Analisis Performansi Turbin Angin Poros Horisontal Model Double Rotor Contra Rotating Dengan Posisi Rotor Saling Berhimpitan

The contra rotating wind turbine is a horizontal axis turbine which has two shaft rotating in opposite directions on the same axis, and it can work at low wind speeds. In general, the performance of the wind turbine are affected by several factors, which is the aerodynamics shape of turbine, the numbers of blade and the selection angle of blade. In this study, conducted by determining the variation of angle on the blade and the blade angle used in the study is 0o, 5o, and 10o, on the two rotors with diameter of front rotor is 0.50 meters and the rear rotor is 0.30 meters, with the position of the rotor blade is coincident with each other. The purpose of this study, is to determine the effect of blade angle variation on the turbine rotation (rpm), torque (T), the power coefficient (Cp), torque coefficient (Cq) and the efficient of the turbine at any wind speeds variations. On the graph relation of blade angle on the shaft rotation, turbine rotation riding known to along with the addition of angle of the blade. The speed of wind is very affect on the output or mechanical power and power coefficient. On the blade angle 0o with wind speed at 4.03 m/s, the power can be generate is 3.013 Watt, and for blade angle 10o with wind speeds 6.08 m/s, the power can be generate is 8.217 Watt. The lowest rotation of rotor without loading is 702 rpm at the wind speeds on 4.03 m/s with angle of blade 0o, the highest rotation of rotor is 1484 rpm on the wind speeds 6.08 m/s with angle of blade 10o. From the graph of analysis data can be seen , with change of angle blade on wind turbine horizontal shaft contra rotating models, power coefficient (Cp) generated of turbine activity increases with increased of angle, with Cp maks 0.718 for angle 10o, maximum efficiency an generated reach out 71.8

Pengaruh Rasio Diameter sebagai Parameter Kinerja Aerodinamika Dual Rotor Counter-rotating Wind Turbine

Penggunaan energi alternatif yang ramah lingkungan (Green Energy) merupakan topik utama yang mulai banyak dibahas dewasa ini. Salah satu sumber energi terbarukan yaitu energi angin (turbin angin). Seiring dengan perkembangan teknologi, maka dikembangkan Counter Rotating Wind Turbine (CRWT). CRWT merupakan turbin angin dengan poros horisontal terdiri dari dua buah rotor yang putaran rotor saling berlawanan arah. Efisiensi konversi energi turbin angin dual rotor ini secara teoritis lebih baik dari pada rotor tunggal. Pada penelitian ini difokuskan pada CRWT dengan tipe propeler tiga blade menggunakan airfoil S826. Tujuan penelitian adalah untuk menganalisis melalui desain dan analisis rotor turbin (kajian rotor turbin) yang terdapat pada CRWT terutama pengaruh rasio diameter (D) antara rotor depan (D1) dan rotor belakang terhadap performa dari CRWT, dengan permodelan menggunakan program GAMBIT dan solver simulasi menggunakan program FLUENT CFD ANSYS.Hasil dari penelitian ini menunjukkan bahwa variasi yang dilakukan pada rasio diameter rotor memberikan pengaruh terhadap performance aerodinamika dari CRWT. Penggunaan rasio diameter D1/D2 = 1 menghasilkan torsi yang terbaik, sehingga daya dan efisiensi turbin juga semakin baik atau meningkat

Studi eksperimen rumah pengering ultra-violet (solar dryer) sistem hibrid tungku biomassa melalui variasi kecepatan aliran udara panas

The ultra-violet dryer integrated with the biomass furnace is a drying method with a forced mechanism. In this study, an experimental study was carried out. The drying process of porang tubers uses a hybrid system ultra violet plastic dryer (UV solar dryer) through varying the speed of the inlet air to obtain efficient drying results and porang tuber products. The results showed that the final moisture content of porang tubers after drying per day for each variation of air speed obtained the lowest value of 10.50%bb with the highest drying rate of 0.3373 kg/hour from the assumption of an initial moisture content of 70%bb, which occurs in variations airspeed of 1.8 m/s. while the speed is 1.3 m/s with the lowest drying rate of 0.330 kg/hour with a final moisture content of 11.74%.bb) Drying efficiency for variations in the speed of hot air flow into the hot air duct of the biomass furnace shows the highest value at a speed of 1.3 m/s of 16.76% with the lowest specific energy consumption (KES) of 51975.7 kJ/kg

The response of the Antarctic Circumpolar Current to recent climate change

Observations show a significant intensification of the Southern Hemisphere westerlies, the prevailing winds between the latitudes of 30° and 60° S, over the past decades. A continuation of this intensification trend is projected by climate scenarios for the twenty-first century. The response of the Antarctic Circumpolar Current and the carbon sink in the Southern Ocean to changes in wind stress and surface buoyancy fluxes is under debate. Here we analyse the Argo network of profiling floats and historical oceanographic data to detect coherent hemispheric-scale warming and freshening trends that extend to depths of more than 1,000 m. The warming and freshening is partly related to changes in the properties of the water masses that make up the Antarctic Circumpolar Current, which are consistent with the anthropogenic changes in heat and freshwater fluxes suggested by climate models. However, we detect no increase in the tilt of the surfaces of equal density across the Antarctic Circumpolar Current, in contrast to coarse-resolution model studies. Our results imply that the transport in the Antarctic Circumpolar Current and meridional overturning in the Southern Ocean are insensitive to decadal changes in wind stress

PEMBERDAYAAN EKONOMI MASYARAKAT BERBASIS TEKNOLOGI IRIGASI TETES DENGAN ENERGI HIJAU PADA KELOMPOK TANI

Abstrak: Program Pemberdayaan Masyarakat oleh Mahasiswa (PMM) bekerja sama dengan mitra kelompok tani Bethesda yang dilaksanakan di lokasi mitra di Desa Penfui Timur, Kecamatan Kupang Tengah, propinsi Nusa Tenggara Timur untuk mendorong peningkatan usaha budidaya produksi tanaman hortikultura. Kegiatan ini bertujuan untuk melakukan penerapan teknologi Sistem Irigasi Tetes (SIT) dengan energi hijau sebagai sumber energi sistem berupa aplikasi energi surya. Pendampingan kepada anggota kelompok tani Bethesda (15 orang) dan aplikasi penggunaan teknologi tersebut untuk mengatasi persoalan mitra yakni menurunnya tingkat produksi hingga kegagalan panen oleh petani akibat kekeringan. Metode pelaksanaan kegiatan adalah melalui focus group discussion (FGD) dan praktik langsung dilapangan tentang teknologi tersebut. Evaluasi melalui kuisioner yang diberikan kepada responden (mitra) sebelum dan sesudah kegiatan untuk melihat presentasi peningkatan kemampuan petani. Hasil kegiatan ini adalah selain produk teknologi pada lokasi mitra, terjadi peningkatan level dan kapasitas petani hingga 85,93 % dengan harapan adanya keberlanjutan teknologi pertanian untuk membantu petani dalam usaha budidaya tanaman hortikultura.Abstract: The Community Empowerment Program by Students (PMM) in collaboration with Bethesda farmer group partners is carried out at partner locations in East Penfui Village, Central Kupang District, East Nusa Tenggara province to encourage increased cultivation of horticultural crop production. This activity aims to implement Drip Irrigation System (SIT) technology with green energy as a system energy source in the form of solar energy applications. Assistance to members of the Bethesda farmer group (15 people) and application of the use of this technology to overcome partners' problems, namely decreasing production levels and crop failure by farmers due to drought. The method of implementing activities is through focus group discussions (FGD) and direct practice in the field regarding this technology. Evaluation through questionnaires given to respondents (partners) before and after the activity to see the presentation of increasing farmers' abilities. The result of this activity is that apart from technology products at partner locations, there has been an increase in the level and capacity of farmers by up to 85.93% with the hope of sustainable agricultural technology to help farmers in cultivating horticultural crops

Penerapan Teknologi Pembuatan Kompos Bagi Kelombok Petani Kopi Arabika di Kelurahan Kisanata

Program Pemberdayaan Masyarakat kelurahan Kisanata, kecamatan Bajawa dalam memanfaatkan limbah pertanian seperti daun-daun, ranting-ranting kayu, dan rumput dengan komposisi 30% hijauan dan 60 % bahan coklat serta 10 % komponen lain untuk pembuatan pupuk kompos. Sasaran utama program ini adalah masyarakat kelurahan Kisanata dan sekitarnya khususnya petani kopi Arabika Flores Bajawa. Pada kegiatan ini diharapkan masyarakat tersebut dapat memahami dan terampil membuat pupuk dari hijauan dan bokashi yang bernilai ekonomis dari bahan limbah pertanian. Hal ini tentu sangat membantu masyarakat petani dalam meningkatkan produktifitas pertanian sekaligus kesejahteraan mereka. Tujuan dari kegiatan ini yaitu untuk meningkatkan peran masyarakat dalam melestarikan lingkungan hidup sebagai jasa ekologi dan bernilai ekonomi. Metode yang diterapkan dalam kegiatan ini yaitu mencakup pada perspektif action research dengan manfaat yang ingin dicapai yakni perbaikan dan peningkatan pemahaman terhadap proses pembuatan pupuk kompos. Hasil kegiatan yaitu meningkatkan pengetahuan dan keterampilan petani dalam proses pupuk organik dari limbah pertanian yang banyak terdapat di lingkungan sekitarnya

Pelatihan Perawatan Pompa Hidram untuk Kelompok Tani Utama Di Daerah Baumata

Dry land agriculture is a crop cultivation activity carried out in moderate to severe drought conditions during most of the growing season. As a result, special cultivation techniques, types of crops and farming systems are needed to enable sustainable production. The partner involved in the Program Kemitraan Masyarakat (PKM) is a farmer group called the main farmer group. The main farmer group is located in Baumata village, Taebenu sub-district, Kupang district. This farmer group has used appropriate technology in the form of a hydram pump. The Hydram Pump, which is located in Baumata village is a product of the LP2M through the Mechanical Engineering Study Program, Faculty of Science and Engineering in 2018and is still running and is still being used by farmer groups. Based on the survey and coordination of the implementation team to the location until December 2019, it was concluded that there was a need for field activities in the context of training activities for members of farmer groups on how to repair, maintain and deal with pump problems which decrease productivity and aspects of pump work functions accordingly with a description of the report of the members of the Farmer Group