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All Journal APTEK Jurnal Konversi Energi dan Manufaktur MACHINERY: Jurnal Teknologi Terapan Jurnal Foundry International Journal of Mechanics, Energy Engineering and Applied Science (IJMEAS)
Okviyanto, Toni
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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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
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%.
ANALISIS STRUKTUR MIKRO TERHADAP HASIL EKPERIMENTAL SAMBUNGAN LAS SMAW PADA BAJA KARBON ST 37 Okviyanto, Toni; Dibyo Setiawan; Gugun Nugraha; Sutrimo; Destri Muliastri
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.8049215

Abstract

Welding is a process of joining two or more metals using thermal energy to melt them. The thermal processes of welded joints affect the phase change and the physical, microstructural, and mechanical properties of the weld. The purpose of the activity, to analyze the results of SMAW welded joints, parameters of current strength, and seam angle of the ST 37 carbon steel microstructure is a continuation of previous publication activities. Variation of the current strength of 90 A, 100 A, 110 A and seam angles of 600 and 700 with electrodes Ø2.6 mm and Ø3.2 mm. During the welding process, a series of thermal cycles of the weld metal and HAZ occur, from thermalization to maximum temperature and then undergoing a cooling process. The final composition of the weld metal, filler metal, and the condition of the air in the weld area are factors for the formation of the microstructure. Microstructures such as acicular ferrite can improve the mechanical properties of the weld metal. Visualization of the microstructure using an optical microscope during the metallographic inspection process was carried out by observing the grain size and phase formed on the base metal, heat-affected zone (HAZ), fusion line (FL), and weld metal (WL). The results showed that the weld metal (WM) with a series of experiments tended to have a larger acicular ferrite structure. The conclusion of the microstructural analysis is that the greater the current strength and seam angle, the more acicular ferrite structures are formed.
PERANCANGAN TURBIN ANGIN SUMBU VERTIKAL SEBAGAI PEMBANGKIT LISTRIK (SKALA LABORATORIUM) Meidian Pratama, Risco; arifin, Fatahul; Sundari, Ella; Okviyanto, Toni; Yahya, Yahya; Martomi, Eka Satria; Firdaus, Firdaus
MACHINERY Jurnal Teknologi Terapan Vol. 4 No. 3 (2023): Machinery: Jurnal Teknologi Terapan
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.10122311

Abstract

Wind is one of the newest energy sources that is becoming increasingly popular nowadays. The use of wind energy can be converted into electrical energy for wind turbine cells. However, there are two types of wind turbines, namely horizontal and vertical. Holistic wind turbines are usually used in one direction while vertical wind turbines are used in all directions. The shape of the blades and the number of wind turbine blades greatly influence the power produced. So the research this time is to find out the influence of the blade shape that has been varied and the number of blades with wind speeds of 2.5 m/s, 3 m/s, 3.5 m/s and 4 m/s on the resulting generator power so that the efficiency results What has been obtained can be designed to design wind turbines with varied blade shapes. Testing was carried out in a laboratory designed independently with a wind source using a fan and Dimmelr air conditioner. The results of tests that have been carried out have the highest gelnelratolr power known at 4 blades with a wind speed of 4 m/s with a power value of 0.34 watts while the smallest gelnelratolr power is known at 2 blades with a wind speed of 2.5 m/s with rated power 0.04 Watt. So that the research results from all the tests, the highest efficiency value was obtained at 4 blades with a wind speed of 2.5 m/s with a value of 24.4% and the lowest efficiency value was obtained at 2 blades with a wind speed of 3 m/s 6, 4 %.
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.
PENGARUH VARIASI KUAT ARUS SMAW TERHADAP SIFAT MEKANIK BAJA AISI 1045: SMAW Current Variations Effect on Mechanical Properties of AISI 1045 Steel Muliastri, Destri; Iryani, Lenny; Setiawan, Dibyo; Ramadhan, Kukuh; Okviyanto, Toni
Jurnal Konversi Energi dan Manufaktur Vol. 9 No. 2 (2024)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.9.2.8

Abstract

This study discusses the effect of variations in the parameters of the welding process on the tensile strength and Vickers hardness tests. In general, it is widely known that in the fabrication process, welding is a very important process that is used to join two or more materials. The welding process is carried out with variations in the strength of the welding current, namely 75, 85, and 95 A. The experimental method used in this research is AISI 1045 steel material with a thickness of 6.0 mm. The results of the tensile strength test have the highest value at a current strength of 75 A which is equal to 756.642 MPa. The lowest tensile strength test results were obtained with a tensile strength of 687.608 MPa at a current strength of 95 A. specimens with variations in current strength of 95 A have the highest value in the Vickers hardness test, with a hardness value of 281.25 HV. From the research conducted it is known that as the welding current increases there is a decrease in the value of the tensile strength. The hardness value in the heat affected zone (HAZ) area of all test specimens has the highest value, while the hardness value of weld metal (WM) and base metal (BM) has almost the same hardness value.
Co-Authors Ahmad Imam Rifa’i Anwar, Zainuri Destri Muliastri Fatahul Arifin, Fatahul Firdaus Firdaus Gugun Nugraha HIDAYATI, BAITI Iryani, Lenny Martomi, Eka Satria Meidian Pratama, Risco Muhammad Irfan Dzaky Nasution, Ghifari Ramadhan, Kukuh Ramadhoni, Tri Satya Rifa'i, Ahmad Imam Rifa’i, Ahmad Imam Sampurno, Rachmat Dwi Satya Ramadhoni, Tri setiawan, Dibyo Sumarna, Herlin Sundari, Ella Sutrimo Yahya Yahya Zainuri Anwar Zikri, Ahmad