Article Per Year (5 Year)
p-Index From 2021 - 2026
0.444
P-Index
This Author published in this journals
All Journal Majalah Ilmiah MOMENTUM Advance Sustainable Science, Engineering and Technology (ASSET)
Purnomo
Universitas Muhammadiyah Semarang
Chemistry Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Industrial & Manufacturing Engineering

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Pengaruh Temperatur Lingkungan Terhadap Kinerja AC Split 1 PK dengan Refrigerant R32 dan Brezon edi pujianto; Selamet Saefudin; Purnomo; Muhammad Ragil Febryan; Rizka Noor Miftakhul Ulum
JURNAL ILMIAH MOMENTUM Vol 21 No 2 (2025): Oktober 2025
Publisher : Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36499/mim.v21i2.14372

Abstract

Air conditioners (AC) are among the most widely used appliances in tropical countries such as Indonesia. However, high energy consumption and the use of refrigerants with high Global Warming Potential (GWP) pose major challenges to energy and environmental sustainability. This study aims to analyze and compare the thermodynamic performance of two types of refrigerants, namely R-32 and Breezon MC32 (R-1270), in a vapor-compression refrigeration system. Performance tests were conducted under varying ambient temperatures (28 °C, 31 °C, and 34 °C) and evaporator loads (19 °C, 22 °C, 25 °C, 28 °C). The main parameters analyzed include power consumption, compression work, mass flow rate, compressor power, heat rejection, refrigeration effect, cooling capacity, and Coefficient of Performance (COP). The results show that Breezon MC32 with a 90% charge mass achieves a higher COP and lower power consumption compared to R-32 with a 100% charge, particularly under high ambient temperature conditions. This demonstrates the potential of Breezon MC32 as a more environmentally friendly and energy-efficient alternative refrigerant. Keywords: cooling capacity, power consumption, COP, R-32, Breezon
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 Edi Pujianto Ilham Yustar Afif M. Edi Pujianto Muhammad Ragil Febryan Muhammad Subri Rizka Noor Miftakhul Ulum Saefudin, Slamet Samsudi Raharjo Selamet Saefudin