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Abstrak (Bhs. Indonesia)

Kopi Robusta (Coffea canephora) merupakan varietas penting dalam industri 
kopi global, dikenal dengan rasa kuat, kadar kafein tinggi (2,2–2,7%), serta 
ketahanan terhadap hama dan produktivitas yang tinggi. Hal ini menjadikannya 
banyak dibudidayakan di wilayah tropis, termasuk Indonesia. Penelitian ini 
bertujuan mengevaluasi kinerja alat pengering tipe rak berputar dalam proses 
pengeringan kopi Robusta. Penelitian dilakukan pada Mei–Juli 2023 di 
Laboratorium TSTET, Fakultas Pertanian, Universitas Jenderal Soedirman. Tiga 
perlakuan waktu pengeringan (P1, P2, P3) diuji dengan parameter kadar air, suhu, 
kelembaban, lama dan laju pengeringan, serta efisiensi energi. Hasil menunjukkan 
efisiensi pengeringan tertinggi sebesar 6,9% dicapai pada perlakuan P2 (6 jam), 
dengan penurunan kadar air dari 31% menjadi 11,5% — kadar air akhir paling 
optimal. Pengeringan terlama (P3 – 7 jam) justru memiliki efisiensi terendah 
(5,7%). Temuan ini menunjukkan bahwa alat pengering rak berputar cukup efektif 
dalam mempercepat proses pengeringan dan mencapai kualitas mutu kopi yang 
diinginkan.

Abtrak (Bhs. Inggris)

Robusta coffee (Coffea canephora) is a significant variety in the global coffee 
industry, known for its strong flavor, high caffeine content (2.2–2.7%), resistance 
to pests, and high productivity. These characteristics make it widely cultivated in 
tropical regions, including Indonesia. This study aims to evaluate the performance 
of a rotary rack-type dryer in drying Robusta coffee beans. The research was 
conducted from May to July 2023 at the TSTET Laboratory, Faculty of Agriculture, 
Jenderal Soedirman University. Three drying treatments (P1, P2, P3) were tested, 
observing parameters such as moisture content, drying temperature, humidity, 
drying duration, drying rate, and energy and drying efficiency. The results showed 
that the highest drying efficiency (6.9%) was achieved in treatment P2 (6 hours), 
with moisture content reduced from 31% to 11.5%—the most optimal final moisture 
level. The longest drying treatment (P3 – 7 hours) resulted in the lowest efficiency 
(5.7%). These findings indicate that the rotary rack-type dryer is effective in 
accelerating the drying process while achieving the desired coffee quality.

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