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All Journal Rotasi Jurnal Simetris SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Rekayasa Mesin Jurnal Mechanical Jurnal Teknik Mesin Jurnal Rekayasa Mesin Dinamika Teknik Mesin : Jurnal Keilmuan dan Terapan Teknik Mesin Jurnal Gema Ngabdi Techno Jurnal Karya Pengabdian Teknik Mesin Jurnal Pengabdian Masyarakat Bangsa Energy, Materials and Product Design
M. Mirmanto, M.
Teknik Mesin Universitas Mataram
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Effect of inlet air velocities on freshwater mass and heat transfer rates in an air-water harvester 0.5 PK M. Mirmanto; Y.A. Padang; A.K. Mari
Dinamika Teknik Mesin Vol 15, No 2 (2025): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v15i2.1168

Abstract

During the dry season, some regions experience a shortage of clean water due to drought. Air water harvesters utilize the principle of condensation to produce clean freshwater from humid air can be alternative to solve the drought. This device works by condensing water vapour in the air using an evaporator. The focus of this study was on the effect of air velocities on the freshwater production and heat transfer rates. This research was conducted experimentally using refrigerant R134a as the working fluid. The compressor used was a 0.5 HP rotary compressor. The inlet air velocities applied were 0 m/s, 1.5 m/s, and 3 m/s. The results showed that the highest average mass of water obtained was 3.73 kg using the air velocity variation of 3 m/s. Meanwhile, the total heat flow absorbed by the evaporator from the air was highest also at the air velocity variation of 3 m/s, which was 1238.22 W. Increasing inlet air velocities raises the freshwater production and heat transfer rates.
Effect of inlet air velocity on air-water harvester machines using one and two evaporator with 1.5 PK compressor power M.A. Vayasqi; Y.A. Padang; M. Mirmanto
Dinamika Teknik Mesin Vol 15, No 2 (2025): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v15i2.1077

Abstract

During the dry season, clean water crisis often occurs in various parts of Indonesia. As a result, clean potable water is difficult to obtain. Therefore, this research uses an air-water harvester machine, because this machine can be used anywhere as long as there is a source of electricity at that location. This study aims to determine the effect of inlet air velocity on air-water harvester machines using one and two evaporators with 1.5 PK rotary compressor power on water mass and total heat transfer rate. The method used in this research is the experimental method, with variations in inlet air velocity of 0 m/s, 1.5 m/s and 3 m/s, using one and two split AC fin type evaporators each with a capacity of 0.5 PK, with a pipe diameter of 7.65 mm. The refrigerant used is R32. The study was conducted from 09:00 to 16:00, for 18 days, 7 hours per day. The results showed that the higher the air velocity used and the increase in the number of evaporators, can increase the mass of water and the heat transfer rate obtained. The highest mass of water and heat transfer rate obtained in this study is in the air velocity variation of 3 m/s using two evaporators, which is 4.073 kg of water mass for 7 hours and a total heat transfer rate of 1375.09 W.
Performance of an Air-Water Harvester Machine under Various Inlet Air Relative Humidity Conditions Mirmanto Mirmanto; Made Wirawan; Faniar Reza Khatami; Arif Mulyanto; Yesung Allo Padang; Nurchayati Nurchayati; Jayus Kharisma Hendra
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, Agustus 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Atmospheric water harvesting (AWH) using vapor-compression refrigeration systems has emerged as a promising approach for decentralized freshwater production. Although previous studies have investigated the effects of refrigeration-system configurations and operating parameters on water production, the influence of inlet air relative humidity on freshwater productivity, heat-transfer characteristics, and thermodynamic performance has not been comprehensively evaluated within a single experimental framework. This study experimentally investigates the performance of an air-water harvester operating at inlet relative humidities of 30%, 50%, and 70% under controlled laboratory conditions. Freshwater production, coefficient of performance (COP), total heat absorbed by the evaporator, and evaporator efficiency were evaluated using measurements of temperature, pressure, airflow velocity, electrical power consumption, and psychrometric properties. The results show that increasing inlet relative humidity significantly enhanced condensation and system performance, yielding the highest freshwater production of 0.345 kg and the maximum COP of 12.19 at 70% RH. In contrast, the highest evaporator efficiency (11.89%) and total heat absorbed by the evaporator (167.81 W) were obtained at 30% RH, where sensible heat transfer dominated the cooling process. The findings indicate that inlet air relative humidity strongly influences the distribution of sensible and latent heat transfer, thereby affecting both freshwater production and energy performance. This study provides an integrated experimental assessment of the thermodynamic response of refrigeration-based AWH systems to varying inlet humidity and offers practical guidance for optimizing system operation in humid tropical environments.
Co-Authors A. Abdullah A. Albayani, A. A. Maulana A. Mulyanto A.D. Catur A.D. Catur A.K. Mari Anggani, Yudi Arief Mulyanto Arif Mulyanto Arif Mulyanto, Arif B.H. Saputra Buyung Anugerah D.F. Nansah D.K. Putra Emmy Dyah Sulistyowati, Emmy Dyah F. Pramudia Fahrurrozi, Imam Fahrurrozi, Imam Faniar Reza Khatami Fathurrahman, F. Guna, Patar Dayu H.S. Tira Hendra Ananta, Hendra Hendra, J.K. Hendry Sakke Tira, Hendry Sakke I Gede Bawa Susana I Made Adi Sayoga I Made Adi Sayoga I Made Adi Sayoga, I Made I Made Adi Sayoga, I Made Adi I Wayan Joniarta I. Fathoni I.B. Alit I.B. Alit, I.B. I.G.A.K.C Adhi I.M. Mara I.M. Suartika Ida Bagus Alit IGNK Yudhyadi Jayus Kharisma Hendra Lalu R Hidayatullah M. Athar, M. M. Faisal M. Mara M. Wirawan M. Wirawan M.A. Vayasqi Made Wirawan Made Wirawan Made Wirawan, Made Mara, M. Mirmanto Muhammad Athar N. Nurchayati, N. N. Nurpatria N. Nurpatria, N. Nuarsa, I.M. NURCHAYATI Nurchayati Nurchayati Nurpatria Nurpatria Nurpatria P. Pandiatmi Pabriansyah, A. Padang, Y.A. Pandri Pandiatmi Pandri Pandiatmi Pandri Pandiatmi Pandiatmi Patar Dayu Guna R. Kurniawan R. Romdhani, R. R. Sutanto Ramadhani, M.D. Rudy Sutanto S. Romdani, S. S. Sinarep S. Sukmawaty, S. S. Syahrul S. Syahrul S. Syahrul, S. Sayoga, I.M.A. Sinarep Sinarep Sinarep Sinarep Sinarep Sinarep Sinarep Sofa Amrillah, Ahmad Sugiman . Sujita, Sujita sutrisno, ahsani Syahrul Syahrul Syahrul Syahrul Syahrul Tarmisi, Ahmad Tira, H.S. Waasi, A. Y.A. Padang Y.A. Padang Yesung Allo Padang Yesung Allo Padang, Yesung Allo Yudhyadi, I Gusti Ngurah Ketut Z. Zulkarnain, Z. Zulfitri, Z. Zulkarnain Zulkarnain