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All Journal Jurnal Edukasi Elektro JDE (Journal of Developing Economies) Jurnal Teknologi Terapan Jambura Journal of Electrical and Electronics Engineering Kinetika Journal of Energy and Electrical Engineering (JEEE) Quantum Teknika
Naimah, Khoirun
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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COAL LIQUEFACTION USING CATALYTIC THERMAL CRACKING REACTOR WITH DIRECT METHODE Naimah, Khoirun; Rusnadi, Irawan
KINETIKA Vol. 8 No. 3 (2017): KINETIKA 01112017
Publisher : Politeknik Negeri Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (453.68 KB)

Abstract

Coal Liquefaction Technology merupakan salah satu bagian dari Clean Coal Technology yang bertujuan untuk memanfaatkan nilai guna batubara peringkat rendah sebagai bahan bakar. Metode yang digunakan dalam proses pencairan batubara adalah metode langsung, dimana reaksi ini terjadi didalam sebuah reaktor yang terbuat dari pipa stainless steel kapasitas 3 Liter dengan kondisi operasi suhu mencapai 375˚C, tekanan mencapai 6 bar dan waktu operasi selama ±2 jam. Didalam reaktor ini terdapat batubara, pelarut, dan katalis. Sampel batubara yang digunakan adalah berasal dari daerah Tanjung Enim, Lahat, dan Muba, dengan ukuran diameter batubara 60, 170, dan 200 mesh. Jenis pelarut yang digunakan adalah kerosene dan sikloheksana. Perbandingan rasio bb dan pelarut adalah 1:1-1:3. Kemudian, jenis katalis yang digunakan adalah ZnCl2, Fe3O4, dan Al2O3, dengan persen penggunaan 3-5%weight. Pada analisis hasil volume produk, nilai produk maksimalditunjukkan pada jenis batubara lignit dari Tanjung Enim dengan ukuran batubara 200 mesh, jenis pelarut kerosene dengan rasio bb:pelarut 1:2, dan jenis katalis ZnCl2 dengan 3%wt yakni 503 ml. Hal ini disebabkan pada kondisi tersebut, batubara memiliki kandungan hydrogen dan kadar zat terbang yang tinggi, kandungan hydrogen pelarut yang tinggi juga sehingga dapat berperan dengan baik, katalis yang merupakan jenis paling reaktif dibanding yang lainnyasehingga dalam proses pencairan batubara mudah untuk dicairkan. Produk yang dihasilkan memiliki nilai kalor yang berbeda dari teoritis, Hal ini disebabkan oleh rendahnya kondisi operasi yang digunakan, sehingga komposisi produk batubara cair yang dihasilkan adalah campuran alkane C5H12-C7H16.
ANALISA KONSUMSI ENERGI DAN SISTEM PENCAHAYAAN GEDUNG C INSTITUT TEKNOLOGI SUMATERA Naimah, Khoirun
Journal of Energy and Electrical Engineering Vol 2, No 2: April 2021
Publisher : Teknik Elektro Universitas Siliwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37058/jeee.v2i2.2607

Abstract

Peran energi dalam memenuhi kebutuhan dasar kehidupan manusia dalam pembangunan nasional khususnya dalam lembaga pendidikan sangat penting, khususnya energi listrik. Peningkatan maupun penurunan kegiatan yang dilakukan oleh lembaga pendidikan dapat memberikan dampak pada konsumsi energi listrik, seperti kampus Institut Teknologi Sumatera. Oleh karena itu, penelitian ini berfokus untuk mengetahui dan menganalisis profil konsumsi energi listrik dan sistem pencahayaan di Gedung C Institut Teknologi Sumatera yang digunakan sebagai ruang dosen dan administrasi. Metode yang digunakan adalah secara kualitatif dengan observasi lapangan dan wawancara dengan pihak terkait. Data yang diperoleh kemudian diolah sehinggan diperoleh nilai IKE dan informasi sistem pencahayaan. Hasil yang diperoleh menunjukkan bahwa (1) Gedung C termasuk dalam kategori efisien (2) Sistem pencahayaan mengkonsumsi energi listrik 7% dari total konsumsi listrik, dan tingkat pencahayaan Gedung C sudah sesuai dengan standard SNI 6197:2011 (4) Program konservasi yang sudah dilakukan yaitu dengan menyalakan lampu selang seling, mematikan lampu saat jam 10 malam keatas dan hanya menggunakan lampu pada lantai 1 ketika malam hari, semua kegiatan pembersihan dilakukan sebelum jam 10 malam.
STUDI NUMERIK KINERJA HEAT SINK BERBASIS ALIRAN DUA FASE DENGAN ETIL ASETAT SEBAGAI ALTERNATIF PENDINGIN CONCENTRATED PHOTOVOLTAICS Arirohman, Ilham Dwi; Naimah, Khoirun; Syaukani, Muhammad; Sabar, Sabar
Jurnal Teknologi Terapan Vol 11, No 2 (2025): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jtt.v11i2.814

Abstract

Concentrated Photovoltaic (CPV) technology offers the potential to enhance solar energy conversion by utilizing light focusing technology to increase the solar irradiation flux received by photovoltaic cells. On the other hand, as the solar energy density increases on a PV cell, the surface temperature of the PV also rises, which results in decreased energy conversion efficiency and the possibility of thermal fatigue. Therefore, a reliable cooling system is required for CPV. This study aims to evaluate the performance of a two-phase flow heat sink with ethyl acetate (C4H8O2) as the working fluid, which has a low boiling point and high heat of vaporization, making it quite effective for heat transfer. The method used is numerical simulation using Computational Fluid Dynamics (CFD) software. The simulation results show that the heat sink heat transfer effectiveness is 86.03%, with a thermal resistance value of 0.0073 . The highest temperature on the solid part is 105  showing an increasing trend but not significantly, while the average fluid temperature tends to remain constant at 55 . This indicates that the evaporation process is able to maintain the heatsink temperature at stable level.
Pengaruh Plugging Terhadap Kinerja High Pressure Heater Tipe Shell and U-Tube Heat Exchanger (Studi Kasus: Unit 1- 4 di PT ABC) Muhammad, Ghaffar; Arirohman, Ilham Dwi; Naimah, Khoirun
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 6 No. 2 (2025): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v6i2.23010

Abstract

High Pressure Heater (HPH) is an auxiliary component used to be required in regenerative steam power plants. The component is a heat exchanger utilized to enhance the power plant’s efficiency by enabling high pressure heating process for feedwater before entering the economizer in boiler using bled steam from turbine. The heat transfer effectiveness of HPH needs to be evaluated in relation to its operational conditions which are equipped with plugs to overcome leaks. This study aims to evaluate the impact of number of plugs on the high-pressure heater 5 in unit 1-4 PT ABC regarding heat transfer and its effectiveness. The Number of Transfer Unit (NTU) method along with Log Mean Temperature Difference (LMTD) method were employed in analysis of this research. The existing number of plugs are 4, 574, 100, and 111 in unit 1, 2, 3, and 4 respectively. The result shows that the heat transfer value for high pressure heaters in unit 1-4 PT ABC are 16.18 MW, 10.32 MW, 15.20 MW and 15.08 MW respectively, while the effectiveness value are 0.89, 0.74, 0.88, and 0.88. The study concludes that the effect of number of plugs in high-pressure heater regarding to heat transfer and effectiveness tends to be inversely linear.
Financial Analysis of Green Petroleum Coke as A Coal Blend in Steel Industry to Support National Energy Security Naimah, Khoirun; Sasongko, Nugroho Adi; Widayatno, Rudy Laksmono
Journal of Developing Economies Vol. 6 No. 2 (2021)
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jde.v6i2.24825

Abstract

Green Petroleum Coke (GPC), produced by Pertamina RU II Dumai, is the product of refined petroleum, which still has good quality but has not been utilized to its full potential. Such as Sulfur 0.5%; FC 86.03%; Ash 0.10%; VM 13.82%; Moist 10, 52%; and the calorific value of 7500 kcal/kg. Therefore, one effort that can do is diversification, namely the use of GPC as a mixture of other fuels (fossil) to increase the selling value of GPC. This diversification is also in line with the national energy policy in PP. 79/2014 that the program aims to increase the availability of national energy sources. This study aims to determine the feasibility of using GPC as a coal mixture in Industry (Krakatau Steel) with an overview of economic aspects. Data obtained by qualitative methods consisting of interviews, observation, and documentation. Based on the research results from 2 scenarios, both scenario 1 (GPC 4%) and scenario 2 (GPC 18%), it is found that the NPV is positive, IRR is above the discount rate, and BCR> 1. Thus, the use of GPC as a coal mixture is considered feasible to run and can support national energy security. Keywords: Diversification, Feasibility, Petroleum Coke, Investment DecisionJEL: G11, G32
Analysis of Electrical Energy Consumption in Office Buildings of the Institute Technology of Sumatra in Energy Conservation and Efficiency Efforts Naimah, Khoirun; Arirohman, Ilham Dwi; Zen, Muhammad Rizky; Wicaksono, Rihardian Maulana; Soelami, F.X. Nugroho; Rahmatullah, Abri; Purba, Leonardo D.; Gaol, Javeni Eysama L.
Jurnal Edukasi Elektro Vol. 7 No. 2 (2023): Jurnal Edukasi Elektro, Volume 7, Nomor 2, 2023
Publisher : DPTE FT UNY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jee.v7i2.65003

Abstract

Electrical energy is one of the basic human needs in carrying out various activities or daily activities, especially in office buildings such as office buildings of state higher education institutions, namely the Sumatra Institute of Technology (ITERA). Office buildings are the third highest consumer of electrical energy after shopping centers and hotels. The high demand for electrical energy requires the user sector to make efficiency in energy use. Before making efficiency, it is necessary to know the profile of electrical energy consumption including energy consumption intensity (ECI) and significant energy users. Therefore, in this study, an analysis of electrical energy consumption in each ITERA office building was carried out, through observation and interviews according to SNI / ISO 50002: 2018 energy audit procedures. The results obtained show that the total energy use of the 6 largest buildings (A, B, C, D, E, and F) in May 2023 is 144768 kWh and from the calculation of the ECI value is in the very efficient category (7.44 kWh/m2/month). From 6 existing buildings, there are 3 buildings that are very efficient, 1 building is efficient, and 2 buildings are quite efficient. Then, significant energy users were found by 83% in building C AC. Recommendations for saving energy in the effort of energy conservation and efficiency that can be done include, making changes in habits / patterns of use of electrical energy user equipment, especially in air conditioners and dispensers, so as to save electricity 2-21%, and retrofitting refrigerant AC types of split ducts and cassettes that still use R-22 with MC-22 which can save electricity 15-25%.
Analysis of Electrical Energy Consumption and Lighting Systems in PT X Lampung Office Buildings Naimah, Khoirun; Rahmatullah, Abri; Yunesti, Putty
Jambura Journal of Electrical and Electronics Engineering Vol 6, No 2 (2024): Juli - Desember 2024
Publisher : Electrical Engineering Department Faculty of Engineering State University of Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jjeee.v6i2.25215

Abstract

Electricity plays a crucial role in the operations of companies and offices, as highlighted in the 2022 data from the Ministry of Energy and Mineral Resources. The commercial sector recorded an energy usage of 49.65 million BOE (Barrel Oil Equivalent) and 68.891 GWh of electricity consumption. Excessive use of electrical equipment leads to wastage, resulting in higher electricity bills. Thus, there is a need for an efficient system in both lighting and other areas, with efforts focused on enhancing energy efficiency through conservation.This Final Project aims to determine and analyze Energy Consumption Intensity (IKE) values, lighting systems, and identify opportunities for electricity consumption savings at the PT. X Lampung Office Building. The research method involves an initial energy audit and brief measurements on the lighting system. Results indicate that, out of 13 rooms on all three floors, only 5 meet the standards. The analysis identifies opportunities for electricity consumption savings, with a no-cost method at 8.1% and a low-cost method at 9.1%. These findings are expected to serve as recommendations for identifying energy-saving opportunities in Indonesian office buildings.
Co-Authors Arirohman, Ilham Dwi FX Nugroho Soelami Gaol, Javeni Eysama L. Irawan Rusnadi Muhammad Syaukani Muhammad, Ghaffar Nugroho Sasongko Jati, Nugroho Sasongko Purba, Leonardo D. Rahmatullah, Abri Sabar Sabar Wicaksono, Rihardian Maulana Widayatno, Rudy Laksmono Yunesti, Putty Zen, Muhammad Rizky