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INDONESIA
Jurnal Konversi Energi dan Manufaktur
Published by Universitas Negeri Jakarta
ISSN : 23392029     EISSN : 26225565     DOI : https://doi.org/10.21009/JKEM
Core Subject : Science, Engineering,
Aerospace Engineering Automotive Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
This journal aims as a medium for lecturers, researchers and practitioners to discuss result of their research in the field of mechanical engineering.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 192 Documents
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Computational Fluid Dynamics Analysis of the Effect of Stern Shape Modifications on Ship Resistance Julyus Acang Suwignyo Putro; I Putu Sindhu Asmara; Priyambodo Nur Ardi Nugroho
Jurnal Konversi Energi dan Manufaktur Vol. 11 No. 2 (2026)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.11.2.7

Abstract

The change of the propulsion system usually involves structural modifications of the stern, which have a large impact on the hydrodynamic behaviour of the ship, e.g. the total resistance and the flow field. Calculations of the drag force and flow velocity are performed in order to investigate the effect of the stern modifications on the vessel resistance. The study was carried out by means of Computational Fluid Dynamics (CFD) simulations in the ANSYS Workbench environment. The research compared four different skeg size variants used after modification of the original hull of the ship. The simulation results show that the flow velocity of the original hull was 3.220 m/s and the drag force was 118.70 kN. Among the tested variations, variation 4 emerged as the most efficient design, yielding a reduced drag force of 81.59 kN and an increased flow velocity of 3.461 m/s. Ultimately, the proposed stern modification successfully lowered the total ship resistance from 118.70 kN to 82.93 kN, achieving a significant 30% reduction in resistance.
Comparative Study of Split Air Conditioner Performance on Pipe Length Variations in R32, R410A, and R290 Refrigerants Imam Nursyahied; Thaha Ismail Jayadinata; Alynda Natasya Putri Ardianto; Aris Sunawar; Readysal Monantun
Jurnal Konversi Energi dan Manufaktur Vol. 11 No. 2 (2026)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.11.2.8

Abstract

Split air conditioners are one of the most commonly used air conditioning systems due to their compact design and flexible installation. The system consists of two units connected by copper pipes as a refrigerant circulation line. This study presents a comparative analysis of the thermodynamic performance of split AC on pipe length variations using three refrigerants, R32, R410A, and R290, with a simulation approach based on CoolProp v6.4 and REFPROP v10.0 software. The length variations of the tested pipes are 15, 20, 25, and 30 m with operating conditions according to ISO 5151:2017 standards. The parameters evaluated included cooling capacity (Qe), input power (Pinput), energy efficiency ratio (EER), and pressure drop (Δp). The accuracy of both software is measured using MAPE and RMSE metrics against manual calculations as a reference. The simulation results showed that the increase in pipe length led to an average decrease in Qe of 10.3-10.4% from the 15 m to 30 m pipe length in all three refrigerants. R290 recorded the highest EER (3.87-3.48), followed by R32 (3.72-3.33), and R410A (3.36-3.01). R410A produces the largest pressure drop (25.87 kPa at 30 m), while R290 has the lowest pressure drop (12.56 kPa). Accuracy analysis showed that REFPROP was more accurate than CoolProp on all parameters with an average MAPE difference of 0.57%, although the difference between the two was relatively small. Large deviations in the Δp parameter (>168%) are due to fundamental flow model differences, not thermodynamic errors. The results of this study provide a scientific reference in the selection of the optimal refrigerant and simulation software for split air conditioning installations with varying pipe lengths.

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