Studi Numerik Pengaruh Konduksi Transien Plate Heating Element Terhadap Perpindahan Panas Untuk Mendapatkan Kecepatan Rotasi Rotary Air Preheater Optimum

Ezeddin, Muhammad Rizki (2023) Studi Numerik Pengaruh Konduksi Transien Plate Heating Element Terhadap Perpindahan Panas Untuk Mendapatkan Kecepatan Rotasi Rotary Air Preheater Optimum. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Efisiensi dari kegiatan operasional pembangkitan listrik pada Pembangkit Listrik Tenaga Uap (PLTU) merupakan aspek yang sangat diperhatikan. Salah satu upaya peningkatan efisiensi dari PLTU adalah dengan memanfaatkan Rotary Air Preheater (RAPH) yang berfungsi untuk memanaskan primary air dengan memanfaatkan panas dari flue gas yang hendak dibuang, sebelum memasuki boiler. Pada penelitian ini mempelajari pengaruh dari variasi material Stainless Steel, CorTen Steel Grade. A, dan Copper terhadap perpindahan panas transien pada plate heating element selama pemanasan oleh flue gas secara simulasi menggunakan perangkat lunak Ansys Fluent dengan pemodelan single plate heating element. Hasil dari simulasi dibandingkan dengan perhitungan manual transient conduction metode Approximate Solution dan Lumped Capacitance Method. Kecepatan rotasi divariasikan dari 2 rpm hingga 5,2 rpm dengan kecepatan masuk flue gas konstan sebesar 4 m/s untuk mendapatkan kecepatan rotasi optimum-nya untuk kemudian dibandingkan dengan variasi material plate heating element lainnya. Untuk mengurangi error simulasi, dilakukan grid independence test sehingga diperoleh jumlah optimal elements pada meshing. Dari hasil simulasi plate heating element dengan variasi material dan kecepatan rotasi yang telah dilakukan, didapatkan bahwa pada kecepatan rotasi 2 rpm, didapatkan temperature rata-rata pelat Stainless Steel, Corten Steel Gr. A, dan Copper berturut-turut sebesar 291,845℃, 292,043℃, dan 292,175℃. Kecepatan rotasi optimum Stainless Steel sebesar 4,4 rpm dan material Corten Steel Gr. A dan Copper sebesar 4,8 rpm. Pada kecepatan rotasi optimum, energy termal yang diserap oleh pelat Stainless Steel, Corten Steel Gr. A, dan Copper berturut-turut adalah sebesar 10640,7 joule, 9750,97 joule, dan 9749,76 joule.
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The efficiency of electricity generation operations at the Steam Power Plant (PLTU) is an aspect that is very concerned. One of the efforts to increase the efficiency of the PLTU is to utilize the Rotary Air Preheater (RAPH) which functions to heat the primary water by utilizing the heat from the flue gas to be discharged, before entering the boiler. In this study, we studied the effect of material variations of Stainless Steel, CorTen Steel Grade. A, and Copper on transient heat transfer on the plate heating element during heating by flue gas by simulation using Ansys Fluent software with single plate heating element modeling. The results of the simulation are compared with manual calculations of transient conduction Approximate Solution method and Lumped Capacitance Method. The rotational speed was varied from 2 rpm to 5.2 rpm with a constant flue gas inlet velocity of 4 m/s to obtain the optimum rotational speed and then compared with other plate heating element material variations. To reduce the simulation error, a grid independence test was conducted to obtain the optimal number of elements in the meshing. From the simulation results of the plate heating element with material variations and rotational speeds that have been carried out, it is found that at a rotational speed of 2 rpm, the average temperature of the Stainless Steel plate, Corten Steel Gr. A, and Copper are 291.845℃, 292.043℃, and 292.175℃ respectively. The optimum rotational speed of Stainless Steel is 4.4 rpm and that of Corten Steel Gr. A and Copper at 4.8 rpm. At the optimum rotational speed, the thermal energy absorbed by the Stainless Steel plate, Corten Steel Gr. A, and Copper are 10640.7 joules, 9750.97 joules, and 9749.76 joules respectively.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Plate heating element, konduksi transien, heat diffusivity, RPM optimum
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ164 Power plants--Design and construction 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:	Muhammad Rizki Ezeddin
Date Deposited:	16 Feb 2023 02:21
Last Modified:	16 Feb 2023 02:21
URI:	http://repository.its.ac.id/id/eprint/97237

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