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All Journal SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Jurnal Redoks TEKNIKA International Journal of Research in Vocational Studies (IJRVOCAS) IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) JPNM : Jurnal Pustaka Nusantara Multidisiplin
Sahrul Effendy
Politeknik Negeri Sriwijaya
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PERBANDINGAN NILAI BAKAR BRIKET BATUBARA DAN BRIKET ARANG (CAMPURAN CANGKANG BINTARO (Cerbera Manghas) DAN BAMBU BETUNG (Dendrocalamus Asper) Ida Febriana; Zurohaina Zurohaina; Sahrul Effendy
TEKNIKA: Jurnal Teknik Vol 6 No 1 (2019)
Publisher : Universitas IBA Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (303.203 KB) | DOI: 10.35449/teknika.v6i1.99

Abstract

Charcoal briquettes are smokeless fuels which are a type of solid fuel whose fly substance is made low enough so that the smoke generated on its utilization will not interfere with health. In this study charcoal briquettes were made from bintaro shell waste and betung bamboo using tapioca flour adhesives. This study aims to obtain the best quality sub-bituminous coal briquettes and coal briquettes. In this study the carbonization temperature used was 400ᵒC and the composition of raw materials for bintaro shells and betung bamboo was 50:50, the composition of raw materials for sub-bituminous coal and straw 90:10. The method used in this research is experiment or experimental method, with fuel value collection using ASTM D5865-03 standard. The results obtained from this study are for charcoal briquettes with 4000C carbonization temperature Inherent Moisture value of 1.91%, ash 2.29%, volatile matter 23.79%, fixed carbon 72.01% and calorific value 5878.7 kal / gr, and for coal briquettes obtained value Inherent Moisture 0.52%, ash 4.42%, volatile matter 17.98%, fixed carbon 77.08% and calorific value 7152.6 kal / gr. The fuel value of coal briquettes is greater than that of charcoal briquettes, but the combustion value of charcoal briquettes includes a good calorific value as an alternative energy source, and is in accordance with the SNI standard of 5000 kal / gr, even close to the Japanese standard 6000 cal / gr. Keywords: Bintaro, briquette, calorific value
Konsumsi Energi Pirolisator Kondensor Ganda Untuk Konversi Serbuk Kayu Jati Dan Meranti Menjadi Asap Cair Ida Febriana; Sahrul Effendy; Zurohaina; Venny Krysthin; Nova Fenoldi
Jurnal Redoks Vol. 8 No. 2 (2023): REDOKS JULI-DESEMBER
Publisher : Universitass PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/redoks.v8i2.9234

Abstract

Biomassa merupakan salah satu dari sekian banyak jenis sampah yang ramah lingkungan karena dapat didaur ulang menjadi barang yang bermanfaat jika dikelola dengan baik. Terdapat suatu metode yang cukup efektif untuk mengolah biomassa menjadi bernilai ekonomis yaitu dengan menggunakan metode pirolisis guna menghasilkan asap cair. Dilakukannya penelitian ini bertujuan untuk mengetahui jumlah konsumsi energi, total rendemen dan kualitas asap cair yang dihasilkan sesuai standar ASTM D7544. Proses pirolisis yang dilakukan ini memiliki variabel tetap berupa variabel bahan baku yaitu limbah serbuk kayu jati dan limbah serbuk kayu meranti dengan ukuran sampel yaitu 20-60 mesh sedangkan untuk variabel kendali, percobaan dilakukan dengan suhu 325⁰C. Dari hasil penelitian yang dilakukan, nilai konsumsi energi terendah diperoleh dari serbuk kayu meranti 60 mesh sebesar 9,08 kWh/l pada konsumsi daya 5,28 kWh dan total produk 0,581 liter, rendemen tertinggi sebesar 16% dari serbuk kayu jati 60 mesh, dan semua kondensat 1 asap cair dari masing-masing bahan baku sudah memenuhi standar fisik dari ASTM D7544 (densitas 1,1-1,3 gr/ml dan pH 2-3), serta standar kimia dari jurnal Maulina (2018) yaitu kadar asam 2,8-9,5% dan kadar fenol 0,2-2,9%.  
Pelatihan penulisan ilmiah dan sosialisasi dampak negatif plagiasi dan perjokian untuk mahasiswa Teknik Mesin Universitas Tamansiswa Palembang Boni Junita; Putri Afifa Nur Oktadina; Mutiara Putri; Muhammad Noviansyah Nugraha; Lety Trisnaliani; Sahrul Effendy
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 9, No 4 (2025): Juli
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v9i4.31728

Abstract

AbstrakPelatihan penulisan ilmiah dan sosialisasi dampak negatif plagiasi serta perjokian untuk mahasiswa Teknik Mesin Universitas Tamansiswa Palembang merupakan kegiatan pengabdian masyarakat dengan tujuan yaitu meningkatkan pemahaman dan keterampilan mahasiswa dalam penulisan karya ilmiah yang berintegritas. Kegiatan ini dilaksanakan sebagai respons terhadap maraknya kasus plagiarisme dan praktik perjokian di kalangan mahasiswa, yang disebabkan oleh faktor seperti tekanan akademik, kurangnya pemahaman tentang teknik penulisan, dan akses mudah terhadap jasa tidak etis. Metode pelaksanaan terdiri dari tiga tahap utama: pemaparan materi tentang penulisan ilmiah, sosialisasi dampak negatif plagiasi dan perjokian, serta pelatihan praktis penggunaan alat pendeteksi plagiarisme seperti Turnitin dan Grammarly. Mahasiswa peserta kegiatan yang terlibat aktif dalam diskusi interaktif dan praktik langsung. Hasil menunjukkan peningkatan signifikan dalam pemahaman mahasiswa mengenai teknik penulisan ilmiah, etika akademik, dan cara menghindari pelanggaran. Selain itu, mahasiswa juga memperoleh keterampilan menggunakan alat bantu untuk memastikan orisinalitas karya tulis. Kegiatan ini tidak hanya mengurangi risiko plagiarisme dan perjokian tetapi juga membangun budaya akademik yang jujur dan bertanggung jawab. Dampak jangka panjangnya adalah peningkatan kualitas lulusan dan reputasi institusi. Saran untuk keberlanjutan kegiatan ini adalah menjalin kerjasama lebih luas dan mengadakan pelatihan berkala untuk memastikan pemahaman yang berkelanjutan. Kata kunci: pelatihan; sosialisasi; penulisan ilmiah; plagiasi; perjokian. AbstractScientific writing training and socialization of the negative impact of plagiarism and cheating for Mechanical Engineering students of Tamansiswa University Palembang is a community service activity with the aim of increasing students' understanding and skills in writing scientific papers with integrity. This activity was carried out in response to the rampant cases of plagiarism and cheating among students, caused by factors such as academic pressure, lack of understanding of writing techniques, and easy access to unethical services. The implementation method consisted of three main stages: material presentation on scientific writing, socialization of the negative impact of plagiarism and cheating, and practical training on the use of plagiarism detection tools such as Turnitin and Grammarly. Students participating in the activity were actively involved in interactive discussions and hands-on practice. The results showed a significant increase in students' understanding of scientific writing techniques, academic ethics, and how to avoid violations. In addition, students also acquire the skills to use tools to ensure the originality of the written work. These activities not only reduce the risk of plagiarism and cheating but also build an honest and responsible academic culture. The long-term impact is to improve the quality of graduates and the reputation of the institution. Suggestions for the sustainability of this activity are to establish wider cooperation and conduct periodic training to ensure continuous understanding. Keywords: training; socialization; scientific writing; plagiarism; cheating.
Pengembangan Aplikasi Tabel Uap Portabel yang Mengintegrasikan IAPWS-IF97 dan CoolProp untuk Analisis Termodinamika Agus Manggala; Muhammad Yerizam; Sahrul Effendy
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.351

Abstract

The advancement of modern thermodynamic technology requires educational software capable of accurately calculating and visualizing the thermophysical properties of water and steam in accordance with the IAPWS-IF97 Industrial Formulation. This study presents the development of a standalone Python-based Steam Table application that integrates two thermodynamic property calculation backends, IAPWS-IF97 and CoolProp, into a single executable (.exe) package that operates without any additional installation. The application performs real-time calculations of thermodynamic properties, including enthalpy, entropy, pressure, and temperature, and provides interactive visualizations on h–s (Mollier) and T–s diagrams. The novelty of this research lies in integrating dual thermodynamic engines into an automated build-release system based on batch scripting, enabling efficient, reproducible compilation, version control, and distribution. Validation results show that the application operates stably in Windows 10–11 environments without external dependencies, producing results consistent with the IAPWS-IF97 reference tables, with a maximum deviation of less than ±0.05% across all tested state points. This tool is expected to serve as a lightweight, open-source, and adaptable platform for thermodynamic learning and research, particularly for studies involving the Rankine cycle, steam power plants (PLTU), and geothermal energy systems.
Pengembangan Perangkat Lunak Simulasi PLTU Menggunakan Excel VBA untuk Aplikasi Rekayasa Agus Manggala; Yerizam Yerizam; Sahrul Effendy
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 2 (2025): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i2.232

Abstract

Coal-fired steam power plants (PLTU) remain essential in electricity generation, especially in countries with abundant coal resources. Thermodynamic modeling based on the Rankine cycle is crucial for both educational and design purposes, but commercial software is often costly and less accessible. This study develops a low-cost simulation tool using Microsoft Excel and VBA to model the Rankine cycle in PLTU systems. Users can input operating parameters, calculate thermodynamic properties using IAPWS-IF97 formulations, and evaluate system efficiency through energy balance analysis. The user-friendly interface features real-time efficiency graphs and energy flow diagrams. Validation results show deviations of less than 5% for key parameters, making this tool effective for engineering education, preliminary feasibility studies, and local research in thermal power generation.
Ultrasonic-Assisted Alkaline Pretreatment for Enhanced Bioethanol Production from Water Hyacinth (Eichhornia crassipes) Biomass Alya Fazza; Rizky Dwi Ramadhon; Sahrul Effendy; Yohandri Bow; Zurohaina
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 6 No. 2 (2026): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v6i2.529

Abstract

Water hyacinth (Eichhornia crassipes) is an abundant lignocellulosic biomass with strong potential as a feedstock for bioethanol production, but its relatively high lignin content limits the accessibility of cellulose and inhibits the subsequent hydrolysis process. This study aims to analyze the effect of ultrasonic-assisted pretreatment duration and NaOH concentration on the lignocellulosic composition and the resulting bioethanol yield from water hyacinth biomass. Pretreatment was carried out at 60°C and 60 W power with time variations of 10, 15, 20, 25, and 30 minutes and NaOH concentrations of 1 M and 2 M. The pretreated samples were analyzed for lignin, cellulose, and hemicellulose content using the Chesson method, then hydrolyzed with 3% H2SO4, fermented for 120 hours using Saccharomyces cerevisiae, distilled, and characterized. The results showed that the optimum pretreatment condition was obtained at a treatment time of 25 minutes with 2 M NaOH, which reduced the lignin content from 12.1% to 5.4%, reduced the hemicellulose content to 10.8%, increased the cellulose content from 56.0% to 75.1%, and produced the highest glucose content of 8.2%. Under these optimum conditions, the resulting bioethanol had an ethanol content of 14%, a density of 0.980 g/mL, a pH of 6.5, and a distillate volume of 42 mL. Gas chromatography-mass spectrometry analysis further confirmed ethanol as the dominant compound in the distillate, supporting the validity of the refractometric measurement. Beyond 25 minutes of pretreatment, however, the lignin content, cellulose content, and bioethanol yield all showed a slight decline, indicating that excessively prolonged ultrasonic exposure can degrade part of the biomass structure and reduce process efficiency. Overall, these results indicate that ultrasonic pretreatment combined with 2 M NaOH effectively enhances delignification and improves the potential for bioethanol production from water hyacinth biomass, although further optimization is still required to achieve a fuel-grade ethanol content.
Analisis Pengaruh Kotoran Sapi Pada Digester Terhadap Produksi Metana Dan Nilai Kalor Biogas Berbasis Limbah Cair Tahu Bertand Nibroos Qobus; M. Hermansyah; Safril Kartika Wardana; Sahrul Effendy; Idha Silviyati
JPNM Jurnal Pustaka Nusantara Multidisiplin Vol. 4 No. 4 (2026): October : Jurnal Pustaka Nusantara Multidisiplin (ACCEPTED)
Publisher : SM Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59945/jpnm.v4i4.1591

Abstract

Limbah cair tahu merupakan limbah organik yang berpotensi dimanfaatkan sebagai bahan baku biogas melalui proses fermentasi anaerob. Penambahan kotoran sapi sebagai inokulum diharapkan dapat meningkatkan aktivitas bakteri metanogen sehingga produksi metana dan kualitas biogas meningkat. Penelitian ini bertujuan menganalisis pengaruh persentase penambahan kotoran sapi terhadap komposisi biogas, produksi metana, dan nilai kalor biogas berbasis limbah cair tahu. Penelitian dilakukan menggunakan digester tipe batch berkapasitas 100 L dengan volume substrat 80 L, suhu fermentasi 33°C, waktu fermentasi 4 hari, serta variasi penambahan kotoran sapi sebesar 10%, 20%, 30%, 40%, 50%, dan 60%. Parameter yang diamati meliputi volume substrat, komposisi biogas (CH₄, CO₂, O₂, H₂S, dan CO), serta nilai kalor biogas. Kandungan metana meningkat dari 22,1% menjadi 63,4%, sedangkan nilai kalor meningkat dari 7,91 MJ/m³ menjadi 22,70 MJ/m³. Kandungan CO₂ dan H₂S meningkat, O₂ menurun, sedangkan CO berada pada kisaran 470,3–910,2 ppm. Variasi penambahan kotoran sapi sebesar 60% menghasilkan kualitas biogas terbaik dengan kandungan metana dan nilai kalor tertinggi. Hasil penelitian menunjukkan bahwa penambahan kotoran sapi berpengaruh positif terhadap peningkatan produksi metana dan kualitas biogas, sehingga berpotensi dikembangkan sebagai sumber energi terbarukan sekaligus alternatif pengolahan limbah organik.
Co-Authors Agus Manggala Alya Fazza Bertand Nibroos Qobus Boni Junita Ida Febriana Idha Silviyati Lety Trisnaliani M. Hermansyah Muhammad Noviansyah Nugraha Muhammad Yerizam Mutiara Putri Nova Fenoldi Putri Afifa Nur Oktadina Rizky Dwi Ramadhon Safril Kartika Wardana Venny Krysthin Yohandri Bow Zurohaina Zurohaina Zurohaina