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All Journal Jurnal Pembangunan Wilayah dan Kota SPEKTRUM INDUSTRI OPSI Tekinfo | Scientific Journal of Industrial and Information Engineering Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Jurnal Teknologi Pangan dan Hasil Pertanian Jurnal Sains dan Teknologi Dharma: Jurnal Pengabdian Masyarakat Indonesian Journal of Community Empowerment
Puryani .
Jurusan Teknik Industri, Fakultas Teknik Industri Universitas Pembangunan Nasional ”Veteran” Yogyakarta
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Journal : OPSI

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Investment analysis of solar power plant installation on the roof of the central business district office building with the best investment value Soejanto, Irwan; Poerbaningrat, Raden Muhammad Nalindra; Ristyowati, Trismi; Puryani, Puryani
OPSI Vol 17 No 1 (2024): ISSN 1693-2102
Publisher : Jurusan Teknik Industri, Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v17i1.11233

Abstract

The Central Business District (CBD) office building is making efforts to reduce building electricity costs, and one alternative is solar power plant installation. PT. Rancang Prima Sejahtera, engaged in the solar energy industry, conducts consulting services with Central Business District office buildings, so PT. Rancang Prima Sejahtera made an indicative proposal with several solar power plant installation scenarios to be installed on the roof of the Central Business District office building. Four scenarios are created from the combination of 2 PV modules and two inverters. Each scenario created will be assessed for the level of opt, and the investment value will be calculated. In combining components using the principles of the Vereun Deutsche Ingineuer (VDI) 2222 method and assessed each scenario using six aspects of assessment.Meanwhile, the investment analysis assessment uses the parameters of Cost of Energy (CoE), Net Present Value (NPV), Internal Rate of Return (IRR), Benefit-Cost Ratio (B-CR), and discounted payback period. The results of the analysis conducted found that the third scenario was the best scenario with a percentage of the design value of 82.5%, CoE value of Rp398.31/kWh, NPV value of Rp2,451,719,005, IRR percentage of 23.75%, B-CR value of 7.8, and DPP value for 6.8 years with a project life of 30 years. The findings of the investment research indicate that the implementation of solar power plant installations in office buildings located in Central Business Districts yields long-term cost reductions in electricity expenses over a 30-year period, as opposed to relying solely on the services provided by the State Electricity Enterprise.
Improving the job shop scheduling algorithm to minimize total penalty costs considering maintenance activity Puryani, Puryani; Chalida, Nurmalia; Soepardi, Apriani; Chaeron, Mochammad; Nafisah, Laila
OPSI Vol 17 No 2 (2024): ISSN 1693-2102
Publisher : Jurusan Teknik Industri, Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v17i2.12291

Abstract

Production scheduling is generally based on the assumption that resources are always available. In reality, these resources, machines, and supporting facilities experience limited availability due to interruptions during the production process. Therefore, to improve these conditions, the maintenance process conducted to reduce the disruption level of the machine needs to be scheduled as part of the available for job processing leading to penalty costs, such as tardiness and earliness. This research aims to develop a new algorithm to solve job shop scheduling problems to minimize the total penalty cost by considering machine unavailability due to scheduled maintenance activities. The proposed model modifies the existing model using a combination of priority rules and a heuristic approach algorithm known as priority dispatching. The result showed that the proposed model produces a greater total cost with a larger flow time than the previous model. Although the flow time is larger, it is more realistic according to real conditions because the proposed model considers machine maintenance activities. Furthermore, the combination of priority rules used also affected the flow time and the total penalty costs incurred, which can be minimized through several alternatives.
Co-Authors A. Soepardi Algary, Tissia Ayu Apriani Soepardi Apriani Soepardi Apriani Soepardi Chaeron, M. Chaeron, Mochamad Chalida, Nurmalia Chodijayanti, Ary Damat, Damat Deni Widiyanto Desy Rahmawati Dian Hudawan Santoso Dwi Setyo Muyatno Hasanah, Khuswatun Hilmi, Ichlasul Kevin Intan Berlianty Intan Berlianty Irwan Soejanto Isti Anggraini Isti Anggraini Laila Nafisah M. Chaeron Moch. Chaeron Mochammad Chaeron Mochammad Chaeron Mohammad Chaeron Muhammad Isnaini Rozaq Muhammad Shodiq Abdul Kanan Nandari, Wibiana Wulan Nuansa Indriya Pramasthi NUR KUMALA SARI Nursubiyantoro, Eko P.L. Puspita Poerbaningrat, Raden Muhammad Nalindra Pradeas Ridiasa Praja, Siti Aqilla Sayyidha Winata Purwanto Purwanto Puspita, P.L. Rista Anggriani Sadi Sadi Sally, Wellem Salsabila, Andalusia Trisna Soepardi, A. Solly Aryza Sutrisno Sutrisno Trismi Ristyowati Trismi Ristyowati Vertha Fuji Rizky Syafriani Wardhani, Rike Maya Wawan K Risal Wellem Sally Yuli Dwi Astanti