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All Journal R.E.M (Rekyasa Energi Manufaktur) Jurnal Logic : Jurnal Rancang Bangun Dan Teknologi
Ahmad Rajani
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Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Experimental Study on Solar Drying of Arabica Coffee Beans: Achieving Standard Moisture Content Using a Drying Chamber Collector Hilman Mafazi; Selly Septianissa; Ahmad Rajani
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 2 (2025): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i2.107-116

Abstract

Drying technology plays a critical role in preserving and enhancing the quality of agricultural products, particularly in the post-harvest handling of Arabica coffee. In this experimental study, Arabica coffee beans were dried using a solar drying chamber equipped with a collector system to achieve standard moisture content. A total of 6000 grams of coffee beans were dried over 28 hours, with the system operating under an average chamber temperature of 40°C and a peak solar radiation intensity of 1122 W/m² occurring at 12:00 PM. The drying process utilized an air velocity of 9.2 m/s to enhance heat and mass transfer within the chamber. Among all trays tested, tray 2 produced the best quality beans with a final moisture content of 11.8%, aligning with the recommended standard for green coffee storage. These results demonstrate that integrating high air velocity and optimized collector design in a solar drying chamber can significantly reduce moisture content while maintaining bean quality, thereby offering an effective and sustainable alternative to conventional drying methods.
Experimental Study of Bifacial Solar Panels with Reflective Surface Variations in Bandung, Indonesia Barokah, Rofi; Nia Nuraeni Suryaman; Ahmad Rajani
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 2 (2025): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v10i2.1758

Abstract

This study aims to evaluate the performance of bifacial photovoltaic (PV) panels under different reflective surface conditions in a tropical urban environment, specifically in Bandung, Indonesia. Bifacial PV systems offer the advantage of capturing solar radiation from both the front and rear sides, with performance significantly influenced by the surface beneath the panels. The experiment involved three surface types: asphalt, untreated paving blocks, and paving blocks coated with white paint. Each panel was installed at a fixed 8° tilt facing north, and data were collected from 09:00 to 15:00 local time. The results indicate that the white-painted surface produced the highest power output, reaching up to 410 Watts, followed by paving blocks at 390 Watts and asphalt at 370 Watts. Although all surfaces received a similar radiation pattern, their differing reflectivity affected the amount of radiation reaching the rear side of the bifacial panels. The white-painted surface, characterized by high reflectance, not only enhanced rear-side radiation capture but also maintained a more stable power output after peak solar hours. These findings highlight the critical role of surface reflectivity in optimizing bifacial PV performance and support the strategic use of surface materials in PV system deployment, particularly in tropical climates. This study contributes valuable empirical data to the growing field of bifacial PV applications and offers practical insights for improving energy yield in real-world tropical settings.
Co-Authors Barokah, Rofi Hilman Mafazi Nia Nuraeni Suryaman Selly Septianissa