Re-Design Oil Cooler Pada Turbin Gas Dengan Analisa Termodinamika Dan Perpindahan Panas (Studi Kasus PT.Energi Mega Persada)

Rosady, Siti Duratun Nasiqiati (2014) Re-Design Oil Cooler Pada Turbin Gas Dengan Analisa Termodinamika Dan Perpindahan Panas (Studi Kasus PT.Energi Mega Persada). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pada sebuah pembangkit listrik tenaga gas, sistem pelumasan turbin sangat diperlukan. Pelumas yang telah digunakan didinginkan kembali menggunakan lube oil cooler. Lube oil cooler merupakan compact heat exchanger tipe circular tubes, continuous fins yang berfungsi sebagai pendingin oli dengan udara sebagai fluida pendingin. Pada kondisi operasional didapatkan bahwa temperatur oli keluar lube oil cooler masih cukup tinggi. Hal ini dapat menyebabkan turbin gas shut down. Berdasarkan kondisi tersebut, maka dilakukan analisa performa lube oil cooler existing dan melakukan redesign untuk meningkatkan effectiveness dari lube oil cooler. Analisa performa lube oil cooler existing meliputi perpindahan panas actual dan effectiveness. Sedangkan redesign dilakukan dengan variasi laju aliran massa fluida dingin (udara) dan surface designation berdasarkan standard Compact heat exchangers untuk tipe circular tubes, continuous fins. Dengan batasan yang digunakan dalam perancangan lube oil cooler adalah volume ruang penempatan heat exchanger. Perancangan menggunakan metode LMTD dan NTU meliputi perhitungan perpindahan panas pada sisi tube dan fins, area perpindahan panas, heat transfer actual, overall heat transfer coefficient serta effectiveness.Dari perhitungan yang telah dilakukan didapatkan effectiveness dari lube oil cooler existing adalah sebesar 13.6%. Berdasarkan analisa redesign, hasil yang memiliki performa yang paling baik adalah surface designation 8.0-3/8 T dengan laju aliran massa udara 7.5 kg/s dimana temperatur keluar oli sebesar 342.14 K dengan effectiveness menjadi 29%. Adapun detail dimensi redesign adalah jumlah tube 245, diameter tube 0.0102108 m, jumlah fins/ meter 315, transverse pitch 0.0219964 m dan longitudinal pitch sebesar 0.0254 m.
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In a gas power plant, turbine lubrication system was required. Lubricants that have been used cooled using lube oil cooler. Lube oil cooler is a compact heat exchanger circular tubes continuous fins type, that serve as oil cooler with air as thecooling fluid. At the operating conditions found that the lube oil cooler outlet temperature is still high. This can cause the gasturbine is shut down. Under these conditions, the performanceanalysis of the existing lube oil cooler and redesign to improve the effectiveness of lube oil cooler. Analysis of the performance of the existing lube oil coolercovers the actual heat transfer and effectiveness. While theredesign is done with the variation of the mass flow rate of cold fluid (air) and surface designation based on Standard Compact heat exchangers for the type of circular tubes, continuous fins. With the limits used in the design of the lube oil cooler is a heat exchanger chamber volume placement. Designing using LMTDand NTU methods include calculation of heat transfer on the tube and fins, the heat transfer area, the actual heat transfer, overall heat transfer coefficient and effectiveness. From the calculations have been done obtained effectivenessof existing lube oil cooler is 13.6%. Based on the analysis of redesign, the results of which have the best performance is surface designation 8.0-3 / 8 T with the air mass flow rate of 7.5 kg/ s where the oil exit temperature of 342.14 K with effectiveness
to 29%. The detailed dimensions of the redesign is the number oftube 245, tube diameter of 0.0102108 m, the number of fins/meter 315, transverse and longitudinal pitch 0.0219964 m a pitch of 0.0254 m.

Item Type:	Thesis (Other)
Additional Information:	RSM 621.433 Ros e
Uncontrolled Keywords:	Lube Oil Cooler, Compact Heat Exchanger, Circular Tube, Continuous Fins, LMTD, NTU, Overall Heat Transfer Coefficient, Effectiveness
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ263 Heat exchangers
Divisions:	Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Mr. Marsudiyana -
Date Deposited:	08 Jun 2023 07:20
Last Modified:	08 Jun 2023 07:20
URI:	http://repository.its.ac.id/id/eprint/98063

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