Articles you may be interested in MHD peristaltic transport of spherical and cylindrical magneto-nanoparticles suspended in water AIP Advances 5, 077104 (2015); 10.1063/1.4926368Fe3O4 nanoparticles and nanocomposites with potential application in biomedicine and in communication technologies: Nanoparticle aggregation, interaction, and effective magnetic anisotropy
Telah dilakukan penelitian tentang generator termoelektrik untuk pengisian aki, dengan tujuan untuk mengetahui dampak perbedaan penggunaan sield (kerangka sistem pemanas) antara triplek dan alumunium pada sistem pemanas TEG. Disamping itu juga untuk mengetahui berapa lama waktu yang dibutuhkan untuk pengisian aki sebagai pengaplikasian TEG. Penelitian ini difokuskan pada pembuatan sistem pemanas yang lebih efisien, yang dilakukan dengan meningkatkan efisiensi dari modul TEG dalam menghasilkan tegangan. Hasil penelitian ini menunjukkan pembaruan sistem pemanas dengan menggunakan sield alumunium dapat meningkatkan tegangan keluaran generator termoelektrik sebesar 4,435% dibandingkan dengan hasil penelitian sebelumnya dengan menggunakan TEG tipe SP184827145SA. Sedangkan pada pengaplikasian pengisian aki menggunakan TGPR-1W-2V-21S dapat menghasilkan tegangan sebesar 6 ± 0,05 Volt dengan besar arus 0,43 ± 0,015 Ampere yang memerlukan lama waktu pengisian 10 jam.
IntisariTelah dilakukan pembuatan alat ukur ketinggian permukaan air sungai menggunakan prinsip tekanan berbasis mikrokontroler Atmega328. Besaran ketinggian permukaan air sebanding dengan tekanan di dalam air tersebut diubah menjadi besaran tekanan dengan menggunakan pipa transmiter yang didalamnya terdapat sensor tekanan BMP085. Data diolah dengan menggunakan mikrokontroler ATMega382, yang kemudian ditampilkan pada liquid crystal display (LCD) 16 × 2. Berdasarkan penelitian yang telah dilakukan, pipa transmitter tersebut dapat digunakan mengukur ketinggian permukaan air dengan menggunakan prinsip tekanan. Sensor tekanan BMP085 dan pipa transmitter yang dirancang mampu digunakan dengan baik dengan berdasarkan pada faktor kalibrasi: Level = (11,52 × Tekanan -11612) mm. Ketika pengujian sistem, ketinggian permukaan air pasang di pintu air kali Wonorejo, Surabaya dapat diamati dengan faktor koreksi: Level = (11,47 × Tekanan -10149) mm. AbstractMeasuring tools water level of theriver using ATmega328 microcontroller-based pressure principle has been made. The amount of water level proportional to the pressure in the water is converted into pressure transmitter using a pipe in which there is a pressure sensor BMP085. Data were processed using ATMega382 microcontroller, which is then displayed on a liquid crystal display (LCD) 16 × 2. Based on the research that has been done, the transmitter pipe can be used to measure the height of the water surface by using the principle of pressure. BMP085 pressure sensor and transmitter that is designed pipe is able to be used properly with based on the calibration factors: Level = (11.52 × pressure -11612) mm.. When testing the system, the water level in the tidal riversluice Wonorejo, Surabaya can be observed by a correction factor: Level = (11.47 × pressure -10149) mm.KATA KUNCI: pressure principle, level measurement, high water level I. PENDAHULUANAir merupakan elemen utama yang ada di bumi. Sebagian besar (71%) dari permukaan bumi tertutup oleh air. Sekalipun jumlah air relatif konstan, tetapi air tidak diam melainkan bersirkulasi setiap saat. Air berperan penting dalam ekosistem lingkungan dan kehidupan manusia, air digunakan dalam kehidupan sehari-hari untuk keperluan rumah tangga sampai dengan industri. Air tersebut dapat berasal dari air laut, air tanah, air danau atau air sungai. Jumlah ketersedian air yang dibutuhkan oleh indutri maupun masyarakat umum harus tetap terjaga ketersediaanya dan sehingga dapat tercukupi dengan baik. Karena ketersediaan air dapat mempengaruhi proses produksi (pada industri) dan proses kehidupan sehari-hari. Untuk mengetahui jumlah ketersediaan air tersebut, diperlukannya suatu alat yang dapat mengukur level (ketinggian permukaan) air. Perancangan dan pengukuran level * E-MAIL: bachtera@physics.its.ac.id air dilakukan agar mudah dalam melakukan pengukuran dan pengamatan ketinggian air secara langsung setiap saat [1].Setiap alat ukur instrument yang dipergunakan untuk mengukur dan menunjukkan tinggi dari permukaan cairan disebut sebagai alat uk...
Electrical energy has become a basic need of modern society, but the supply of electricity has not yet fully met the needs of the community. Many potential energy sources can be converted into electrical energy. One potential of energy sources is water flow which can be used for micro-hydro power plants in remote areas. This study aims to analyze the characteristics of the Archimedes screw turbine of micro-hydro power plant, in particular concerning on variations in the elevation angle of the turbine. Characteristics determination was carried out on a prototype of a micro-hydro power plant using a Brush Less Direct Current (BLDC) generator and two blades of Archimedes screw turbine. The varied turbine elevation-angle was applied, namely 20, 25, 30, 35, and 40 o , with a water discharge of 2.64 L/s. The results show that an increase in the turbine elevation angle from 20 to 40 o causes an enhancement in mechanical characteristics, i.e. torque and rpm, as well as electrical characteristics, i.e. voltage, current, and electric power. The mechanical and electrical characteristics reach a maximum value at the elevation angle of about 30 o , which is 27.87 mW at 1 kΩ load. Furthermore, increasing the elevation angle to become more than 30 o causes a decrease in mechanical and electrical characteristics.
Electrical energy has a very important role in human life, but the electricity supply still does not fully meet the needs of the community. Many potential energy resources can be converted into electrical energy. One of the potential energy resources is the flow of water that can be used for micro-hydropower plants for remote areas. This paper presents the results of research on micro-hydro power plants using Archimedes screw turbines. This power generation system has several advantages, namely low maintenance costs, does not damage the water ecosystem, does not require extensive land. The purpose of this research is to study the characteristics of the Archimedes micro-hydro power plant on variations in water discharge. These characteristics include mechanical characteristics such as the maximum torque and rpm and electrical characteristics such as voltage, current and electric power. The determination of characteristics is carried out on the prototype of the micro hydropower plant Archimedes screw turbine with the specifications of the turbine screw having 2 blades, the turbine elevation angle of 30°, 2.5: 1 gearbox ratio using four variations of water discharge, namely 1.18 l/s, 2.33 l/s, 2.55 l/s, and 2.64 l/s. The determination results of the micro hydropower plant Archimedes screw turbine characteristics show that an increase in water flow will cause an increase in mechanical characteristics such as large torque and rpm and electrical characteristics such as voltage, current and electric power. However, the increase in the magnitude of these characteristics is not directly proportional to the increase in water discharge.
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