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All Journal JIPTEK Toplama Jurnal Pengabdian Kepada Masyarakat Kalam
Edi Tri Astuti
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Pembuatan Briket Bioarang Dari Campuran Eceng Gondok Kering dan Limbah Plastik HDPE Menggunakan Mesin Press Sederhana Astuti, Edi Tri; Maulana, Yosef
Jurnal Inovasi Ilmu Pengetahuan dan Teknologi (JIPTEK) Vol. 5 No. 1 (2023): Jurnal Inovasi Ilmu Pengetahuan dan Teknologi
Publisher : Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/jiptek.v5i1.35235

Abstract

Penggunaan bahan bakar fosil di Indonesia semakin meningkat dan berakibat pada menipisnya cadangan bahan bakar. Sementara itu, potensi sumber energi terbarukan dari biomassa sangat melimpah, salah satunya adalah eceng gondok (Eichornia crassipes). Eceng gondok mengandung senyawa sumber kalori seperti selulosa, lignin, pentosa, dan beberapa mineral, namun kualitas briket eceng gondok masih di bawah standar. Meningkatnya timbunan limbah plastik menimbulkan masalah lingkungan karena plastik sulit terurai oleh alam. Di sisi lain, limbah plastik khususnya High Density Polyethylene (HDPE) memiliki potensi untuk meningkatkan nilai kalor briket eceng gondok. Penelitian ini dilakukan untuk mengetahui pengaruh tar HDPE terhadap karakteristik fisik dan kimia briket bioarang eceng gondok, serta mengetahui kualitas briket eceng gondok dengan tambahan tar HDPE. Variasi campuran briket yang digunakan adalah 20 EG:80 HDPE, 40 EG:60 HDPE, dan 60 EG:40 HDPE. Proses pengarangan tanpa adanya oksigen digunakan untuk memproses biomassa sehingga terjadi penyusutan dari 50 kg enceng gondok basah menjadi 1 kg arang dan 1,5 kg limbah plastik menjadi 1 kg arang. Cetakan briket berdimensi 2,5 cm x 3 cm x 2,5cm dengan tekanan kempa 3 ton selama 4 menit. Hasil penelitian menunnjukkan bahwa briket bioarang eceng gondok komposisi 20 EG:80 HDPE memiliki nilai kalor 5240 kal/g, nyala api 1,93 menit dan laju pembakaran 0,50 g/menit. Komposisi 40 EG:60 HDPE memiliki nilai kalor 5567 kal/g, nyala api 1,95 menit dan laju pembakaran 0,57 g/menit. Sedangkan komposisi 60 EG:40 HDPE memiliki nilai kalor 5325 kal/g, nyala api 1,93 menit dan laju pembakaran 0,55 g/menit.
Peragaan Perangkat Optik Untuk Pengukuran Teknik di SMK (Sekolah Menengah Kejuruan) Sasmita Jaya 2, Pamulang Barat, Tangerang Selatan Solihat, Ihat; Mahendrawan, Ersam; Astuti, Edi Tri
Jurnal Pengabdian Kepada Masyarakat Kalam Vol. 5 No. 1 (2026): Pembedayaan Masyarakat Desa Berorientasi Local Genius
Publisher : Prisani Cendekia

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Abstract

This community engagement program was designed to improve vocational students’ conceptual understanding and practical skills in technical measurement through hands-on demonstrations of optical instruments in a school laboratory environment. The activities aimed to bridge the gap between abstract physics concepts and their application in technical practice, particularly in relation to measurement accuracy, instrument handling, and observational skills. An experiential learning approach was implemented, integrating interactive demonstrations, guided practice, and reflective discussion to promote active participation and meaningful learning. Student learning outcomes were assessed through formative evaluation and direct observation of engagement, comprehension, and procedural competence during the sessions. The findings indicate notable improvements in students’ understanding of optical principles, appropriate application of measurement techniques, learning motivation, and confidence in using laboratory equipment, highlighting the value of contextualized laboratory-based learning in vocational education.
THERMAL EFFICIENCY ANALYSIS OF COFFEE BEAN ROASTER BASED ON PARABOLIC DISH COLLECTOR (PDC) WITH THE ADDITION OF FRESNEL GLASS AS A SOLAR RADIATION AMPLIFIER Raihan, Muhammad; Astuti, Edi Tri
TOPLAMA Vol. 3 No. 2 (2026): TOPLAMA
Publisher : PT Altin Riset Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61397/tla.v3i2.500

Abstract

This study discusses the use of solar energy as a heat source in the roasting process of coffee beans using a Parabolic Dish Collector (PDC), and analyzes the effect of Fresnel glass integration on improving the thermal performance of the system. Field test data collection is carried out repeatedly on two system configurations, namely PDC without and with Fresnel glass. The results showed that in the configuration without Fresnel glass, the temperature of the coffee beans only reached about 200 – 210 °C in the 15th minute, because the heating took place indirectly through the walls of the heating tube. Conversely, with the addition of Fresnel glass, the temperature of the coffee beans reaches the roasting threshold (~200 °C) faster, namely in the 9th to 10th minute, and increases to 241 – 249 °C in the 12th minute. This shows an acceleration of heating time of about 5 – 6 minutes at the same relatively same intensity of the sun. In addition, the average thermal efficiency of the system increased from 8.36% to 10.60%, or an increase of about 26.9%. This finding proves that the integration of Fresnel glass in PDC is able to accelerate the heating process, increase the working temperature, and improve heat absorption efficiency, so that this technology has the potential to be applied to small-scale coffee roasting processes based on solar energy.
Co-Authors Ersam Mahendrawan Maulana, Yosef Raihan, Muhammad Solihat, Ihat