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All Journal Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Kubis
Mawardi, Haris
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Agriculture, Biological Sciences & Forestry Humanities Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Engineering

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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.
Design and Performance Test of Brown Rice Germinator with Automatic Environmental Control System for Production of Germinated Brown Rice Permatasari, Ressy Angli; Sutrisno, Sutrisno; Budiastra, I Wayan; Mawardi, Haris; Firmansyah, Angga; Hermawan, Arfandi; Ningsih, Elisa Eka Ari Purwanti
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 1 (2025): February 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v14i1.171-181

Abstract

A germinator equipped with automatic environmental control system has been developed to produce the high quality of germinated brown rice. The germinator consists of germination chamber, temperature and relative humidity sensors, relays, actuator, and display panel so the germination process can be set up and controlled. The performance test were carried out covering the technical reliability of the system and the capability of germinator to produce germinated brown rice. The test results show that the brown rice germinator with an automatic environmental control system worked very well. The use of water misters and PTC air heaters is able to maintain humidity and air temperature inside germinator. The brown rice germinator can produce germinated brown rice with germination rate more than 80%. The result shows that the brown rice germinator can be used to produce germinated brown rice both for private and commercial use. Keywords: Brown rice, Germination, Humidity, Temperature.
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 Firmansyah, Angga Hermawan, Arfandi I Wayan Budiastra Muhamad Yulianto Ningsih, Elisa Eka Ari Purwanti Permatasari, Ressy Angli Rina Puji Lestari, Rina Puji Sahbudin, Muhammad Sutrisno, Sutrisno