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All Journal Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Jurnal Ilmiah Inovasi J-Dinamika: Jurnal Pengabdian Kepada Masyarakat Journal of Community Development Journal of Food Engineering Jurnal Teknik Pertanian Terapan
Iswahyono Iswahyono
Politeknik Negeri Jember
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Nursing Public Health Social Sciences Other

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The Optimization of Operating Parameters on the Reduction of Relative Humidity in a Dehumidifier Dryer Using Response Surface Methodology Iswahyono Iswahyono; Yossi Wibisono; Didiek Hermanuadi; Amal Bahariawan; Meta Fitri Rizkiana
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 15 No. 3 (2026): June 2026
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtepl.v15i3.1152-1163

Abstract

Relative humidity (RH) of the drying air is the main driving force in the drying process, as dry air has a greater capacity to absorb water vapor from the material; therefore, the lower the RH, the faster the drying rate. This study aims to determine the optimal RH point under varying airflow rate, evaporator temperature, and heater temperature, and to identify the most suitable RSM model equation. The research was carried out in three stages: (1) development of a dehumidifier dryer; (2) optimization and modeling using the Response Surface Methodology (RSM) with three factors—airflow rate, evaporator temperature, and heater temperature—and one primary response, namely the RH of drying air, along with an additional response of drying air temperature. Design Expert v13 software with the RSM Central Composite Design (CCD) was used to select optimum process conditions from the combination of operating parameters. The accuracy of heater temperature control was analyzed using relative error. The relationship between variables and the RH response of air entering the drying chamber was modeled as: Y = 14.02 + 0.8154A + 0.7625B – 2.75C – 0.4375AB – 0.0875AC – 0.2625BC + 2.48A² + 3.09B² + 9.83C² (where A = airflow rate, B = evaporator temperature, and C = heater temperature). The optimal RH response of the drying air was 20.263% at an airflow rate of 0.018 m³/s, evaporator temperature of 8.413 °C, and heater temperature of 39.49 °C. Air heating temperature control performed very well, with a relative error of 1.22%, which is below 5%.
Uji Mutu Fisikokimia Tepung Daun Marungga Menggunakan Tiga Metode Pengeringan : Physicochemical Quality Testing of Moringa Leaf Flour Using Three Drying Methods Iswahyono Iswahyono; Yossi Wibisono; Didiek Hermanuadi; Amal Bahariawan
Journal of Food Engineering Vol. 5 No. 2 (2026): April
Publisher : Politeknik Negeri Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25047/jofe.v5i2.6871

Abstract

Tanaman marungga disebut sebagai tanaman ajaib, bagian daun  dapat dimanfaatkan sebagai suplemen gizi. Upaya untuk meningkatkan nilai dan diversifikasi olahan turunannya, daun marungga diolah menjadi produk kering berupa tepung. Tepung daun marungga diperoleh dengan cara pengeringan. Metode pengeringan yang tepat diperlukan agar tidak mempengaruhi mutu fisik dan kimia. Oleh karena itu, tujuan penelitian ini adalah untuk mengetahui pengaruh tiga metode pengeringan terhadap sifat fisik dan kimia tepung daun marungga. Metode pengeringan yang digunakan yaitu diangin-anginkan, pengeringan sinar matahari dan pengering dehumidifier. Hasil penelitian menunjukkan bahwa pengeringan daun marungga terbaik menggunakan pengering dehumidifier dengan densitas (0,35 g/ml), kadar air (6,50 %), aktifitas antioksidan (59,68 %) dan kadar protein (27,83 %). Pengeringaan dengan cara diangin-anginkan memberikan hasil terbaik pada warna yaitu sebesar -14.25 (cenderung hijau).
Co-Authors Adi Chandra Nugraha Amal Bahariawan Ancah Caesarina Novi Marchianti An’illa Agrissa Nurringge Bambang Piluharto Deltaningtyas Tri Cahyaningrum Didiek Hermanuadi Didiek Hermanuadi Didik Hermanuadi Djamali, Abdoel Elly Kurniawati Elok Kurnia Novita Sari Faizzatun Nafisah Habib Ihza Mahendra Meta Fitri Rizkiana Muhammad Luthfi Dinsaputro Naning Retnowati Nurud Diniyah Ririn Novitasari Riska Rian Fauziah Siti Djamila Siti Djamila Yossi Wibisono