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All Journal Otopro Journal of Innovative and Creativity
Adinda Rahmah Shalihah
Polytechnic STMI Jakarta
Automotive Engineering Education Energy Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences Other

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Recent Advances and Challenges of Small-Capacity Air-Cooled Solar-Assisted Ammonia Absorption Chillers in Tropical Regions Desy Agung; Siti Astari Pratiwi; Adinda Rahmah Shalihah
Journal of Innovative and Creativity Vol. 6 No. 1 (2026)
Publisher : Fakultas Ilmu Pendidikan Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/joecy.v6i1.8232

Abstract

The rapidly increasing demand for air conditioning has intensified energy consumption, environmental impacts, and water use associated with conventional vapor compression cooling systems. Solar-powered absorption chillers offer a low-carbon alternative by utilizing renewable thermal energy and environmentally friendly working fluids. This paper presents a literature review on the development of solar-powered absorption chiller systems, with a focus on small-capacity, air-cooled chillers using ammonia as the working fluid. The review is structured chronologically, covering early feasibility studies through performance improvement, compact system design, and adaptation to hot and tropical climates. Compared to water-cooled systems, air-cooled configurations eliminate the use of cooling towers, thereby reducing water consumption and enabling simpler system designs, although they face challenges in heat rejection under high ambient temperatures. Ammonia–water systems show strong potential due to their high temperature tolerance, zero Global Warming Potential, and suitability for air-cooled operation. This review identifies key technological advances, major limitations, and important research gaps, particularly for applications in tropical regions such as Indonesia.
EVALUATION OF INJECTION MOLDING PROCESS PARAMETERS ON THE QUALITY OF BRAKE FLUID RESERVOIR CAP PRODUCTS USING MOLDFLOW SIMULATION Adinda Rahmah Shalihah; Aditya Bagja Subarkah; Farras Novyansyah; Irfan Fadillah; Ammar Fathi Muhadzab; Hafizh Maulana Alfath; Ulima Adristi Azis; Hikari Qurrata’ain Nurhadi
Otopro Vol 21 No 2 May 2026
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/otopro.v21n2.p78-84

Abstract

This study aims to analyze the effect of melt temperature and mold surface temperature variations on the quality of the motorcycle brake fluid reservoir cap using Autodesk Fusion simulation. Three parameter variations were applied: 260°C/80°C, 220°C/50°C, and 180°C/20°C, while other process parameters were kept constant. The evaluation focused on fill confidence, weld lines, sink marks, and warpage. The results show that all conditions achieved 100% fill confidence with a filling time of 0.53 seconds. However, higher temperatures reduced weld lines but increased sink marks and warpage. Conversely, lower temperatures minimized deformation but increased the number of visual defects. The medium temperature condition provided the best balance between visual quality and dimensional stability. Therefore, the 220°C/50°C condition is recommended as optimal
Co-Authors Aditya Bagja Subarkah Ammar Fathi Muhadzab Desy Agung Farras Novyansyah Hafizh Maulana Alfath Hikari Qurrata’ain Nurhadi Irfan Fadillah Siti Astari Pratiwi Ulima Adristi Azis