Article Per Year (5 Year)
p-Index From 2020 - 2025
1.405
P-Index
This Author published in this journals
All Journal SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Jurnal Rekayasa Material, Manufaktur & Energi RELE: Rekayasa Elektrikal dan Energi Jurnal Teknik Elektro Scientific Journal of Reflection : Economic, Accounting, Management and Business Jurnal Pendidikan Vokasi Otomotif
Siregar, Chandra A
Unknown Affiliation
Aerospace Engineering Humanities Automotive Engineering Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

Published : 8 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 8 Documents
Search

 1 
Investigasi Peleburan dan Pembekuan Phasa Change Material (PCM) Paraffin Wax Sebagai Thermal Energy Storage Pada Pipa Handoko, R; Suwandi, A; Siregar, Chandra A; Siregar, Ahmad Marabdi
Rekayasa Material, Manufaktur dan Energi Vol 6, No 2: September 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i2.16336

Abstract

Phase change materials (PCM) are materials that can change phase from solid to liquid and vice versa from water to solid. PCM is the most efficient material for storing heat energy in the form of latent heat. This study aims to investigate melting and freezing of PCM types of paraffin wax in pipes. The investigation was carried out in 3 experiments with heat source temperatures of 90 0C, 85 0C and 80 0C. To facilitate investigation, paraffin wax is placed in a transparent tube. During the smelting process, observations were made for 600 minutes, and data recording and shooting were carried out every 60 minutes. The result is that the melting of paraffin wax starts from the top of the heat source side. The higher temperature paraffin wax moves upwards and the lower one moves downwards. On freezing, also found the same thing. The flow pattern is affected by the temperature of the paraffin wax itself. In addition, it can also be concluded that the higher the temperature of paraffin wax, the higher its ability to store heat energy.
PERANCANGAN PLTS ON-GRID BERBASIS MICRO INVERTER 500 WATT Harahap, Partaonan; Rimbawati, Rimbawati; Siregar, Chandra A
-
Publisher : RELE (Rekayasa Elektrikal dan Energi) : Jurnal Teknik Elektro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rele.v6i2.17688

Abstract

Sistem on-grid ialah rangkaian fotovoltaik yang cuma menciptakan energi kala jaringan energi utilitas (PLN) ada Sistem ini wajib tersambung ke grid supaya berperan Sistem ini bisa mengirim kelebihan energi yang dihasilkan kembali ke jaringan kala sel surya memproduksi energi berlebih sehingga terdapat surplus buat digunakan nanti. PLTS On-Grid ini senantiasa tersambung dengan Jaringan Listrik Universal serta memaksimalkan tenaga dari panel surya buat menciptakan tenaga listrik secara optimal Tenaga yang dihasilkan dari matahari secara langsung disalurkan ke beban yang tersambung ke jaringan, sehingga bisa dikatakan sistem On-Grid ini sanggup memaksimalkan pemakaian tenaga matahari, dengan tujuan kurangi tagihan listrik. Hasil pengukuran, perhitungan serta analisa informasi yang sudah dicoba kalau model PLTS on grid berbasis micro inverter ini sudah berperan dengan baik, sanggup membangkitkan energi listrik, sanggup menyalurkan listrik ke beban serta pula sanggup menyalurkan energi listrik ke jaringan PLN, sehingga model ini siap buat dipakai selaku materi praktek serta pula selaku perlengkapan promosi PLTS on-grid kepada warga Dari hari ke 5 pengukuran yang dicoba hingga energi rata-rata keselurahan dengan energi beban sebesar 104.5 Watt, di posisi PLTS sebsar 53.8 Watt serta pada posisi posisi PLN sebesar 72.4 Watt. 
Pengaruh sudut twist drill terdahap kekasaran dan kebulatan pada proses pemesinan drilling Nasution, Arya Rudi; Wahyudi, Fauzi S; Siregar, Chandra A; Affandi, Affandi; Fuadi, Zahrul
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol 17, No 1 (2023): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.17.1.1-6

Abstract

Coolant and twist drill angle is one of the factors that affect the quality of the workpiece. Coolant selection and twist drill angle are useful for reducing hole roughness and increasing drill hole precision. In addition, the coolant must be easily degraded in the environment so that the environment is not polluted. An example of coconut oil is oil that can be degraded in the environment. This study aims to determine the effect of coconut oil (CO) and drill bit angle on the hole and hole precision obtained during the drilling process. In experimental testing, conventional drilling machines are used for test testing. the tests were carried out under various machining parameters, namely spindle rotation speed of 1100 rpm, drill bit angles of 130° and 135°. Based on these parameters, the spindle rotation speed of 1100 rpm and the drill bit angle of 135° is rougher than the drilling results for the spindle rotation speed of 1100 rpm and the drill bit angle of 130°. In addition, the roundness of the drilled holes for a spindle rotational speed of 1100 rpm and a drill bit angle of 130° is more precise than the spindle rotation speed of 1100 rpm and a drill bit angle of 135°.
Sistem Pembangkit Listrik Tenaga Surya (PLTS) menggunakan Teknologi Maximum Power Point Tracking (MPPT) dan Zeta Converter HARAHAP, PARTAONAN; RITONGA, RAHMAT; RIMBAWATI, RIMBAWATI; OKTRIALDI, BENNY; SIREGAR, MUNAWAR ALFANSURY; LUBIS, SUDIRMAN; SIREGAR, CHANDRA A
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 12, No 2: Published April 2024
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v12i2.405

Abstract

ABSTRAKSistem kendali MPPT hendak mengendalikan penciptaan serta penyimpanan energi sistem PV menggunakan DC-DC boost converter. Perancangan dan pembuatan alat zeta converter berhasil dilakukan dengan menggunakan mikrokontroller arduino untuk menaikkan tingkat effisiensi daya keluaran pada PLTS berhasil dilakukan dengan baik. Keluaran tegangan serta arus yang dihasilkan oleh MPPT dengan memakai zeta converter relatif efektif dan effisien dibuktikan dengan daya keluaran PLTS yang memiliki tingkat effisiensi yang stabil setiap pengambilan data, dan tingkat effisiensi yang dihasilkan juga relatif tinggi yaitu 92%. Perhitungan yang dilakukan adalah dengan cara mengambil data arus dan tegangan pada MPPT tanpa zeta converter dan dengan zeta converter yang telah dihitung melalui perhitungan duty cycle. Adapun nilai duty cycle yang dihasilkan adalah 0,243 atau 24% dan arus input maximal yang dihasilkan setelah perhitungan adalah 5,34 Ampere.Kata Kunci: PLTS, MPPT, Zeta Converter, Arduino ABSTRACTUsing a DC-DC boost converter, the MPPT management system will manage the generation and storage of PV system energy. The zeta converter was designed and manufactured successfully utilizing an Arduino microcontroller to boost the efficiency level of output power in PLTS. The voltage and current output produced by MPPT utilizing a zeta converter is relatively effective and efficient. The voltage and current output produced by MPPT using a zeta converter is relatively effective and efficient, as proven by the PLTS output power which has a stable efficiency level every time data is taken, and the resulting efficiency level is also relatively high, namely 92%. The calculations carried out are by taking current and voltage data on the MPPT without a zeta converter and with a zeta converter which has been calculated through duty cycle calculations. Meanwhile, the resulting duty cycle value is 0.243 or 24% and the maximum input current produced after calculation is 5.34 Amperes.Keywords: PLTS, MPPT, Zeta Converter, Arduino
Experimental Analysis of Climate Parameters Effect on Structural Steel Atmospheric Corrosion Rate in Medan City Environment Tanjung, Iqbal; Lubis, Riadini Wanty; Gultom, Zuli Agustina; Affandi, Affandi; Siregar, Chandra A; Fonna, Syarizal
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 18 No. 2 (2024): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.18.2.135-143

Abstract

This study aims to explore the important role of weather parameters i.e. humidity, rainfall, temperature, and wind speed on the corrosion rate in the Medan City atmospheric environment. Three forms of material with low carbon steel type were prepared in this investigation. The exploration process was conducted for six months starting from June to December 2023, in the open area of the Engineering Faculty, Universitas Muhammadiyah Sumatera Utara. Corrosion rate assessment is carried out monthly using the weight loss method and climate parameter data is obtained from the Medan City Meteorology and Geophysics Agency (BMKG). The dimensions, initial preparation, data collection, post-test material preparation, and corrosion rate calculations refer to the ASTM G1 and G50 standards. Regression analysis and Pearson correlation explain the relationship between corrosion rate and climate parameters. The investigation showed that the corrosion rate fluctuated monthly from 0.1 to 0.5 mpy. By referring to corrosion resistance data on metal materials, it was found that the corrosion level was in the good resistance category "outstanding". Based on the regression analysis results, humidity, local temperature, and rainfall play an important role in the atmospheric corrosion rate in Medan City. The percentage of closeness between variables is ± 98% and the standard deviation is ± 0.0001. Further development is needed to determine other parameters that also play an important role in atmospheric corrosion rate and forming a random forest model for predicting future corrosion rates.
Karakteristik Gugus Fungsi dan Kekuatan Impak Material Komposit Berpenguat Serat Serbuk Daun Nanas Tanjung, Iqbal; Lubis, Riadini Wanty; Nofri, Irfan; ., Affandi; Siregar, Chandra A; Siregar, Ahmad Marabdi; Efrida, Rizki
Rekayasa Material, Manufaktur dan Energi Vol 8, No 2: JULI 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i2.25533

Abstract

The objective of this study is to investigate the impact strength and functional group characteristics, as identified through FTIR spectroscopy, of composite materials reinforced with pineapple leaf powder fibers that have undergone physical property enhancement via alkali treatment (NaOH). A series of processes were conducted to produce the pineapple leaf powder, starting with drying fresh pineapple leaves until they turned brown. The dried leaves were then cleaned and soaked in a 5% NaOH solution for durations of 1, 3, 5, 7, and 9 hours to modify their physical properties. After treatment, the leaves were rinsed thoroughly and oven-dried at 60°C for 5 hours. The dried leaves were subsequently ground and sieved using a 150-mesh screen. This study involved two main observations: functional group analysis using FTIR spectroscopy and mechanical performance evaluation through impact testing. A total of 30 composite specimens were prepared and fabricated using a stepwise lamination method, following the ASTM D256 impact testing standard. The results indicate that alkali treatment progressively degraded the hemicellulose and lignin content in the pineapple leaf fibers, significantly enhancing the impact energy absorption of the composite material. However, extended treatment durations adversely affected the fiber quality, leading to structural damage and reduced interfacial cohesion between the composite components.
Utilization and Experimental Use of Stainless Steel Metal Scrap Machinery Waste, St-40 Iron, Copper and Aluminum to Reduce Co, Hc, Co2 Elements in Vehicle Exhaust Siregar, Ahmad Marabdi; Siregar, Chandra A; Umurani, Khairul
Jurnal Pendidikan Vokasi Otomotif Vol. 6 No. 2 (2024): (Mei)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jpvo.v6i2.73269

Abstract

Air pollution due to motor vehicle exhaust emissions is increased. Polluted air harms human health dan the environment. Consequently, it is essential to make a sustained effort to reduce air pollution. The purpose of this research is to investigate the effect of adding aluminum scrap to the exhaust system of a motor vehicle on gas emissions composition. The motor vehicle exhaust system was modified to accommodate aluminum scrap placement. A gas analyzer was utilized to observe exhaust gas composition, such as carbon dioxide, hydrocarbon, and carbon monoxide.  Aluminum scrap with different masses was wrapped around the exhaust's inner tube in 50 gr, 70 gr and 90 gr. The engine speed was maintained at 500 rpm throughout the testing process. It was found that the temperature of the outer exhaust tube is in a range of 40 degrees Celsius to 50 degrees Celsius. The results revealed that the most appropriate amount of aluminum scrap was 90 gr n to reduce carbon monoxide, hydrocarbon, and carbon dioxide in an exhausts gas. The surprising outcome was 76.78 % of carbon monoxide content declined, and furthermore hydrocarbon, and carbon dioxide content were deteriorated by 61.63% and 78.37%, respectively.
Pembangunan Spot Foto sebagai Daya Tarik di Danau Kaolin Bangka Belitung Herliansyah, Dwi; Siregar, Chandra A
SCIENTIFIC JOURNAL OF REFLECTION : Economic, Accounting, Management and Business Vol. 8 No. 4 (2025): SCIENTIFIC JOURNAL OF REFLECTION: Economic, Accounting, Management, & Business
Publisher : Sekolah Menengah Kejuruan (SMK) Pustek

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37481/sjr.v8i4.1279

Abstract

Kaolin Lake in Bangka Belitung, a former mining site, has transformed into a popular tourist destination due to its striking blue waters and white sandy mounds. The unique landscape offers strong visual appeal, particularly for younger generations seeking photogenic and shareable experiences on platforms like Instagram and TikTok. This study explores the development of photo spots as a key strategy to enhance the lake’s attractiveness and support sustainable tourism growth. The purpose of the research is to analyze how the creation of aesthetically designed photo spots contributes to visitor satisfaction, destination branding, and the local economy. A qualitative descriptive method was used, involving field observations, interviews with local stakeholders, and documentation analysis. The results show that the presence of thematic and creatively designed photo spots significantly increases visitor engagement and length of stay. Furthermore, these developments encourage local entrepreneurship and community participation. However, maintaining environmental sustainability and ensuring the authenticity of the natural landscape remain critical challenges. This study highlights the importance of integrating visual tourism trends with sustainable planning to develop competitive and responsible tourist attractions. The findings contribute to broader discussions on innovation in destination development, especially in post-mining areas.
Co-Authors Affandi Affandi . Affandi Affandi Ahmad Marabdi Siregar Arya Rudi Nasution Benny Oktrialdi Efrida, Rizki Fonna, Syarizal Handoko, R Harahap, Partaonan Herliansyah, Dwi Irfan Nofri Lubis, Riadini Wanty Rimbawati RITONGA, RAHMAT Siregar, Munawar Alfansury Sudirman Lubis Suwandi, A Tanjung, Iqbal Umurani, Khairul Wahyudi, Fauzi S Zahrul Fuadi Zuli Agustina Gultom