BAGASKARA, DEWANGGA (2020) ANALISIS PERFORMA EFEKTIVITAS KERJA HEAT EXCHANGER HYDRAULIC SYSTEM SAAT TEMPERATUR NORMAL DAN TINGGI PADA LINE PRODUKSI SHEARING LINE 1 PT KRAKATAU STEEL DENGAN METODE LMTD DAN NTU. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
Hydraulic shearing line system has a heat exchanger that serves to reduce the temperature of the hydraulic oil due to the system usage process. Found a leaked from the actuator and hydraulic valve due to the temperature of the hot hydraulic oil and can cause the system to overheat and the hydraulic system to turn off. In this research, theoretical calculations of the effectiveness of heat exchangers using LMTD (logarithmic Mean Temperature Difference) and NTU (Number of Transfer Units) methods are based on normal temperature data on October 27-31 October 2019 which refers to the periodic heat exchanger maintenance history and high temperature data refers on mechanical delay data from March 2-6, 2020. Then the normal and high temperature data are simulated in the solidworks flow simulation software to determine the temperature distribution and get the temperature defiation value between theoretical calculations and after simulation. The theoretical calculation value of the effectiveness of normal temperature conditions of 46.64% has decreased by 14.99% in high temperature conditions. And defiation values obtained in the simulation of solidworks flow simulation of normal temperature conditions at the 47.8 oC hydraulic oil outlet and 39.45 oC cooling water outlet. while at high temperature conditions the hydraulic oil outlet is 51.83 oC and the cooling water outlet is 42.8 oC. The decrease in the value of the effectiveness of the heat exchanger is caused by fouling and leakage from the system, while the defiation value between the theoretical calculations and after the simulation of solidworks flow simulation is caused by factors not written on the theoretical calculations. Keywords: Shearing Line 1, Heat Exchanger, Effectiveness, Solidworks Flow Simulation. System hydraulic shearing line memiliki heat exchanger yang berfungsi untuk menurunkan temperatur oil hydraulic akibat proses pemakaian system. Ditemukan kebocoran dari aktuator dan valve hydraulic akibat temperatur oil hydraulic panas serta dapat menyebabkan system overheat dan mengakibatkan system hydraulic mati. Pada penelitian ini dilakukan perhitungan teoritis efektivitas heat exchanger menggunakan metode LMTD (logarithmic Mean Temperature Difference) dan NTU (Number of Transfer Units) berdasarkan data temperatur normal pada tanggal 27-31 Oktober 2019 yang mengacu pada histori perawatan berkala heat exchanger dan data temperatur tinggi mengacu pada data delay mekanik 2-6 Maret 2020. Kemudian data temperatur normal dan temperatur tinggi disimulasikan pada software solidworks flow simulation untuk mengetahui distribusi temperatur dan mendapat nilai defiasi temperatur antara perhitungan teoritis dan setelah simulasi. Didapatkan nilai perhitungan teoritis efektivitas kondisi temperatur normal sebesar 46,64% mengalami penurunan sebesar 14,99% pada kondisi temperatur tinggi. Serta didapatkan nilai defiasi pada simulasi solidworks flow simulation terhadap kondisi temperatur normal pada outlet oil hydraulic 47,8 oC dan outlet air pendingin 39,45 oC. sedangkan pada kondisi temperatur tinggi outlet oil hydraulic 51,83 dan outlet air pendingin 42,8 oC. Penurunan nilai efektivitas heat exchanger disebabkan oleh fouling dan kebocoran dari system, sedangkan nilai defiasi antara perhitungan teoritis dan setelah simulasi solidworks flow simulation disebabkan oleh faktor-faktor yang tidak ditulis pada perhitungan teoritis. Kata kunci : Shearing Line 1, Heat Exchanger, Efektivitas, Solidworks Flow Simulation
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