Analisis Numerik Transien Pengaruh Rotational Velocity Dan Flue Gas Velocity Inlet Terhadap Perpindahan Panas Transien Plate Heating Element Pada Rotary Air Preheater

Novrian, Muhammad Kevin (2022) Analisis Numerik Transien Pengaruh Rotational Velocity Dan Flue Gas Velocity Inlet Terhadap Perpindahan Panas Transien Plate Heating Element Pada Rotary Air Preheater. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Aspek penting dari suatu industri energi ialah efisiensi operasional industri tersebut. Pada industri pembangkit listrik tenaga uap (PLTU), suatu alat digunakan untuk meningkatkan efisiensinya yaitu, Rotary Air Preheater (RAPH), dimana pemanas awal diberikan untuk primary air menggunakan panas dari flue gas yang akan dibuang. Panas dari aliran flue gas disimpan sementara oleh plate heating element yang berputar untuk memanaskan aliran primary air pada sisi lainnya. Penelitian terus dilakukan guna meningkatkan performa dari Rotary Air Preheater. Pada penelitian ini akan dipelajari pengaruh kecepatan rotasi dan kecepatan flue gas pada Rotary Air Preheater terhadap perpindahan panas transien plate heating element. Penelitian dilakukan secara simulasi Computational Fluid Dynamic serta membandingkanya dengan perhitungan manual menggunakan teori Lumped Capacitance Method dan Spatial Effect Approximate Solution. Pemodelan dilakukan pada single plate heating element yang dilewati oleh flue gas dalam satu arah aliran. Dalam penelitian ini dilakukan variasi pada parameternya, yaitu variasi kecepatan rotasi sebesar (2; 2,4; 2,8; 3,2; 3,6; 4; 4,4; 4,8; dan 5,2) rpm, sedangkan variasi untuk kecepatan masuk flue gas sebesar (4; 6; dan 8) m/s. Simulasi dilakukan secara transien untuk mendapatkan data perubahan temperatur tiap waktu yang nantinya akan dibandingkan antar variasi terhadap perpindahan panas transiennya. Untuk mengurangi error simulasi, dilakukan grid independance test sehingga diperoleh jumlah optimal elements pada meshing. Dari hasil penelitian yang dilakukan, didapatkan hasil peningkatan kecepatan flue gas yang linear mengakibatkan peningkatan Biot Number yang juga linear, serta menyebabkan peningkatan kenaikan perubahan temperatur plate heating element dan gradasi temperatur permukaanya tiap waktu secara logaritmik. Sedangkan peningkatan kecepatan rotasi yang linear mengakibatkan penurunan Fourier Number yang juga linear, akan tetapi menyebabkan penurunan kenaikan perubahan temperatur plate heating element, gradasi temperatur permukaannya dan kenaikan gradasi temperatur tebal tiap waktu secara logaritmik. Pada penelitian ini didapatkan kecepatan rotasi optimum sebesar 4,4 rpm.
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An important aspect of an energy industry is the operational efficiency of the industry. In the steam power plant (PLTU) industry, a tool is used to increase its efficiency, namely, Rotary Air Preheater (RAPH), where preheating is provided for primary water using heat from flue gas to be discharged. The heat from the flue gas stream is temporarily stored by a rotating plate heating element to heat the primary water stream on the other side. Research continues to improve the performance of the Rotary Air Preheater. In this research, the effect of rotational speed and flue gas velocity on the Rotary Air Preheater will be studied on the transient heat transfer of the plate heating element. The research was carried out by simulating Computational Fluid Dynamic and comparing it with manual calculations using the theory of Lumped Capacitance Method and Spatial Effect Approximate Solution. The modeling is carried out on a single plate heating element which is passed by flue gas in one direction of flow. In this study, variations in the parameters were carried out, namely variations in rotational speed of (2; 2.4; 2.8; 3.2; 3.6; 4; 4.4; 4.8; and 5.2) rpm, while variations for the flue gas inlet velocity of (4; 6; and 8) m/s. Simulations are carried out transiently to obtain data on changes in temperature each time which will later be compared between variations on the transient heat transfer. To reduce simulation errors, a grid independence test
was carried out to obtain the optimal number of elements in the meshing. From the results of the research conducted, it was found that a linear increase in flue gas velocity resulted in an increase in the Biot Number, which was also linear, and caused an increase in the temperature change of the plate heating element and the gradation of its surface temperature each time in a logarithmic manner. While the linear increase in rotational speed results in a decrease in the Fourier Number which is also linear but causes a decrease in the increase in the temperature change of the heating element plate, the gradation of its surface temperature and the logarithmic increase in the thickness temperature gradation each time. In this study, the optimum rotation speed was 4.4 rpm.

Item Type:	Thesis (Other)
Additional Information:	RSM 621.402 5 Nov a-1 2022
Uncontrolled Keywords:	Plate Heating Element, Perpindahan Panas Transien, Biot Number, Fourier Number.
Subjects:	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:	Mr. Marsudiyana -
Date Deposited:	24 Feb 2025 07:08
Last Modified:	24 Feb 2025 07:08
URI:	http://repository.its.ac.id/id/eprint/118858

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