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<![CDATA[ANALISIS GARIS ALIRAN (STREAMLINE) PADA TURBIN ANGIN SUMBU HORIZONTAL TIPE PROPELER TIGA BLADE ROTOR GANDA DENGAN METODE CFD (COMPULATIONAL FLUID DYNAMICS) ]]>
<![CDATA[Hangge, Fernanda Yusuf]]>;
<![CDATA[Koehuan, Verdy A.]]>;
<![CDATA[Bunganaen, Wenseslaus]]>
<![CDATA[ LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 01 (2023): April 2023 ]]>
Publisher : <![CDATA[Universitas Nusa Cendana ]]>
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DOI: 10.35508/ljtmu.v10i01.11502
<![CDATA[Tujuan penelitian ini adalah untuk mengetahui pola garis aliran fluida melewati rotor turbin angin sumbu horisontal atau horizontal axis wind turbine (HAWT) tipe propeler tiga blade rotor ganda kontra rotasi (double rotor counter-rotation) melalui metode computational fluid dynamics (CFD). Hasil simulasi CFD rotor turbin CRWT dengan penurunan skala geometri menunjukkan turbin cenderung beroperasi pada TSR rendah. Rotor depan turbin CRWT cenderung beroperasi dengan koefisien daya dan TSR yang lebih tinggi dari rotor belakang. Garis aliran (streamline) pada bidang horizontal arah aksial CRWT mengkonfirmasi pengaruhnya terutama aliran di sekitar permukaan blade terhadap performa CRWT. Garis aliran pada permukaan blade rotor depan dan rotor belakang pada turbin CRWT terhadap penurunan skala geometeri (FC = 0,25 dan 0,26 serta 0,3), dimana turbin beroperasi di TSR rendah sangat berbeda dari CRWT pada skala penuh (FC=1,0). Karena CRWT dengan penurunan factor skala geometri rotor yang membuat turbin beroperasi pada TSR rendah ini menyebabkan terjadinya separasi dan vortex di sekitar permukaan blade yang sangat kuat sehingga terjadi peningkatan gaya hambat dan penurunan gaya angkat. Peningkatan gaya hambat pada blade dapat menyebabkan penurunan torsi yang dibangkitkan oleh rotor turbin yang akibatnya menurunkan daya turbin.]]>
<![CDATA[Simulasi CFD (Compulational Fluid Dynamics) Turbin Angin Sumbu Horizontal Tipe Propeler Tiga Blade Rotor Ganda Melalui Variasi Geometri ]]>
<![CDATA[Koehuan, Verdy A.]]>;
<![CDATA[Hale, Roybertho Agustinus]]>;
<![CDATA[Mangesa, Daud P.]]>
<![CDATA[ LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 02 (2023): Oktober 2023 ]]>
Publisher : <![CDATA[Universitas Nusa Cendana ]]>
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DOI: 10.35508/ljtmu.v10i02.11503
<![CDATA[Tujuan penelitian ini adalah untuk mengetahui performa turbin angin sumbu horisontal atau horizontal axis wind turbine (HAWT) tipe propeler tiga blade rotor ganda kontra rotasi (double rotor counter-rotation) terhadap variasi geometri rotor CRWT menggunakan metode computational fluid dynamics (CFD). Hasil simulasi CFD rotor turbin CRWT dengan penurunan skala geometri menunjukkan turbin cenderung beroperasi pada TSR rendah. Rotor depan turbin CRWT cenderung beroperasi dengan koefisien daya dan TSR yang lebih tinggi dari rotor belakang. Vektor kecepatan aliran pada bidang vertikal arah aksial CRWT juga dikonfirmasi oleh hasil analisis kontur kecepatan aliran dan kontur turbulent kinetic energy terhadap penurunan performa CRWT karena adanya penurunan faktor skala geometri rotor turbin. Vektor kecepatan pada tip blade antara rotor depan dan rotor belakang pada turbin CRWT dengan penurunan skala geometeri (FC = 0,25 dan 0,26 serta 0,3) yang beroperasi di TSR rendah yang arahnya cenderung menguat menuju ke tip blade dengan besaran vektor yang makin kuat di sisi hisap (suction surface) blade rotor belakang. Besaran vektor ini semakin kuat ini dapat membentuk vorteks yang menurunkan performa CRWT.]]>
<![CDATA[Eksperimen Rumah Pengering Ikan Sarden Model Ultra Violet (UV) Solar Dryer Kombinasi dengan Sistem Solar Air Heater Melalui Variasi Kecepatan Udara Keluar ]]>
<![CDATA[Punuf, Rolandi]]>;
<![CDATA[Riwu, Defmit B.N.]]>;
<![CDATA[Koehuan, Verdy A.]]>
<![CDATA[ LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 01 (2023): April 2023 ]]>
Publisher : <![CDATA[Universitas Nusa Cendana ]]>
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DOI: 10.35508/ljtmu.v10i01.11986
<![CDATA[The technique for preserving a new product is by using a drying technique. The development and utilization of solar energy must continue to be developed with several technologies including the Solar Air Heater. The research method used was an experimental method on Ultra-Violet solar dryer drying houses for drying sardines with additional absorption of solar radiation heat using a solar air heater system. This configuration works by drawing air from the building envelope or from the outside environment and passing it through a collector where the air is warmed by conduction and convection in the absorber. The analysis of this study is regarding the velocity of the airflow coming out of the drying chamber, namely 1.0 m/s, 1.5 m/s and 1.8 m/s, while the airflow velocity in the solar panel (exhaust fan) is 3.5 m/s (constant). The results of the study show that the addition of heat through the solar air heater panel can speed up the drying process in the drying chamber. The temperature difference in the solar panel increases the heat absorbed through the hot air flow which also increases the efficiency of the solar panel. The highest efficiency of the drying house is 48.05 % occurring at the outlet air flow rate of 1.8 m/s. The temperature difference in the drying chamber and the increased ambient air tends to increase the efficiency of the drying chamber where in this study the highest value of 48.05% was obtained at a speed of 1.8 m/s]]>
<![CDATA[Pengujian Skala Laboratorium Performa Rotor Turbin Angin Ganda Kontra-Rotasi Melalui Variasi Rasio Geometri ]]>
<![CDATA[PAE, KOSTAN]]>;
<![CDATA[Koehuan, Verdy A.]]>;
<![CDATA[Gurnawati, Gurnawati]]>
<![CDATA[ LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 01 (2024): April 2024 ]]>
Publisher : <![CDATA[Universitas Nusa Cendana ]]>
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DOI: 10.35508/ljtmu.v11i01.14082
<![CDATA[The aim of this research is to determine the performance of a double rotor counter-rotation wind turbine on the geometric configuration of the CRWT rotor ratio. Tests were carried out on a laboratory scale with a turbine rotor blade model using the S826 airfoil series issued by NREL (National Renewable Energy Laboratory), where the rotor diameter at field scale (full scale) was 0.944 m. The blade is made through a 3D printing process using PLA (polylactic acid) material with an S826 airfoil profile. Laboratory scale testing uses a wind tunnel with test section dimensions of 0.6 m long, 0.3 m wide and 0.3 m high and the wind speed is considered uniform, varying from 3 m/s to 5 m/s. The performance of CRWT with rotor geometry ratio D1/D2 < 1 is better than CRWT with rotor geometry ratio D1/D2 > 1 at rotor distance Z/D1= 0.4. Varying the turbine geometry ratio with a smaller front rotor diameter, the power coefficient of the front rotor turbine is higher than the turbine with a larger front rotor diameter.]]>
<![CDATA[Analisis Kualitas Briket Berbahan Dasar Cangkang Kemiri ]]>
<![CDATA[fallo, Gideon]]>;
<![CDATA[Riwu, Defmit B.N.]]>;
<![CDATA[Koehuan, Verdy A.]]>
<![CDATA[ LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 01 (2024): April 2024 ]]>
Publisher : <![CDATA[Universitas Nusa Cendana ]]>
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DOI: 10.35508/ljtmu.v11i01.14285
<![CDATA[The increasing use of fossil fuels, which is aware of the issue of global warming and environmental damage due to pollution, has increased efforts to develop renewable energy sources. Briquettes are one of the alternative sources of renewable energy that have been developed this decade. This research is part of an effort to develop briquettes, especially hazelnut shell briquettes, as an alternative fuel. Making hazelnut shell charcoal briquettes is carried out by carbonization process using the pyrolysis method. Making starch adhesive (tapioca starch) with a ratio of charcoal powder and starch adhesive (tapioca flour) of 90:10%. Furthermore, the candlenut shell briquettes were tested for proximation tests (ash content, moisture content and calorific value). Candlenut shell briquettes can be used as an alternative fuel because they have a high calorific value of 6061kcal/kg. The hazelnut shell briquettes basically comply with the Indonesian National Standard SNI 01-6235-2000 and the Emission Standards of the Regulation of the State Minister for the Environment Number 05 of 2006 regarding the threshold for exhaust emissions of old motorized vehicles.]]>
<![CDATA[Pembuatan dan Pengujian Alat Penetas Telur Bertenaga Surya Tegangan 12V DC ]]>
<![CDATA[Nuban, Jondri K. A.]]>;
<![CDATA[Koehuan, Verdy A.]]>;
<![CDATA[Selan, Rima N.]]>;
<![CDATA[Tobe, Adi Y.]]>
<![CDATA[ LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 01 (2024): April 2024 ]]>
Publisher : <![CDATA[Universitas Nusa Cendana ]]>
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DOI: 10.35508/ljtmu.v11i01.17756
<![CDATA[produce quality poultry chicks. However, the natural egg-hatching process is often less efficient and susceptible to fluctuations in environmental temperature. Therefore, to increase the efficiency and results of egg hatching, this research aims to design and test an automatic chicken egg incubator that uses solar energy. This tool is designed to consider factors such as temperature, humidity, and air circulation required for optimal egg hatching. Testing was carried out for 21 days, by monitoring environmental temperature, humidity, and temperature distribution in the egg hatching room. The test results showed that the tool was able to reach the desired temperature for hatching eggs and succeeded in hatching several eggs well, while some other eggs experienced defects or died during the hatching process. In addition, power and energy consumption analysis shows that the device has quite good efficiency in using energy, with low energy consumption to maintain the room temperature within the desired range. The solar-powered automatic egg incubator has the potential to increase the efficiency and yield of egg hatching in the livestock industry and can be an environmentally friendly alternative by utilizing solar energy which is available freely and sustainably]]>
<![CDATA[The Analisis Instalasi Sistem Plumbing Air Bersih pada Lantai III Gedung Rumah Sakit Umum Daerah Ruteng ]]>
<![CDATA[Panggar, Alfonsus Zenelius]]>;
<![CDATA[Koehuan, Verdy A.]]>;
<![CDATA[Pell, Yeremias M.]]>
<![CDATA[ LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 02 (2024): Oktober 2024 ]]>
Publisher : <![CDATA[Universitas Nusa Cendana ]]>
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DOI: 10.35508/ljtmu.v11i02.18045
<![CDATA[Research aims to analyze the clean water installation system in the Nursing Care Room on Floor III of the Ruteng Regional General Hospital building which is divided into three lines, namely the pump line to the upper reservoir, the reservoir line to distribution pipe A and the reservoir line to distribution pipe B. Installation system plumbing is an installation to meet the water needs of every plumbing equipment installed in a building. The analysis results show that the need for clean water in installation line A is 990 liters, while for installation line B it is 1,410 liters. So the total water requirement per day for the clean water plumbing system installation at Ruteng Regional Hospital is 2,400 liters per day. The pump power requirement is 170.45 Watts with a total head of 26.059 m and a flow rate of 2.41 m3/hour. If the analysis of pump needs is also to serve the clean water needs for the 1st and 2nd floors, assuming the water needs are the same as for the 3rd floor, each at 2.41 m3/hour with a total discharge of 7.23 m3/hour and a total pump head. 39.13 m, and the pump power requirement is 767.87 Watts.]]>
<![CDATA[Rancang Bangun Blade Turbin Angin Komposit Fiber Glass Menggunakan Cetakan Vacuum Bag ]]>
<![CDATA[Ndoya, Rikardo Aprisantus Singi]]>;
<![CDATA[Maliwemu, Erich U. K.]]>;
<![CDATA[Koehuan, Verdy A.]]>
<![CDATA[ LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 02 (2024): Oktober 2024 ]]>
Publisher : <![CDATA[Universitas Nusa Cendana ]]>
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DOI: 10.35508/ljtmu.v11i02.18128
<![CDATA[Penelitian ini bertujuan untuk merancang bangun bilah turbin angin komposit serat gelas menggunakan cetakan kantong vakum . Model sudu yang digunakan dalam penelitian ini yang selanjutnya disebut sebagai prototipe sudu adalah sudu turbin angin sumbu horizontal tipe baling-baling tiga sudu. Bilah rotor turbin ini menggunakan seri airfoil S826 dengan diameter rotor 0,944 m. Model blade digambar menggunakan Solidworks kemudian dilakukan proses cetak atau print 3D yang selanjutnya model blade ini dijadikan sebagai pola dalam pembuatan cetakan. Proses pembuatan blade melalui metode vaccum bag nilai fraksi volume tertinggi yaitu 38,51 % dengan kecepatan aliran resin 3,125 cm/menit dan laju aliran volume resin 4,276 ml/menit. Pengujian dilakukan ini untuk memperoleh tahapan pembuatan blade dengan metode vaccum yang tepat dalam memperoleh hasil cetakan yang baik, Proses vaccum bag memungkinkan untuk pengendalian yang lebih baik terhadap impregnasi resin ke dalam serat komposit, menghasilkan struktur yang homogen dan konsisten.]]>
<![CDATA[PENERAPAN SISTEM HIBRID SOLAR PV-DIESEL SEBAGAI LANGKAH AWAL UNTUK MENINGKATKAN RASIO ELEKTRIFIKASI PEDESAAN ]]>
<![CDATA[Dwinanto, Matheus M.]]>;
<![CDATA[Koehuan, Verdy A.]]>;
<![CDATA[Goetha, Selfiana]]>;
<![CDATA[Sundari, Woro]]>
<![CDATA[ Jurnal Abdi Insani Vol 11 No 4 (2024): Jurnal Abdi Insani ]]>
Publisher : <![CDATA[Universitas Mataram ]]>
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DOI: 10.29303/abdiinsani.v11i4.2045
<![CDATA[Niskolen Hamlet, Tuapanaf Village is one of the hamlets in Takari District, Kupang Regency, East Nusa Tenggara Province that does not yet have access to electricity from the PLN network. Its residents work as farmers and ranchers but have not been able to meet their electricity needs independently. This activity is an initial step to reveal the benefits of installing a hybrid power plant (solar PV - Diesel generator) on the rural electrification ratio. The method used in this activity is the application of a hybrid power plant (solar PV - Diesel generator) in several homes of residents categorized as underprivileged families. The results obtained from this community service activity are that the existence of a hybrid power plant has helped underprivileged families to obtain electricity so that it is hoped that it can encourage development and economic growth which can ultimately improve the welfare of residents. In addition, with the availability of electricity, it will increase opportunities for reading and learning, improve health, and have a good influence on family planning (because at night it can be filled with social activities, and make it easier and faster for residents to obtain information from electronic media) and can increase the confidence of residents so that it can open the way for the development of various innovations and village entrepreneurship.]]>
<![CDATA[SIMULASI COMPUTATIONAL FLUID DYNAMICS (CFD) RUMAH PENGERING UMBI PORANG SISTEM HYBIRD MELALUI VARIASI BEBAN ]]>
<![CDATA[bili, mario ardy]]>;
<![CDATA[Koehuan, Verdy A.]]>;
<![CDATA[Jasron, Jahirwan Ut]]>
<![CDATA[ LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 12 No 01 (2025): April 2025 ]]>
Publisher : <![CDATA[Universitas Nusa Cendana ]]>
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DOI: 10.35508/ljtmu.v12i01.8850
<![CDATA[Pengeringan produk pertanian khususnya adalah kadar krim dari produk sampai keseimbangan udara tercapai dengan lingkungan atau tingkat kelembaban di mana jamur, serangga dan perusak tidak dapat aktif lagi. Pengeringan merupakan salah satu proses pasca panen yang umum dilakukan pada berbagai produk pertanian yang bertujuan untuk menurunkan kadar air bahan sampai pada tingkat yang aman untuk disimpan atau digunakan pada proses lainnya. Proses pengeringan hasil pertanian yang banyak dilakukan oleh petani Indonesia adalah dengan pengeringan. Dengan mensimulasikan distribusi dan pola aliran udara, akan dimungkinkan untuk menentukan desain bangunan beserta penempatan parameternya. Pemanfaatan energi matahari menggunakan plastik ultraviolet.Mengetahui kinerja pengeringan dan distribusi suhu di ruang pengujian melalui pengujian menggunakan umbi porang dan tanpa umbi porang dari hasil simulasi perangkat lunak Gambit 2.4.6 dan Ansys 17.0 : Student Version. Simulasi pola aliran udara panas yang terjadi pada rumah pengering menggunakan model simulasi CFD melalui variasi beban. pada Pengeringan perlu diketahui dengan mensimulasikan Computational Fluid Dynamics (CFD). Salah satu keuntungan dari analisis CFD, antara lain, memberikan pemahaman yang rinci tentang distribusi aliran panas dan massa, dan mendukung untuk mengubah geometri.]]>
