Studi Numerik Pengaruh Baffle Spacing Jenis Double Segmental Terhadap Aliran Fluida Dan Perpindahan Panas Pada Shell And Tube Heat Exchanger

Indrastoto, Dimas Naryama (2023) Studi Numerik Pengaruh Baffle Spacing Jenis Double Segmental Terhadap Aliran Fluida Dan Perpindahan Panas Pada Shell And Tube Heat Exchanger. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Heat exchanger di PLTA memiliki masalah pada kualitas air sungai sebagai fluida pendingin yang terpengaruh terhadap kondisi lingkungan sehingga dapat menyebabkan foulling. Salah satu cara mengatasi dengan menggunakan model double segmental baffle karena lebih banyak turbulensi yang dapat mengurangi laju rekristalisasi atau deposit fouling. Akan tetapi, standar TEMA tidak mengatur secara spesifik untuk aturan baffle spacing pada model tersebut sehingga harus dicari konfigurasi yang optimal. Dilakukanlah penelitian ini untuk mengetahui pengaruh baffle spacing terhadap aliran fluida, perpindahan panas, dan pressure drop STHX dengan jenis double segmental baffle. Penelitian studi numerik CFD menggunakan ANSY Fluent dengan memvariasikan jarak baffle 55 mm, 45 mm, dan 35 mm dengan mass flow rate fluida shell divariasikan 0.5 kg/s, 1 kg/s, dan 2 kg/s sedangkan mass flow rate fluida tube konstan 0.85 kg/s. Hasil simulasi CFD menghasilkan terdapat pengaruh pada turbulensi dan kecepatan pada baffle. Semakin kecil baffle spacing akan menyebabkan vortex yang terbentuk menjadi kecil dan streamline mengecil sehingga terdapat peningkatan kecepatan aliran.pada cross flow split baffle dan central baffle. Terjadi peningkatan kecepatan aliran rata-rata sebesar 0.9% pada spacing 45 mm dan 2.5% pada spacing 35 mm terhadap spacing 55 mm. Pengecilan baffle spacing berpengaruh pada perpindahan panas dengan meningkatnya heat transfer coefficient, Pada variasi mass flow rate, h lokal rata-rata overall mengalami peningkatan rata-rata sebesar 6.26% pada spacing 45 mm dan 12.367% pada spacing 35 mm terhadap spacing 55 mm. Nilai heat transfer coefficient dipengaruhi oleh vortex, streamline, dan kecepatan fluida. Pengecilan baffle spacing berpengaruh pada peningkatan pressure drop. Pada pressure drop lokal, variasi mass flow rate mengalami peningkatan rata-rata sebesar 3.1% pada spacing 45 mm dan 9% pada spacing 35 mm terhadap spacing 55 mm. Pada pressure drop overall, mengalami peningkatan rata-rata pada 45 mm sebesar 21.43% dan 47.07% pada 35 mm terhadap baffle spacing 55 mm.
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The heat exchanger in the hydroelectric power plant has a problem with the quality of river water as a coolant fluid that is affected by environmental conditions that causing fouling. One way to overcome this is by using a double segmental baffle model because it creates more turbulence that can reduce the rate of recrystallization or fouling deposits. However, TEMA standards do not specifically regulate the rules for baffle spacing on this model, so an optimal configuration must be sought. This research was conducted to determine the effect of baffle spacing on fluid flow, heat transfer, and pressure drop in STHX with a double segmental baffle type. Numerical CFD study research was carried out using ANSYS Fluent by varying the baffle distance 55 mm, 45 mm, and 35 mm with the mass flow rate of the shell fluid varied 0.5 kg/s, 1 kg/s, and 2 kg/s while the mass flow rate of the tube fluid was constant at 0.85 kg/s. The results of the CFD simulation indicate that there is an effect on turbulence and speed at the baffle. The smaller the baffle spacing, the smaller the formed vortex and streamline, so there is an increase in flow speed on the cross-flow split baffle and central baffle. There is an increase in the average flow speed of 0.9% at 45 mm spacing and 2.5% at 35 mm spacing compared to 55 mm spacing. The reduction in baffle spacing affects heat transfer by increasing the heat transfer coefficient. In variations of mass flow rate, the average overall local h increased on average by 6.26% at 45 mm spacing and 12.367% at 35 mm spacing compared to 55 mm spacing. The heat transfer coefficient value is influenced by the vortex, streamline, and fluid speed. The reduction in baffle spacing affects the increase in pressure drop. For local pressure drop, the variation of the mass flow rate increased on average by 3.1% at 45 mm spacing and 9% at 35 mm spacing compared to 55 mm spacing. The overall pressure drop experiences an average increase of 21.43% at 45 mm and 47.07% at 35 mm compared to a baffle spacing of 55 mm.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	double segmental baffle, baffle spacing, CFD
Subjects:	Q Science > QC Physics > QC320 Heat transfer
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Dimas Naryama Indrastoto
Date Deposited:	13 Oct 2023 08:37
Last Modified:	13 Oct 2023 08:37
URI:	http://repository.its.ac.id/id/eprint/102588

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