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All Journal ASEAN Journal of Systems Engineering Jurnal Teknoin Jurnal Spektra Journal of Mechanical Engineering Science and Technology Journal of Engineering and Applied Technology Journal of Mechanical Design and Testing (JMDT) International Journal of Renewable Energy Development
Adhika Widyaparaga
Departemen Teknik Mesin Dan Industri, Fakultas Teknik, Universitas Gadjah Mada. Jl. Grafika No.2, Kompleks UGM, Yogyakarta 55281, Indonesia
Automotive Engineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Electric Vehicle Battery and Motor Sizing for Yogyakarta Tourism Spots Miasa, I Made; Widyaparaga, Adhika; Sucipto, Sucipto
Journal of Mechanical Design and Testing Vol 7, No 1 (2025): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.105334

Abstract

Pertumbuhan pariwisata di Daerah Istimewa Yogyakarta telah mendorong kebutuhan terhadap transportasi ramah lingkungan. Kendaraan listrik (EV) menjadi solusi untuk mengurangi emisi karbon dan meningkatkan kenyamanan wisatawan. Studi ini dilakukan untuk menentukan spesifikasi optimal EV untuk rute tujuan wisata lokal di Provinsi Yogyakarta melalui survei lapangan dan preferensi wisatawan. Analisis mencakup perhitungan daya dan torsi motor listrik berdasarkan hambatan gerak serta kebutuhan energi untuk menentukan kapasitas baterai optimal dalam dua skenario: tanpa dan dengan stasiun pengisian daya. Hasil kajian menunjukkan bahwa rute wisata di Mangunan, dengan elevasi signifikan, memerlukan daya lebih besar dibandingkan rute datar seperti Kraton–Gumuk Pasir. Kapasitas baterai bervariasi tergantung skenario pengisian, mempertimbangkan konsumsi daya motor, pendingin udara, dan sistem keselamatan. Studi ini memberikan dasar untuk pengembangan EV wisata berkelanjutan di Yogyakarta.
Boiling Heat Transfer Coefficient and Critical Heat Flux on Conical Cylindrical Copper under Surface Modification Nashrullah, Muhammad Dimyati; Sanata, Andi; Solahuddin, Imam; Ilminnafik, Nasrul; Pranoto, Indro; Widyaparaga, Adhika
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p126

Abstract

This study examined how surface roughness and nanoceramic coating, influences the boiling heat transfer coefficient (BHTC) and critical heat flux (CHF) of a conical cylindrical copper test specimen. Three test specimens exhibiting surface roughness of 0.22 µm, 0.14 µm, and 0.04 µm were analyzed for comparison. Two additional test specimens were treated with nanoceramic coatings utilizing silicon carbide as the base material: one specimen received a single-layer coating and the second was applied with a double-layer coating. The behavior of the bubbles was closely observed with a high-speed camera to deepen the analysis. The experimental results showed that the test specimen with higher surface roughness exhibited higher BHTC and CHF. The 0.22 µm surface roughness specimen demonstrated a 55.69% greater BHTC than the 0.04 µm surface roughness specimen. In contrast, the 0.04 µm surface roughness specimen had the lowest CHF, 426.09 kW/m². Nanoceramic coating also enhanced the BHTC and CHF. The specimen with a single-layer coating had the highest BHTC, 40.81% higher than the uncoated specimen. The specimen with a double-layer coating showed a 60.12% increase in CHF compared to the specimen with a single-layer coating. The bubble observation results indicated that test specimens with higher BHTC and CHF had more active nucleation sites. The quantity of active nucleation sites plays a vital role in producing a large number of bubbles, enhancing heat transfer, and maintaining the surface temperature.
Co-Authors Abrar Ridwan Agung Bambang Setio Utomo Agung Bambang Setio Utomo Ahmad Agus Setiawan Alim Yuandia Andi Sanata Ari Iman Santosa Astuti, Wijayanti Dwi Biwa, Tetsushi Chatarina Umbul Wahyuni Erik Rekayana Fauzun Fauzun Febrinawarta, Burhan Hery Mada Indra Paska I Made Miasa Ikhsan Setiawan Ikhsan Setiawan Indro Pranoto Irfan Aditya Dharma Makoto Nohtomi Makoto Nohtomi, Makoto Muhammad Agus Muljanto Muhammad Dimyati Nashrullah Nasrul Ilminnafik Pandu Prabowo Jati PH, Hendro Prakarso, Hendro Prastowo Murti Prastowo Murti, Prastowo Premiaji, Witnadi Dardjat Ridwan Abdurrahman Rosafira, Jihan Zeinyuta Solahuddin, Imam