminal Jamrud. Perancangan shore connection harus dipertimbangkan secara teknis instalasi antara shore connection permanen dan shore connection portable untuk diterapkan. Berdasarkan aspek teknis, perancangan shore connection permanen memungkinkan untuk diterapkan di Terminal Jamrud, dimana shore connection permanen mampu melayani kapasitas kapal berlabuh di Terminal Jamrud sebanyak 14 kapal, dan shore connection permanen dapat melayani kapal dengan frekuensi kelistrikan 50 Hz dan 60 Hz. Hasil perhitungan kebutuhan daya yang dibutuhkan untuk layanan shore connection di Terminal Jamrud adalah sebesar 4000 KVA.
A numerical study to reduce the condenser pressure in critical areas of a power plant surface condenser has been carried out. Numerically, effects are considered through a three-dimensional simulation approach. Modifying by adding a guide plate with a three variation of angle, (?) 15?, 30?, 45? in the surface condenser area to reduce the dynamic forces and pressure due to the collision of fluid flow in the critical pipeline without reducing the purpose of the design of shell and tube heat exchanger results in transferring heat. The drag force caused by the interaction of the shear layer with the surface of the body is very undesirable, so that the control of the flow fields is needed, one of which is by optimal angle guide plate of the pipe arrangement in the critical area. This study aims to determine the optimal plate angle to overcome high pressure in the critical area. This research was numerically conducted using 3D CFD ANSYS 14.5 software with a turbulence model using a standard k-? using a pressure-based solution solver. The initial stage takes geometric data on the surface condenser in the design specification as the basis for making the domain and data from before as boundary conditions in the simulation research process. The result is that with the addition of guide plates, the average drag coefficient (Cd) is reduced compared to the average Cd in the baseline conditions and angle variation (?) 15?, 30?, 45? is 0.537; 0.644; 0.446; 0.464. Taking into this aspect, the most optimal plate angle is 30?. The simulation results show that changing the angle of the plate can reduce the Nusselt value than the baseline conditions.
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