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All Journal Journal of Energy, Mechanical, Material and Manufacturing Engineering ABDI UNISAP: Jurnal Pengabdian Kepada Masyarakat ⁠International Journal of Sustainable Social Culture, Science Technology, Management, and Law Humanities
Ahmad Robittah
Politeknik Unggulan Kalimantan
Humanities Automotive Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Engineering Environmental Science Languange, Linguistic, Communication & Media Mechanical Engineering Social Sciences Other

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Optimization of torrefaction temperature on the physical and chemical properties of ironwood (Eusideroxylon zwageri) as an alternative biofuel Ichwan Noor Ardiyat; Noor Rahman; Jarot Wijayanto; A'yan Sabitah; Ahmad Robittah
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 10 No. 2 (2025)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v10i2.42340

Abstract

This study aims to investigate the effect of torrefaction temperature on the physical and chemical properties of ironwood (Eusideroxylon zwageri) and to evaluate its potential as an alternative biofuel. Torrefaction was carried out at 200°C, 250°C, and 300°C for 150 minutes under oxygen-limited conditions, and the resulting char, tar, and gas yields were quantified, while chemical changes were analyzed using Fourier Transform Infrared Spectroscopy (FTIR). The results indicate that increasing temperature significantly affects product distribution, with the highest char yield (52%) obtained at 250°C and increased gas formation at 300°C. FTIR analysis revealed a progressive reduction of hydroxyl (O–H) and carbonyl (C=O) functional groups, indicating enhanced deoxygenation and carbonization at higher temperatures. These chemical transformations suggest improved thermal stability and fuel quality of the torrefied ironwood. It can be concluded that Eusideroxylon zwageri has strong potential as a renewable biofuel feedstock, with torrefaction at 250°C being the most suitable condition for solid biofuel production.
Penerapan Teknologi Tepat Guna Alat Pengering pada Produksi Bedak Dingin Bunga Tanjung Muhammad Zaini; Yuliana Salman; Muhammad Akbar Hariyono; Ahmad Robittah; Blegoh Iwan Santoso
ABDI UNISAP: Jurnal Pengabdian Kepada Masyarakat Vol. 4 No. 1 (2026): ABDI UNISAP: Jurnal Pengabdian Kepada Masyarakat
Publisher : UPT Publikasi dan Penerbitan Universitas San Pedro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59632/abdiunisap.v4i1.695

Abstract

Bedak dingin Bunga Tanjung merupakan produk kosmetik tradisional khas Kalimantan Selatan yang proses produksinya masih menghadapi kendala pada tahap pengeringan. Selama ini pengeringan dilakukan menggunakan sinar matahari sehingga sangat bergantung pada kondisi cuaca dan menyebabkan penurunan produktivitas pada musim penghujan. Kegiatan Pengabdian kepada Masyarakat (PKM) ini bertujuan menerapkan teknologi tepat guna berupa alat pengering bedak dingin berbasis energi listrik untuk meningkatkan efisiensi produksi dan higienitas proses pengeringan. Metode pelaksanaan meliputi identifikasi permasalahan dan kebutuhan mitra, perancangan dan pembuatan alat pengering, penyerahan dan pelatihan penggunaan alat, serta monitoring dan evaluasi penerapan teknologi. Alat pengering yang dihibahkan terdiri atas dua unit lemari pengering berbahan galvanis yang dilengkapi lampu pijar sebagai sumber panas dan thermostat controller untuk pengaturan suhu. Hasil kegiatan menunjukkan bahwa penggunaan alat pengering mampu mempercepat waktu pengeringan dari tiga hari menjadi satu hari per siklus produksi atau tiga kali lebih cepat dibandingkan metode konvensional. Dua unit alat pengering menghasilkan kapasitas produksi sebesar 75 pak atau setara 1.800 bungkus per siklus dengan proses yang lebih higienis karena terlindung dari kontaminasi debu dan mikroorganisme. Tingkat pemanfaatan alat mencapai 100% dan seluruh proses pengeringan telah beralih dari metode tradisional ke metode berbasis teknologi. Penerapan alat pengering terbukti meningkatkan efisiensi, produktivitas, dan kualitas proses produksi bedak dingin Bunga Tanjung.
Parametric Analysis of Reynolds Number Effects on Wake Region Characteristics in LBM-Based Fluid Flow Simulations Aulia Rahman; Putra Dwiantoko; Novan Habiburrahman; Djarot Winoto; Ahmad Robittah; Reinaldo Evan Audrey
⁠International Journal of Sustainable Social Culture, Science Technology, Management, and Law Humanities Vol. 3 No. 1 (2026)
Publisher : Universitas Kristen Cipta Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71131/j7cd2273

Abstract

This study investigates the fundamental fluid dynamics of steady-state laminar flow past a circular cylinder using the Lattice Boltzmann Method (LBM) with a D2Q9 lattice arrangement. Developed using a vectorized Pythonic approach, the numerical solver employs the Bhatnagar-Gross-Krook (BGK) collision operator to resolve the mesoscopic particle distribution functions. The research focuses on the flow characteristics at low Reynolds numbers (Re) ranging from 20 to 70 to ensure stable convergence toward steady-state conditions. Results demonstrate that the LBM effectively captures critical hydrodynamic phenomena, including stagnation points, flow acceleration due to blockage effects, and the development of symmetric wake regions. Analysis reveals a linear correlation between increasing Reynolds numbers and the longitudinal elongation of the recirculation zone, confirming the solver's ability to maintain numerical stability and momentum conservation without the computational expense of conventional pressure-velocity coupling. These findings validate the use of open-source computational tools for rigorous fluid flow analysis and provide a robust dataset for future integration with multi-scale modeling and machine learning frameworks, such as Physics-Informed Neural Networks (PINNs).
Design And Implementation Of An Embedded Temperature Control System For Laboratory-Scale Pyrolysis Applications Ahmad Robittah; Ahmad Faqih Habibi; Hafiz Al Farizi; Muhammad Akbar Hariyono; Achmadi; Aulia Rahman
⁠International Journal of Sustainable Social Culture, Science Technology, Management, and Law Humanities Vol. 3 No. 1 (2026)
Publisher : Universitas Kristen Cipta Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71131/qbvtmd78

Abstract

Accurate and stable temperature control is essential in laboratory-scale thermal processing, as it directly influences process stability, operational safety, and experimental reproducibility. However, many laboratory thermal systems still rely on manual regulation or simple heating mechanisms without adequate feedback control, resulting in temperature fluctuations and inconsistent performance. This study presents the design and implementation of an embedded temperature control system for laboratory-scale thermal processing, using pyrolysis as an application case study. The proposed system is based on a closed-loop control architecture that integrates a K-type thermocouple, a microcontroller-based control unit, and an electrical heating actuator. A hysteresis-based on–off control strategy is implemented to regulate the heating process and maintain the desired temperature setpoints. The system performance is experimentally evaluated at operating temperatures of 300 °C, 400 °C, and 500 °C under different processing durations. Experimental results demonstrate that the developed system provides stable and reliable temperature regulation across all tested conditions. The system exhibits a rapid heating response, minimal overshoot, and acceptable steady-state temperature deviations, even at elevated operating temperatures. Long-duration operation confirms the robustness and reliability of the control strategy. These results indicate that the proposed embedded temperature control system offers a practical and cost-effective solution for laboratory-scale thermal processing applications requiring stable and repeatable temperature control.
Co-Authors A'yan Sabitah Achmadi Ahmad Faqih Habibi Aulia Rahman Aulia Rahman Djarot Winoto Hafiz Al Farizi Hariyono, Muhammad Akbar Ichwan Noor Ardiyat Jarot Wijayanto Muhammad Zaini Noor Rahman Novan Habiburrahman Putra Dwiantoko Reinaldo Evan Audrey Santoso, Blegoh Iwan Yuliana Salman