Pengeringan Lapis Tipis Biji Jagung dengan Alat Pengering Sistem Fluidasi
Abstract
Abstract
The objective of this study are to analyze the drying characteristics of corn, and then determine the thin layer drying models which represents the characteristics of thin layer drying of corn seed. This experiment were conducted using a laboratory scale fluidized bed dryer. The drying condition was controlled at four-level temperatures of 40 °C, 50 °C, 60 °C and 70 °C and at air velocity of 2.2 m /s. Characteristics of corn drying in this study indicate that only occurs the drying rate decreased which decreased continuously with decreasing moisture content to near equilibrium moisture content (drying after 2 hours). Two thin layer drying models, namely Henderson-Pabis Model and Page Model were fitted to the experimental data. The results show that the Page model is a best fits model which represents the driying characteristics of thin layer drying of corn seed.
Keywords : Drying; Corn seed; Thin Layer Drying
Abstrak
Penelitian ini bertujuan untuk mengetahui karakteristik pengeringan jagung, dan menentukan model pengeringan lapisan tipis yang sesuai dengan karakteristik pengeringan lapisan tipis biji jagung. Penelitian berlangsung dengan mengeringkan biji jagung dalam alat pengering sistem fluidasi untuk empat level suhu pengeringan yang berbeda yaitu 40 °C, 50 °C, 60 °C dan 70 °C pada kecepatan 2,2 m/s. Hasil penelitian menunjukkan bahwa hanya terjadi laju pengeringan menurun yang diawali dengan pengeringan menurun tajam dan kemudian menurun secara perlahan sampai mendekati kadar air keseimbangan (pengeringan setelah 2 jam). Pola ini semakin terlihat jelas pada suhu pengeringan di atas 50 °C. Dua model pengeringan lapisan tipis yaitu Model Henderson-Pabis dan Model Page diuji dengan mengkorelasikan model yang sesuai dengan data hasil ekperimen. Hasilnya menunjukkan bahwa Model Page merupakan model yang paling sesuai dengan karakteristik pengeringan lapisan tipis biji jagung.
Kata Kunci : Pengeringan, Biji jagung, Lapisan Tipis
Diterima: 11 November 2010; Disetujui: 21 Maret 2011
Authors
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