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All Journal TEKNIK Teknika: Jurnal Sains dan Teknologi Prosiding Semnastek Jurnal Ilmiah Teknik Mesin Jurnal Teknik Mesin Spektra: Jurnal Fisika dan Aplikasinya Jurnal Hilirisasi IPTEKS (JHI) Jurnal Teknik Mesin Jurnal Abdi: Media Pengabdian Kepada Masyarakat International Journal of Industrial Optimization (IJIO) Teknomekanik METAL : Jurnal Sistem Mekanik dan Termal SAINSTEK Prosiding Seminar Nasional Teknik UISU (SEMNASTEK) Analit: Analytical And Environmental Chemistry
Adjar Pratoto, Adjar
Universitas Andalas
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The Effect of Tilt Angle of Axial Fan Blades on Air Flow Distribution in the Cabinet Dryer: Simulation Study Using Computational Fluid Dynamics Saputra, Agus Dian; Pratoto, Adjar; Gusriwandi, Gusriwandi; Suprianto, Joko
Teknomekanik Vol. 4 No. 1 (2021): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (681.652 KB) | DOI: 10.24036/teknomekanik.v4i1.8772

Abstract

The application of tray dryer is widely used for various commodity dryers due to its simple construction. However, one of the drawbacks of tray dryer is the uneven airflow distribution in the drying chamber which results in the drying rate in the tray position being unequal. As a result, the degree of dryness of the product also varies. This study investigated the effect of fan blade angle on airflow distribution in the dryer cabin through numerical simulations. The axial fan diameter was 350 mm with a thickness of 20 mm. The variations of axial fan blades used were 10o, 20o, 30o and 45o. The number of blades used was 4, and the allowable airflow limit was 2 m x 1 m x 1 m, with an axial fan rotation of 500rpm. Based on the simulation results, the 45o fan angle had good air distribution results compared to the 10o, 20o, and 30o fan angles. Likewise, the distribution of air produced by the fan was evenly distributed, because the greater the angle of the fan used for the dryer, the better the results would be obtained.
Exergy Analysis of Power Plants That Utilize Waste Heat from Cement Plants in West Sumatera Heroza, Nadry; Pratoto, Adjar
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol 14, No 1 (2025)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v14i1.15307

Abstract

Exergy analysis of power plants that utilize exhaust heat at Cemen plant was carried out to identify the reliability of the generator as a whole system or for each component that could be used as a basis for optimizing the utilization of exhaust heat and optimizing the operation of the generator to make it more efficient with increasing usage life. The exergy flow and efficiency are calculated for each component, and the data is then used to calculate how much exergy is destroyed in each component. Calculations are also carried out on the system at the time of commissioning in order to get how much the exergy efficiency has changed since the system was operational. The components of this plant include an SP boiler, AQC boiler, turbine, condenser, condensate pump, Flasher, boiler feed pump, and economist. AQC boiler is the component with the highest exergy value that is destroyed, which is 4405.34 kW or 32.98% of the total exergy destroyed in the system. The condensate pump is the component that has the smallest destroyed exergy value of 18.94 kW (0.14%). The system efficiency in January 2012 was 62.60% and decreased in December 2019 to 53.04%, where the overall system exergy efficiency decreased by 9.56% within 7 years of operation.
TAGUCHI EXPERIMENTAL STUDY: THE EFFECT OF BAY LEAF EXTRACT WEIGHT PERCENTAGE AND SAMPLE SIZE ON THE CHARACTERISTICS OF POLYVINYL ALCOHOL FILMS Hery Sunarsono; Hairul Abral; Adjar Pratoto; Elisabeth Feberlian Gulo; Melbi Mahardika; Mat Uzir Wahit; Vitri Aprila Handayani
Analit : Analytical and Environmental Chemistry Vol. 10, No. 02 October (2025) Analit : Analytical and Environmental Chemistry
Publisher : Jurusan Kimia FMIPA Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/analit.v10i02.231

Abstract

This research aims to determine the optimum parameters for incorporating Indonesian bay leaf extract (DS) into a polyvinyl alcohol (PVA) matrix to form a new polymer, PVA/DS. Taguchi's experimental method was employed to obtain the anti-UV properties and optimal mechanical characteristics of the PVA/DS polymer. Factors studied include DS concentration and sample size. The experimental design was prepared using an orthogonal array L16. The ability to block UV radiation (anti-UV) and the mechanical properties of polymer films are determined using UV Vis spectra and tensile testing (ASTM D638). The results of the Signal-to-Noise Ratio analysis show that the DS concentration factor is the most dominant variable in the anti-UV response, with a DS concentration influence factor (delta) value of 72.261, compared to a sample thickness of 1.605. Likewise, for elongation at break, the delta value of DS concentration is 2.43, which is higher than the cross-sectional area of 1.31. Meanwhile, for the tensile strength performance, neither factor was significant; however, the cross-sectional area factor was more dominant than the DS concentration, with a cross-sectional area delta value of 3.29, which is higher than the DS concentration of 2.77. The addition of DS concentration to the anti-UV response is able to block 100% of UV rays compared to PVA, which is only 16%. Meanwhile, for tensile strength, there was a 50.98% increase. The tensile strength of PVA/DS1 reached 75.67 MPa compared to PVA, which was only 50.12 MPa. Meanwhile, elongation at break increased by 14.71% in PVA/DS0.5 (304.43%) compared to PVA (265.40%). Thus, this research successfully applied the Taguchi method to identify the optimum factor combination with a minimum number of experiments. PVA/DS1 film (1% DS) is a film with optimum conditions that can provide superior performance, making it an alternative to conventional plastics that do not decompose easily
Penurunan Konsumsi Energi Spesifik (KES) pada Pabrik Semen melalui FMEA dan Manajemen Energi Adjar Pratoto; Ridwan Muchtar
Jurnal Ilmiah Teknik Mesin FEMA Vol. 3 No. 1 (2025)
Publisher : FT UNILA

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

Abstract

Industri semen termasuk salah satu industri intensif energi dengan biaya energi yang mencapai 35% - 50% dari total biaya produksi. Sumber energi utama pada pabrik semen adalah batu bara dan listrik. Kinerja penggunaan energi dapat dilihat dari konsumsi energi spesifik (KES) dari pabrik yang bersangkutan. Pada makalah ini dibahas kemungkinan penurunan KES di sebuah unit produksi semen dengan kapasitas 7800 ton per hari. Pabrik ini beroperasi dengan menggunakan proses kering dengan sebuah kalsiner dan siklon preheater 4 tingkat. Kajian dititikberatkan pada tiga lini proses, yaitu proses raw mill, proses kiln & coal mill, dan proses finish mill. Hasil audit energi menunjukkan bahwa kinerja pada lini proses raw mill masih mendekati harga desain. Sedangkan untuk lini proses kiln & coal mill dan lini proses finish mill, kinerjanya berada di bawah harga desain. Metoda Failure Mode Effect Analysis (FMEA) digunakan untuk menganalisis penyebab tingginya nilai KES dari setiap rangkaian proses. Berdasarkan hasil dari FMEA, rekomendasi diberikan untuk menurunkan KES dan potensi penurunan KES diperkirakan mencapai 14,93 kWh/ton semen.
PENYEDIAAN ENERGI LISTRIK DARURAT DAN PENANGANAN KRISIS AIR BERSIH UNTUK MASYARAKAT TERDAMPAK BANJIR BANDANG DI KABUPATEN PESISIR SELATAN Dendi Adi Saputra M; Devi Chandra; Eka Satria; Adjar Pratoto; Febrin Anas Ismail; Fauzan Fauzan; Abdul Hakam; Bambang Istijono
Jurnal Hilirisasi IPTEKS Vol. 8 No. 2 (2025)
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jhi.v8i2.851

Abstract

The purpose of this community service activity is to assist the recovery of social activities and address the crisis of electricity and clean water following the flash floods in Pesisir Selatan Regency, particularly in Kampung Langgai and Barung-Barung Balantai Health Center, which were the most severely affected areas. The methods employed included conducting a needs assessment survey of the affected communities, procuring and installing a 5.5 kW generator set at Nurul Wahidah Mosque as a social center, distributing ten solar-powered lamps to residents’ homes, and rehabilitating the clean water system at the health center by replacing the water pump and installing new piping networks from the ring well and Pamsimas sources. Additionally, training was provided on the operation and maintenance of electrical equipment, along with socialization on the importance of clean water to prevent post-flood diseases. The results demonstrated a significant improvement in access to electricity and clean water in the affected areas. The mosque resumed its function as a center for social activities, homes and roads received adequate lighting, and health services at the health center became fully operational again. The conclusion of this activity is that appropriate technology-based interventions, such as the provision of generator sets, solar lamps, and water filtration system repairs, are effective in supporting post-disaster recovery and enhancing community resilience. The sustainability of the program can be strengthened through regular training and cross-sector collaboration to build resilient infrastructure in disaster-prone areas.
Model Persamaan Matematik Isoterm Sorpsi untuk Kayu Manis (Cinnamomum burmannii) Habibullah Habibullah; Adjar Pratoto
SAINSTEK Vol. 13 No. 2 (2025)
Publisher : Sekolah Tinggi Teknologi Pekanbaru

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35583/js.v13i2.360

Abstract

Penelitian ini bertujuan untuk mengembangkan model matematik isoterm sorpsi (adsorpsi dan desorpsi) untuk kayu manis (Cinnamomum burmannii) pada suhu 30?±1°C dari data empirik yang diperoleh dengan menggunakan metode gravimetri statis. Kelembapan relatif udara sekeliling diatur dengan menggunakan campuran larutan H?SO? dan akuades dalam rentang kelembapan relatif (RH) atau aktifitas udara antara 16% hingga 98%. Pengujian, kadar air kesetimbangan dilakukan dalam dua arah, yaitu adsorpsi dan desorpsi. Untuk adsorpsi, sampel dikeringkan terlebih dahulu dengan metode oven sebelum dimasukkan ke dalam bejana kedap udara dengan kelembaban udara yang telah dikondisikan. Sedangkan untuk proses desorpsi, sampel direndam dalam akuades terlebih dahulu.. Hubungan antara kadar air kesetimbangan dan kelembapan relatif menunjukkan kurva sigmoid khas tipe II menurut klasifikasi Brunauer. Dalam pemodelan matematik, digunakan lima model isoterm sorpsi, yaitu GAB, Henderson, Oswin, Peleg, dan Smith. Evaluasi fitness model matematik dilakukan dengan menggunakan parameter statistik RMSE, ?², modulus error, dan koefisien determinasi (R²). Hasil menunjukkan bahwa model GAB paling sesuai untuk data adsorpsi, sedangkan model Smith memberikan hasil terbaik untuk desorpsi.
TRANSFORMASI GENERASI MUDA SAWAH LADANG MELALUI INOVASI TEKNOLOGI AIR BERSIH DAN PEMBIBITAN IKAN DI NAGARI MAGEK, SUMATERA BARAT Dendi Adi Saputro; Sabri Haris; Ridwan Ridwan; Eka Satria; Adly Havendry; Adjar Pratoto; Hendery Dahlan; Trisfa Augia
Jurnal ABDI: Media Pengabdian Kepada Masyarakat Vol. 11 No. 2 (2026): JURNAL ABDI : Media Pengabdian Kepada masyarakat
Publisher : Universitas Negeri Surabaya

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

Abstract

Nagari Magek, located in Kamang Magek District, Agam Regency, West Sumatra, faces serious problems related to clean water quality due to the high iron, manganese, and sulfur content. Although a solar-powered borehole system has been built to meet the water needs of 300 households, the water produced is still unfit for consumption. It impacts the decline of fish breeding businesses, one of the essential local traditions in Nagari Magek. To overcome this problem, community service activities aim to design effective clean water treatment technology and assist in fish nurseries and farming. The design process of the multi-level water filter has been carried out as a solution to improve water quality by introducing aeration-sedimentation-filtration technology and the Recirculating Aquaculture System (RAS) system. In addition, the fish nursery business in Nagari Magek is supported by modern pond management training and the empowerment of the younger generation for sustainable management.
Development of an energy management system for palm oil refinery facilities: implementing a systems approach Febrian Febrian; Adjar Pratoto
International Journal of Industrial Optimization Vol. 6 No. 2 (2025)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/ijio.v6i2.13254

Abstract

This study aims to develop a proactive Energy Management System (EnMS) for a palm oil refinery using a comprehensive systems-based approach implemented carefully during the plant design phase. Unlike conventional methods that rely mainly on historical operational data, this research deliberately utilizes engineering design specifications together with simulation modeling to estimate accurate energy consumption baselines and formulate an ISO 50001-compliant EnMS. A regression-based analysis is systematically applied to define reliable Energy Performance Indicators (EnPIs), using production volume and running hours as key variables influencing overall energy utilization. The resulting analytical model estimates a Specific Energy Consumption (SEC) of 2.168 MWh/MT—significantly higher than the 0.45 MWh/MT BAT benchmark—primarily due to assumptions of full-capacity, simultaneous operation under conservative conditions. To support continuous energy performance improvement, the system incorporates PDCA-based review mechanisms and establishes progressive energy-saving targets: an initial 10% reduction, followed by 1–2% annual incremental improvements. Validation through structured feedback sessions from plant management confirmed the system's strong alignment with operational needs, feasibility within industrial contexts, and readiness for phased implementation. Ultimately, this study contributes a novel, simulation-based framework for integrating EnMS during the design stage, offering a scalable and adaptable model for energy-intensive industries that aim to enhance efficiency and achieve long-term sustainability from the outset.
Co-Authors Abdul Hakam Abral, Hairul Adly Havendry Akio Kodama Andoni Prayogi Anwar Kasim Bambang Istijono, Bambang Dendi Adi Saputra M, Dendi Adi Dendi Adi Saputro Devi Chandra Een Tonadi Eka Satria Eka Satria Elisabeth Feberlian Gulo Fauzan . Febrian Febrian Febrin Anas Ismail Gusriwandi Gusriwandi Habibullah Habibullah Hendery Dahlan, Hendery Heroza, Nadry Hery Sunarsono Ismet Hari Mulyadi Jatmiko Edi Siswanto Jody Yudha Pratama MARIA BINTANG Mat Uzir Wahit Melbi Mahardika Melbi Mahardika Mochamad Asrofi Muhammad Fadhil Rahman Muktar, Ridwan Nadry Heroza Nanda, Is Prima Ridwan Muchtar Ridwan Ridwan Sabri Haris Saputra, Agus Dian Trisfa Augia Vitri Aprila Handayani Wulan Herma Sari