Nowadays, gasoline is a kind of special fuel for the spark ignition engine, somehow it has bad ef... more Nowadays, gasoline is a kind of special fuel for the spark ignition engine, somehow it has bad effect on environment and also on economy. The effect on economy is reflected by government policy to import and to subsidize the fuel to meet the domestic market meet. For the environment, emission of degragates the quality of air. This research aims to overviews the influences of addition of hydroxy gas yielding by vortex type generator which later be injected to intake manifold to improve gasoline engine performance. Variation of ignition time is setup to be 100, 150 and 200 BTDC for the treatment. The result are to be compared to ignition time of pure gasoline as of 150 BTDC . Measured parameters are obtained by using Wide Open Throttle method.The impact of hydroxy gas injected to intake manifold at ignition time 200 BTDC gives and improvement power as much as 2-5% and efficiency at rate 5-15%
Nowadays, gasoline is a kind of special fuel for the spark ignition engine, somehow it has bad ef... more Nowadays, gasoline is a kind of special fuel for the spark ignition engine, somehow it has bad effect on environment and also on economy. The effect on economy is reflected by government policy to import and to subsidize the fuel to meet the domestic market meet. For the environment, emission of degragates the quality of
air. This research aims to overviews the influences of addition of hydroxy gas yielding by vortex type generator which later be injected to intake manifold to improve gasoline engine performance. Variation of ignition time is setup to be 100,, 150 and 200 BTDC for the treatment. The result are to be compared to ignition time of pure gasoline as of 150 BTDC . Measured parameters are obtained by using Wide Open Throttle method.The impact of hydroxy gas injected to intake manifold at ignition time 200 BTDC gives and improvement power as much as 2-5% and efficiency at rate 5-15%.
Electricity needs in Indonesia are not comparable with the capacity of the electricity produced b... more Electricity needs in Indonesia are not comparable with the capacity of the electricity produced by PLN. impact on energy crisis in some areas, For example, remote areas with no electricity network connectivity. Solutions, overcome the electricity crisis in remote areas with the use of hybrid renewable energy power plants. The research objective generating renewable energy power plants using solar cell and fuel cell. The result of the application of hybrid power plant applications, solar cell capacity of 300 watt and 20 watt fuel cell can produce electricity stored in batteries day and night. The power solar cell generated 1719.48 Watts/day and fuel cell for 7 hours can supply 360 watts.
This article proposes a model design of vertical axis wind turbine with blades hybrid is a combin... more This article proposes a model design of vertical axis wind turbine with blades hybrid is a combination of NACA 0018 airfoil profile blades and curve C with and without a guide vane tested with 4 Reynolds number in subsonic wind tunnel. Results of the study describes the addition of guide vane in the wind turbine model is able to improve the performance of wind turbine models significantly. The increase in performance compared to using the guide vane wind and without a guide vane in the condition of a maximum reach 150%, besides the addition of guide vane is able to improve self-starting wind turbine model.
Indonesia adalah negara yang terletak dikatulistiwa sehingga arah angin berubah ubah dengan kecep... more Indonesia adalah negara yang terletak dikatulistiwa sehingga arah angin berubah ubah dengan kecepatan angin rendah rata rata 2-6 m/s. Oleh karena itu perlu melakukan pengembangan turbin angin sumbu vertikal untuk mengubah energi angin menjadi energi mekanik berupa putaran poros yang digunakan memutar generator untuk menghasilkan energi listrik. Penelitian ini bertujuan untuk mengetahui pengaruh kombinasi bilah crossflow dan bilah savonius tipe J atau bilah hybrid dalam susunan dua tingkat terhadap kinerja yang dihasilkan turbin angin. Parameter penelitian merupakan variasi jumlah bilah crossflow sebesar 6, dan 12 sedangkan jumlah bilah savonius tipe J tetap yaitu 2. Hasil penelitian memaparkan bahwa kombinasi terbaik adalah jumlah bilah cross flow 12 dengan bilah Savonius tipe J pada kecepatan 6,21 m/s mampu menghasilkan daya listrik 20,36 Watt dengan tingkat effisiensi sebesar 7,08 %. Kata kunci: Energi angin, bilah cross flow, bilah savonius tipe J, Daya listrik danEfisiensi ABSTRACT Indonesia is a country located on the equator so that the direction of the wind changes with an average low wind speed of 2-6 m / s. Therefore it is necessary to develop vertical axis wind turbines to convert wind energy into mechanical energy in the form of rotation of the shaft used to rotate the generator to generate electrical energy. This study goals to determine the effect of crossflow blades and J type savonius blades or hybrid blades in a twostages arrangement of wind turbine performance. The research parameters were variations of number of cross flow blades of 6, and 12 while the number of fixed type J blades was 2. The results revealed that the best combination was the number of cross flow blades 12 with the Savonius Type J blade at a speed of 6.21 m / s capable of generating electrical power 20.36 Watt with efficiency 7.08%.
International Journal of Mechanical Engineering and Robotics Research, 2021
The savonius rotor is a vertical-axis wind turbine which operates according to the drag forces. I... more The savonius rotor is a vertical-axis wind turbine which operates according to the drag forces. It is widely used as equipment with the wind as a source of energy and has a simple design, it is easy to install, good starting ability, relatively low operating speed, and independent of wind direction. Several studies have been conducted in the last decade to improve the performance of this equipment with the focus on the aspect ratio, overlap ratio, and installing additional devices such as curtain design, deflector plate, guide box tunnel, and windshields. Swirling savonius rotor is an improvement on the savonius rotor with a gap between the concave and convex blades to reduce the negative torque generated by the convex blade. This present study was conducted to analyze the power coefficients, drag coefficients, and static torque of a swirling savonius rotor with omnidirectional guide vanes by measuring the pressure distribution on the blade surfaces at different rotor angles. The experiments were conducted at a Reynolds number of 1,1x10 5 with the rotor having two semi-circular blades, an overlap ratio of 0,2, and the number of omnidirectional guide vanes varied at 4, 8, 12, and 16. The results showed all the omnidirectional guide vanes except 16 increased the static torque and drag coefficients of the swirling savonius rotor.
International Journal of Advanced Science and Technology, 2020
In this study, an omnidirectional guide vane (ODGV) was developed surrounding a swirling savonius... more In this study, an omnidirectional guide vane (ODGV) was developed surrounding a swirling savonius rotor to increase the rotor performance. The ODGV consisted of several vanes which were to guide the air with a 45 deg counterclockwise direction. The design was to accelerate the flow to increase the positive torque of the advancing blade. An open type wind tunnel is used to test the wind turbine model to investigate how ODGV influences rotor performance. Five ODGV were developed in this study, employing 4, 6, 8, 12, and 16 guide vanes that were 5 cm in width. Results showed that ODGV can substantially increase the rotor performance, depending on the number of guide vanes. The ODGV with 12 blades on produced the largest effect on the rotor performance in Re = 93269 can increase Cp 69,15 % more than a swirling savonius rotor without ODGV. As increase Reynolds number effect ODGV tends to increase the rotor performance significantly.
ada sebagian ulama yang terpengaruh aliran mu'tazilah atau Asy'ariyah atau maturidiyah mentakwil ... more ada sebagian ulama yang terpengaruh aliran mu'tazilah atau Asy'ariyah atau maturidiyah mentakwil hadis ini dengan rahmatnya atau malaikatnya (karena menurut mereka secara aqal hal yg tidak mungkin karena setiap tempat malamnya tidak sama atau setiap malam ALLAH turun dari ArsyNYA ke langit dunia), sungguh memang hidayah itu mahal harganya hanya karena Ta'ashub (fanatic buta) pada tokoh-tokoh atau ulama yang tergelincir pemahamannya sampai-sampai pelajaran Bahasa arab dasar yg mereka pelajaripun dicampakkan jauh jauh kebelakang punggung-punggung mereka karena lafazd hadisnya jelas seperti tertulis diatas (yang diaris merahi (yanzilu rabbuna) yang dimana yanzilu adalah fiil mudhari yang artinya Fi'il Mudhari' adalah suatu kata kerja yang menunjukkan pekerjaan atau peristiwa yang sedang terjadi (present tense) dan peristiwa yang akan terjadi (future tense) yang menerangkan rabb (ALLAH) jadilah sangat tidak mungkin atau kalau dibicarakan secara kasar sangatlah konyol orang yang mentakwil rabbuna dengan rahmat atau malaikatnya. Begitu pula pada matan may yad'uni dimana ni disini kembalinya kepada rabbunna apakah mungkin rahmat ALLAH bisa berbicara atau lebih parah lagi jika mentakwilnya dengan malaikat sehingga secara tidak sengaja dia jatuh ke jurang kesyirikan karena di situ seakan akan malaikat bisa mengabulkan permohonan manusia, menerima taubatnya atau membrikan ampun sungguh itu bukan keyakinan seorang muslim Dalam ayat-ayat atau hadis tentang sifat ALLAH kita hanya di tuntut utk mengimaninya tidak dituntut mencari bagaimananya janganlah aqal kita liar untuk berfantasi sekali lagi cukup Imani karena khabar itu dari perkataan ALLAH sendiri atau shahih dari rasullullah dan ALLAH dan rasulNYA tidak mengkhabarkan kepada kita bagaimana caranya DIA turun ke langit bumi. Bukankah kita yakin ALLAH adalah rabb, yang DIA khabarkan kepada kita bahwa DIA berkuasa atas segala sesuatu albaqarah: 106 ٌ ير ِ د َ ق ٌ ء ْ َ َ ش ٌ ل ُ ك ٌ ى َ ل َ ع ٌ َ َ ٱّلل ٌ ن َ أ sesungguhnya Allah Maha Kuasa atas segala sesuatu.
Abstrak-Pompa adalah rotating equipment yang paling banyak digunakan baik disektor domestik maupu... more Abstrak-Pompa adalah rotating equipment yang paling banyak digunakan baik disektor domestik maupun industry dengan kontribusi pemakaian energi listrik dunia sekitar 3 %, selain itu ukuran pompa yang tersedia dengan kebutuhan banyak yang tidak sesuai sehingga perlu mengatur kapasitasnya. Pada artikel ini ada dua metoda pengaturan kapasitas yang diujikan yaitu dengan bukaan katup dan variable speed drive pada pompa sentrifugal torque flow impeller semi open dan closed dengan jumlah bilah 7, 8 dan 9. Hasil memaparkan bahwa pada metoda bukaan katup jumlah bilah berpengaruh terhadap konsumsi daya listrik pompa walaupun tidak cukup signifikan sedangkan pada metoda variable speed drive jumlah bilah tidak berpengaruh. Namun konsumsi daya listrik impeller closed lebih rendah daripada impeller semi open pada metoda bukaan katup dan tidak ada perbedaan yang signifikan pada metoda variable speed drive. Metoda pengaturan kapasitas dengan variable speed drive mengkonsumsi daya listrik yang lebih rendah daripada metoda bukaan katup semakin besar pengaturan aliran pompa dari kondisi awal semakin besar penghematan yang diperoleh dengan metoda variable speed drive daripada metoda bukaan katup. Kata Kunci-torque flow impeller, jumlah bilah, variable speed drive, bukaan katup. 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. Key Words-torque flow impeller, blade number, variable speed drive, valve opening. PENDAHULUAN Pompa digunakan untuk meningkatkan tekanan fluida menggunakan input daya dari motor atau mesin. Perawatan pompa komersial tersedia dalam berbagai ukuran, desain, dan kapasitas. Kinerja setiap pompa ditandai dengan peningkatan energi fluida atau head pompa, daya yang dibutuhkan untuk mengoperasikan pompa, dan efisiensi pompa. Ketiga parameter ini bervariasi sesuai dengan laju aliran fluida. Pengujian pompa akan mengungkapkan bagaimana head pompa, daya, dan efisiensi berbeda laju aliran. Hasil tes biasanya digunakan untuk menggambar kurva kinerja pompa, kinerja pompa sentrifugal dipengaruhi oleh desain bilah pompa, jumlah bilah dan bentuk geometris bilah [1]. Peningkatan jumlah bilah ternyata juga meningkatkan kinerja pompa sentrifugal baik dengan impeller konvensional [2-5] maupun impeller torque flow [6-7]. Pompa sentrifugal telah digunakan dalam aplikasi industri dan domestik, seperti pembangkit listrik tenaga uap, pabrik pasokan air, pembuangan limbah, drainase atau irigasi, kilang minyak, layanan tenaga hidrolik dan kapal. Fluida masuk ke pompa akibat rotasi impeller yang membuat efek isap lalu fluida mengambil energi dari impeller dalam bentuk energi dan tekanan kinetik [1]. Sistem pompa menyumbang hampir 2 s.d 3 % dari kebutuhan energi listrik dunia dengan kisaran 80 s.d 90 % dari porsi tersebut digunakan oleh motor listrik sebagai pengerak pompa [8]. Seiring meningkatnya biaya energi, pabrik pemrosesan meningkatkan fokus mereka pada jumlah energi yang dikonsumsi oleh rotating equipment. Selain itu
IOP Conference Series: Earth and Environmental Science, 2020
This article proposes a design model for vertical axis wind turbines based on drag forces by addi... more This article proposes a design model for vertical axis wind turbines based on drag forces by adding fix drag-reducing to the blades tested by subsonic wind tunnel with wind speeds of 3-6 m/s and opening angle variations of fix drag-reducing from 0, 15, 30 and 45 ο. The research explained that at the opening angle of 15 ο can improve the performance of the wind turbine model significantly at high wind speeds on the contrary for larger angle openings. The addition of fix drag-reducing instead reduces the performance of the wind turbine model considerably on all variations of wind speed tested. 1. Introduction Economic growth and high world population require energy sources, where according to the prediction of the international energy agency [1] in 2030, energy demand increased by 45%, and fossil energy use still dominates up to 80% of the world's energy needs. The use of fossil energy has a severe impact both from the source side where fossil energy is classified as unrenewable energy, as well as the effects of its use on humans related to the environment, where the use of fossil energy causes an increase in carbon emissions which is the main cause of the atmosphere's greenhouse effect which ultimately causes changes climate [2]. Renewable energy is a subject that is highly regarded throughout the world. Wind energy is one of the most promising renewable energy sources, many countries have explored and used wind energy because of pollution-free and the availability of abundant sources of wind energy for conversion where Indonesia according to PEU has wind energy potential of 9 GW with an average wind speed of 3 m/s up to 6.3 m/s [3]. There are two types of vertical axis wind turbines, namely the first type of drug commonly known as Savonius wind turbine, where these turbines work with different drag forces created on the side of the returning blade and advancing blades and the second is the type of lift commonly known as the Darrieus wind turbine, where this turbine works due to the lift force created in the blade [4]. Wind in Indonesia has variable characteristics because Indonesia's geographical position on the equator and its average wind speed are low [5] so that the development of a suitable type of wind turbine is the Savonius vertical axis wind turbine. The performance of Savonius wind turbines is influenced by many things, one of which is the shape of the blade geometry and flow parameters [6]. The influence of the number of blades on the savonius wind turbine has been examined [7-9], the results of their research explain that the number of blades on the savonius wind turbine has an impact on the performance of the turbine and the number of blades two which is the best amount of turbine performance.
Utilization of wind energy potential in Indonesia is still small due to the range of wind charact... more Utilization of wind energy potential in Indonesia is still small due to the range of wind characteristics in Indonesia frequently changing direction change and its average speed is also categorized low. For that we need to develop high-efficiency wind turbines at low wind speeds. In this research, a Savonius turbine model was developed as the main blade with 2 obstacle blades, the model was tested in a subsonic wind tunnel at wind speeds of 3-6 m / s with variations in the gap of the main and obstacle blades are 2, 4 and 6 cm. The results explained that at a gap of 6 cm, the presence of an obstacle blade can improve the performance of Savonius wind turbine models by 77.74% at a tip speed ratio of 0.88. In addition, the presence of obstacles can increase the ability of wind turbines to do self-starting.
Utilization of wind energy potential in Indonesia is still small due to the range of wind charact... more Utilization of wind energy potential in Indonesia is still small due to the range of wind characteristics in Indonesia frequently changing direction change and its average speed is also categorized low. For that we need to develop high-efficiency wind turbines at low wind speeds. In this research, a Savonius turbine model was developed as the main blade with 2 obstacle blades, the model was tested in a subsonic wind tunnel at wind speeds of 3-6 m / s with variations in the gap of the main and obstacle blades are 2, 4 and 6 cm. The results explained that at a gap of 6 cm, the presence of an obstacle blade can improve the performance of Savonius wind turbine models by 77.74% at a tip speed ratio of 0.88. In addition, the presence of obstacles can increase the ability of wind turbines to do self-starting.
Semakin meningkatnya tingkat kesejahteraan bangsa Indonesia, begitupula jumlah penduduknya menyeb... more Semakin meningkatnya tingkat kesejahteraan bangsa Indonesia, begitupula jumlah penduduknya menyebabkan semakin meningkat pula kebutuhan energi masyarakat Indonesia. BBM adalah jenis energi fosil yang dominan digunakan oleh masyarakat sehingga sebagai sumber energy utama, namun sifatnya tidak terbarukan dan dalam penggunaannya tidak ramah terhadap lingkungan. Pemenuhan kebutuhan energi kita mengimpor BBM dari luar selain itu kebijakan pemerintah yang memberikan subsidi BBM berdampak terhadap cadangn devisa bangsa Indonesia. Oleh karena itu diperlukan pengembangan dalam pemanfaatan energi alternatip selain BBM. Indonesia yang memiliki panjang pantai 80.000 km dan posisinya di garis katulistiwa memiliki potensi energi angin yang cukup besar yang karekteristik angin yang berubah-ubah, oleh karena itu penulis mengembangkan prototype turbin angin sumbu vertikal dua tingkat dengan bilah Modified NACA 0018 yang sesuai dengan karekteristik angin di Indonesia skala rumah tangga untuk membangkit listrik. Hasil pengujian memaparkan pada sudut pitch 60 0 karekteritik turbin yang dikembagnkan menurun dan hasil produksi listrik rata-rata per hari sebesar 672 Wh.
— This article proposes a model design of vertical axis wind turbine with blades hybrid is a comb... more — This article proposes a model design of vertical axis wind turbine with blades hybrid is a combination of NACA 0018 airfoil profile blades and curve C with and without a guide vane tested with subsonic wind tunnel for four Reynolds number. Results of the study describes the addition of guide vane in the wind turbine model is able to improve the performance of wind turbine models significantly. The increase in performance compared to using the guide vane wind turbine model without a guide vane on the maximum condition reached 150%, besides the addition of guide vane is able to improve self-starting wind turbine model.
The length of 80791.42 km coastline Indonesia is a potential area for the development of wi... more The length of 80791.42 km coastline Indonesia is a potential area for the development of wind energy with wind speeds average is generally between 3 m/s to 5 m/s, the total wind energy potential is estimated to reach 9 GW. However, the geographical Indonesia as a tropical country has characteristics of wind direction in Indonesia frequent changes, which condition is causing the sustainability of energy production from horizontal axis wind turbine rotor turbine disrupted due must always deal with the arrival of the wind direction. It required the design of the turbine according to the characteristics and the wind speed in Indonesia. In the present study to see the effect of adding wind deflector on the performance of vertical axis wind turbine models Darrieus type-H blades with NACA 0018 profile of the tested wind speed 2.86 m / s and 3.43 m / s and a pitch angle of 15 deg, 20 deg , 25 deg and 30 deg with a load of 200, 250 and 300 gr. The results presented that the addition of wind deflector can improve the performance of vertical axis wind turbines Darrius type-H in the form of 56.37% power turbine and turbine performance coefficient of 65.03% on the pitch angle 30 deg at wind speed 3.43 m / s
Nowadays, gasoline is a kind of special fuel for the spark ignition engine, somehow it has bad ef... more Nowadays, gasoline is a kind of special fuel for the spark ignition engine, somehow it has bad effect on environment and also on economy. The effect on economy is reflected by government policy to import and to subsidize the fuel to meet the domestic market meet. For the environment, emission of degragates the quality of air. This research aims to overviews the influences of addition of hydroxy gas yielding by vortex type generator which later be injected to intake manifold to improve gasoline engine performance. Variation of ignition time is setup to be 100, 150 and 200 BTDC for the treatment. The result are to be compared to ignition time of pure gasoline as of 150 BTDC . Measured parameters are obtained by using Wide Open Throttle method.The impact of hydroxy gas injected to intake manifold at ignition time 200 BTDC gives and improvement power as much as 2-5% and efficiency at rate 5-15%
Nowadays, gasoline is a kind of special fuel for the spark ignition engine, somehow it has bad ef... more Nowadays, gasoline is a kind of special fuel for the spark ignition engine, somehow it has bad effect on environment and also on economy. The effect on economy is reflected by government policy to import and to subsidize the fuel to meet the domestic market meet. For the environment, emission of degragates the quality of
air. This research aims to overviews the influences of addition of hydroxy gas yielding by vortex type generator which later be injected to intake manifold to improve gasoline engine performance. Variation of ignition time is setup to be 100,, 150 and 200 BTDC for the treatment. The result are to be compared to ignition time of pure gasoline as of 150 BTDC . Measured parameters are obtained by using Wide Open Throttle method.The impact of hydroxy gas injected to intake manifold at ignition time 200 BTDC gives and improvement power as much as 2-5% and efficiency at rate 5-15%.
Electricity needs in Indonesia are not comparable with the capacity of the electricity produced b... more Electricity needs in Indonesia are not comparable with the capacity of the electricity produced by PLN. impact on energy crisis in some areas, For example, remote areas with no electricity network connectivity. Solutions, overcome the electricity crisis in remote areas with the use of hybrid renewable energy power plants. The research objective generating renewable energy power plants using solar cell and fuel cell. The result of the application of hybrid power plant applications, solar cell capacity of 300 watt and 20 watt fuel cell can produce electricity stored in batteries day and night. The power solar cell generated 1719.48 Watts/day and fuel cell for 7 hours can supply 360 watts.
This article proposes a model design of vertical axis wind turbine with blades hybrid is a combin... more This article proposes a model design of vertical axis wind turbine with blades hybrid is a combination of NACA 0018 airfoil profile blades and curve C with and without a guide vane tested with 4 Reynolds number in subsonic wind tunnel. Results of the study describes the addition of guide vane in the wind turbine model is able to improve the performance of wind turbine models significantly. The increase in performance compared to using the guide vane wind and without a guide vane in the condition of a maximum reach 150%, besides the addition of guide vane is able to improve self-starting wind turbine model.
Indonesia adalah negara yang terletak dikatulistiwa sehingga arah angin berubah ubah dengan kecep... more Indonesia adalah negara yang terletak dikatulistiwa sehingga arah angin berubah ubah dengan kecepatan angin rendah rata rata 2-6 m/s. Oleh karena itu perlu melakukan pengembangan turbin angin sumbu vertikal untuk mengubah energi angin menjadi energi mekanik berupa putaran poros yang digunakan memutar generator untuk menghasilkan energi listrik. Penelitian ini bertujuan untuk mengetahui pengaruh kombinasi bilah crossflow dan bilah savonius tipe J atau bilah hybrid dalam susunan dua tingkat terhadap kinerja yang dihasilkan turbin angin. Parameter penelitian merupakan variasi jumlah bilah crossflow sebesar 6, dan 12 sedangkan jumlah bilah savonius tipe J tetap yaitu 2. Hasil penelitian memaparkan bahwa kombinasi terbaik adalah jumlah bilah cross flow 12 dengan bilah Savonius tipe J pada kecepatan 6,21 m/s mampu menghasilkan daya listrik 20,36 Watt dengan tingkat effisiensi sebesar 7,08 %. Kata kunci: Energi angin, bilah cross flow, bilah savonius tipe J, Daya listrik danEfisiensi ABSTRACT Indonesia is a country located on the equator so that the direction of the wind changes with an average low wind speed of 2-6 m / s. Therefore it is necessary to develop vertical axis wind turbines to convert wind energy into mechanical energy in the form of rotation of the shaft used to rotate the generator to generate electrical energy. This study goals to determine the effect of crossflow blades and J type savonius blades or hybrid blades in a twostages arrangement of wind turbine performance. The research parameters were variations of number of cross flow blades of 6, and 12 while the number of fixed type J blades was 2. The results revealed that the best combination was the number of cross flow blades 12 with the Savonius Type J blade at a speed of 6.21 m / s capable of generating electrical power 20.36 Watt with efficiency 7.08%.
International Journal of Mechanical Engineering and Robotics Research, 2021
The savonius rotor is a vertical-axis wind turbine which operates according to the drag forces. I... more The savonius rotor is a vertical-axis wind turbine which operates according to the drag forces. It is widely used as equipment with the wind as a source of energy and has a simple design, it is easy to install, good starting ability, relatively low operating speed, and independent of wind direction. Several studies have been conducted in the last decade to improve the performance of this equipment with the focus on the aspect ratio, overlap ratio, and installing additional devices such as curtain design, deflector plate, guide box tunnel, and windshields. Swirling savonius rotor is an improvement on the savonius rotor with a gap between the concave and convex blades to reduce the negative torque generated by the convex blade. This present study was conducted to analyze the power coefficients, drag coefficients, and static torque of a swirling savonius rotor with omnidirectional guide vanes by measuring the pressure distribution on the blade surfaces at different rotor angles. The experiments were conducted at a Reynolds number of 1,1x10 5 with the rotor having two semi-circular blades, an overlap ratio of 0,2, and the number of omnidirectional guide vanes varied at 4, 8, 12, and 16. The results showed all the omnidirectional guide vanes except 16 increased the static torque and drag coefficients of the swirling savonius rotor.
International Journal of Advanced Science and Technology, 2020
In this study, an omnidirectional guide vane (ODGV) was developed surrounding a swirling savonius... more In this study, an omnidirectional guide vane (ODGV) was developed surrounding a swirling savonius rotor to increase the rotor performance. The ODGV consisted of several vanes which were to guide the air with a 45 deg counterclockwise direction. The design was to accelerate the flow to increase the positive torque of the advancing blade. An open type wind tunnel is used to test the wind turbine model to investigate how ODGV influences rotor performance. Five ODGV were developed in this study, employing 4, 6, 8, 12, and 16 guide vanes that were 5 cm in width. Results showed that ODGV can substantially increase the rotor performance, depending on the number of guide vanes. The ODGV with 12 blades on produced the largest effect on the rotor performance in Re = 93269 can increase Cp 69,15 % more than a swirling savonius rotor without ODGV. As increase Reynolds number effect ODGV tends to increase the rotor performance significantly.
ada sebagian ulama yang terpengaruh aliran mu'tazilah atau Asy'ariyah atau maturidiyah mentakwil ... more ada sebagian ulama yang terpengaruh aliran mu'tazilah atau Asy'ariyah atau maturidiyah mentakwil hadis ini dengan rahmatnya atau malaikatnya (karena menurut mereka secara aqal hal yg tidak mungkin karena setiap tempat malamnya tidak sama atau setiap malam ALLAH turun dari ArsyNYA ke langit dunia), sungguh memang hidayah itu mahal harganya hanya karena Ta'ashub (fanatic buta) pada tokoh-tokoh atau ulama yang tergelincir pemahamannya sampai-sampai pelajaran Bahasa arab dasar yg mereka pelajaripun dicampakkan jauh jauh kebelakang punggung-punggung mereka karena lafazd hadisnya jelas seperti tertulis diatas (yang diaris merahi (yanzilu rabbuna) yang dimana yanzilu adalah fiil mudhari yang artinya Fi'il Mudhari' adalah suatu kata kerja yang menunjukkan pekerjaan atau peristiwa yang sedang terjadi (present tense) dan peristiwa yang akan terjadi (future tense) yang menerangkan rabb (ALLAH) jadilah sangat tidak mungkin atau kalau dibicarakan secara kasar sangatlah konyol orang yang mentakwil rabbuna dengan rahmat atau malaikatnya. Begitu pula pada matan may yad'uni dimana ni disini kembalinya kepada rabbunna apakah mungkin rahmat ALLAH bisa berbicara atau lebih parah lagi jika mentakwilnya dengan malaikat sehingga secara tidak sengaja dia jatuh ke jurang kesyirikan karena di situ seakan akan malaikat bisa mengabulkan permohonan manusia, menerima taubatnya atau membrikan ampun sungguh itu bukan keyakinan seorang muslim Dalam ayat-ayat atau hadis tentang sifat ALLAH kita hanya di tuntut utk mengimaninya tidak dituntut mencari bagaimananya janganlah aqal kita liar untuk berfantasi sekali lagi cukup Imani karena khabar itu dari perkataan ALLAH sendiri atau shahih dari rasullullah dan ALLAH dan rasulNYA tidak mengkhabarkan kepada kita bagaimana caranya DIA turun ke langit bumi. Bukankah kita yakin ALLAH adalah rabb, yang DIA khabarkan kepada kita bahwa DIA berkuasa atas segala sesuatu albaqarah: 106 ٌ ير ِ د َ ق ٌ ء ْ َ َ ش ٌ ل ُ ك ٌ ى َ ل َ ع ٌ َ َ ٱّلل ٌ ن َ أ sesungguhnya Allah Maha Kuasa atas segala sesuatu.
Abstrak-Pompa adalah rotating equipment yang paling banyak digunakan baik disektor domestik maupu... more Abstrak-Pompa adalah rotating equipment yang paling banyak digunakan baik disektor domestik maupun industry dengan kontribusi pemakaian energi listrik dunia sekitar 3 %, selain itu ukuran pompa yang tersedia dengan kebutuhan banyak yang tidak sesuai sehingga perlu mengatur kapasitasnya. Pada artikel ini ada dua metoda pengaturan kapasitas yang diujikan yaitu dengan bukaan katup dan variable speed drive pada pompa sentrifugal torque flow impeller semi open dan closed dengan jumlah bilah 7, 8 dan 9. Hasil memaparkan bahwa pada metoda bukaan katup jumlah bilah berpengaruh terhadap konsumsi daya listrik pompa walaupun tidak cukup signifikan sedangkan pada metoda variable speed drive jumlah bilah tidak berpengaruh. Namun konsumsi daya listrik impeller closed lebih rendah daripada impeller semi open pada metoda bukaan katup dan tidak ada perbedaan yang signifikan pada metoda variable speed drive. Metoda pengaturan kapasitas dengan variable speed drive mengkonsumsi daya listrik yang lebih rendah daripada metoda bukaan katup semakin besar pengaturan aliran pompa dari kondisi awal semakin besar penghematan yang diperoleh dengan metoda variable speed drive daripada metoda bukaan katup. Kata Kunci-torque flow impeller, jumlah bilah, variable speed drive, bukaan katup. 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. Key Words-torque flow impeller, blade number, variable speed drive, valve opening. PENDAHULUAN Pompa digunakan untuk meningkatkan tekanan fluida menggunakan input daya dari motor atau mesin. Perawatan pompa komersial tersedia dalam berbagai ukuran, desain, dan kapasitas. Kinerja setiap pompa ditandai dengan peningkatan energi fluida atau head pompa, daya yang dibutuhkan untuk mengoperasikan pompa, dan efisiensi pompa. Ketiga parameter ini bervariasi sesuai dengan laju aliran fluida. Pengujian pompa akan mengungkapkan bagaimana head pompa, daya, dan efisiensi berbeda laju aliran. Hasil tes biasanya digunakan untuk menggambar kurva kinerja pompa, kinerja pompa sentrifugal dipengaruhi oleh desain bilah pompa, jumlah bilah dan bentuk geometris bilah [1]. Peningkatan jumlah bilah ternyata juga meningkatkan kinerja pompa sentrifugal baik dengan impeller konvensional [2-5] maupun impeller torque flow [6-7]. Pompa sentrifugal telah digunakan dalam aplikasi industri dan domestik, seperti pembangkit listrik tenaga uap, pabrik pasokan air, pembuangan limbah, drainase atau irigasi, kilang minyak, layanan tenaga hidrolik dan kapal. Fluida masuk ke pompa akibat rotasi impeller yang membuat efek isap lalu fluida mengambil energi dari impeller dalam bentuk energi dan tekanan kinetik [1]. Sistem pompa menyumbang hampir 2 s.d 3 % dari kebutuhan energi listrik dunia dengan kisaran 80 s.d 90 % dari porsi tersebut digunakan oleh motor listrik sebagai pengerak pompa [8]. Seiring meningkatnya biaya energi, pabrik pemrosesan meningkatkan fokus mereka pada jumlah energi yang dikonsumsi oleh rotating equipment. Selain itu
IOP Conference Series: Earth and Environmental Science, 2020
This article proposes a design model for vertical axis wind turbines based on drag forces by addi... more This article proposes a design model for vertical axis wind turbines based on drag forces by adding fix drag-reducing to the blades tested by subsonic wind tunnel with wind speeds of 3-6 m/s and opening angle variations of fix drag-reducing from 0, 15, 30 and 45 ο. The research explained that at the opening angle of 15 ο can improve the performance of the wind turbine model significantly at high wind speeds on the contrary for larger angle openings. The addition of fix drag-reducing instead reduces the performance of the wind turbine model considerably on all variations of wind speed tested. 1. Introduction Economic growth and high world population require energy sources, where according to the prediction of the international energy agency [1] in 2030, energy demand increased by 45%, and fossil energy use still dominates up to 80% of the world's energy needs. The use of fossil energy has a severe impact both from the source side where fossil energy is classified as unrenewable energy, as well as the effects of its use on humans related to the environment, where the use of fossil energy causes an increase in carbon emissions which is the main cause of the atmosphere's greenhouse effect which ultimately causes changes climate [2]. Renewable energy is a subject that is highly regarded throughout the world. Wind energy is one of the most promising renewable energy sources, many countries have explored and used wind energy because of pollution-free and the availability of abundant sources of wind energy for conversion where Indonesia according to PEU has wind energy potential of 9 GW with an average wind speed of 3 m/s up to 6.3 m/s [3]. There are two types of vertical axis wind turbines, namely the first type of drug commonly known as Savonius wind turbine, where these turbines work with different drag forces created on the side of the returning blade and advancing blades and the second is the type of lift commonly known as the Darrieus wind turbine, where this turbine works due to the lift force created in the blade [4]. Wind in Indonesia has variable characteristics because Indonesia's geographical position on the equator and its average wind speed are low [5] so that the development of a suitable type of wind turbine is the Savonius vertical axis wind turbine. The performance of Savonius wind turbines is influenced by many things, one of which is the shape of the blade geometry and flow parameters [6]. The influence of the number of blades on the savonius wind turbine has been examined [7-9], the results of their research explain that the number of blades on the savonius wind turbine has an impact on the performance of the turbine and the number of blades two which is the best amount of turbine performance.
Utilization of wind energy potential in Indonesia is still small due to the range of wind charact... more Utilization of wind energy potential in Indonesia is still small due to the range of wind characteristics in Indonesia frequently changing direction change and its average speed is also categorized low. For that we need to develop high-efficiency wind turbines at low wind speeds. In this research, a Savonius turbine model was developed as the main blade with 2 obstacle blades, the model was tested in a subsonic wind tunnel at wind speeds of 3-6 m / s with variations in the gap of the main and obstacle blades are 2, 4 and 6 cm. The results explained that at a gap of 6 cm, the presence of an obstacle blade can improve the performance of Savonius wind turbine models by 77.74% at a tip speed ratio of 0.88. In addition, the presence of obstacles can increase the ability of wind turbines to do self-starting.
Utilization of wind energy potential in Indonesia is still small due to the range of wind charact... more Utilization of wind energy potential in Indonesia is still small due to the range of wind characteristics in Indonesia frequently changing direction change and its average speed is also categorized low. For that we need to develop high-efficiency wind turbines at low wind speeds. In this research, a Savonius turbine model was developed as the main blade with 2 obstacle blades, the model was tested in a subsonic wind tunnel at wind speeds of 3-6 m / s with variations in the gap of the main and obstacle blades are 2, 4 and 6 cm. The results explained that at a gap of 6 cm, the presence of an obstacle blade can improve the performance of Savonius wind turbine models by 77.74% at a tip speed ratio of 0.88. In addition, the presence of obstacles can increase the ability of wind turbines to do self-starting.
Semakin meningkatnya tingkat kesejahteraan bangsa Indonesia, begitupula jumlah penduduknya menyeb... more Semakin meningkatnya tingkat kesejahteraan bangsa Indonesia, begitupula jumlah penduduknya menyebabkan semakin meningkat pula kebutuhan energi masyarakat Indonesia. BBM adalah jenis energi fosil yang dominan digunakan oleh masyarakat sehingga sebagai sumber energy utama, namun sifatnya tidak terbarukan dan dalam penggunaannya tidak ramah terhadap lingkungan. Pemenuhan kebutuhan energi kita mengimpor BBM dari luar selain itu kebijakan pemerintah yang memberikan subsidi BBM berdampak terhadap cadangn devisa bangsa Indonesia. Oleh karena itu diperlukan pengembangan dalam pemanfaatan energi alternatip selain BBM. Indonesia yang memiliki panjang pantai 80.000 km dan posisinya di garis katulistiwa memiliki potensi energi angin yang cukup besar yang karekteristik angin yang berubah-ubah, oleh karena itu penulis mengembangkan prototype turbin angin sumbu vertikal dua tingkat dengan bilah Modified NACA 0018 yang sesuai dengan karekteristik angin di Indonesia skala rumah tangga untuk membangkit listrik. Hasil pengujian memaparkan pada sudut pitch 60 0 karekteritik turbin yang dikembagnkan menurun dan hasil produksi listrik rata-rata per hari sebesar 672 Wh.
— This article proposes a model design of vertical axis wind turbine with blades hybrid is a comb... more — This article proposes a model design of vertical axis wind turbine with blades hybrid is a combination of NACA 0018 airfoil profile blades and curve C with and without a guide vane tested with subsonic wind tunnel for four Reynolds number. Results of the study describes the addition of guide vane in the wind turbine model is able to improve the performance of wind turbine models significantly. The increase in performance compared to using the guide vane wind turbine model without a guide vane on the maximum condition reached 150%, besides the addition of guide vane is able to improve self-starting wind turbine model.
The length of 80791.42 km coastline Indonesia is a potential area for the development of wi... more The length of 80791.42 km coastline Indonesia is a potential area for the development of wind energy with wind speeds average is generally between 3 m/s to 5 m/s, the total wind energy potential is estimated to reach 9 GW. However, the geographical Indonesia as a tropical country has characteristics of wind direction in Indonesia frequent changes, which condition is causing the sustainability of energy production from horizontal axis wind turbine rotor turbine disrupted due must always deal with the arrival of the wind direction. It required the design of the turbine according to the characteristics and the wind speed in Indonesia. In the present study to see the effect of adding wind deflector on the performance of vertical axis wind turbine models Darrieus type-H blades with NACA 0018 profile of the tested wind speed 2.86 m / s and 3.43 m / s and a pitch angle of 15 deg, 20 deg , 25 deg and 30 deg with a load of 200, 250 and 300 gr. The results presented that the addition of wind deflector can improve the performance of vertical axis wind turbines Darrius type-H in the form of 56.37% power turbine and turbine performance coefficient of 65.03% on the pitch angle 30 deg at wind speed 3.43 m / s
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Papers by Indra I H S Siregar
subsidize the fuel to meet the domestic market meet. For the environment, emission of degragates the quality of air. This research aims to overviews the influences of addition of hydroxy gas yielding by vortex type generator
which later be injected to intake manifold to improve gasoline engine performance. Variation of ignition time is setup to be 100, 150 and 200 BTDC for the treatment. The result are to be compared to ignition time of pure gasoline as of 150 BTDC . Measured parameters are obtained by using Wide Open Throttle method.The impact of hydroxy gas injected to intake manifold at ignition time 200 BTDC gives and improvement power as much as 2-5% and efficiency at rate 5-15%
air. This research aims to overviews the influences of addition of hydroxy gas yielding by vortex type generator which later be injected to intake manifold to improve gasoline engine performance. Variation of ignition time is setup to be 100,, 150 and 200 BTDC for the treatment. The result are to be compared to ignition time of pure gasoline as of 150 BTDC . Measured parameters are obtained by using Wide Open Throttle method.The impact of hydroxy gas injected to intake manifold at ignition time 200 BTDC gives and improvement power as much as 2-5% and efficiency at rate 5-15%.
has characteristics of wind direction in Indonesia frequent changes, which condition is causing the sustainability of energy production from horizontal axis wind turbine rotor turbine disrupted due must always deal with the arrival of the wind direction. It required the design of the turbine
according to the characteristics and the wind speed in Indonesia. In the present study to see the effect of adding wind deflector on the performance of vertical axis wind turbine models Darrieus type-H blades with NACA 0018 profile of the tested wind speed 2.86 m / s and 3.43 m / s and a pitch angle of 15 deg, 20 deg , 25 deg and 30 deg
with a load of 200, 250 and 300 gr. The results presented that
the addition of wind deflector can improve the performance of vertical axis wind turbines Darrius
type-H in the form of 56.37% power turbine and turbine performance coefficient of 65.03% on the
pitch angle 30 deg at wind speed 3.43 m / s
subsidize the fuel to meet the domestic market meet. For the environment, emission of degragates the quality of air. This research aims to overviews the influences of addition of hydroxy gas yielding by vortex type generator
which later be injected to intake manifold to improve gasoline engine performance. Variation of ignition time is setup to be 100, 150 and 200 BTDC for the treatment. The result are to be compared to ignition time of pure gasoline as of 150 BTDC . Measured parameters are obtained by using Wide Open Throttle method.The impact of hydroxy gas injected to intake manifold at ignition time 200 BTDC gives and improvement power as much as 2-5% and efficiency at rate 5-15%
air. This research aims to overviews the influences of addition of hydroxy gas yielding by vortex type generator which later be injected to intake manifold to improve gasoline engine performance. Variation of ignition time is setup to be 100,, 150 and 200 BTDC for the treatment. The result are to be compared to ignition time of pure gasoline as of 150 BTDC . Measured parameters are obtained by using Wide Open Throttle method.The impact of hydroxy gas injected to intake manifold at ignition time 200 BTDC gives and improvement power as much as 2-5% and efficiency at rate 5-15%.
has characteristics of wind direction in Indonesia frequent changes, which condition is causing the sustainability of energy production from horizontal axis wind turbine rotor turbine disrupted due must always deal with the arrival of the wind direction. It required the design of the turbine
according to the characteristics and the wind speed in Indonesia. In the present study to see the effect of adding wind deflector on the performance of vertical axis wind turbine models Darrieus type-H blades with NACA 0018 profile of the tested wind speed 2.86 m / s and 3.43 m / s and a pitch angle of 15 deg, 20 deg , 25 deg and 30 deg
with a load of 200, 250 and 300 gr. The results presented that
the addition of wind deflector can improve the performance of vertical axis wind turbines Darrius
type-H in the form of 56.37% power turbine and turbine performance coefficient of 65.03% on the
pitch angle 30 deg at wind speed 3.43 m / s