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All Journal PROSIDING SEMINAR NASIONAL TEKNIK Proceeding Seminar LPPM UMP Tahun 2014 Proceeding Of The International Seminar and Conference 2015 Majalah Ilmiah MOMENTUM JPPM (Jurnal Pengabdian dan Pemberdayaan Masyarakat) Jurnal Pengabdian Masyarakat Teknik Advance Sustainable Science, Engineering and Technology (ASSET) Journal of Industrial and Mechanical Engineering
Muhammad Subri
Universitas Muhammadiyah Semarang
Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Public Health Social Sciences

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ANALISA PERBANDINGAN PENGGUNAAN REFRIGERANT R-134a & R-1270(MC-32) PADA SISTEM AIR CONDITIONING (AC) SPLIT 1 PK Sahlil, Mohammad Hasan; Pujianto, M Edi; Subri, Muhammad
Journal of Industrial and Mechanical Engineering Vol 2 No 1 (2024): Journal of Industrial and Mechanical Engineering
Publisher : Department of Industrial Engineering, Universitas Jenderal Soedirman.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jimien.2024.2.1.11836

Abstract

Pendingin udara disebut juga dengan sistem pendingin yang mempunyai fungsi mengatur suhu dan kelembapan udara. Dalam pengoperasiannya, sistem refrigerasi memerlukan zat cair yang mudah menyerap dan melepaskan panas yang disebut dengan refrigeran. Setiap refrigerasi mempunyai sifat berbeda-beda yang mempengaruhi efisiensi pendingin dan COP (coefficient of performance) yang dihasilkan. Oleh karena itu penelitian ini bertujuan untuk mengetahui perbandingan kinerja refrigeran R-1270(MC-32) dibandingkan R-134a dengan mengukur nilai kalor yang dilepas, efek refrigerasi dan COP (coefficient of performance). Variasi massa pengisian refrigerant R1270(MC-32) dengan 100% (228,9 gram) dan R134a 90% (496 gram), 100%(551 gram), 110%(606 gram) dari masa R32. Pengujian sistem dilakukan dengan menggunakan variasi temperatur masuk kondensor sebesar 28 ℃ , 30 ℃ , 32 ℃ dan 34 ℃. Penelitian dilakukan dengan memvariasikan penggunaan refrigeran pada AC split 1 PK. Berdasarkan data hasil perbandingan menunjukkan bahwa refrigeran R1270(MC-32) dapat menjadi alternatif pengganti R134a karena kalor yang dilepas dari refrigeran R-1270(MC-32) lebih tinggi dari R134a yaitu dengan nilai 335,767 kj/kg pada temperatur 28℃, nilai paling tinggi efek refrigrasi ada pada R-1270(MC-32) sebesar 323,878 kj/kg pada temperatur 28℃. Dan nilai COP tertinggi terdapat pada R-1270(MC-32) dengan nilai 31,326 di temperatur 34℃.
In Vitro Degradation and Mechanical Performance of Mg AZ31B for Biodegradable Bone Implant Applications Slamet Saefudin; Purnomo; Muhammad Subri; M. Edi Pujianto; Ilham Yustar Afif; Samsudi Raharjo
Advance Sustainable Science Engineering and Technology Vol. 8 No. 2 (2026): February-April
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v8i2.2652

Abstract

Magnesium AZ31B is a promising biodegradable implant material due to its mechanical properties comparable to natural bone and its ability to degrade in physiological environments, potentially eliminating the need for secondary surgery. However, its rapid degradation can cause a significant loss of mechanical integrity, limiting its use in load-bearing applications. This study investigates the evolution of mechanical properties and surface characteristics of AZ31B during in-vitro immersion in Simulated Body Fluid (SBF). Tensile tests were conducted on triplicate specimens after immersion for 3, 6, and 9 days, while surface morphology and corrosion products were analyzed using SEM–EDX. In addition, pH variation and mass loss were monitored to evaluate corrosion behavior. The results show a progressive decrease in tensile strength from 279.77 ± 5.30 MPa (0 days) to 167.64 ± 2.31 MPa after 9 days of immersion, representing an overall reduction of approximately 40%. This degradation was accompanied by increased surface corrosion, mass loss, and solution alkalization. These findings provide quantitative insight into the relationship between corrosion progression and mechanical degradation of AZ31B, highlighting its time-dependent performance limitations and the need for surface modification strategies in biodegradable implant applications.
Co-Authors Afif, Ilham Yustar Dini Cahyandari Eko Saputra Hanityo Adi Nugroho Hanityo Adi Nugroho Ilham Yustar Afif J. Jamari M. Edi Pujianto Mahfud, Akhmad Ulum Muh amin Muh. Amin Muh. Amin Muhammad Amin Muhammad Edi Pujianto Muntasiroh, Laily Pujianto, M Edi Pujianto, M. Edi Purnomo Purnomo . Saefudin, Slamet Sahlil, Mohammad Hasan Samsudi Raharjo SAMSUDI RAHARJO Sutarto TAUFIK ROHMAN, TAUFIK Zein, Husein Aliy Syamsu