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All Journal JURNAL DINAMIKA VOKASIONAL TEKNIK MESIN Infotekmesin
Lovyta Putri Adianti
Politeknik Elektronika Negeri Surabaya
Computer Science & IT Education Electrical & Electronics Engineering Mechanical Engineering Social Sciences

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EXPERIMENTAL STUDY OF REFRIGERANT REPLACEMENT FROM R-22 TO R-290 HYDROCARBON IN DOMESTIC AC Arrad Ghani Safitra; Prima Dewi Permatasari; Teguh Hady Ariwibowo; Lohdy Diana; Nabila Haninda Az Zahra; Lovyta Putri Adianti
Jurnal Dinamika Vokasional Teknik Mesin Vol. 8 No. 1 (2023)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v8i1.65204

Abstract

Most of the refrigerant used in split-type AC machines is HCFC type R-22, which can potentially damage the ozone layer and global warming. Musicool-22 is a trade name for the hydrocarbon refrigerant R-290, an alternative refrigerant that can replace R-22. Tests were carried out on the test equipment by comparing R-22 and Musicool-22 with the same variation of thermal load. Based on the test, the performance of the two working fluids can be determined by determining the coefficient of performance (COP) and comparing it with various cooling loads. In addition, it is proven that using Musicool-22 can save electrical energy and the power value of the compressor. The data measured are temperature, pressure, voltage, and electric current. Based on the results of calculations carried out by changing R-22 to Musicool-22, it shows that the COP value increases. The highest COP of R-22 is 2.45 at an 80-Watt load, and Musicool-22 is 4.21 at a 320-Watt load. The application of Musicool-22 can save electrical energy by 15.40%. Moreover, it saved electricity usage costs of IDR 44,450.53 per month.
Electrical Energy Saving Analysis in Educational Buildings Using CLTD and ECI Methods Arrad Ghani Safitra; Lohdy Diana; Lovyta Putri Adianti; Naja Imama Mufidah
Infotekmesin Vol 17 No 2 (2026): Infotekmesin: Juli 2026
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/

Abstract

An energy audit is a systematic assessment conducted to evaluate energy consumption and identify opportunities for improving energy efficiency in buildings. This study evaluates electrical energy consumption in three computer laboratories of the D3 PENS Building using the Energy Consumption Intensity (ECI) and Cooling Load Temperature Difference (CLTD) methods. The analysis was conducted based on measurements of room dimensions, indoor environmental conditions, electrical energy consumption, and cooling loads. The ECI values obtained for laboratories JJ-204, JJ-101, and JJ-310 were 24.44, 18.17, and 19.91 kWh/m²/month, respectively, indicating relatively high energy consumption. The CLTD analysis indicated that the cooling load was affected by external and internal heat gains, particularly those generated by occupants and computer equipment. The combined application of CLTD and ECI provides an assessment of the relationship between cooling load and electrical energy consumption. Energy conservation measures were proposed through operational adjustments, air-conditioning maintenance, and refrigerant replacement. The replacement of R-22 with MC-22 was estimated to reduce electricity consumption by 15.40%, corresponding to potential monthly savings of IDR 476,887.95. The study was limited to three computer laboratories under normal operating conditions and did not involve dynamic building energy simulation.
Co-Authors Arrad Ghani Safitra Lohdy Diana Nabila Haninda Az Zahra Nabila Haninda Azzahra Naja Imama Mufidah Prima Dewi Permatasari Teguh Hady Ariwibowo