Storia, Eza Anansa (2016) Pengaruh Obrix Terhadap Karakteristik Perpindahan Panas Pada Evaporator Robert Sistem Quintuple-Effect Di PG. Gempolkrep. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Evaporator Robert merupakan evaporator yang umum digunakan di pabrik gula. Pabrik Gula Gempolkrep mengoperasikan evaporator Robert secara quintuple-effect dengan tekanan yakni 1,6 bar, 1,26 bar, 0,9 bar, 0,54 bar dan 0,18 bar. Tekanan yang rendah membuat titik didih nira semakin menurun sehingga didapatkan nira terkonsentrasi. Konsentrasi nira ditunjukkan dalam obrix.
Dalam penelitian ini, overall heat transfer coefficient dihitung untuk mengetahui karakteristik perpindahan panas. Nilai ini dihitung berdasarkan metode Dessin dan koefisien konveksi perpindahan panas. Konveksi sisi dalam tube dihitung menggunakan Chen’s correlation sedangkan sisi luar tube dihitung menggunakan persamaan konveksi kondensasi film. Hasil yang didapat yaitu obrix semakin besar setiap keluar evaporator yakni 18 obrix, 25 obrix, 32 obrix, 43 obrix dan 68 obrix. Nilai U yang didapat untuk kelima evaporator berdasarkan metode Dessin adalah 3,46 kW/m2.K, 2,92 kW/m2.K, 2,35 kW/m2.K, 1,71 kW/m2.K, dan 0,86 kW/m2.K, sedangkan berdasarkan pendekatan koefisien konveksi didapat U 3,14 kW/m2.K , 2,92 kW/m2.K , 2,48 kW/m2.K , 2,21 kW/m2.K dan 1,57 kW/m2.K secara berurutan.
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Robert evaporator is a commonly-used evaporator in sugar factory. Gempolkrep sugar factory operates Robert evaporator as quintuple-effect with pressure 1,6 bar, 1,26 bar, 0,9 bar, 0,54 bar and 0,18 bar. Low pressure makes boiling point of sugarcane juice decrase thus concentrated juice is obtained. Sugarcane juice concentration expressed as obrix.
In this study, the overall heat transfer coefficient is calculated to determine heat transfer characteristic. This coefficient is calculated based on Dessin method and convective heat transfer coefficient. Convection inside tube is calculated using Chen’s correlation while convection outside tube is calculated using film condensation equation.
The result is obrix exit evaporators are 18 obrix, 25 obrix, 32 obrix, 43 obrix dan 68 obrix. Overall heat transfer coefficient based on Dessin method are 3,46 kW/m2.K, 2,92 kW/m2.K, 2,35 kW/m2.K, 1,71 kW/m2.K, dan 0,86 kW/m2.K, while convective heat transfer coefficient gives U 3,14 kW/m2.K , 2,92 kW/m2.K , 2,48 kW/m2.K , 2,21 kW/m2.K dan 1,57 kW/m2.K respectively.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSM 621.402 2 Sto p |
| Uncontrolled Keywords: | Evaporator, quintuple-effect, obrix, overall heat transfer coefficient. |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ230 Machine design |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Users 13 not found. |
| Date Deposited: | 04 Jul 2017 02:17 |
| Last Modified: | 27 Dec 2018 07:46 |
| URI: | http://repository.its.ac.id/id/eprint/41857 |
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