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All Journal Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) Applied Science Technology in Naval Engineering (ASTNE)
Chantika, Shelfira Priti
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Aerospace Engineering Decision Sciences, Operations Research & Management Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering Other

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Pengaruh Variasi Bentuk Bulbous Bow Terhadap Komponen Hambatan Chantika, Shelfira Priti
Applied Science and Technology on Naval Engineering Vol 1 No 1 (2023): Applied Science and Technology on Naval Engineering (ASTNE)
Publisher : Fakultas Teknik UPN Veteran Jakarta

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Abstract

Seiring perkembangan teknologi pembuatan kapal mulai menunjukkan kepada arah yang lebih baik, kapal sebagai alat transportasiangkutan laut pilihan utama pengguna jasa dalam mengangkut kapasitas yang lebih besar. Penelitian ini bertujuan untuk menganalisis dan membandingkan hambatan kapal Roro pada bulbous bow dengan metode CFD dan variasi yang sudah dibuat dengan hambatan dipengaruhi oleh komponen gaya gesek, tekanan, daya ombak, dan kepadatan cairan. Model yang digunakanadalah cargo vehicle Roro yang sudah ditambahkan bulbous bow. Analisis hambatan kapal menggunakan metode Computational Fluid Dynamics dengan variasi kecepatan 13,5 knot ; 14,5 knot ; 15,5 knot; 16,5 knot; 17,5 knot, dan kecepatan tinggi pada fn 0,6; 0,8 ; dan 1,0. Penelitian ini diperoleh keefektifan pada model variasi bulbous bow dengan panjang 2 meter yang memiliki nilai komponen hambatan lebih kecil dibandingkan 3 model lainnya. Diharapkan penelitian ini dapat dikembangkan lebih lanjut dan memberikan pemahaman mengenai hambatan kapal dengan variasi bulbous bow.
Analysis of the Coefficient of Performance in a Cascade Flash Chamber Cooling System for Fishing Vessels Chantika, Shelfira Priti; Rayhan, Dr. Fajri Ashfi
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 70 No 1 (2026): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v70i1.586

Abstract

Global climate change is closely related to increasing greenhouse gas emissions, including those generated by energy-intensive refrigeration systems on fishing vessels. Conventional onboard cooling systems often operate at relatively low efficiency, resulting in high fuel consumption and environmental impact. This study aims to analyze the coefficient of performance (COP) of a cascade refrigeration system with a flash chamber for fishing vessel applications by evaluating the influence of refrigerant selection and intermediate operating temperature. A steady-state thermodynamic simulation model was developed using Engineering Equation Solver (EES). Three refrigerants, namely R134a, R404A, and R407C, were investigated under intermediate temperature variations of 10–30 °C. The model was validated through comparison with reference data from the literature. Simulation results include compressor power consumption, condenser heat rejection, evaporator heat absorption, and COP values. The results indicate that intermediate temperature significantly affects compressor work distribution between the low-stage and high-stage compressors. Among the evaluated refrigerants, R134a achieved the highest COP under all operating conditions, while R404A showed lower condenser heat rejection and cooling capacity. Overall, the cascade refrigeration system with a flash chamber demonstrates improved energy performance and offers a promising solution to reduce fuel consumption and greenhouse gas emissions in marine refrigeration applications.
Co-Authors Rayhan, Dr. Fajri Ashfi