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All Journal AUSTENIT APTEK Kinetika MACHINERY: Jurnal Teknologi Terapan Jurnal Masyarakat Madani Indonesia Jurnal Foundry International Journal of Mechanics, Energy Engineering and Applied Science (IJMEAS) Majalah Teknik Mesin
Sumarna, Herlin
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Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences

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PROTOTYPE PENGERING BAHAN BAKU DAN PRODUK BIOPELET DITINJAU DARI ENERGI H2O YANG TERUAPKAN KE UDARA Lestari, Sutini Pujiastuti; Aswan, Arizal; Sumarna, Herlin
KINETIKA Vol. 10 No. 1 (2019): KINETIKA 01032019
Publisher : Politeknik Negeri Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Energy consumption in Indonesia is still dominated by the use of fossil-based energy, especially petroleum and coal. Therefore, biomass as a renewable energy source is an effort to reduce the use of fossil energy in Indonesia. Biopellet is one of the processing of biomass into solid fuel. In the process stage of making biopellet used dryer. In the prototype of drying machine, the independent variables are variation of raw material mix and fixed variable such as air velocity, drying time, and drying temperature. Based on the results of the research, the H2O concentration was evaporated and the H2O heat in the air was highest in the 60% mixture of wood powder: 40% rice husk. From mass of H2O evaporated equal to 14.84 gr and H2O heat in air equal to 136.506 grcal analyzed moisture content and calorific value of biopelet product. Water content obtained at 6.716% and the calorific value of 5,188.8506 grcal/gr has met the SNI 8021-2014 standard.
PERANCANGAN HEAT EXCHANGER SISTEM PEMANAS AIR BERBASIS SISTEM REFRIGERASI R410a Dzaky, Muhammad Irfan; Rifa’i , Ahmad Imam; Anwar, Zainuri; Hidayati, Baiti; Satya Ramadhoni, Tri; Okviyanto, Toni; Sumarna, Herlin; Zikri, Ahmad; Nasution, Ghifari
JURNAL FOUNDRY Vol. 7 No. 1 (2024): JURNAL FOUNDRY
Publisher : LPPM Politeknik Manufaktur Ceper

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62944/jf.v7i1.103

Abstract

Ketersediaan air panas dalam lingkungan apartemen memiliki peran krusial dalam memberikan kenyamanan, kebersihan, dan efisiensi bagi penghuninya. Perancangan sistem inovatif pemanas air yang menggabungkan prinsip dasar refrigerasi menjadi sorotan utama, dengan fokus pada pemahaman mendalam mengenai beragam sumber energi, termasuk pemanfaatan energi listrik, tenaga surya, dan panas buangan AC. Keselamatan penggunaan pemanas air juga ditegaskan sebagai hal yang penting, dengan penekanan pada risiko kebakaran akibat kelalaian dan tersengat aliran listrik. Tujuan utama penelitian ini adalah untuk merancang sistem pemanas air yang efektivitas berbasis sistem refrigerasi. Metode penelitian difokuskan pada perancangan sistem pemanas air (Air Conditioning Water Heater/ACWH) dengan prinsip refrigerasi R410a. Hasil perhitungan mengenai dimensi pipa tembaga yang optimal untuk memanaskan air hingga temperatur yang diinginkan, serta faktor termal yang terlibat, dijelaskan secara rinci. Heat exchanger yang digunakan adalah tipe double pipe dengan ukuran panjang pipa tembaga 16,68 meter mampu efektif memanaskan air dari 27°C menjadi 50°C dengan aliran 100 L/jam dengan ukuran diameter pipa 3/8 inci dan 1 1/8 inci dengan dimensi heat exchanger secara keseluruhan 106 cm x 69,3 cm.
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
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.
ANALISIS PENGARUH TOTAL DRY SOLID BLACK LIQUOR TERHADAP EFISIENSI RECOVERY BOILER Sumarna, Herlin; Hidayati, Baiti; Ramadhoni, Tri Satya; Okviyanto, Toni; Anwar, Zainuri; Rifa’i, Ahmad Imam
MACHINERY Jurnal Teknologi Terapan Vol. 4 No. 2 (2023): Machinery: Jurnal Teknologi Terapan
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.8085820

Abstract

In the pulp and paper industry, a large amount of biomass (wood) has been used and produces by-products or residues resulting from the industry including wood bark, remaining logging and black liquor which is one of the main biomass resources that can be used for energy purposes. Aside from being a fuel, the recovery boiler process can convert black liquor into green liquor, where green liquor will be needed in the pulp production process. Writing this journal aims to determine the effect of total dry solids in black liquor on the efficiency of recovery boilers. The analysis was carried out using energy calculations in the recovery boiler for five days. From the calculation results it is known that there is a decrease and increase in boiler recovery efficiency, this is caused by several factors, including the heat absorption process experienced by the boiler feed water, the mass of black liquor, and the percentage of total dry solids. The total dry solid will affect the water content that will enter the combustion chamber, the higher the % TDS the more water content will enter the combustion chamber and this will affect the recovery efficiency of the boiler. The highest boiler recovery efficiency calculation results occurred on the first day, namely 65.24% and the lowest boiler recovery efficiency calculation results occurred on the fourth day, namely 62.96%.
Geothermal Power Generation: Harnessing Electrical Energy Through The Organic Rankine Cycle (ORC) System Zikri, Ahmad; Sumarna, Herlin; Hidayati, Baiti; Anwar, Zainuri; Putri, Fenoria; Zamheri, Ahmad; Negash, Semir M; Nasution, Gaizka Ghifari
International Journal of Mechanics, Energy Engineering and Applied Science (IJMEAS) Vol. 2 No. 1 (2024): IJMEAS - January
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijmeas.v2i1.235

Abstract

The research employs a thermodynamic simulation method using an Engineering Equation Solver (EES), relying on theoretical calculations. This method is integrated into a geothermal power plant, precisely focusing on geothermal source temperatures of approximately 95ºC. The investigation centers on the heat transfer process within a high-temperature heat transfer fluid from geothermal sources, conveying stored heat to the Organic Rankine Cycle (ORC) evaporator. Three specific working fluids, R134a, R11, and R22, examine working fluid selection for ORC at 95ºC. The results highlight the R11 organic fluid as an optimal compromise, excelling in two crucial criteria. Firstly, R11 exhibits the highest net mechanical power, = 34.81 kW compared to alternative fluids. Secondly, it boasts the best energetic efficiency of the cycle, registering  = 16.01%, outperforming both R134a ( = 13.17%) and R22 ( = 12.64%). In summary, this study conducts a focused analysis of the energy aspects of an Organic Rankine Cycle (ORC) for electricity production using geothermal sources and organic fluids. Operating at a geothermal source temperature of 95ºC with a water flow rate of 80 lt/s and environmental conditions at 20ºC, the parametric study emphasizes the superiority of the R11 organic fluid. R11 emerges as the optimal choice, demonstrating the highest net mechanical power and superior energetic efficiency compared to alternative fluids, thereby contributing valuable insights to advancing sustainable and efficient energy technologies.
Static Analysis of Electric Vehicle Prototype Frame Ramadhoni, Tri Satya; Rifa'i, Ahmad Imam; Anwar, Zainuri; Hidayati, Baiti; Sumarna, Herlin; Okviyanto, Toni; Sampurno, Rachmat Dwi
International Journal of Mechanics, Energy Engineering and Applied Science (IJMEAS) Vol. 2 No. 1 (2024): IJMEAS - January
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijmeas.v2i1.242

Abstract

This study aims to determine the strength of the prototype car frame created by the SMES (Sriwijaya Mechanical Engineering Squad) team in participating in the KMHE (Energy Efficient Car Contest) and SEM (Shell Eco-Marathon). This prototype vehicle is an energy-efficient car with an electric motor drive and utilizes a hollow rectangular tube-shaped frame with aluminum 6061 material. The overall dimensions of the car frame are 2500x410x540 mm. Static loading analysis was conducted using manual calculations and computer simulations. Static loading was performed on seven support bars, the main bar, and the overall prototype car frame. Applied loads include the electric motor load, control panel, battery load, driver's body load, driver's legs, front body load, rollbar body load, rear body load, and reaction loads from bars receiving direct loads. Autodesk Inventor software with frame analysis features was used in the simulation process. Based on the results of manual calculations and computer simulations, the difference in the average results of maximum bending moment, maximum stress, and displacement on the seven types of support bars, with a small error tolerance below 10%, is 1.01%, 5.24%, and 3.25%, respectively. Based on computer simulation results for the main bar and seven types of support bars, the highest maximum stress occurs in the main bar, which is 128727.37 N.
PENERAPAN SISTEM REFRIGERASI PADA ALAT PEMBUAT ASAP CAIR UNTUK PENGOPTIMALAN HASIL PRODUKSI Sumarna, Herlin; ., Haryanto; Hidayati, Baiti; Homzah, Ozkar F
AUSTENIT Vol. 12 No. 2 (2020): AUSTENIT: Oktober 2020
Publisher : Politeknik Negeri Sriwijaya, Indonesia

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Abstract

Recently, liquid smoke is widely used for various needs, both for food purposes and for freezing rubber latex. Liquid smoke began to grow due to the large demand, also using biomass / waste as a base material. Immediate production results are needed by the condensation process. The application of the refrigeration system guides the temperature of the air which is used as a cooling medium in the condensation process during the process of making liquid smoke. This study uses coconut shell as raw material for pyrolysis, and there are 4 temperature variations that are applied in the liquid smoke production process. First without a refrigeration system, the application of a refrigeration system with temperature variations of 22 ° C, 18 ° C and the last one is 15 ° C. The data is taken every 30 minutes for 6 hours. Based on the research results, it was found that the maximum production results using the refrigeration system at an air temperature of 15 ° C, resulted in 375 ml of liquid smoke. Keywords: Liquid Smoke, Refrigeration, Pyrolysis, Coconut Shell
Optimalisasi Sistem Pompa Seri Dan Paralel Untuk Mendukung Pembibitan Kelapa Sawit Di "Gotama" Banyuasin Hidayati, Baiti; Sundari, Ella; Rasid, Muhammad; Sumarna, Herlin; Ramadhony, Tri Satya; Darus, Imam; Ramadhani, Kgs.M.Octarian; Fahrezi, M. Rifki
Jurnal Masyarakat Madani Indonesia Vol. 4 No. 4 (2025): November
Publisher : Alesha Media Digital

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59025/av0kjz11

Abstract

Kegiatan pengabdian ini dilakukan  untuk meningkatkan efisiensi penyiraman bibit kelapa sawit di CV. Gotama, Banyuasin. Daerah ini menghadapi banyak masalah dalam sistem irigasi karena kurangnya sumber air dan medan yang tidak ramah. Perbandingan sistem pompa seri dan paralel menunjukkan hasil yang signifikan, menurut penelitian yang dilakukan. Pemasangan pompa seri meningkatkan tekanan air sebesar 56% dibandingkan dengan sistem paralel, dan pompa paralel meningkatkan debit air sebesar 0,0354 m3/s dengan tekanan 9,08 psi, meningkatkan efisiensi aliran air sebesar 15%. Pelatihan dan sosialisasi teknis mengenai penggunaan pompa seri dan paralel telah dilakukan dengan baik. Evaluasi awal menunjukkan bahwa mitra lebih memahami prinsip dasar dan keuntungan masing-masing sistem. Sistem pompa akan dipasang di lahan mitra untuk pengujian dan pengawasan tambahan. Diharapkan bahwa operasi ini akan mengurangi pemborosan energi, meningkatkan distribusi air yang merata, dan mendukung pertumabuhan kelapa sawit yang berkelanjutan di daerah tersebut
Co-Authors Ahmad Imam Rifa’i Anwar, Zainuri Arizal Aswan Darus, Imam Fahrezi, M. Rifki Gurruh Dwi Septano Haryanto . HIDAYATI, BAITI Homzah, Ozkar F Muhammad Irfan Dzaky Nasution, Gaizka Ghifari Nasution, Ghifari Negash, Semir M Okviyanto, Toni Putri, Fenoria Ramadhani, Kgs.M.Octarian Ramadhoni, Tri Satya Ramadhony, Tri Satya Rasid, Muhammad Rifa'i, Ahmad Imam Rifa’i, Ahmad Imam Sampurno, Rachmat Dwi Satya Ramadhoni, Tri Sundari, Ella Sutini Pujiastuti Lestari Zainuri Anwar Zamheri, Ahmad Zikri, Ahmad