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All Journal Journal of Electrical Technology Jurnal Rekayasa Material, Manufaktur & Energi Jurnal Surya Teknika Jurnal MESIL (Mesin Elektro Sipil) International Journal of Research in Vocational Studies (IJRVOCAS) Jurnal Polimesin Journal of Telecommunication and Electrical Scientific Journal of Innovation and Community Engagement
Irfan Nofri
Universitas Muhammadiyah Sumatera Utara
Aerospace Engineering Arts Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Optimasi Kapasitas PLTS Berdasarkan Ketersediaan Lahan Rooftop Menggunakan Helioscope Nofri, Irfan; Rohana, Rohana; Lubis, Sudirman; Nasution, Sawirman
SURYA TEKNIKA Vol 13 No 1 (2026): JURNAL SURYA TEKNIKA
Publisher : Fakultas Teknik UMRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37859/jst.v13i1.11472

Abstract

The increasing demand for electrical energy in buildings requires the utilization of renewable energy as an alternative power source. One of the applicable solutions is the implementation of rooftop photovoltaic (PV) systems. This study aims to optimize the rooftop PV system capacity based on the available installation area at the BKD Building of Tebing Tinggi City using Helioscope software. The research method was carried out through building electrical load data collection, electrical energy requirement analysis, PV system capacity calculation, installation area requirement analysis, rooftop simulation using Helioscope software, and simple economic analysis. The results showed that the total electrical energy demand of the building was 304,212 Wh/day, with motor loads dominating energy consumption by 91% of the total electrical usage. The required PV system capacity to supply the entire building load was 82.393 kWp with a required installation area of 552.08 m². Based on the Helioscope simulation results, the available effective rooftop area was only 346.8 m², indicating that the PV system for supplying the entire building load was not feasible to implement. The optimization results showed that the most optimal PV configuration was supplying electronic and lighting loads with a capacity of 7,777.15 Wp using 79 solar modules and requiring an installation area of 52.93 m². The economic analysis indicated that the proposed PV system has a simple payback period of approximately 11 years, demonstrating its feasibility for long-term implementation in government buildings. This study demonstrates that rooftop validation using Helioscope software is essential to produce a realistic rooftop PV design that matches actual building conditions.
Comparative evaluation of post-weld heat treatment (PWHT) temperature effects on GMAW-welded SS400 and AISI 1045 Steels Rafsanzani Pane; Sudirman Lubis; Benny Oktrialdi; Sawirman Sawirman; Irfan Nofri
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.8885

Abstract

Post-weld heat treatment (PWHT) can modify the microstructure and mechanical properties of welded steels through recovery, recrystallization, and grain growth. This study investigated the effect of PWHT temperature on the mechanical properties and microstructure of SS400 and AISI 1045 steels welded using the gas metal arc welding (GMAW) process. The welded joints were prepared using a single-V groove configuration with a constant welding current of 130 A, ER70S-6 filler metal, and CO₂ shielding gas. After welding, SS400 specimens were subjected to PWHT at 400, 500, and 600 °C, while AISI 1045 specimens were treated at 600, 700, and 800 °C, followed by furnace cooling. Vickers hardness was measured across the base metal, heat-affected zone, and weld metal, while tensile testing was performed on AISI 1045 and SS400 specimens in accordance with ASTM standards. Microstructures were examined using optical microscopy. For SS400, PWHT at 500 °C produced the most favorable hardness response and a more homogeneous ferrite–pearlite microstructure, whereas treatment at 600 °C reduced hardness, consistent with grain coarsening. For AISI 1045, tensile strength decreased with increasing PWHT temperature, while hardness showed an increasing tendency. The highest tensile strength was obtained at 600 °C, whereas higher temperatures promoted microstructural coarsening. These results indicate that PWHT temperature strongly influences the mechanical and microstructural response of GMAW-welded steels and should be selected according to the material and required mechanical properties.
Co-Authors abdul azis Abdul Azis Hutasuhut Abdul Aziz Abdullah Adam Pangestu Affandi . Ahmad Marabdi Siregar Aminah Asmara Dewi Benny Oktrialdi C Cholish Cholis Cholish Cholish Efrida, Rizki fadlan fadlan Fahrul Roji Faisal Irsan Pasaribu Hardi, Surya Iqbal Tanjung Irwansyah Putra Lubis, Riadini Wanty Muhammad Husin Gultom Muharnif M Nasution, Sawirman Pardede, Sutan Partaonan Harahap R Rohana Rafsanzani Pane Rafsanzani Pane ROHANA ROHANA Salman, Aulia sawirman Sawirman Sawirman Sawirman Siregar, Chandra A Sitepu, Trahman Sudirman Lubis Sudirman Lubis Suparmono Suprianto Tanjung, Iqbal Zarina Binti Ismail