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RANCANG BANGUN DAN UJICOBA PENGERING SURYA TIPE KOLEKTOR TABUNG VAKUM (EVACUATED TUBE COLLECTOR) Sari Farah Dina; Siti Masriani Rambe; Azwardi Azwardi; Edwin Harianto Sipahutar
Jurnal Dinamika Penelitian Industri Vol 29, No 1 (2018): JURNAL DINAMIKA PENELITIAN INDUSTRI
Publisher : Balai Riset dan Standardisasi Industri Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1274.233 KB) | DOI: 10.28959/jdpi.v29i1.3919

Abstract

Research of design of solar dryer with evacuated tube collector for drying coffee bean has been done. This research is done through the stage of formulation, design, circuit and testing tools using coffee as material to be dried.Test results of a solar dryer designed then is being used for drying coffee bean (moisture content  from 52.80% to 12.30%), with forced convection system which the air speed are varied of 2-6 m/sec. During the drying process, the average weather conditions are in the range 143-855 Watt / m2, ambient temperature of 28-36 °C. The air temperature in the collector are 85-192 °C and the temperature in the drying chamber are 35-78 °C. The results showed that air drying velocity is directly proportional to the drying rate and collector efficiency but inversely to drying time and specific energy consumption (SEC).
Rancangan dan Uji Performansi Alat Pengering Tenaga Surya Menggunakan Pompa Kalor (Hibrida) untuk Pengeringan Biji Kakao Sari Farah Dina; Harry P. Limbong; Siti Masriani Rambe
Jurnal Riset Teknologi Industri Vol. 12 No.1 Juni 2018
Publisher : Balai Riset dan Standardisasi Industri Samarinda

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (762.853 KB) | DOI: 10.26578/jrti.v12i1.3794

Abstract

Penelitian ini bertujuan untuk mengetahui performansi pengeringan biji kakao fermentasi dengan mengkondisikan udara pengering sehingga memiliki kelembaban yang lebih rendah dan suhu yang lebih tinggi daripada lingkungan. Penelitian ini menggunakan pompa kalor, kolektor surya, evaporator dan kondensor. Pengeringan berlangsung di posisi 3,36°LU - 98.4°BT, pada ketinggian 200 meter di atas permukaan laut dan waktu meridian (GMT + 7), selama tiga (3) hari dengan tiga kali pengulangan. Selama pengeringan, intensitas radiasi berada pada kisaran 20-803 Watt/m2 dan suhu ruang pengering dalam kisaran 32-48°C dan 35-80%RH. Hasil percobaan menunjukkan bahwa efisiensi termal rata-rata solar kolektor adalah 40-51%. Koefisien kinerja (COP) dan total kinerja pompa kalor, berturut-turut adalah 3,9 dan 9,3. Laju pengeringan, laju penguapan air spesifik dan konsumsi energi spesifik berturut-turut adalah 0,0481 kg/jam, 0,294 kg/kWh dan 6,12 MJ/kg. Pengeringan surya dibantu pompa kalor memberikan waktu pengeringan lebih pendek (rata-rata 24 jam) daripada penjemuran langsung (rata-rata 40 jam atau 5 hari).Kata kunci: pengeringan, tenaga surya, pompa kalor, performansi, mutu biji kakao ABSTRACTThis research aims to find out the performance of drying of fermented cocoa beans by conditioning the dryer air so that it has lower humidity and higher temperature than the ambient condition. This research uses heat pump, solar collector, evaporator and condenser. Drying takes  at position 3.36 oLU - 98.4 oBT, at an altitude of 200 meters above sea level and meridian time (GMT + 7), for three (3) days with three repetitions. During drying, the radiation intensity is in the range of 20-803 Watts / m2 and the drying room temperature in the range of 32-48 oC and 35-80% RH. The experimental results show that the average thermal efficiency of collector solar is 40-51%. The performance coefficients (COP) and total heat pump performance, respectively, are 3.9 and 9.3. Drying rate, specific water evaporation rate and specific energy consumption are 0.0481 kg / hour, 0.294 kg / kWh and 6.12 MJ / kg, respectively. The solar drying assisted heat pump gives shorter drying time (24 hours on average) than direct drying (average 40 hours or 5 days).