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All Journal Proceedings of the International Conference on Applied Science and Health Jurnal Medikes (Media Informasi Kesehatan) Jurnal Pengabdian kepada Masyarakat Nusantara International Journal of Applied Technology Research Jurnal Difusi Industrial Research Workshop and National Seminar Journal of Midwifery and Health Research Jurnal Menara Pengabmas Jurnal Polimesin
Nani Yuningsih, Nani
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Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Journal : Jurnal Polimesin

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Designing of Evaporator Length in Very Low Temperature Chest Freezer by using Environmentally Friendly Refrigerant R290 Sumeru, Kasni; Nugraha, Ridwan; Badarudin, Apip; Simbolon, Luga Martin; bin Sukri, Mohamad Firdaus; Yuningsih, Nani
Jurnal Polimesin Vol 21, No 5 (2023): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i5.4103

Abstract

Chest freezers generally use R600a or R134a as working fluids. When using R600a, the minimum cabin temperature is only -10oC, whereas when using R134a, it can reach -25oC. The purpose of this study is to calculate the evaporator length of a chest freezer that uses R290 as a refrigerant so that its cabin temperature can reach below 35 oC, lower than the cabin temperature of a typical chest freezer. Calculation of the evaporator pipe length is done using the forced convection heat transfer equation to calculate the heat transfer coefficient inside the evaporator pipe and natural heat transfer to calculate the heat transfer coefficient outside the evaporator pipe.  Based on the calculations, the chest freezer has a compressor capacity of 200 W, an evaporator length of 3.57 m, and a diameter of 3/8 inch or 9.52 mm. The test results show that the temperature of the chest freezer cabin can reach -36oC in the 36th minute with a cooling capacity of 289 W, while the input power and COP are 198 watts and 1.46, respectively. Compared to R134a, the use of R290 is more advantageous. In addition to lower cabin temperatures, it is also much more environmentally friendly, because the GWP (global warming potential) value of R134a is much higher than that of R290. It means that the use of R290 as a working fluid in the chest freezer will significantly reduce emissions of gases that cause global warming.
Energy savings in residential air conditioners using condensate cooling in discharge and liquid lines Yuningsih, Nani; Sumeru, Kasni; Aldiansyah, Muhammad; Tritjahjono, Rachmad Imbang; Nugraha, Fathurahman Yudhi; Abioye, Adenkunle Moshood
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.6739

Abstract

This research investigates the use of condensate produced by the evaporator to cool the discharge and liquid lines in order to reduce electricity consumption in a residential split-type air conditioner (AC). The experimental setup used a 0.75 kW compressor with R32 refrigerant, where the discharge and liquid line heat exchangers were 20 cm and 15 cm long, respectively. Data were collected over 180 minutes at 5-minute intervals. Results show that using the liquid line cooler (LLC) alone reduced electricity consumption by 5.3% and increased cooling capacity by 2.3%. Using the discharge line cooler (DLC) alone reduced electricity consumption by 8.3% and increased cooling capacity by 7.3%. When both coolers were applied simultaneously (LDC mode), electricity consumption decreased by 10.9% and cooling capacity increased by 9.7%. The corresponding improvements in coefficient of performance (COP) were 9.1% (LLC), 18.6% (DLC), and 24.7% (LDC). These results indicate that using condensate to both the discharge and liquid lines is more effective in reducing electricity consumption and improving AC performance than cooling only one line.
Co-Authors Abioye, Adenkunle Moshood Agoes, Farida Aldiansyah, Muhammad Andriyanto Setyawan Ayi Tansah Badarudin, Apip bin Sukri, Mohamad Firdaus H., Kunlestiowati Husnida, Nintinjri Ismiyati Iswanti, Tutik Iswanto, Rery Kurniawati Danu Kasni Sumeru Khofifah, Ananda Anggis KURNIASETIAWATI, ANNISA Margana, Ade Suryatman Melyana Nurul Widyawati Mitrakusuma, Windy Hermawan Muhammad Akmal Muhammad Arman Muldiani, Ratu Fenny Najyah, Fatya Naja Nugraha, Fathurahman Yudhi Nugraha, Ridwan Nuryati, Neneng Pramudantoro, Triaji Pangripto Purwaningsih, S.S. Raji, Lukman Rohaeti, Ayi Tansah Rokayah, Yayah Rosulindo, Parisya Premiera Rumiatun, Darti Simbolon, Luga Martin Sumeru, Husain Akbar Susilawati Sutianingsih, Hani Sutomo, Omo Syarif Hidayat Tritjahjono, Rachmad Imbang Widjanarko, Bangun