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All Journal R.E.M (Rekyasa Energi Manufaktur) Jurnal Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering)
Ahmad Rajani
Badan Riset dan Inovasi Nasional (BRIN)
Agriculture, Biological Sciences & Forestry Engineering

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Investigation of Drying Time and Final Moisture Content of Arabica beans in a Solar Drying Chamber Rendi Ramdhani; Selly Septianissa; Ahmad Rajani
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 6 (2025): December 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtepl.v14i6.2239-2249

Abstract

Drying is a critical stage that affect directly the quality, storability, and market value of Arabica coffee beans. The objective of this study was to investigate the performance of a solar drying chamber integrated with a thermal collector and phase change material (PCM), operated under a constant airflow velocity of 9.2 m/s. Arabica beans of 1500 g were dried over two observation days, with chamber temperatures ranging from 40 °C to 46.5 °C and peak solar radiation of 1122 W/m². The results showed that the system effectively maintained thermal stability and drying performance despite fluctuations in solar input. The analysis revealed at Day 2 achieved a higher and faster moisture reduction due to improved solar conditions and absorber efficiency, with drying rates peaking at over 42 g vapor per hour in the third hour. In contrast, at Day 1 the drying rate peaked in the third hour at approximately 22.45 g vapor/h. Day 1 exhibited a more stable but slower drying trend. Overall, the system successfully reduced the beans’ moisture content to below 12.8% in within under 14 hours, with Tray 2 delivering the most consistent results. These findings demonstrate that the integration of solar thermal energy, PCM, and forced convection application significantly improved drying efficiency and reliability, offering a sustainable alternative for post-harvest processing, especially in regions with variable weather conditions.
Performance Analysis of Waste Heat Recovery-Based Fish Drying System in Block Ice Machine: Analisis Kinerja Sistem Pengering Ikan Berbasis Waste Heat Recovery Pada Mesin Es Balok Agung Firmansyah; Nia Nuraeni Suryaman; Arifin Santosa; Ahmad Rajani
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 11 No 1 (2026): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v11i1.1852

Abstract

Penelitian ini menganalisis performa sistem pengering ikan berbasis pemanfaatan panas buang kondensor mesin es balok melalui metode waste heat recovery tanpa pemanas tambahan eksternal. Metode penelitian menggunakan eksperimen kuantitatif dengan membandingkan sistem pengering berbasis panas kondensor dan pengeringan konvensional menggunakan sinar matahari langsung. Analisis penelitian difokuskan pada karakteristik termal, penurunan kadar air, performa pengeringan, dan konsumsi energi sistem. Sistem pengering berbasis panas kondensor menghasilkan kondisi pengeringan yang lebih stabil dengan temperatur berkisar antara 31,17-40,87°C dan relative humidity menurun dari 100% menjadi 57%. Massa ikan menurun dari 1000 gram menjadi 413 gram yang menunjukkan terjadinya evaporasi air secara kontinu selama proses pengeringan. Sistem menghasilkan nilai rata-rata Specific Energy Consumption (SEC) sebesar 9,40 kWh/kg dan Specific Moisture Extraction Rate (SMER) sebesar 0,10 kg/kWh. Hasil penelitian menunjukkan bahwa panas buang kondensor berpotensi digunakan sebagai sumber energi alternatif pada proses pengeringan ikan yang lebih stabil, terkontrol, dan tidak bergantung secara langsung terhadap kondisi cuaca. Namun, optimasi lebih lanjut terhadap performa kondensor dan kapasitas sistem refrigerasi masih diperlukan untuk meningkatkan performa perpindahan panas dan efisiensi energi sistem pengering.
Co-Authors Agung Firmansyah Arifin Santosa Nia Nuraeni Suryaman Rendi Ramdhani Selly Septianissa