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All Journal International Journal of Energy Systems and Materials Innovation
Roy Sianturi
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Energy Industrial & Manufacturing Engineering Mechanical Engineering

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Energy Analysis of Geothermal Resources in the Volcanic Zone of North Sumatra for Renewable and Reliable Power Supply Roy Sianturi; Hendrik V. Sihombing; Janter Simanjuntak; Farel H. Napitupulu
International Journal of Energy Systems and Materials Innovation Vol. 1 No. 1 (2025): International Journal of Energy Systems and Materials Innovation
Publisher : Gio Vani Publisher

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Geothermal resources represent a vital component in Indonesia’s transition toward sustainable energy, particularly in volcanic regions such as the Sibayak field, North Sumatra. This study aims to evaluate the geothermal potential through integrated reservoir characterization, decline curve analysis, and Life Cycle Assessment (LCA). Field data from three exploration wells were analyzed, including temperature, pressure, enthalpy, and estimated capacity. Decline curve modeling was performed to assess production sustainability under scenarios with and without reinjection. Furthermore, LCA was applied to compare the environmental footprint of geothermal power with coal and natural gas. Results indicate reservoir temperatures ranging from 230–245 °C with enthalpy values exceeding 1,000 kJ/kg, supporting an estimated capacity of 50–55 MWe. Reinjection was shown to reduce annual production decline from ~5% to ~2%, thereby extending reservoir lifetime. LCA outcomes confirmed geothermal energy’s superior environmental performance, with CO₂ emissions as low as 90 g/kWh compared to coal (>1,000 g/kWh) and natural gas (~450 g/kWh). These findings emphasize the strategic role of Sibayak geothermal development in strengthening Indonesia’s clean energy portfolio while ensuring long-term resource sustainability.
Energy-Efficient Design and Performance Evaluation of an Industrial-Scale Coffee Drying System Roy Sianturi; Rogantino Sianturi; Siwan Paranginangin
International Journal of Energy Systems and Materials Innovation Vol. 1 No. 1 (2025): International Journal of Energy Systems and Materials Innovation
Publisher : Gio Vani Publisher

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This study evaluates the performance of a hybrid industrial coffee dryer integrating solar energy, LPG backup, and thermal energy storage (TES) to enhance energy efficiency and sustainability in large-scale coffee processing. Experimental trials were conducted using a 50 kg capacity system equipped with a flat-plate solar collector, LPG burner, and packed-bed TES. Drying kinetics, energy and exergy efficiency, life cycle assessment (LCA), and product quality were analyzed. Results showed that the hybrid dryer reduced specific energy consumption by approximately 65% (0.85 vs. 2.40 kWh/kg), improved exergy efficiency from 21% to 38%, and lowered carbon emissions by nearly 80% (0.75 vs. 2.80 kg CO₂e/kg). Although drying time increased (9 h vs. 6 h for LPG-only), cup quality improved with higher sensory scores and fewer physical defects. These findings highlight the potential of hybrid drying technology to reduce energy use and emissions while ensuring premium coffee quality, supporting sustainable coffee production in line with global carbon-neutral targets.
Co-Authors Farel H. Napitupulu Hendrik V. Sihombing Janter Simanjuntak Rogantino Sianturi Siwan Paranginangin