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All Journal Rotasi Bulletin of Electrical Engineering and Informatics Rekayasa Mesin Journal of Mathematical and Fundamental Sciences PROSIDING SEMINAR NASIONAL CENDEKIAWAN Prosiding Seminar Nasional Pakar Jurnal Teknik Mesin dan Mekatronika (Journal of Mechanical Engineering and Mechatronics) Indonesian Journal of Computing, Engineering, and Design METAL : Jurnal Sistem Mekanik dan Termal
Lydia Anggraini
President University
Arts Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Transportation

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Journal : Indonesian Journal of Computing, Engineering, and Design

 1 
Performance Optimization of Power Plant Waste Heat Using H2O-LiBr Absorption Refrigerant System Lydia Anggraini; Annisa Nur Wahyuni; Rendi Hernawan; Tetuko Kurniawan
Indonesian Journal of Computing, Engineering, and Design (IJoCED) Vol. 4 No. 1 (2022): IJoCED
Publisher : Faculty of Engineering and Technology, Sampoerna University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (585.782 KB) | DOI: 10.35806/ijoced.v4i1.243

Abstract

This paper examines the use of waste energy in a 3x1 MW Gas Engine Power Plant (GEPP) on Bawean Island, Indonesia. The feasibility method uses water-lithium bromide (H2O-LiBr) technology as absorption refrigeration technology. In addition, bananas are also used for cold storage to overcome waste energy utilization. The cold storage is placed in the 300 m3 area with a 100 kg load capacity for a banana with a temperature of 5oC, 85% humidity, 24 hours of operation, 1292 W cooling load, and 371 TR. This system is used because it utilizes a cheap energy source that dissipates heat from gas and has no ecological hazards, such as ozone layer depletion and global warming. The exhaust gas temperature is 500oC. Moreover, cooling loads for cold storage, which are used with thermodynamic models, and consistent fluid properties, performance, and size of cold storage were also investigated. The results obtained show that higher cold storage output comes from internal factors as compared to external factors. In addition, the absorption refrigerant with Tevaporation is 5oC, capacity 403 TR and Qabsorption is 984 kW, Qgenerator is 1066 kW, Qevaporation is 1411 kW, Qcondenser is 1493 kW, with an absorption coefficient of performance (COP) of 1.32 and power consumption of 158,25 kW. Furthermore, after calculations, analysis, and field experiments, it shows that the internal factor of the cooling load is higher than the external factor sourced from bananas in the cold storage. This phenomenon occurs probably due to the product being refrigerated, following the soar cooling capacity. Thus, the waste energy in PLTGU 3x1 MW has tried to be utilized by the refrigerant absorption system.
Impact Behavior of Multi-Layered UHMWPE Vests Reinforced with Titanium and PVC for Ballistic Protection Muzhaffar Effendi, Nabil; Sastranegara, Azhari; Hernawan, Rendi; Anggraini, Lydia
Indonesian Journal of Computing, Engineering, and Design (IJoCED) Vol. 7 No. 1 (2025): IJoCED
Publisher : Faculty of Engineering and Technology, Sampoerna University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35806/ijoced.v7i1.504

Abstract

Achieving lightweight and high-performance bulletproof vests is essential for military and law enforcement, where balancing mobility and ballistic resistance is critical. This study investigates the ballistic performance of multi-layered Ultra-High Molecular Weight Polyethylene (UHMWPE) vests reinforced with titanium (Ti6Al4V) and polyvinyl chloride (PVC). Two innovative vest configurations were evaluated following National Institute of Justice (NIJ) Standard-0101.04 ballistics tests and simulated using the Finite Element Method (FEM). Experimental findings indicated that while Vest 1 significantly absorbed impact energy, it failed to prevent projectile penetration. In contrast, Vest 2, incorporating additional titanium and polymer layers, effectively mitigated the penetration of 9 mm Full Metal Jacket (FMJ) projectiles while maintaining a safe back-face signature (BFS). The FEM simulation results demonstrated strong agreement with the experimental data, validating the effectiveness of multi-material layering in enhancing ballistic resistance. This research presents a strategic integration of titanium and polymer composites designed to achieve superior ballistic resistance while maintaining lightweight properties. These findings provide valuable insights for developing advanced body armor designs suitable for high-performance military and law enforcement applications.
Co-Authors Abdullah, Salman Faruqi Akhir, Yaummil Chairil Agoest Annisa Nur Wahyuni Annisa Nur Wahyuni Aprilia Putri Laurina Ardhi Bebi Laksono Asep Suhandi Haris Cahyo Triatmono Haryo Bisono Setyadi Hendra Jaya Tarigan Hernawan, Rendi Ida Bagus Madra Gana Ivan Junixsen Joni Welman Simatupang Lutfi Fadilah Muslimin Muslimin Muzhaffar Effendi, Nabil Naoki Matsuzuka Norbertus Krisna Aditya Utomo Putra, Bobby Salim Rendi Hernawan Sastranegara, Azhari Sugeng Sugeng Sutisna, Nanang Ali Tetuko Kurniawan Timotius, Hizkia Tirta Kumala Yoshitada Isono Zairullah Azhar