Analisa Dan Redesign Intercooler Shell And Tube Pada Closed Cooling Water System

Aljufri, Muhammad Hanif (2023) Analisa Dan Redesign Intercooler Shell And Tube Pada Closed Cooling Water System. Other thesis, institut teknologi sepuluh nopember.

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Abstract

PLTGU Muara Tawar merupakan pembangkit listrik berkapasitas 2.050 Mw yang terhubung dengan sistem interkoneksi Jawa-Bali 500 kV. Pada siklus kerja PLTGU Muara Tawar diperlukan heat exchanger untuk mengubah temperatur dan fasa suatu jenis fluida. Proses perpindahan panas dari fluida bertemperatur tinggi ke fluida bertemperatur rendah digunakan dalam proses ini. Closes Cooling Water (CCW) System adalah siklus yang menggunakan air untuk mendinginkan sistem atau peralatan secara berulang. Heat Exchanger digunakan dalam proses Closed Cooling Water System. Proses perpindahan panas dilakukan di Heat Exchanger antara fluida panas yang sebelumnya digunakan sebagai pendingin pada peralatan lain dengan fluida dingin yang diperoleh dari air laut, dan proses ini dilakukan secara berulang. Shell and Tube Heat Exchanger adalah jenis penukar panas yang digunakan karena desain konstruksinya yang sederhana, kemudahan perawatan, kemampuan menangani cairan korosif, dan kemampuan menahan suhu dan tekanan tinggi. Log Mean Temperature Difference (LMTD) dan Number of Transfer Units (NTU) – metode efektivitas digunakan untuk menganalisis penukar panas. Suhu masuk dan keluar air laut dan air make-up digunakan sebagai input. Berdasarkan perhitungan yang dilakukan, terdapat penurunan laju perpindahan panas dan efektivitas penukar panas dalam kondisi operasi. Temuan penelitian yang diperoleh dengan membandingkan efektivitas kinerja intercooler antara kondisi commissioning dan kondisi eksisting dan perancangan ulang dengan memodifikasi variabel dan parameter untuk menjaga efektivitas intercooler. Setelah dilakukannya variasi terhadap flow fluida dingin, dibutuhkan lebih dari 300 kg/s agar mencapai nilai efektivitas yang diinginkan yakni 0.5 namun terdapat limitasi yaitu laju aliran yang tidak dapat melebihi 165 kg/s. Setelah dilakukan variasi terhadap dimensi tube dengan didapatkan nilai effectiveness sebesar 0.48 pada ukuran 1.25 inci yang mana nilai tersebut mendekati target desain sebesar 0.5. Dengan dimensi tersebut didapatkan luasan area sebesar 251 m² dan jumlah tubes sebanyak 173.
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PLTGU Muara Tawar is a power plant with a capacity of 2,050 Mw which is connected to the 500 kV Java-Bali interconnection system. In the Muara Tawar PLTGU work cycle, a heat exchanger is needed to change the temperature and phase of a type of fluid. The process of transferring heat from a high temperature fluid to a low temperature fluid is used in this process. Closed Cooling Water (CCW) System is a cycle that uses water to cool the system or equipment repeatedly. Heat Exchangers are used in the Closed Cooling Water System process. The heat transfer process is carried out in the Heat Exchanger between the hot fluid which was previously used as a coolant on other equipment and the cold fluid obtained from seawater, and this process is carried out repeatedly. Shell and Tube Heat Exchanger is a type of heat exchanger that is used due to its simple construction design, ease of maintenance, ability to handle corrosive liquids, and ability to withstand high temperatures and pressures. Log Mean Temperature Difference (LMTD) and Number of Transfer Units (NTU) – effectiveness methods used to analyze heat exchangers. The inlet and outlet temperatures of seawater and make-up water are used as inputs. Based on the calculations made, there is a decrease in the rate of heat transfer and the effectiveness of the heat exchanger under operating conditions. The research findings were obtained by comparing the effectiveness of intercooler performance between commissioning conditions and existing conditions and redesign by modifying variables and parameters to maintain intercooler effectiveness. After making variations on the cold fluid flow, it takes more than 300 kg/s to achieve the desired effectiveness value of 0.5 but there is a limitation, namely the flow rate cannot exceed 165 kg/s. After varying the dimensions of the tube, we obtained an effectiveness value of 0.48 at 1.25 inches, which is close to the design target of 0.5. With these dimensions, an area of 251 m² is obtained and the number of tubes is 173.

Item Type: Thesis (Other)
Uncontrolled Keywords: intercooler, shell and tube heat exchanger, closed cooling water system, heat transfer, log mean temperature difference, number of transfer unit.
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ263 Heat exchangers
Divisions: Faculty of Industrial Technology and Systems Engineering (INDSYS) > Industrial Engineering > 26201-(S1) Undergraduate Thesis
Depositing User: Muhammad Hanif Aljufri
Date Deposited: 16 Feb 2023 10:35
Last Modified: 16 Feb 2023 10:35
URI: http://repository.its.ac.id/id/eprint/97344

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