cover
Contact Name
M. Uswah Pawara
Contact Email
uswah.pawara@lecturer.itk.ac.id
Phone
+6285244317201
Journal Mail Official
ismatech.journal@itk.ac.id
Editorial Address
Gedung B306. Jl. Soekarno Hatta No.KM 15, Karang Joang, Kec. Balikpapan Utara, Kota Balikpapan, Kalimantan Timur 76127
Location
Kota balikpapan,
Kalimantan timur
INDONESIA
Indonesian Journal of Maritime Technology or abbreviated (ISMATECH)
ISSN : -     EISSN : 3025518X     DOI : https://doi.org/10.35718/ismatech.v1i1
Core Subject : Engineering,
Focus and Scope Research titles encompassed by this journal include, but are not limited to: Naval Architecture: covering ship strength, Ship Hydrodynamics, Ship Construction, Ship Production Management, Wooden and FRP Ship Materials, Ship Design Innovation, Ship Vibration and Noise, Welding Technology, Fatigue, Sea Transportation, Computational Fluid Dynamic Modeling. Marine Engineering: encompassing Engine Performance, Renewable Fuels, Dual fuel system, Ship electricity, Ship Resistance, Ship piping systems, Ship reliability). Ocean engineering: Marine and Offshore Structures, Coastal Structures and Management, Port Structures and Management, Subsea Umbilicals, Risers and Flowlines (SURF), Ocean Renewable Energy, Marine Instrumentation, Marine Pollution. Mechanical engineering: addressing Tribology, Energy Studies, Engines and Turbines, Heat Transfer, Fluid Mechanics, Lubrication and Wear, Materials Science, Mechatronics, Refrigeration and air conditioning, Pressure analysis, Structural and mechanical design, Renewable energy, Structural mechanics, Thermodynamics, Materials processing, Vibration).
Articles 52 Documents
Development of Practical Wind-Assisted Ship Propulsion (WASP) Calculation for Fuel Consumption and Emission Reduction Aulia Marifa, Isna; Purnama Sari, Dian; Sulistyawati, Wiwin
Indonesian Journal of Maritime Technology Vol. 4 No. 1 (2026): Volume 4 Issue 1, June 2026
Publisher : Naval Architecture Department, Kalimantan Institut of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/ismatech.v4i1.8481967

Abstract

Integration of Wind-Assisted Ship Propulsion (WASP) serves as a strategic solution for the maritime industry to achieve Net Zero Emission by 2050. This research evaluated the interaction between sail design and route optimization for a 265 GT fishing vessel operating around Benoa, Bali to maximize fuel savings and emission reductions. Three hard sail profiles, arc-shaped, NACA 0012, and NACA 0015, were analyzed at operational speeds of 7 and 10 knots. An improved weather-routing framework based on the A* (A-star) algorithm* was developed, integrating weather forecasts, ship specifications, and force matrices to determine optimal navigational paths. Simulations conducted on routes around Benoa, Bali, demonstrated that the combination of aerodynamic wing sails and intelligent routing improved efficiency by 1.24% to 12.59%. The results confirmed that the synergy between WASP technology and precise pathfinding significantly reduced carbon footprints while enhancing the economic viability of shipping operations. These findings provide a scalable framework for sustainable maritime practices and for achieving global decarbonization targets.
Energy Efficiency Analysis of Main Cooling Pump System on Bulk Carrier Using VSD Rayhan, Fajri Ashfi; Alma, Rashieka
Indonesian Journal of Maritime Technology Vol. 4 No. 1 (2026): Volume 4 Issue 1, June 2026
Publisher : Naval Architecture Department, Kalimantan Institut of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/ismatech.v4i1.8481980

Abstract

Improving energy efficiency in marine auxiliary systems has become increasingly important due to rising fuel consumption, stricter environmental regulations, and global green shipping initiatives. Conventional seawater cooling pumps on bulk carrier vessels generally operate at constant speed regardless of cooling demand, resulting in excessive energy consumption under partial-load conditions. Previous studies mainly focused on general Variable Speed Drive (VSD) applications, while limited research investigated the integrated performance of seawater cooling systems in bulk carriers, particularly the relationship between pump energy consumption, heat transfer performance, and operational efficiency. This study was conducted to evaluate the energy efficiency of the main cooling pump system on a bulk carrier vessel through the implementation of a Variable Speed Drive (VSD). The analysis was conducted using a thermodynamic simulation approach under steady-state conditions by applying pump affinity laws, heat transfer equations, and operational data from a MAN B&W S42MC marine diesel engine under various engine loads and seawater temperatures. The results show that VSD implementation reduced pump power consumption from approximately 26 kW to 2–10 kW under partial-load conditions, corresponding to improved pump efficiency, with a maximum efficiency of approximately 82% achieved near the Best Efficiency Point (BEP). The cooling system also maintained stable freshwater outlet temperatures around 36°C, indicating effective heat transfer performance, thermal stability, and improved cooling system energy efficiency. These findings confirm that VSD operation is highly effective under partial-load conditions and supports ship energy management systems to reduce fuel consumption and support sustainable green shipping practices.