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All Journal APTEK International Journal of Mechanics, Energy Engineering and Applied Science (IJMEAS) Majalah Teknik Mesin
Ramadhoni, Tri Satya
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Evaluasi Kinerja Efisiensi Heat Recovery Steam Generator (HRSG) di Pembangkit Listrik Tenaga Gas dan Uap (PLTGU): Studi Kasus di PT PLN (Persero) Sektor Pembangkit Keramasan Sumarna, Herlin; Hidayati, Baiti; Ramadhoni, Tri Satya; Dzaky, Muhammad Irfan; Okviyanto, Toni; Rifa'i, Ahmad Imam; Anwar, Zainuri
Aptek Jurnal Apliksai Teknologi (APTEK): Volume 17, No. 01, Desember 2024
Publisher : Fakultas Teknik Universitas Pasir Pengaraian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30606/aptek.v17i1.3044

Abstract

Heat Recovery Steam Generator (HRSG) adalah komponen penting dalam sistem Pembangkit Listrik Tenaga Gas dan Uap (PLTGU) yang memanfaatkan panas sisa dari gas buang turbin gas untuk menghasilkan uap yang digunakan dalam turbin uap. Efisiensi HRSG berperan signifikan dalam meningkatkan efisiensi termal keseluruhan siklus gabungan (combined cycle) PLTGU. Penelitian ini bertujuan untuk mengevaluasi kinerja dan efisiensi termal HRSG berdasarkan data operasional harian, serta membandingkannya dengan efisiensi desain dan standar industri. Berdasarkan hasil perhitungan, efisiensi termal aktual rata-rata HRSG adalah sebesar 82,90%, dengan nilai tertinggi sebesar 83,21% pada hari ketiga dan terendah sebesar 82,28% pada hari kelima. Nilai ini masih berada dalam kisaran standar efisiensi HRSG, yaitu 75-85% menurut referensi yang digunakan (V. Ganapathy, 1996), dan hanya berbeda sedikit dari efisiensi desain sebesar 85,91%. Perbedaan efisiensi ini disebabkan oleh fluktuasi laju alir massa bahan bakar serta variasi kondisi operasi lainnya. Kesimpulan dari penelitian ini menunjukkan bahwa efisiensi termal HRSG yang dioperasikan masih berada dalam batasan yang diinginkan, meskipun terdapat ruang untuk perbaikan lebih lanjut guna mencapai efisiensi yang mendekati desain. Optimasi operasi dan pemeliharaan rutin direkomendasikan untuk mempertahankan dan meningkatkan efisiensi sistem secara keseluruhan
Static Stress Analysis of Fork on Rubber Slab Lifting Aid using Finite Element Method Khoirullah, Ananda Thomas; Sampurno, Rachmat Dwi; Sailon, Sailon; Ramadhoni, Tri Satya; Rizal, Syamsul; Yuliandi, Rizky Brillian
International Journal of Mechanics, Energy Engineering and Applied Science (IJMEAS) Vol. 2 No. 3 (2024): IJMEAS - September
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijmeas.v2i3.316

Abstract

The focus of this research is to simulate the static stress on the fork component of the tool to analyze the strength and feasibility of the design. The simulation used a method called Finite Element Method (FEA), which allows to find any problems before the prototype is made. The material used is ASTM A36 steel with a yield strength value of 250 MPa. The loading used is 300 kg with the direction of the force centered on the y-axis of the beam right in the middle of the object. With variable fork design dimensions that have been simplified in the form of 762x101.6x31.75 mm; 1219.2x127x44.45 mm; and 2133.6x152.4x50.8 mm, the distribution of analysis results consisting of maximum bending stress, moment, displacement, and factor of safety is obtained. The maximum bending stress values for designs A, B, and C in the simulation are 65.688 MPa; 42.891 MPa; and 47.897 MPa, respectively, with moment values of 1121.283 N.m; 1793.758 N.m; and 3139.592 N.m. Meanwhile, the displacement values in the simulation results for each design are 2.508 mm; 2.992 mm; and 8.948 mm, respectively, with factor of safety values of 3.8; 5.8; and 5.2. Static stress analysis on the fork design produces analytical calculation values and simulation calculations with small tolerances. Based on the results of these calculations, it is concluded that the most optimal fork design is design B because it has a lower value of maximum bending stress and displacement, and has a higher factor of safety value than other designs.
COMPARATIVE ANALYSIS OF PRESSURE AND FLOW CHARACTERISTICS IN BASIC AND MODIFIED AIR COMPRESSOR PIPELINE USING COMPUTATIONAL FLUID DYNAMICS IN POWER PLANT TANJUNG ENIM 3X10 MW Septano, Gurruh Dwi; Ramadhoni, Tri Satya; Sumarna, Herlin
Media Mesin: Majalah Teknik Mesin Vol. 25 No. 1 (2024)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v25i1.2815

Abstract

Air compressor plays a crucial role by converting electrical energy into kinetic energy in the form of compressed air. This study specifically concentrates on assessing the performance of two compressors that operate alternately, with one compressor in standby mode. Unfortunately, compressor unit #1 faced issues with its drying system, rendering it unable to function within the current pipe network. In order to rectify this, proposed modifications to the pipeline network are introduced and scrutinized. To analyze these modifications, Computational Fluid Dynamics (CFD) is employed to evaluate and compare pressure and flow characteristics in both the existing and modified pipe configurations. The CFD analysis utilizes computer engineering software, with SolidWorks serving as the primary modeling and simulation tool. The assumption is made that the Reynolds number corresponds to laminar flow, factoring in pipe diameter and compressor volume rate.The resulting CFD data offers valuable insights into pressure and velocity distributions within the existing and modified pipeline networks. During the pressure simulation, surface pressure and output on both standard and modified pipes exhibit relatively similar pressure values at 7 bar. However, in the air velocity simulation, surfaces of standard and modified pipes maintain a consistent range of 0 – 5 mm/s. Notably, from the pipe output side, air velocity in standard and modified pipes displays distinct speed contours. Standard pipes show the highest speed between 0.25 – 0.38 mm/s, whereas modified pipes exhibit the highest speed within the range of 0.15 – 0.2 mm/s. This study aims to provide a comprehensive evaluation of the proposed modifications, seeking to enhance understanding of the fluid dynamics within air compressor systems. The outcomes of this research have the potential to contribute significantly to optimizing the performance and efficiency of these systems, thereby offering benefits across various industrial applications.
Co-Authors Ahmad Imam Rifa’i Gurruh Dwi Septano HIDAYATI, BAITI Khoirullah, Ananda Thomas Muhammad Irfan Dzaky Okviyanto, Toni Sailon, Sailon Sampurno, Rachmat Dwi Sumarna, Herlin Syamsul Rizal Yuliandi, Rizky Brillian Zainuri Anwar