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All Journal Faraday: Journal of Fundamental Physics, Research, and Applied Science
Setiawan, Yofinda Eka
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Computer Science & IT Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Rooftop PV System Optimization in an Educational Building Using SAM: A Case Study at UPN Veteran Jawa Timur Setiawan, Yofinda Eka; Hilmi, Allif Rosyidy
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 1 No. 2 (2025): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v1i2.17

Abstract

The implementation of sustanable energy in educational institutions recognizes the potential of rooftop photovoltaic (PV) systems as a viable energy source. This research aims to evaluate and optimize the design of a rooftop photovoltaic (PV) system for Building 1 of the Fakultas Teknik dan Sains (FTS) at Universitas Pembangunan Nasional "Veteran" Jawa Timur (UPNVJT) using the System Advisor Model (SAM) software. Integrated data including meteorological data, building characteristics, and solar panel system specifications were utilized. The available rooftop area for PV system installation is approximately 200 m² with a north-facing orientation, which is estimated to accommodate a 30 kWp PV system capacity. Tilt angle and azimuth scenarios were varied to achieve maximum energy production. Based on SAM simulations, the optimal installation angle of 15° tilt and azimuth generated an annual energy output of 44,052 kWh with a performance ratio of 71% and a capacity factor of 17%. This study confirms that rooftop PV installation at FTS UPNVJT is technically feasible, and it is expected to serve as a foundation for the gradual implementation of PV systems as part of green campus initiatives and energy transition in educational institutions.
Optical Band Gap of PMMA: Cody, ASF, and DASF Methods Compared to Tauc Hilmi, Allif Rosyidy Hilmi; Setiawan, Yofinda Eka; Hasan, Nailul
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 2 No. 1 (2026): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

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Abstract

This study aimed to determine the optical band gap of polymethyl methacrylate (PMMA) using alternative methods to the conventional Tauc plot. PMMA was prepared by solution casting and characterized using UV–Vis spectroscopy. The optical band gap was approximated by applying the Cody, Absorption Spectrum Fitting (ASF), and Derivative ASF (DASF) methods, and the results were compared with those from the Tauc approach. The optical band gap values ranged from 3.10 eV to 4.94 eV, which fall within or near the range reported in the literature for PMMA, depending on the analysis method and transition model used. Each method had distinct advantages: the Cody method provided a clearer linear region for amorphous systems, ASF offered a practical approach that did not require sample-thickness information, and DASF enhanced precision through derivative-based analysis. The observation of band gap values corresponding to both direct and indirect optical transitions suggests the presence of multiple effective optical transition pathways in amorphous PMMA. These findings demonstrate that the Cody, ASF, and DASF methods can serve as reliable alternatives to the Tauc method for analyzing the optical properties of polymeric materials.
Co-Authors Hasan, Nailul Hilmi, Allif Rosyidy Hilmi, Allif Rosyidy Hilmi