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All Journal Jurnal Pendidikan Teknologi dan Kejuruan Teknomekanik Journal of Engineering Researcher and Lecturer
Dori Yuvenda
Department of Mechanical Engineering, Faculty of Engineering, Universitas Negeri Padang, Indonesia
Chemical Engineering, Chemistry & Bioengineering Education Engineering Mechanical Engineering

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Experimental study on the use of wood pellet briquettes in rocket stoves for household energy needs Rafki Irianto; Yolli Fernanda; Primawati Primawati; Dori Yuvenda
Journal of Engineering Researcher and Lecturer Vol. 5 No. 1 (2026): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/jerel.v5i1.206

Abstract

This experimental study investigates the effect of air supply configurations on the combustion performance and thermal efficiency of wood pellet briquettes in rocket stoves for household energy use. With increasing global demand for energy and the depletion of fossil fuels, the shift to renewable biomass fuels, such as wood pellets, is essential to reduce carbon emissions and enhance energy efficiency. The study evaluates four airflow configurations: right fan only (F3), lower-left + right fans (F2+F3), two left fans (F1+F2), and all fans (F1+F2+F3). The results show that the F3 configuration achieved the fastest boiling time, highest boiling temperature, and lowest heat-loss temperature, indicating superior thermal performance. In contrast, configurations with higher airflow (F1+F2 and all fans) led to greater heat losses and slower boiling times, suggesting that excessive airflow can negatively affect efficiency. Additionally, the analysis of residual mass revealed that F3 and F2+F3 configurations produced the lowest residuals, indicating more complete combustion. This study provides important insights into optimising airflow configurations to improve the efficiency of biomass stoves. The findings offer practical implications for the design and operation of sustainable cooking technologies, promoting energy efficiency and reducing reliance on fossil fuels in households, particularly in rural areas.
Effectiveness of using video tutorial-based learning media in the SMAW welding techniques course Fadli Gunawan; Bulkia Rahim; Fathir Aspar; Dori Yuvenda
Jurnal Pendidikan Teknologi Kejuruan Vol 9 No 1 (2026): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jptk.v9i1.48823

Abstract

This study examined the effectiveness of video tutorial–based learning media in improving students’ mastery of horizontal-position Shielded Metal Arc Welding (SMAW) in a technical and vocational education and training (TVET) context. The study responded to the limited evidence on position-specific digital instructional media in welding education, particularly for horizontal-position SMAW practice, which requires precise control of movement, angle, and bead formation. A pre-experimental one-group pretest-posttest design was employed involving 30 Grade XI students in the Mechanical Engineering program at SMKN 1 Sumatera Barat. Data were collected using a validated 30-item performance assessment covering preparation, process, and final weld quality, and were analyzed using descriptive statistics and a paired-samples t-test in IBM SPSS Statistics. The results showed a substantial improvement in students’ performance after the intervention. The mean score increased from 47.57 in the pre-test to 81.70 in the post-test, with a mean gain of 34.13 points. The paired-samples t-test revealed a statistically significant difference, t(29) = 15.25, p < 0.001, and the effect size was very large (d = 2.78). These findings indicate that video tutorial–based media can serve as an effective, low-cost, and scalable instructional tool for procedural welding skills. The study contributes to digital pedagogy in TVET by highlighting the importance of pedagogical fit in technology-supported practical instruction.
Evaluation and characterization of charcoal briquettes using damar binder for sustainable energy Hendri Nurdin; Waskito Waskito; Dani Harmanto; Purwantono Purwantono; Andre Kurniawan; Dori Yuvenda; Yoszi Mingsih Anaperta
Teknomekanik Vol. 8 No. 1 (2025): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v8i1.33672

Abstract

Palm kernel shells have great potential as biomass and renewable energy sources. Its utilization has not been maximized which is only directly burned which causes air pollution. The accumulation of solid waste in the crude palm oil processing industry negatively impacts the environment. The research aims to determine the characteristics and quality of charcoal briquettes with palm kernel shell carbonization. The main findings of this study are the calorific value, water content, volatile matter, ash content, and fixed carbon in palm kernel shell charcoal briquettes with damar binder. The experimental research method was carried out by carbonizing the raw materials of palm kernel shell briquettes, applying various concentrations of damar binder mixtures. The technical parameters of briquette making were 10 MPa pressure, 60 mesh size, and different carbonization temperatures by furnace. The calorific and proximate were empirically measured by using a bomb calorimeter. This research produced palm kernel shell charcoal briquettes with a calorific value of 30.72 MJ/kg at a carbonization temperature of 500oC and concentration of 85%:15%, a moisture content of 5.18%, volatile matter of 32.72%, ash content of 2.81%, and fixed carbon of 57.90%. Palm kernel shell charcoal briquetting technology is potentially a recommended alternative solid fuel. Consequently, developing renewable energy that is environmentally friendly leads to achieve sustainable energy security. By utilizing waste, the negative impacts on the environment can be overcome and energy needs are also resolved.
Co-Authors - Primawati Andre Kurniawan Bulkia Rahim Dani Harmanto Fadli Gunawan Fathir Aspar Nurdin Hendri Purwantono Purwantono Rafki Irianto Waskito Yolli Fernanda Yoszi Mingsih Anaperta