Studi Numerik Perpindahan Panas Pada Corrugated Plate Heat Exchanger Chevron Type Dengan Variasi Corrugation Angle Pada Aliran Turbulen Dengan Software ANSYS FLUENT 18.1

Sutandyo, Shania Amna (2021) Studi Numerik Perpindahan Panas Pada Corrugated Plate Heat Exchanger Chevron Type Dengan Variasi Corrugation Angle Pada Aliran Turbulen Dengan Software ANSYS FLUENT 18.1. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sistem oil cooler selama proses kerja turbin sangat penting. Oil cooler ini menggunakan heat exchanger atau alat penukar panas. Salah satu tipe heat exchanger yang memiliki performa tinggi yaitu plate heat exchanger (PHE) tipe chevron. Performa PHE dalam pendinginan oli sangat mempengaruhi performa dari sistem pelumasan yang akan berdampak pula pada performa turbin gas. Salah satu hal yang mempengaruhi performa PHE yaitu dalam aspek desain. Dalam penelitian ini akan digunakan flat dan corrugated PHE tipe chevron dengan memvariasikan bagian corrugation angle pada aliran turbulen.
Tugas akhir ini menggunakan software GAMBIT 2.4.6 untuk pemodelan geometri dan meshing, serta software ANSYS FLUENT 18.1 untuk melakukan proses simulasi perpindahan panas fluida di antara dua pelat channel fluida dingin pada PHE. PHE untuk simulasi diambil hanya pada seperempat bagian dari ukuran asli dengan ukuran L = 0,2 m dan w = 0,11 m. Pemanasan pada fluida dingin dilakukan dengan kondisi inlet fluida pada suhu 293K dan m ̇=0,078 kg/s serta menjaga temperatur pada kedua pelat atas dan bawah konstan pada temperatur 333K. Dilakukan empat variasi sudut korugasi pada PHE yaitu flat plate (tanpa korugasi), 25º, 45º, dan 65º.° Untuk mendapatkan hasil yang baik, dilakukan grid independency test sehingga diperoleh jumlah nodes pada meshing yang optimal, sehingga dapat mengurangi adanya kesalahan hasil simulasi yang disebabkan oleh meshing.
Dari simulasi yang dilakukan, didapatkan hasil bahwa penggunaan corrugated PHE jauh lebih baik daripada penggunaan flat PHE. Kemudian dalam variasi sudut korugasi terlihat bahwasanya semakin besar sudut korugasi yang digunakan maka perpindahan panas yang terjadi semakin cepat serta penurunan tekanan yang semakin besar. Ditinjau dari perbandingan perpindahan panas dan penurunan tekanan antara flat dan corrugated PHE didapatkan hasil bahwasanya nilai thermal enhancement factor pada corrugated PHE paling tinggi pada sudut 65º yaitu sebesar 1,94 dan paling rendah pada sudut 25º yaitu sebesar 1,83.
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The oil cooler system during the turbine working process is very important. This oil cooler uses a heat exchanger. One type of heat exchanger that has high performance is the chevron type plate heat exchanger (PHE). The performance of PHE in oil cooling greatly affects the performance of the lubrication system which will also have an impact on the performance of the gas turbine. One of the things that affect the performance of PHE is in the design aspect. In this research, flat and corrugated chevron type PHE will be used by varying the corrugation angle in turbulent flow.
This final project uses GAMBIT 2.4.6 software for geometry and meshing modeling, and ANSYS FLUENT 18.1 software to perform the fluid heat transfer process between two plates of cold fluid channel at PHE. The PHE for the simulation was taken only at a quarter of the original size with sizes L = 0.2 m and w = 0.11 m. Heating process in cold fluid is carried out with the fluid inlet condition at a temperature of 293K and m ̇ = 0.078 kg/s and keeping the temperature on both the top and bottom plates constant at 333K. Four variations of the corrugation angle can be performed on the PHE, namely flat plates (without corrugation), 25º, 45, and 65º. To get good results, a grid independency test is carried out so that the optimal number of nodes in meshing is obtained, so as to reduce simulation results errors caused by meshing.
From the simulations result, it was found that the use of corrugated PHE was much better than the use of flat PHE. Then in the variation of the corrugation angle, it can be seen that the greater the corrugation angle used, the faster the heat transfer and the greater the pressure drop. Judging from the comparison of heat transfer and pressure drop between flat and corrugated PHE, the results show that the highest thermal enhancement factor for corrugated PHE is at an angle of 65º, which is 1.94 and the lowest is at an angle of 25º, which is 1.83.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	CFD, Corrugated, Plate Heat Exchanger, Chevron, Turbulen
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA357 Computational fluid dynamics. Fluid Mechanics T Technology > TJ Mechanical engineering and machinery > TJ263 Heat exchangers
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Shania Amna Sutandyo
Date Deposited:	14 Aug 2021 04:23
Last Modified:	14 Aug 2021 04:23
URI:	http://repository.its.ac.id/id/eprint/86633

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