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Tulus Burhanuddin Sitorus
Departemen Teknik Mesin Fakultas Teknik, Universitas Sumatera Utara, Universitas Sumatera Utara
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation

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Pengaruh Bahan Bakar Biodiesel dari Dimetil Ester Terhadap Kinerja Mesin Diesel Empat Langkah Sitorus, Tulus Burhanuddin; Zebua, Yosua F.S.R; Sinaturi, Daniel F.B; Siagian, Jonathan A.R; -, Suprihatin; Siagian, Lestina
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 3 No 2 (2022): Edisi Februari 2022
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (823.123 KB) | DOI: 10.36655/sprocket.v3i2.649

Abstract

This study aims to determine the effect of biodiesel fuel from dimethyl ester on four-stroke stationary diesel engines' performance and exhaust emissions. Tests were carried out using B10 and B30 fuels with engine speed variations and load variations without modifying the engine. The results showed that the torque, power, and thermal efficiency tended to decrease when using B10 and B30. In addition, the specific fuel consumption has increased when the engine uses B10 and B30. But exhaust emissions of CO and unburned hydrocarbon (UHC) decreased NOx and increased CO2 when the engine uses B10 and B30. This research also obtains the correlations and regression equations involving engine performance parameters.
PERFORMANSI MESIN DIESEL MENGGUNAKAN BIODIESEL DARI CAMPURAN BIJI KARET-MINYAK PIROLISIS LIMBAH PLASTIK-MINYAK SOLAR Sitorus, Tulus Burhanuddin; Tambunan , Bisrul Hapis; Sihombing , Hendrik Voice; Ambarita, Himsar
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.1765

Abstract

This research examines the performance of a Diesel engine that uses alternative fuel biodiesel from a mixture of rubber seeds with plastic waste pyrolysis and diesel oil. The plastic waste used is plastic bottle caps, which are processed by pyrolysis to obtain oil. One of the objectives of mixing biodiesel with plastic waste pyrolysis oil is to increase the calorific value of rubber seed biodiesel. The calorific value of rubber seed biodiesel is 39.95 kJ/kg, and the calorific value of plastic waste pyrolysis oil is 46.55 kJ/kg. Mixing rubber seed biodiesel with plastic waste pyrolysis oil increases the calorific value of rubber seed biodiesel by around 9.63%-13.63%. Experimental results show that there is a reduction in exhaust emissions when using biodiesel for opacity of 7.51-66.08%, CO 12.5-50%, HC 7.14-62.96% and an increase in CO2 emissions of around 3.08-84.62%. Tests using biodiesel were carried out without modifying the Diesel engine.
Performance and Emission Assessment of Tree-Based Biofuel Additives in Compression Ignition Engines: A Review Ilmi , Ilmi; Sitorus, Tulus Burhanuddin; Siagian, Parulian; Sihombing, Roland
Journal of Renewable Engineering Vol. 3 No. 1 (2026): JORE - February
Publisher : Pt. Anagata Sembagi Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62872/89zh4557

Abstract

This study reviews the performance and emissions of compression ignition (CI) engines using Calophyllum inophyllum (CIME/tamanu)-based biofuel additives through a narrative review of the latest international literature. Inclusion criteria encompassed CI engine test studies reporting efficiency metrics (BTE, BSFC) and key emissions (CO, HC, NOx, smoke/PM) for CIME blends (B10–B100) both without and with additive/mitigation strategies. In general, compared to diesel, CIME reduced CO, HC, and smoke/PM, with a trade-off increase in NOx. The addition of oxygenated additives (e.g., n-pentanol, dimethyl carbonate) and ignition improvers (e.g., DTBP) tends to improve combustion quality, reduce BSFC, and suppress CO/HC; while the application of approximately 10% EGR effectively reduces NOx with a moderate penalty on HC/CO/smoke. Nano-additives (graphene/MWCNT) show potential for increasing BTE and reducing smoke, but present issues of dispersion stability and safety/environment. The most balanced performance generally occurs at low–medium blends (≈B10–B20) combined with oxygenated additives and EGR-based NOx control, accompanied by proper injection calibration. From a sustainability perspective, C. inophyllum—as a non-food source with high FFA pretreatment requirements—has the potential to support transportation decarbonization, although industrial-scale success depends on supply chains, policies, and LCA/TEA results. Further studies are recommended on real-world test cycles, long-term durability, aftertreatment compatibility, and comprehensive environmental assessment.
Study on Thermoelectric Cooler Driven by Solar Energy in Medan City Sitorus, Tulus Burhanuddin; Lubis, Zulkifli; Ariani, Farida; Sembiring, Ferry
EMITTER International Journal of Engineering Technology Vol 6 No 2 (2018)
Publisher : Politeknik Elektronika Negeri Surabaya (PENS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1352.369 KB) | DOI: 10.24003/emitter.v6i2.303

Abstract

The primary purpose of this study is to investigate the performance of thermoelectric cooler driven by solar energy in Medan city, Indonesia. This cooler able to use in a remote area where electricity is still not available. The cooler could be used to store beverage that must be stored at low temperatures to maintain the freshness such as drink cup. The solar thermoelectric cooler is based on the principles of a thermoelectric module or Peltier effect to create a hot side and a cold side. The cold side of the thermoelectric module is utilized for cooling purposes to the cooling space. The heat from the hot side of the module is rejected to ambient surroundings by using heat sinks and fans. The solar thermoelectric cooler was experimentally tested for the cooling purpose. Experimental results showed that the solar thermoelectric cooler could reduce the temperature of the drink cup from 26oC to 15oC in approximately 40 min. The maximum COP of the cooling system during the experiment was calculated and found to be about 0.356. The effect of weather conditions on the COP value was about 85.90%.
Ocean Clean Energy: Optimizing the Use of Solar Panels to Increase Cooling Storage Efficiency for Fishermen in Sibolga Towards Sustainability and Climate Change Mitigation Tulus Burhanuddin Sitorus; Yasmine Anggia Sari; Sarah Patumona Manalu; Hendrik Voice Sihombing; Ahmad Yunus Nasution; Mhd Azmy Vizzyansjah Lubis; Ananda El Shaddai Oktavia Siahaan; Muhammad Rizky Maulizar
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 10 No. 2 (2025): ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/abdimastalenta.v10i2.18685

Abstract

This community service activity aims to improve fishermen's welfare in Sibolga City by implementing more efficient technology. The main focus is enhancing fresh fish storage efficiency using refrigeration systems that utilize alternative energy. The activities involving faculty and students from the University of North Sumatra include raising awareness about alternative energy, promoting the use of solar panels, and installing them directly on fishing boats at Sibolga Harbor. The results of this initiative demonstrate increased awareness among fishermen about the importance of clean and sustainable energy. It is hoped that this will improve the quality of the catch, reduce operational costs, and contribute to local climate change mitigation efforts.
Blade curvature as a key driver of conical-basin gravitational vortex turbine performance: experimental evidence Andianto Pintoro; Himsar Ambarita; Farel Hasiholan Napitupulu; Tulus Burhanuddin Sitorus; Taufiq Bin Nur; Ilmi Abdullah; Rimbawati Rimbawati
SINERGI Vol. 30 No. 3 (2026)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2026.3.001

Abstract

This study investigates the role of runner blade curvature in enhancing the performance of Gravitational Water Vortex Turbines (GWVTs) for low-head hydropower applications. Despite growing interest in GWVT technology, previous studies typically vary multiple geometric parameters simultaneously, leaving the isolated effect of blade curvature radius insufficiently understood. To address this research gap, an experimental investigation was conducted using a conical-basin GWVT with three runner configurations having identical blade inclination (66°) but different curvature radii (0.10 m, 0.20 m, and 0.30 m). Experiments were performed under controlled flow rates of 800, 1025, and 1300 LPM. Turbine torque, rotational speed, mechanical power, and efficiency were measured using a Prony brake dynamometer and magnetic tachometer. Each test condition was repeated three times, and the resulting data were analyzed using mean and standard deviation analysis to ensure measurement reliability and experimental consistency. The results show that increasing blade curvature significantly improves hydrodynamic interaction between the vortex flow and the runner. The runner with a curvature radius of 0.30 m achieved the best performance, producing a peak torque of 15.92 Nm, mechanical power of 109.95 W, and maximum efficiency of 66.43% at moderate flow conditions. The findings establish a direct curvature-performance relationship, demonstrating that larger curvature enhances tangential momentum transfer, prolongs blade-vortex interaction, and improves torque generation in low-head vortex systems. This study empirically confirms blade curvature as the key parameter governing hydrodynamic coupling and energy extraction in GWVT runners, while providing a practical design guideline to improve efficiency in low-head decentralized micro-hydropower systems.
Co-Authors Ahmad Yunus Nasution Ahmad Yunus Nasution Alexander, Ryan Alfian Hamsi Ananda El Shaddai Oktavia Siahaan Andi Syahputra Andianto Pintoro Arief Hariyanto David Chandra Elisabeth Ginting Farel Hasiholan Napitupulu Farida Ariani Gabriel Alexandro Sembiring Ginting, Elizabeth Hendrik Voice Sihombing Himsar Ambarita Himsar Ambarita Ilmi , Ilmi Ilmi Abdullah Irfandi, Ridha Jaya Arjuna Joi Jogi Pakpahan Lubis, Syaifuddin Manik, Terang U. H. S. G. Manik, Terang U.H.S. Ginting Manik, Terang UHS Ginting Manik, Terang UHSG Mhd Azmy Vizzyansjah Lubis Muhammad Ibrahim Syah Muhammad Reihan Triandhika Muhammad Rizky Maulizar Mulfi Hazwi Nasution, Ahmad Y Nur, Taufiq Bin Parulian Siagian Rachmat Kentardjo Rimbawati - Rimbawati Sarah Patumona Manalu Sembiring, Ferry Sembiring, Ferry Siagian, Jonathan A.R Siagian, Lestina Sihombing , Hendrik Voice Sihombing, Roland Sinaturi, Daniel F.B Siti Qeisya Puandhani Siregar Situmorang, Mangontang Suprihatin - Syahrul Abda Tambunan , Bisrul Hapis Tanadi, Derrick Tania Alda Tekad Sitepu Wiranto Arismunandar Yasmine Anggia Sari Zebua, Yosua F.S.R Zulkifli Lubis