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All Journal FLYWHEEL : Jurnal Teknik Mesin Untirta
Mujiarto, Sigit
Universitas Tidar
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Experimental Analysis of Water Column Height and Air Flow Rate Effects on Two-Phase Airlift Pump Performance Fidaroin, Arsyad Ni'am; Mujiarto, Sigit; Hayati, Nur; Saleh, Arif Rahman
FLYWHEEL : Jurnal Teknik Mesin Untirta Vol 11, No 2 (2025): October
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fwl.v11i2.35639

Abstract

This study experimentally investigates the effects of water column height and air flow rate on the performance of a two-phase airlift pump with a 15° injector angle. Two water column heights  and  and four air flow rates (30, 40, 50, and 60 LPM) were tested in a laboratory-scale setup. Efficiency was calculated using the Nicklin model, while effectiveness was determined based on the ratio of water to air mass flow rates. Flow patterns were recorded and analyzed using a high-speed camera. The results showed that increasing the water column height significantly improved both efficiency and effectiveness, with the highest values—12.270% and 2354.78, respectively achieved at  and 60 LPM. Flow pattern observations revealed that slug flow dominated at partial submergence, whereas churn flow became prevalent at full submergence with higher air flow rates. The findings demonstrate that optimizing submergence ratio, air flow rate, and injector configuration is essential for achieving high-performance and energy-efficient airlift pump operation.
Analysis of the Impact of Pressure on the Performance of A Split Air Conditioning System (AC) Using the Refrigerant R-410A Pratama, Ofik Wahyu; Saputra, Trisma Jaya; Sulistiyo, Raka Mahendra; Mujiarto, Sigit
FLYWHEEL : Jurnal Teknik Mesin Untirta Vol 12, No 1 (2026): April
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fwl.v12i1.36055

Abstract

Studi ini menganalisis efek fluktuasi tekanan pada kinerja pendingin udara (AC) sistem split menggunakan refrigeran R-410A. Masalah utama yang diselidiki adalah bagaimana tekanan operasi memengaruhi efek pendinginan dan koefisien kinerja (COP), serta efisiensi pendinginan sistem secara keseluruhan. Dalam metode eksperimen, tekanan refrigeran divariasikan menjadi 120, 130, 140, dan 150 psi. Data dikumpulkan pada setiap pengaturan tekanan selama satu jam dengan interval 10 menit. Hasilnya menunjukkan bahwa peningkatan tekanan refrigeran secara bertahap menurunkan kerja kompresor dan efek pendinginan. Tekanan 150 psi menghasilkan kerja kompresor paling sedikit (26,98 kJ/kg) dan nilai COP tertinggi (5), yang menunjukkan operasi sistem pendingin udara yang paling efisien. Sebaliknya, tekanan 120 psi memberikan efek pendinginan terbesar (141,35 kJ/kg), tetapi dengan nilai COP yang lebih rendah. Singkatnya, pengaturan tekanan 150 psi memberikan kinerja pendingin udara yang paling efisien, meskipun kapasitas pendinginan maksimum dicapai pada 120 psi.
Co-Authors Fidaroin, Arsyad Ni'am Nur Hayati Pratama, Ofik Wahyu Saleh, Arif Rahman Saputra, Trisma Jaya Sulistiyo, Raka Mahendra