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Indra Herlamba Siregar
Universitas Negeri Surabaya
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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ENERGI KONSERVASI PADA POMPA SENTRIFUGAL DENGAN TORQUE FLOW IMPELLER SEMI OPEN DAN CLOSED PADA PENGATURAN KAPASITAS Indra Herlamba Siregar
Otopro Vol 15 No 2 Mei 2020
Publisher : Jurusan Teknik Mesin Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/otopro.v15n2.p54-58

Abstract

Pumps are the most widely used rotating equipment in both the domestic and industrial sectors with a contribution of around 3% of the world's electrical energy usage, in addition to the size of pumps available with many incompatible requirements, it is necessary to regulate their capacity. In this article, there are two capacity setting methods tested, namely valve opening and variable speed drive on semi open and closed centrifugal pump torque flow impeller with blades of 7, 8 and 9. The results explain that in valve opening method the number of blades affects the power consumption pump electricity, although not significant enough, while the variable speed drive method, the number of blades has no effect. However, the power consumption of the impeller closed is lower than the semi open impeller in the valve opening method and there is no significant difference in the variable speed drive method. The capacity setting method with a variable speed drive consumes less electric power than the valve opening method, if the flow of pump more decrease from the initial condition the greater the savings obtained with the variable speed drive method than the valve opening method.
PENGARUH JUMLAH BILAH PENGARAH ANGIN JENIS OMNIDIRECTIONAL TERHADAP KINERJA MODEL TURBIN ANGIN SAVONIUS Indra Herlamba Siregar; Moch Effendy; Akhmad Hafidz Ainur Rasyid
Otopro Vol 18 No 2 Mei 2023
Publisher : Jurusan Teknik Mesin Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/otopro.v18n2.p65-70

Abstract

Recently, many countries are looking for alternative energy sources that are renewable and environmentally friendly, one of which is wind energy, with Indonesia's wind energy potential of 9 GW and relatively low wind speeds and geographical position, it is necessary to develop wind turbine technology that is suitable for wind characters in Indonesia. In this research, an omnidirectional wind director model (ODGV) is developed around the savonius wind turbine which aims to improve the performance of the savonius wind turbine model. The ODGV consists of several blades that function to direct the wind at 45o  counterclockwise, with the aim of accelerating the flow so as to increase the positive torque of the concave side blades and reduce the negative torque of the convex side blades of the savonius wind turbine model. An open-type wind tunnel was used to test the savonius wind turbine model with ODGVs. Five ODGVs were developed in this study, using 4, 6, 8, 12, and 16 directional blades with a width of 5cm. The data were analyzed using descriptive analysis. The results show that the ODGV can substantially improve the rotor performance, depending on the number of directional blades. The ODGV with 12 directional blades produced the greatest effect on the performance of the savonius wind turbine model at Re = 93269 which could increase the Cp 69.15% more than the savonius wind turbine model without ODGV. As the Reynolds number increases, the ODGV tends to significantly improve the performance of the savonius wind turbine model.
Co-Authors Akhmad Hafidz Ainur Rasyid Moch Effendy