Dharma, Adji (2018) Thermal Design Cccw Heat Exchanger Pltu Dengan Variasi Kecepatan Sisi Pipa Dan Baffle Spacing Menggunakan Software Dan Analisis Termodinamika - Perpindahan Panas. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Open Cycle Cooling Water (OCCW) merupakan sistim pendingin yang mengunakan air laut sebagai media pendingin dengan laju aliran massa sebesar 750 ton/hr, system ini berfungsi untuk mendinginkan tiga komponen yaitu CCCW Heat Exchanger, H2 Generator dan Lube Oil Cooler. Pada saat operasi CCCW Heat Exchanger tidak mampu mengakomodasi beban pendinginan dari ketiga komponen tersebut karena isntalasi perpipaan yang memiliki diameter kecil. Oleh karena itu didesain heat exchanger yang akan mengakomodasi beban pendinginan CCCW Heat Exchanger, H2 Generator dan Lube Oil Cooler.Proses redesign CCCW HE diawali dengan menghitung cooling load total, sizing dan overall heat transfer coefficient lalu dilakukan Analisis pressure drop di sisi tube dan shell secara teoritis maupun dengan software desain.
Pada proses desain heat exchanger dilakukan variasi kecepatan dan baffle spacing dengan tujuan untuk mengetahui pengaruh dari perubahan parameter tersebut terhadap dimensi dan performa heat exchanger. Dari variasi tersebut akan diAnalisis untuk diketahui kecepatan dan baffle spacing optimal. Variasi kecepatan yang digunakan adalah 0,5 m/s, 1 m/s, 1,5 m/s dan 2 m/s, sedangkan variasi baffle spacing sebesar 800 mm, 900 mm 1000mm dan 1100 mm
Dari hasil perhitungan diketahui bahwa kecepatan akan meningkatkan koefisien konveksi sisi dalam secara linier dan pressure drop secara eksponential, peningkatan koefisien sisi dalam akan menyebabkan meningkatnya overall heat transfer dan menurunnya luasan perpindahan panas. Semakin besar baffle spacing memberikan dampak menurunnya koefisien konveksi sisi luar dan mnurunnya pressure drop sisi dalam. Dari kedua variasi tersebut didapat nilai dimensi utama (optimal) dengan panjang 6,98 meter, jumlah tube 1125, diameter shell 1,6 meter dan baffle spacing 900 ml pada saat kecepatan 1 m/s dan baffle spacing 900 mm
=========================================================================Open cycle cooling water (OCCW) is a cooling system which use sea water as cooler media with the mass flow rate of 759 ton/hr, this system have a main function to cooling three main component which is called CCCW heat exchanger, H2 generator and lube oil cooler. In the actual condition, CCCW heat exchanger cannot handle the heat load of those three component because of small piping diameter in piping installation. Thereforem a new heat exchanger will be designed to cover the heat load of CCCW heat exchanger, H2 generator and lube oil cooler. The design process of CCCW HE start by calculating the total heat load, sizing and heat transfer coefficient. Then, pressure drop in tube and shell side will be analyze by theoretical calculation or software simulation.
In the heat exchanger design process, there will be velocity and baffle spacing variation. The purpose of this variation is to acknowledge us about the effect of those variation to the heat exchanger dimension and performance. From that variation, analyzing process will be done to get the most optimal result.
From the calculation result, we can conclude that if the velocity increase, the convection coefficient will be linierly increase and the pressure drop will be exponentially increase. The increase of convection coefficient will effect the overall heat transfer coefficient (it will be increase) and the heat transfer area will be decrease. If the baffle spacing become larger, the convection coefficient and pressure drop of the shell side will be decrease. From the two variation, the most optimum dimension is when the HE have tube length of 6,98 meter, tube count of 1125, side diameter of 1,6 meter and baffle spacing of 900 mm.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Kata kunci: CCCW HE, H2 Generator Cooler , Luber Oil Cooler, Seawater , Demineral Water Overall Heat Transfer Coefficient, Pressure Drop, Shell and Tube |
| Subjects: | T Technology > TJ Mechanical engineering and machinery 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 > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Ikki Adji Dharma |
| Date Deposited: | 09 Jul 2021 10:14 |
| Last Modified: | 09 Jul 2021 10:14 |
| URI: | http://repository.its.ac.id/id/eprint/57366 |
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