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All Journal Rotasi Jurnal Teknik ITS Jurnal Simetris Rekayasa Mesin JURNAL INTEGRASI PROSES VANOS Journal of Mechanical Engineering Education Jurnal Rekayasa Mesin Journal of Science and Applicative Technology INVOTEK: Jurnal Inovasi Vokasional dan Teknologi Jurnal Tekno Insentif Jurnal Teknologi Terapan Journal of Renewable Energy and Mechanics International Journal of Applied Sciences and Smart Technologies Quantum Teknika Jurnal Vokasi Mekanika Sinergi Polmed : Jurnal Ilmiah Teknik Mesin AMMA : Jurnal Pengabdian Masyarakat Perwira Journal of Community Development (PJCD) Majalah Teknik Mesin

Devia Gahana Cindi Alfian

Department Of Mechanical Engineering, Institut Teknologi Sumatera, Jalan Terusan Ryacudu, Desa Way Hui, Kecamatan Jatiagung, Lampung Selatan, Indonesia 35365

Author-ID : 224346

Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Nursing Social Sciences Transportation Other

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Re-design High Pressure Heater (HPH) 5 pada Perusahaan Pembangkit Tenaga Listrik Devia Gahana Cindi Alfian; Djatmiko Ichsani
Jurnal Teknik ITS Vol 2, No 2 (2013)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Boiler merupakan komponen utama yang ada pada pembangkit. Jika terjadi penurunan efisiensi pada boiler, maka listrik yang dihasilkan juga menurun. Berbagai cara dilakukan untuk meningkatkan efisiensi dari boiler, salah satunya adalah menggunakan High Pressure Heater (HPH). HPH merupakan alat pemanas feedwater sebelum masuk ke boiler sehingga mengurangi kerja dari boiler. Saat ini kondisi HPH 5 yang ada di salah satu perusahaan pembangkit listrik sudah lama digunakan sehingga perlu dilakukan analisa untuk mengatahui performa dari HPH ini. Jika terjadi kebocoran atau kerusakan hanya dilakukan re-tubing yang selalu menggunakan design Original Equipment Manufacturing (OEM) yang memakan waktu cukup lama dan biaya yang mahal. Proses analisa yang dimaksudkan adalah re-design sehingga apabila terjadi kerusakan dapat diganti dengan buatan sendiri. Pada perancangannya digunakan analisa termodinamika dan perpindahan panas dengan metode LMTD untuk mendapatkan dimensi tiap zona. Perhitungan yang dilakukan meliputi menentukan panjang masing-masing tiap zona HPH, laju perpindahan panas, overall heat transfer coefficient (U), luas perpindahan panas (A), perhitungan pressure drop (∆p) untuk masing-masing zona. Hasil yang didapatkan pada analisa ini adalah dimensi zona desuperheating didapatkan panjang maksimal 2,94 m, luasan perpindahan panas efektif 231,7 m2, Overall Heat Transfer Coefficient 520,43 Watt/m2K, baffle spacing 0,345 m, jumlah baffle 8 buah. Pada zona Condensing didapatkan panjang maksimal 9,39 m, luasan perpindahan panas efektif 739,5 m2, Overall Heat Transfer Coefficient 3738,3 Watt/m2K, baffle spacing 1,8 m, jumlah baffle 4 buah. Sedangkan pada zona Subcooling didapatkan panjang maksimal 1,66 m, luasan perpindahan panas efektif 131 m2, Overall Heat Transfer Coefficient 3659,84 Watt/m2K, baffle spacing 0,345 m, jumlah baffle 4 buah. Sehingga didapatkan panjang total tube 14 m, total luasan perpindahan panas efektif 1.102,34 m2, Total Overall Heat Transfer Coefficient 733 Watt/m2K, total jumlah baffle 17 buah.

Performance of Four Step Engine Generator Set with Oxy-Hydrogen (HHO) Fuel from Water Electrolysis Process Using Vacuum Valve Carburator Theodorus Rendy Prasetya; Lathifa Putri Afisna; Devia G.C. Alfian; Rizky Faesal Sadikin
Journal of Renewable Energy and Mechanics Vol. 5 No. 02 (2022): REM VOL 5 NO 02 2022
Publisher : UIR PRESS

Alternative energy sources are required to lessen the environmental impact brought on by the usage of fossil fuels as a result of rising energy demand and rising fossil fuel use. One of the fuels that can be utilized to power generator sets is oxy-hydrogen gas. Oxy-hydrogen gas can be obtained from the electrolysis of water using environmentally friendly energy sources. This study aims to determine the effect of the use of oxy-hydrogen gas from the electrolysis of water as an alternative fuel, to find the performance parameters of the generator set engine using oxy-hydrogen fuel, to compare the performance of the generator set engine with oxy-hydrogen gas fuel with other fuels like pertalite fuel and a mixture of oxy-hydrogen gas and pertalite. The study used a 4 stroke gasoline engine generator set mounted with a vacuum valve type carburetor with a load of 1000 watts which is commonly used. From the results of the study, the performance parameters of the generator set were obtained using oxy-hydrogen fuel. The parameter value when the load is 1000 watts, the effective power of the generator is 1.035 kW, the torque value at 3.297 Nm, specific fuel consumption is 0.3658 kg/kW.hour, the thermal efficiency value is 12.05% and the average effective pressure value is 184.06 kPa.

Heat Transfer Characteristics of Hybrid Nanofluids Al2O3/ZnO as Working Fluid in Electronic Cooling Systems Devia Gahana Cindi Alfian
ROTASI Vol 24, No 4 (2022): VOLUME 24, NOMOR 4, OKTOBER 2022
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.24.4.65-71

The use of nanofluid as a working fluid to improve equipment performance has been growing recently. Utilization of nanofluid hybrids is the development of mono nanofluid to improve heat transfer performance which is still not maximized when using mono nanofluid. This research was conducted to determine the performance of hybrid nanofluids with composition of Al2O3/ZnO-Distilled Water as working fluids in electronic devices. The process of making hybrid nanofluids was carried out using a two-step method using an ultrasonic cleaner for 3 hours. Furthermore, the test was carried out by varying the ratio of Al2O3 and ZnO nanoparticles at 25%:75%, 50%:50%, 75%:25% at exactly 0.5% volume fraction. Based on the test results, adding nanoparticles can increase the heat transfer in the working fluid. The use of nanofluid hybrids at varying ratios of Al2O3:ZnO (50%:50%) with a flow rate of 0.7 L/min has the highest heat transfer coefficient value of 220.14 W/m2.oC at Reynolds Number 178.4 and requires pumping power of 0.649 W. Moreover, distilled water with a flow rate of 0.7 L/min has the heat transfer coefficient of 77.48 W/m2.oC at Reynolds Number 130.1 and requires a pump power of 0.425 W.

Uji Performa Gasoline Engine menggunakan bioaditif cengkeh dengan bensin berkadar oktan 90 Devia Gahana Cindi Alfian; Rico Aditia Prahmana; Dicky J. Silitonga; Abdul Muhyi; Didik Supriyadi
Journal of Science and Applicative Technology Vol 4 No 1 (2020): Journal of Science and Applicative Technology June Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Globally, the demand for fuels is ever-increasing and so is the demand for fuel additives. A fuel additive is a substance added in small quantities to increase the performance of the engine, decrease fuel consumption and reduce emission. The fuel additives have no specific set of raw materials or ingredients. Every fuel additive is different from the other in many ways of raw materials and ingredients to produce these additives. In many cases, fuel additives have made by chemical materials as additives for a gasoline engine. However, the optimal parameters for the reduction of fuel consumption are not clear. Accordingly, the present study performs a mixing additive material in the form of clove oil with pure gasoline fuel with a percentage of 1%, 0,6% and 0,3% from a total volume of gasoline to be tested. Then the mixing of the additive and gasoline is tested into the gasoline engine by varying the load using 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800 and 2000 Watt power with a fixed engine rotation of 2500 rpm. The results show that the reduction of fuel consumption respectively. Results showed that the addition of 1%, 0.6% and 0.3% clove oil into a 90 octane gasoline reduced fuel consumption by 10.6%, 18.2% and 15.4% respectively. Maximum reduction of fuel consumption was 28.6% at 800 W electrical load with 0.6% of clove oil additive.

Optimasi Multi Respon pada Proses End-Milling Glass Fiber Reinforced Polymer (GFRP) Dengan Menggunakan Metode Back Propagation Neural Network – Particle Swarm Optimization (BPNN-PSO) Fajar Perdana Nurullah; Abdul Muhyi; Devia Gahana Cindi Alfian
Journal of Science and Applicative Technology Vol 5 No 2 (2021): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v5i2.447

The use of composite materials continues to show an increasing trend in various fields such as sports, aviation and the military. This also increases the need for knowledge about the manufacturing process of composites. One of the most widely used composite materials is glass fiber reinforced polymer (GFRP). In the process of making components made from GFRP, one of the processes that is often used is end-milling. The studies that have been carried out on the GFRP end-milling process mostly use woven fibers, while research on machining of GFRP using combo fibers has not been widely conducted. This research was conducted to determine the effect of spindle speed, feeding speed, and cutting depth, on cutting forces, surface roughness, and delamination. In addition, multi response optimization is carried out using the combined method of BPNN-PSO to obtain the most optimal combination of machining parameters. The results shows that the optimal level of cut depth, spindle speed, and feeding speed are 1 mm, 4871 rpm and 788 mm / minute, respectively.

Pengaruh Komposisi Campuran Minyak Sereh Wangi dan Minyak Cengkeh terhadap Unjuk Kerja Mesin Diesel Rico Aditia Prahmana; Devia Gahana Cindi Alfian; Didik Supriyadi; Dicky Januarizky Silitonga; Abdul Muhyi
Journal of Science and Applicative Technology Vol 4 No 2 (2020): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v4i2.244

The increase in fuel prices makes the use of essential oils as a natural bio-additive in diesel engines much in demand. This is because essential oils are believed to have good content to improve engine performance and reduce fuel consumption. In this research, essential oils used are citronella oil because they contain carboxylic compounds (-COOH) and clove oil which has the advantage to prevent corrosion. The aim is to improve engine performance and reduce fuel consumption can also prevent corrosion. This research was conducted by mixing citronella oil and clove oil with diesel fuel with a percentage of 1%, 0.5%, and 0.1% of the total volume. The diesel engine is operated with a loading variation of 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, and 2000 W at a constant engine speed of 1500 rpm. The variables measured and calculated in this experiment are power, torque, Brake Mean Effective Pressure (BMEP), Specific Fuel Consumption (SFC). The results showed that the addition of citronella oil and clove oil to diesel fuel with a percentage of 0.1%, 0.5%, and 1% significantly reduced fuel consumption by 14.6%, 12.9%, and 18.3%, respectively. The maximum fuel reduction from mixed oils is only 0.086 liters/hour at 1000W loads with 1% bio-additives content.

ANALISIS KINERJA HIGH PRESSURE HEATER (HPH) TIPE SHELL AND TUBE HEAT EXCHANGER Devia Gahana
Journal of Science and Applicative Technology Vol 2 No 2 (2018): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Heat exchanger is one of the supporting production equipment that move the heat energy from one of fluid to another fluid flow. One example of a heat exchanger in power plant industry is High Pressure Heater (HPH). HPH is high pressure feedwater heater that using hot steam turbine waste product used as heating medium before entering the economizer on boiler to reduce the work of boiler. This research was conducted to determine the effective efficiency of High Pressure Heater at Power Plant Industry. This efficiency determination is based on thermodynamics and heat transfer analysis with Log Mean Temperature Difference (LMTD) method and Number of Transfer Unit (NTU) method. The analysis is to determining the effective heat transfer, overall heat transfer coefficient (U), Effectiveness and the analysis of pressure drop (âˆ†P). The analysis results obtained the efffective heat transfer of 37.013 kW, overall heat transfer coefficient (U) of 502,48, effectiveness of 0,47 and the number of pressure drop of 23.498,06 Pa.

Aplikasi Penggunaan Serah Wangi Sebagai Bioaditif Alami untuk Karakterasi Unjuk Kerja dari Mesin Diesel Abdul Muhyi; Rico Aditia Prahmana; Devia G. C. Alfian; Dicky J. Silitonga; Didik Supriyadi
Journal of Science and Applicative Technology Vol 3 No 1 (2019): Journal of Science and Applicative Technology August Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

The consumption of diesel fuel in Indonesia is increasing every year, one way to overcome this problem is to use natural bioaditive in the form of essential oils found in Indonesia. Essential oils used in this study are fragrant lemongrass because fragrant lemongrass contains carboxylic compounds (-COOH) [1,2,3]. With the aim of improving engine performance and reducing fuel consumption. This research was conducted by mixing fragrant citronella oil with diesel oil with a percentage of 1%, 0.5% and 0.1% of the total volume. Diesel engines are operated with variations in loading 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800 and 2000 W at a constant engine speed of 1500 rpm. The variables measured and calculated in this experiment are power, torque, Break Mean Effective Pressure (BMEP), Specific Fuel Consumption (SFC). The results showed that adding citronella oil to diesel fuel with a percentage of 1%, 0.5% and 0.1% significantly reduced fuel consumption by 15.5%, 3.6% and 2.6% respectively. The maximum reduction in fuel consumption reaches 0.055 liters / hour at 200W loading with a bioaditive level of 0.1%. The next study planned is to mix clove oil and citronella oil as bioaditive so that it is expected to reduce fuel consumption and engine corrosion. Keywords: Diesel engine, bioaditive, fragrant citronella oil, performance of diesel engines, fuel consumption

ANALISIS POTENSI ENERGI DAN PENGURANGAN EMISI CO2 DENGAN PENGELOLAAN LIMBAH PETERNAKAN SAPI RAKYAT DI KECAMATAN JATI AGUNG KABUPATEN LAMPUNG SELATAN Rinda Gusvita; Dian Fajarika; Mika Margareta; Devia Gahana CA
Journal of Science and Applicative Technology Vol 1 No 2 (2017): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Management of feedlot manure is becoming a larger responsibility as more regulations are imposed to protect water, both surface and groundwater, from manure contamination. Instead of using the manure for compost, feedlot owners can capture methane from the decomposing manure (and turn that into electricity or heat), or use the waste to produce liquid fuel. Biogas may also be called renewable natural gas because biogas can be used as a fuel source to produce electricity and heat like natural gas.This research converting energy generated from the measurement of total waste theoretically to be convert to electricity generated from the waste. Within the number of 19,398 total cows in Jati Agung Sub District husbandry has the potential to produce electric energy of 149,365.376 kwh per day or 15,836.79 mwh per year. The conversion from waste to electricity will reduce the number of total emission of 64,086.7464 tCO2 per year.

Implementasi Teknologi Microbubble Generator pada Pengolahan Limbah Cair Kotoran Sapi Devia Gahana Cindi Alfian; Lathifa Putri Afisna; Muhammad Syaukani; Ilham Dwi Arirohman; Harmiansyah Harmiansyah
AMMA : Jurnal Pengabdian Masyarakat Vol. 1 No. 09 (2022): AMMA : Jurnal Pengabdian Masyarakat
Publisher : CV. Multi Kreasi Media

Show Abstract | Download Original | Original Source | Check in Google Scholar

Along with the development of the cattle farming industry in Indonesia, many problems arise in terms of waste management. Cow dung waste processing becomes a challenge for the cattle farm industries, especially in handling the liquid waste. Liquid waste produced by cattle farming may pose a negative impact on the health of the people living around the cattle farm if it is not managed properly. One of the efforts to reduce environmental damage due to liquid waste from the farm is by utilizing microbubble generator (MBG) technology to decompose cow dung liquid waste into environmentally friendly waste. The aeration process that occurs in cow dung liquid waste helps aerobic microorganisms to better decompose liquid waste through the addition of dissolved oxygen produced by the microbubble generator in the water. As one of our community service programs, our team came up with an initiative to transfer the know-how of the MBG-based wastewater processing system to a local cattle farm, CV Sanjaya Farm. The program implementation method is by providing training and assistance in the application of MBG technology in the processing of cow dung liquid waste. With an active participation of both our team and partner sides, the MBG technology has been installed at our partner’s locations. As a result of the training and mentoring that we delivered at the partner farm, we observed an increase in the knowledge and skills of both leadership and staff of the partner farm in overcoming the problem of liquid waste management. In addition, a tangible solution has also been built for handling liquid waste to be disposed of into the surrounding environment in a safe and non-polluting manner.

Co-Authors Abdul Muhyi Achmad Gus Fahmi Adimas Anugrah Rivandy Agus Slamet Riyadi Ahmadien, Ichwan Kurnia Aji, Ahmad Frantoni Andhyka Tyaz Nugraha Andri Sanjaya Arirohman, Ilham Dwi Athallah Satrionindya Herlambang Auriyani, Wika Atro Carlodinho, Samuel Chaniago, Noverto Zhorif Damayanti Damayanti Desi Riana Saputri Devy Setiorini Sa’adiyah Dian Fajarika, Dian Dicky J. Silitonga Didik Supriyadi Didik Supriyadi Didik Supriyadi, Didik Dikri Uzlifah Janah Djatmiko Ichsani Eko Pujiyulianto Fajar Paundra Fajar Perdana Nurullah Firjatullah, Ahmad Labib Furkhan, M. Aulia G., Gita Christo Guita Normi Hadi Teguh Yudistira, Hadi Teguh Harmiansyah Hidayatullah, M Taufik Juhensen, Jodi Khaira, M. Irsyad Bin Iskandar Khariman, Muhammad Nur Na’im Kolala, Putra Andi Lathifa Putri A Lathifa Putri Afisna Manurung, Daniel Marcellino, Andrean Marone J Tambunan Meliala, Arvin Ade Guna Mika Margareta Muhammad Syaukani Muhammad Triyogo Adiwibowo Muhyi, Abdul Nicholas Binsar Pandapotan Nurullah, Fajar Perdana Paundra, Fajar Petrus, Bastian Roni Prahmana, Rico Aditia Prasetyo, Tri Wahyu Putra Hidayatulloh Riayatsyah, T. M. Indra Rico Aditia Prahmana Rifqi Sufra Rinda Gusvita Rizky Faesal Sadikin Saputra, Khamid Y. W. Silitonga, Dicky Januarizky Sindhu, I Gede Pande Naraya Sitanggang, Feldrico Andreas Sitorus, Jhonatan Jufrianto Taharuddin Taharuddin Taurista Perdana Syawitri, Taurista Perdana Theodorus Rendy Prasetya Veronika Viany Suswanto Yunasdi, Hamda Yunita Fahni Yusupandi, Fauzi

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