ANALISIS PERPINDAHAN PANAS PADA PROSES PENGOLAHAN LARUTAN KUNYIT MENGGUNAKAN KRISTALISATOR BERJAKET AIR PANAS DAN UJI KUALITAS PRODUK

MCXAVER, Devi Yuni Susanti, STP. M.Sc.

2013 | Skripsi | TEKNIK PERTANIAN

Kunyit instan merupakan produk minuman instan berbentuk kristal dengan bahan dasar gula pasir dan larutan kunyit sebagai bahan tambahan senyawa fungsional. Proses perpindahan panas selama pengolahan larutan kunyit instan serta kualitas produk yang dihasilkan merupakan informasi penting untuk mengetahui keberhasilan proses pengolahan. Penelitian bertujuan untuk menganalisis perpindahan panas selama pengolahan larutan kunyit instan dengan kristalisator berjaket air panas serta kualitas produk yang dihasilkan. Analisis perpindahan panas yang dilakukan meliputi penentuan nilai koefisien perpindahan panas konveksi selama proses pemanasan air dalam ketel, evaporasi, dan kristalisasi larutan kunyit. Kristalisasor ini menggunakan air panas yang dialirkan dari ketel ke dalam jaket sebagai media pemanas larutan. Variasi konsentrasi larutan yang dipakai ialah 83,33%, 77,07%, dan 66,67%. Hasil penelitian menunjukkan bahwa nilai koefisien perpindahan panas konveksi selama proses pemanasan air yaitu ha1 berkisar antara 183,75 W/m2.oC - 243,20 W/m2.oC dan ha2 berkisar antara 45,94 W/m2.oC - 136,19 W/m2.oC, with berkisar 18,31% - 25,55% dan nilai koefisien perpindahan panas konveksi selama proses evaporasi dan kristalisasi yaitu he1 berkisar antara 13,60 W/m2.oC - 302,57 W/m2.oC, he2 berkisar antara 7,57W/m2.oC - 52,83 W/m2.oC, dan hk berkisar antara 36,15 W/m2.oC - 116,37 W/m2.oC dengan efisiensi transfer panas 2,94% - 9,36%. Ukuran partikel kunyit instan yang diperoleh berkisar antara 0,31 mm - 0,69 mm.

Instant Turmeric is instant beverage crystal form products with sugar as basic ingredients and turmeric solution as an additive functional compounds. The process of heat transfer during processing of instant turmeric solution and product quality is important information to recognize the success of the treatment process. The research aims to analyze the heat transfer during the processing of turmeric solution with hot water jacketed crystallizer machine as well as the quality of the resulting product. Heat transfer analysis was conducted on the determination of convection heat transfer coefficient value during the process of heating water in the boiler, evaporation, and crystallization of instant turmeric solution. This crystallizer using hot water that flowed from the kettle into the jacket as a heating medium of solution. Variations in solution concentration used were 83.33%, 77.07%, and 66.67%. The results showed that the convection heat transfer coefficient for the water heating process ha1ranged between 183,75 W/m2.oC - 243,20 W/m2. oC and ha2ranged between 45,94 W/m2.oC - 136,19 W/m2.oC, with efficiency of heating water as a heat source in the evaporation process of 18.31% - 25.55% and the value of the convection heat transfer coefficient for the evaporation, and crystallization process he1 ranged between 13,60 W/m2.oC - 302,57 W/m2.oC, he2 ranged between 7,57 W/m2.oC -52,83W/m2.oC, and hk ranged between 36,15 W/m2.oC - 116,37 W/m2.oC, with heat transfer efficiency of 2.94% - 9.36%. Instant turmeric particle sizes obtained ranged from 0.31 mm - 0.69 mm.

Kata Kunci : Kunyit Instan, Kristalisator, Konveksi.