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All Journal Jurnal Pendidikan Teknologi dan Kejuruan Jurnal Konversi Energi dan Manufaktur
Afiah, Syifa Kawakib Nurul
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Aerospace Engineering Automotive Engineering Education Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Performance and Efficiency Comparison of Human Waste Biogas and LPG Production in Modified Water Pump Engines Anggrainy, Rani Anggrainy; Afiah, Syifa Kawakib Nurul; Latiep, Abdul; Sukrawan, Yusep; Noor, Ridwan Adam Muhamad; Nurhaliza, Tiana; Fauzi, Virgi Ahmad; Abdurrahman, Fajar
Jurnal Konversi Energi dan Manufaktur Vol. 10 No. 2 (2025)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.10.2.7

Abstract

As daily needs and fuel prices continue to rise and non-renewable natural resources diminish, alternatives are needed to replace these energy sources with renewable energy. Data from the National Energy Council shows that in Indonesia, only 16.358 household biogas digester units have been installed, or about 1.6% of the total potential that can be utilized. This research aims to compare the performance of biogas from human feces with liquefied petroleum gas (LPG) as fuel for water pump engines. The method used is experimental, involving the modification of the carburetor on the water pump engine, followed by direct measurement and analysis of the water pump results using variations of biogas and LPG fuels. A literature review indicates that biogas has great potential as a renewable energy source, but its utilization in Indonesia remains very limited. In this study, the test variables include variations in pump speed at 3800, 5300, and 6600 rpm. The test results show that the mass flow rate of biogas compared to LPG yields the highest discharge at 6600 rpm (0.118: 0.150 m³/s). For both biogas and LPG fuels, the maximum shaft power of the water pump engine reaches 3.9 kW at 6600 rpm. The maximum waterpower generated by the water pump engine using biogas and LPG is 1.26 kW and 1.6 kW at 6600 rpm, respectively, while the maximum efficiency reaches 32% with biogas and 41% with LPG. Therefore, the higher the water pump engine speed, the higher the values of shaft power, engine power, discharge, and efficiency. The efficiency ratio comparison between biogas and LPG at 6600 rpm is 3:4.
Automotive students' interest in e-commerce entrepreneurship: An exploration through a quantitative descriptive approach Noor, Ridwan Adam M; Maulana, Indra; Gifari, M Maris Al; Samosir, Daniel Moses; Wiyono, Apri; Afiah, Syifa Kawakib Nurul
Jurnal Pendidikan Teknologi Kejuruan Vol 8 No 3 (2025): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jptk.v8i3.46423

Abstract

This study explored the entrepreneurial interest in e-commerce among vocational high school students in the Motorcycle Engineering and Business program, with a focus on motorcycle spare parts sales. A descriptive quantitative approach was applied through a survey method involving 80 students. A questionnaire was employed to assess the level of entrepreneurial interest as well as the influencing factors, both intrinsic and extrinsic. The findings indicated that students’ interest in e-commerce entrepreneurship was at a moderate level, with intrinsic factors accounting for 56.98% and extrinsic factors for 43.02%. Motivation emerged as the most dominant intrinsic factor (14.51%), followed by perception, enjoyment, experience, and character. On the extrinsic side, the family environment exerted the strongest influence, followed by school and community. These results underscored the need to strengthen students’ digital entrepreneurial interest through contextual learning, hands-on activities, and supportive environments. The study also reinforced the relevance of Self-Determination Theory in explaining how intrinsic motivation influenced students’ entrepreneurial intentions in the digital economy.
Co-Authors Abdurrahman, Fajar Anggrainy, Rani Anggrainy Apri Wiyono Fauzi, Virgi Ahmad Gifari, M Maris Al Indra Maulana, Indra Latiep, Abdul Noor, Ridwan Adam M Noor, Ridwan Adam Muhamad Nurhaliza, Tiana Samosir, Daniel Moses Sukrawan, Yusep