Studi Numerik Pengaruh Modifikasi Segmental Baffle Menjadi Trapezoidal Baffle Terhadap Performa Shell and Tube Heat Exchanger

Muzhoffar, Muhammad Hilmi (2024) Studi Numerik Pengaruh Modifikasi Segmental Baffle Menjadi Trapezoidal Baffle Terhadap Performa Shell and Tube Heat Exchanger. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Performa kerja Shell and Tube Heat Exchanger (STHE) sangat penting dalam mendukung capaian produksi dan efisiensi energi. STHE dengan segmental baffle (konvensional) merupakan konfigurasi yang banyak digunakan di industri, namun memiliki kelemahan seperti kurangnya performa perpindahan panas, tingginya pressure drop pada sisi shell zone, dan memilik aliran berliku (tranverse flow) pada belakang baffle sehingga menghasilkan zona mati yang menyebabkan menurunnya tingkat perpindahan panas. Hal ini, dapat ditingkatkan dengan mengubah baffle menjadi bentuk trapezoidal baffle. Trapezoidal dibentuk menggunakan lempengan elips yang dipotong dan disusun secara oblique dengan sudut inklinasi 45° menciptakan aliran berputar (twist flow) yang dapat meningkatkan performa heat exchanger dan mengurangi pressure drop aliran. Modifikasi STHE segmental baffle menjadi trapezoidal baffle dianalisa dengan metode simulasi Computational Fluid Dynamics (CFD) sehingga di dapatkan fleksibilitas dalam penentuan variasi dan visualisasi yang lebih baik tentang aliran fluida dan distribusi suhu dalam STHE. Studi ini menggunakan STHE dengan rancang mengacu pada jurnal sebagai baseline simulasi sehingga analisa dapat mengimplementasikan berbagai tipe STHE dan jenis fluida yang berbeda, seperti water, feed gas, dan asam sulfat yang digunakan dalam proses produksi Pertamina EP Cepu yang telah dikondisikan. Hasil simulasi CFD menunjukkan bahwa trapezoidal baffle dengan sudut inklinasi 45° menghasilkan peningkatan performa pada tiap variasi mass flow. Untuk fluida water, feed gas, dan asam sulfat secara berurutan yaitu didapat peningkatan nilai overall heat transfer coefficient (U) sebesar 784 – 1169 watt/m².°K, 36 – 50 watt/m².°K, dan 262 – 721 watt/m².°K. Efektivitas meningkat 38 – 59% dan pressure drop pada shell zone menurun 30 – 55% dibandingkan dengan STHE segmental baffle, Hasil penelitian ini memberikan skema baru bentuk trapezoidal baffle dan hasil performa yang tinggi dapat diadopsi perusahaan atau industri untuk meningkatkan performa operasional dan efisiensi energi.

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Performance of Shell and Tube Heat Exchangers (STHE) is crucial for supporting production targets and energy efficiency. STHE with segmental baffles (conventional) are widely used in the industry, but they have drawbacks such as reduced heat transfer performance, high pressure drop in the shell zone, and transverse flow behind the baffles that creates dead zones, resulting in decreased heat transfer efficiency. These issues can be mitigated by modifying the baffles into a trapezoidal shape. The trapezoidal baffles are formed using elliptical plates cut and arranged obliquely at a 45° inclination angle, creating a twist flow that enhances heat exchanger performance and reduces flow pressure drop. The modification of STHE segmental baffles into trapezoidal baffles was analyzed using Computational Fluid Dynamics (CFD) simulation methods, offering flexibility in varying conditions and better visualization of fluid flow and temperature distribution within the STHE. This study utilized STHE designs based on journal references as the baseline for simulations, enabling the analysis of different STHE types and various fluids such as water, feed gas, and sulfuric acid used in Pertamina EP Cepu’s production process. CFD simulation results indicate that trapezoidal baffles with a 45° inclination angle improve performance across different mass flow rates. For water, feed gas, and sulfuric acid, the overall heat transfer coefficient (U) increased by 784 – 1169 W/m².°K, 36 – 50 W/m².°K, and 262 – 721 W/m².°K, respectively. Effectiveness increased by 38 – 59%, and the pressure drop in the shell zone decreased by 30 – 55% compared to STHEs with segmental baffles. This study presents a new trapezoidal baffle design and demonstrates its high performance, which can be adopted by companies or industries to enhance operational performance and energy efficiency.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Peforma Shell & Tube Heat exchanger, Shell and Tube Heat Exchanger, Trapezoidal Baffle, Computational Fluid Dynamic, CFD, Overall Heat Transfer Coefficient, Effectiveness, Modifikasi Baffle.
Subjects:	T Technology > T Technology (General) > T57.62 Simulation T Technology > TJ Mechanical engineering and machinery > TJ263 Heat exchangers T Technology > TS Manufactures > TS176 Manufacturing engineering. Process engineering (Including manufacturing planning, production planning)
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Muhammad Hilmi Muzhoffar
Date Deposited:	02 Aug 2024 07:56
Last Modified:	02 Aug 2024 07:56
URI:	http://repository.its.ac.id/id/eprint/111525

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