Analisa Dampak Penurunan Kinerja Lube Oil Cooler Pada Turbin di PLTU Belawan

Husin Ibrahim; Amirsyam Nasution; Indra Hermawan; Muhammad Idris Hutasuhut

doi:10.31289/jmemme.v4i1.3282

Analisa Dampak Penurunan Kinerja Lube Oil Cooler Pada Turbin di PLTU Belawan

JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY ◽

10.31289/jmemme.v4i1.3282 ◽

2020 ◽

Vol 4 (1) ◽

pp. 10-23

Author(s):

Husin Ibrahim ◽

Amirsyam Nasution ◽

Indra Hermawan ◽

Muhammad Idris Hutasuhut

Keyword(s):

Heat Exchanger ◽

Cross Flow ◽

Compact Heat Exchanger ◽

Oil Cooler

Lube oil cooler adalah cross flow compact heat exchanger yang berfungsi untuk melepaskan panas yang dibawa oleh minyak pelumas dialirkan melalui sisi shell menuju sisi tube dengan fluida pendingin air demin dimana masing-masing cairan dipisahkan di dalam lube oil cooler. PT. PLN Sektor Pembangkit Belawan merupakan salah satu unit pembangkit tenaga listrik di wilayah Sumatera Utara yang kinerja dan kehandalannya sangat penting untuk menjamin kelangsungan pasokan listrik. Dari penelitian ini, rasio koefisien perpindahan panas disisi shell dan pipa tube serta efektivitas perpindahan panas yang terjadi dapat diketahui dengan menganalisa temperatur masuk dan keluar aliran air pendingin dan minyak pelumas dapat ditentukan. Selain itu dampak dan penyebab penurunan kinerja lube oil cooler dapat diketahui. Penelitian ini berfokus pada analisis data temperatur masuk dan keluar pendingin minyak pelumas dan tekanan diferensial yang tercermin dari data operasional yang dikumpulkan dari ruang kontrol lembar kertas PLTU Belawan.

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Numerical Study of Fluid Flow and Heat Transfer Enhancement of Nanofluids over Tube Bank

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.388.149 ◽

2013 ◽

Vol 388 ◽

pp. 149-155 ◽

Cited By ~ 6

Author(s):

Mazlan Abdul Wahid ◽

Ahmad Ali Gholami ◽

H.A. Mohammed

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Pressure Drop ◽

Heat Transfer Rate ◽

Transfer Rate ◽

Cross Flow ◽

Bulk Temperature ◽

Compact Heat Exchanger ◽

Pure Fluid ◽

Tube Banks

In the present work, laminar cross flow forced convective heat transfer of nanofluid over tube banks with various geometry under constant wall temperature condition is investigated numerically. We used nanofluid instead of pure fluid ,as external cross flow, because of its potential to increase heat transfer of system. The effect of the nanofluid on the compact heat exchanger performance was studied and compared to that of a conventional fluid.The two-dimensional steady state Navier-Stokes equations and the energy equation governing laminar incompressible flow are solved using a Finite volume method for the case of flow across an in-line bundle of tube banks as commercial compact heat exchanger. The nanofluid used was alumina-water 4% and the performance was compared with water. In this paper, the effect of parameters such as various tube shapes ( flat, circle, elliptic), and heat transfer comparison between nanofluid and pure fluid is studied. Temperature profile, heat transfer coefficient and pressure profile were obtained from the simulations and the performance was discussed in terms of heat transfer rate and performance index. Results indicated enhanced performance in the use of a nanofluid, and slight penalty in pressure drop. The increase in Reynolds number caused an increase in the heat transfer rate and a decrease in the overall bulk temperature of the cold fluid. The results show that, for a given heat duty, a mas flow rate required of the nanofluid is lower than that of water causing lower pressure drop. Consequently, smaller equipment and less pumping power are required.

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