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All Journal Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Kubis
Mawardi, Haris
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Agriculture, Biological Sciences & Forestry Humanities Decision Sciences, Operations Research & Management Economics, Econometrics & Finance

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Studi Teoritis Karakteristik Termal Pembakaran Biomassa Tanaman Energi pada Berbagai Kondisi Udara dalam Tungku Adiabatik Mawardi, Haris; Hartulistiyoso, Edy; Yulianto, Muhamad
Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 12 No 2 (2024): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem
Publisher : Fakultas Teknologi Pangan & Agroindustri (Fatepa) Universitas Mataram dan Perhimpunan Teknik Pertanian (PERTETA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jrpb.v12i2.659

Abstract

Combustion is an energy conversion method involving the reaction of fuel and oxygen to generate heat. Coal remains predominant in Indonesia’s energy mix, contributing to over 50% of global CO2 emissions. Efforts to reduce these emissions include using renewable energy sources like biomass, with current potential in energy crop biomass such as gamal and sengon wood. However, the thermal characteristics of burning gamal and sengon wood have not been extensively studied. This paper discusses the theoretical thermal characteristics of gamal and sengon wood combustion through numerical simulation using a combustion equilibrium model in an adiabatic furnace under stoichiometric, excess air, and excess fuel conditions. Thermodynamic calculations will be validated against experimental data. The simulation results show that the thermal characteristics of gamal combustion are superior to those of sengon. Adjustments in air supply can impact combustion quality, where excess air is often necessary to mitigate environmental factors disrupting theoretical stoichiometric combustion. Optimal combustion conditions are achieved at equivalence ratios of 1.3 for gamal and sengon. Validation using Mean Absolute Percentage Error (MAPE) indicates low error values (8,55%) affirming the model’s ability to predict thermal characteristics accurately.
Analisis Kelayakan Pembuatan Instalasi Biogas Sebagai Energi Alternatif di Ranjok Lombok Barat Mawardi, Haris; Sahbudin, Muhammad; Lestari, Rina Puji
KUBIS Vol 5 No 02 (2025): November
Publisher : Program Studi Agribisnis

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56013/kub.v5i02.4930

Abstract

Kebutuhan energi yang terus meningkat, terutama di pedesaan, mendorong pemanfaatan sumber energi terbarukan yang ramah lingkungan seperti biogas, yang dihasilkan dari kotoran hewan ternak. Penelitian ini bertujuan mengkaji kelayakan finansial instalasi biogas skala kelompok peternak, meliputi investasi, biaya operasional, dan manfaat ekonomi. Hasil analisis finansial menunjukkan bahwa meskipun investasi awal proyek sebesar Rp 27.165.000,00, proyek ini terbukti sangat menguntungkan. Nilai Net Present Value (NPV) positif sebesar Rp 19.635.000,00 dan Waktu Pengembalian Investasi (Payback Period) yang cepat pada Tahun ke-3 mengindikasikan kelayakan investasi yang kuat. Kelayakan ini diperkuat oleh nilai Net B/C Ratio sebesar 1,09 dan Internal Rate of Return (IRR) yang sangat tinggi, yaitu 21%. Nilai IRR ini jauh melampaui tingkat diskonto yang digunakan, menunjukkan tingkat profitabilitas yang unggul. Selain kelayakan finansial, biogas juga memberikan dampak positif lingkungan, yaitu berpotensi mengurangi emisi gas rumah kaca dan mendukung pengelolaan limbah organik secara efisien. Proyek instalasi biogas ini direkomendasikan karena menawarkan manfaat ekonomi yang kuat dan kontribusi signifikan terhadap keberlanjutan lingkungan.
Co-Authors Edy Hartulistiyoso Muhamad Yulianto Rina Puji Lestari, Rina Puji Sahbudin, Muhammad