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JTTM: Jurnal Terapan Teknik Mesin
Published by Sekolah Tinggi Teknologi Muhammadiyah Cileungsi
ISSN : 27215377     EISSN : 27217825     DOI : https://doi.org/10.37373/msn.v1i2.49
Core Subject : Engineering,
Aerospace Engineering Control & Systems Engineering Engineering Mechanical Engineering
Tujuan dari publikasi jurnal ini adalah untuk menyebarluaskan pemikiran konseptual atau ide dan hasil penelitian bidang teknik mesin yang telah dicapai. Jurnal Terapan Teknik Mesin, terutama berfokus pada masalah utama dalam hal hasil penelitian dan karya ilmiah Layanan Komunitas: Analisa Struktur, Material Teknik, Metalurgi, Kinematika, Dinamika, Termodinamika, Perpindahan Kalor, Teknik Material, Desain dan Manufaktur, Mesin Konversi Energi, Teknik Pendingin/Refrigrasi, Mekanisa Fluida, Mesin Fluida, Aerodinamika, Hidrodinamika, Metrologi, Getaran Mekanik, Otomasi Industri, Mekatronika.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 146 Documents
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Thermal performance analysis of PCM-integrated freezer systems using numerical simulation Sena, Boni; Muhamad Faturrahman Al Hafizh; Muhammad Penta Helios; Muhammad Azril Rahmaditya; Rinaldi Suzatmiko; Dimas Bahrudin; Pratikara Herlambang; Ridwan Abdul Hakim; Nadia Amanah; Nurnida Elmira Othman
JTTM : Jurnal Terapan Teknik Mesin Vol 7 No 2 (2026): JTTM: Jurnal Terapan Teknik Mesin
Publisher : Teknik Mesin - Universitas Muhammadiyah Cileungsi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37373/jttm.v7i2.1992

Abstract

Improving temperature stability in household freezers is an important aspect of energy conservation in refrigeration systems. One approach is the integration of Phase Change Materials (PCM) as thermal energy storage media. This study aims to design and analyze the thermal performance of a PCM-integrated freezer system using cooking oil and paraffin wax as candidate PCM materials. The refrigeration system was designed using R290 refrigerant and analyzed using CoolTools software for vapor compression cycle simulation and ANSYS Student for transient thermal simulation based on the Finite Element Method (FEM). The thermodynamic analysis produced an actual COP of 2.94 from the CoolTools simulation and a calculated thermodynamic COP of 3.27, indicating acceptable refrigeration performance under low-temperature operating conditions. The transient thermal simulation results showed that paraffin wax did not exhibit a distinct temperature plateau during the transient heating process, indicating that latent heat effects were not dominant within the simulated operating temperature range. Cooking oil demonstrated a faster thermal response due to its relatively higher effective thermal conductivity, whereas paraffin wax provided better temperature stabilization and delayed heat transfer behaviour. The results demonstrate that the thermophysical properties of PCM significantly influence heat transfer characteristics and temperature distribution inside the freezer compartment. Therefore, selecting PCM materials with appropriate latent heat capacity and thermal conductivity is essential for improving temperature stability and reducing temperature fluctuations in refrigeration systems.
Design and implementation of perfluoroelastomer (PFE) raw material cutting jig using 3D printing to improve valve cluster production efficiency at PT XYZ Yuselin, Nensi; Abiyyu, Muhammad Rafli
JTTM : Jurnal Terapan Teknik Mesin Vol 7 No 2 (2026): JTTM: Jurnal Terapan Teknik Mesin
Publisher : Teknik Mesin - Universitas Muhammadiyah Cileungsi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37373/jttm.v7i2.2170

Abstract

The raw material cutting process of is a crucial stage in the production of valve clusters at PT XYZ. The manual cutting method currently in use has several constraints, including inconsistent cut results, relatively long cutting times (an average of 28.2 seconds per cut), and the potential for defects due to non-uniform thickness. This research aims to improve the efficiency of the PFE cutting process and identify the optimal cutting process time by designing and implementing cutting jigs using 3D Printing technology. The DMAIC (Define, Measure, Analyze, Improve, Control) methodology is used as a research framework. In the Define stage, the main problems are identified namely inconsistencies in the cut results, high cycle times, and often production targets that are not achieved due to rejection. Data at the Measure stage shows that the manual cutting time by two operators is on average 28.2 seconds per cut. The analysis at the Analyze stage using fishbone diagrams identified the root of the problem from manual cutting methods, untrained operators, and the use of blunt razors. Based on the root of the problem found, at the Improve stage, a PFE cutting jig was designed using 3D Printing as a solution. The implementation of this jig has successfully lowered the average cutting time per piece of PFE to 24.55 seconds, compared to the manual method which averaged 28.2 seconds. This jig is expected to improve the consistency of the cut result and significantly reduce the cutting cycle time.
Grid integration of renewable energy: A systematic review bridging techno-economic optimization and smart grid architectures Prawiraharjo, Bagus Satrio Utomo; Rizky Adi Nugraha; A. Fajrin K. Wijaya; Bonifacius Raditya Yudha
JTTM : Jurnal Terapan Teknik Mesin Vol 7 No 2 (2026): JTTM: Jurnal Terapan Teknik Mesin
Publisher : Teknik Mesin - Universitas Muhammadiyah Cileungsi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37373/jttm.v7i2.2183

Abstract

The escalating penetration of renewable energy (RE) sources necessitates addressing interconnected technical barriers across stability, power quality, and intelligent governance. This study presents a systematic literature review (SLR) of Google Scholar, IEEE Xplore, Scopus, and ScienceDirect databases (2018–2024) to synthesize critical challenges in large-scale RE integration. Diverging from existing reviews that isolate technical domains, this work adopts a holistic framework connecting frequency stability, power quality (PQ) disturbances, techno-economic optimization, and smart grid architectures. Key findings reveal that inverter-based resources (IBR) induce critical inertia deficits and harmonic distortions, requiring hybrid mitigation strategies combining Battery Energy Storage Systems (BESS) with Synchronous Condensers (SC). Moreover, prevalent simulation tools exhibit significant seasonal deviations (RMSE >30%), underscoring the absence of localized calibration protocols. The analysis identifies substantial research gaps in standardized PQ metrics for DC microgrids, real-time adaptive protection systems, and cybersecurity frameworks for prosumer ecosystems. This review contributes a comprehensive taxonomy of integration barriers and delineates future trajectories toward resilient, data-driven power systems.
Analysis of impact strength and hardness of waste HDPE composites reinforced with ijuk fiber Nurfahmi, Ilyas; Rahmat Doni Widodo; Muhammad Irfan Nuryanta
JTTM : Jurnal Terapan Teknik Mesin Vol 7 No 2 (2026): JTTM: Jurnal Terapan Teknik Mesin
Publisher : Teknik Mesin - Universitas Muhammadiyah Cileungsi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37373/jttm.v7i2.2274

Abstract

The utilization of HDPE waste as a composite material is increasingly developing due to the industry's demand for materials that are lightweight, economical, and environmentally friendly. The properties of ijuk fiber, which has high strength and good elasticity modulus, make HDPE polymers stronger when used to be transformed into composite materials. The aim of this study is to analyze the effect of variations in the mass fraction of ijuk fiber on the mechanical properties of HDPE-based composites through impact and hardness tests. The composite material was made using HDPE plastic bottle caps as the matrix and alkalized ijuk fiber as reinforcement, with fiber mass fraction variations of 0%, 10%, 15%, and 20%. Specimens were made using an oven at 150°C, followed by hydraulic hot pressing at a pressure of 90 tons. Mechanical characterization was conducted using Charpy impact testing (ASTM D6110) and Shore D hardness testing. The research results show a consistent increase in mechanical properties with the increasing fraction of fibers used. The highest impact test result of 0.285 kJ/m² was obtained at a 20% fiber content, and the highest hardness test result of 60.89 Shore D was obtained at a 20% fiber content. These results indicate that the addition of ijuk fibers improves the energy absorption value and surface resistance of HDPE composite materials. Therefore, adding fibers up to 20% effectively enhances the mechanical performance of HDPE composites reinforced with ijuk fibers
The effect of infill structure modification on impact and flexural strength of recycled PET filament in fused deposition modeling Akmal, Yasir; Widodo, Rahmat Doni; Nuryanta, Muhammad Irfan
JTTM : Jurnal Terapan Teknik Mesin Vol 7 No 2 (2026): JTTM: Jurnal Terapan Teknik Mesin
Publisher : Teknik Mesin - Universitas Muhammadiyah Cileungsi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37373/jttm.v7i2.2278

Abstract

This study investigated the effect of hexagonal, re-entrant, and chiral infill structure modification on the impact and flexural strength of recycled polyethylene terephthalate (PET) filament derived from waste plastic bottles in the fused deposition modeling process. The increasing demand for sustainable materials in additive manufacturing encouraged the reuse of plastic waste as an alternative filament source. An experimental quantitative method was applied by producing recycled polyethylene terephthalate filament and printing test specimens using a three-dimensional printer in accordance with ASTM D256 for impact testing and ASTM D790 for flexural testing. The results showed that the chiral infill pattern produced the highest impact strength value of 0.00982J/mm², indicating superior energy absorption capability under dynamic loading. In contrast, the hexagonal pattern exhibited the lowest impact strength value of 0.00284J/mm². For flexural performance, the unpatterned specimens achieved the highest flexural strength of 14.84MPa, significantly surpassing the patterned specimens due to a larger effective cross-sectional area. In contrast, the hexagonal pattern showed the lowest flexural strength value of 2.16MPa. For the elastic modulus, the unpatterned specimens reached the highest stiffness of 0.27GPa. Conversely, the hexagonal pattern showed the lowest stiffness value of 0.028GPa. These findings affirm the existence of a trade-off between dynamic toughness and static flexural strength depending on the infill design. Therefore, the choice of infill should be adjusted according to the intended mechanical applications of the printed component
Experimental study of pressure effects on the thermal performance of trap pipes in a horizontal water-tube boiler Kurniawan, Irwan; Burhan Hafid; Jumarizan; Maksum
JTTM : Jurnal Terapan Teknik Mesin Vol 7 No 2 (2026): JTTM: Jurnal Terapan Teknik Mesin
Publisher : Teknik Mesin - Universitas Muhammadiyah Cileungsi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37373/jttm.v7i2.2281

Abstract

Boiler systems are widely used in industrial processes to convert fuel energy into thermal energy in the form of steam. Improving boiler thermal performance is essential to reduce fuel consumption, operating costs, and energy losses. One approach to enhance energy utilization is the recovery of residual heat from flue gases. In water-tube boilers, additional heat recovery components such as trap pipes can be installed along the flue gas path to capture unused thermal energy before it is discharged through the exhaust system. However, the thermal contribution of trap pipes in small-scale boilers operating at relatively low pressures has not been widely investigated. This study aims to experimentally evaluate the influence of operating pressure on the thermal performance of trap pipes installed in a horizontal water-tube boiler system. The experimental setup consists of a boiler with a water capacity of 588 liters fueled by waste oil. The trap pipe assembly includes 30 tubes with an outer diameter of 27 mm and a length of 398 mm, providing a total effective heat transfer area of 1.013 m². Experiments were conducted at operating pressures of 1, 2, 3, and 4 bar under steady-state conditions. Thermal performance was assessed using energy balance analysis to determine trap pipe efficiency, surface heat flux, and total heat loss. The results indicate that increasing operating pressure enhances the heat recovery capability of the trap pipe system. Trap pipe efficiency increased from 2.54% at 1 bar to 3.95% at 4 bar, while the surface heat flux showed a slight rise from approximately 16.75 kW/m² to 16.90 kW/m². Despite this improvement, total heat loss increased significantly with pressure due to higher fuel consumption and greater temperature gradients. These findings suggest that pressure elevation improves local heat transfer but also intensifies energy dissipation, indicating a thermodynamic trade-off in boiler operation

Page 15 of 15 | Total Record : 146

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