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All Journal Journal of Mechanical Engineering Education (Jurnal Pendidikan Teknik Mesin) International Journal of Innovation in Mechanical Engineering and Advanced Materials
Aulia, Irham
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Automotive Engineering Education Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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Students' Perception of the Implementation of Online Learning on Air Conditioning Engineering Course Aulia, Irham; Rohendi, Dedi; Berman, Ega Taqwali; Wiyono, Apri
Journal of Mechanical Engineering Education Vol 7, No 2 (2020): Desember 2020
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/jmee.v7i2.28116

Abstract

The purpose of this study was to find out how students’ perceptions of online learning in terms of learning facilities, the ability of lecturer and students, as well as their learning activities. This research uses descriptive quantitative method. The data collection technique used in this research is a closed questionnaire filled out by Competency-Based Curriculum Refrigeration and Air Conditioning Engineering, Department of Mechanical Engineering Education, Universitas Pendidikan Indonesia students who contracted the Air Conditioning Engineering course, the sample was the entire population of the study. The results of this study indicate that students have good online learning facilities, students and lecturer can use learning facilities properly, and online learning activites are also carried out well. However, the results of the study also showed that the majority of students stated that online learning was not easier to understand and was not more interesting when compared to conventional learning.
Viability of R-290 Refrigerant as Residential AC Retrofit: Effect of Charge Mass Variations Aulia, Irham; Haftirman, Haftirman; Berman, Ega Taqwali
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol 7, No 2 (2025)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v7i2.30904

Abstract

The growing concerns over ozone depletion and global warming caused by refrigerants have led to the search for environmentally friendly alternatives. This study evaluates the impact of varying R-290 refrigerant charge masses on the performance of a wall-mounted residential air conditioner using the drop-in substitute method. A ¾ HP residential AC unit originally charged with 550 grams of R-22 refrigerant was retrofitted with R-290 and tested at charge masses of 140 grams, 165 grams, and 190 grams—approximately 25%, 30%, and 35% of the original R-22 charge, in accordance with the commonly applied “one-third rule.” The results showed that retrofitting with R-290 increased the Refrigeration Effect (RE) by up to 75%, Compression Work (Wc) by 68%, and Coefficient of Performance (COP) by up to 18%. The system with a 25% refrigerant charge was unable to reach the set temperature due to a 23% reduction in cooling capacity, while the 30% charge showed a 10% reduction. The 35% refrigerant mass retrofit proved the most suitable, achieving adequate cooling capacity, an 18% increase in COP, and a 14% reduction in power consumption. Additionally, the retrofit resulted in an indirect CO₂ emission reduction of 1.15 metric tons annually, highlighting the environmental and energy-saving advantages of using R-290. These findings provide empirical validation of the one-third rule for refrigerant mass variation in R-290 retrofits and offer valuable insights into optimizing performance and efficiency in residential AC units, with significant energy and environmental benefits.
Co-Authors Apri Wiyono Ega Taqwali Berman Haftirman, Haftirman Yundari, Yundari