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Piston: Journal of Technical Engineering
Published by Universitas Pamulang
ISSN : 25413511     EISSN : 26862247     DOI : http://dx.doi.org/10.32493/pjte.v5i2.19158
Core Subject : Engineering,
Aerospace Engineering Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering
Ansor Salim Siregar, Mulyadi Mulyadi, Syaiful Arief Analisis Kegagalan Laminasi Komposit Epoksi/Serat Karbon Pada Sayap Pesawat Tanpa Awak DOI: 10.32493/pjte.v5i2.18596 Parlindungan Pandapotan Marpaung, Herbert H. Rajagukguk Energi Mekanik Penggerak Poros Magnet Rotor Alternator untuk Pembangkit Listrik AC DOI: 10.32493/pjte.v5i2.19158
Arjuna Subject : Energi (semua kategori) - Energi (Lain-Lain)
Articles 227 Documents
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Performance Analysis of a Two-Stage Savonius Rotor Using Numerical Methods Aziz, Abdul; Rama, Hilfama; Al-Huda, M. Firash; Zahndi, Mirwan; Sumiati, Ruzita
Piston: Journal of Technical Engineering Vol. 9 No. 2 (2026)
Publisher : Program Studi Teknik Mesin Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v9i2.54065

Abstract

The POCREN system is a hybrid renewable energy device that integrates wind, solar, and water current energy sources to generate electrical power. The main objective of developing POCREN is to provide a sustainable electricity supply, particularly for floating fish farmers in coastal regions where the average wind speed ranges from 3 to 5 m/s. Currently, most floating cage farmers rely heavily on diesel engines to meet their electricity needs, which are costly and environmentally unsustainable. This study focuses on one of the key components of the POCREN system, namely a two-stage Savonius wind turbine, to evaluate its performance in power generation. The analysis was conducted numerically using ANSYS Fluent software. The results show that the maximum power coefficient (Cp) of the two-stage turbine was achieved at a wind speed of 5 m/s with a tip speed ratio (TSR) of 0.7, yielding a Cp value of 0.26. At a lower wind speed of 3 m/s, the maximum Cp reached 0.22 at the same TSR of 0.7. Pressure contour analysis indicates that the two-stage Savonius turbine can operate effectively at low wind speeds of approximately 3 m/s. The pressure distribution shows higher pressure on the concave side of the advancing blade compared to the convex side, generating torque that drives rotor rotation. This confirms that the two-stage configuration enhances torque continuity and enables stable operation under low wind conditions. Based on these findings, the two-stage Savonius turbine in the POCREN system is suitable for renewable energy applications in coastal environments, offering a promising alternative to reduce dependence on diesel-powered generators for floating fish farming activities.
Performance Evaluation of an Integrated Heat Pump Fluidized-Bed Dryer with Solar and Biomass Furnace for Paddy Drying Yahya, M.; Yuwazama, Zido; Wardianto, Dedi; Pratiwi, Putri; Agusman, Delvis
Piston: Journal of Technical Engineering Vol. 9 No. 2 (2026)
Publisher : Program Studi Teknik Mesin Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v9i2.55474

Abstract

This study aims to evaluate the performance of a heat pump fluidized-bed dryer incorporating a biomass furnace and a solar collector for paddy drying. The paddy moisture content (MC) was decreased from 28.52% to 16.28% on a dry basis (db) through the drying process over 23.68 minutes, under operating conditions of a mass flow rate of 0.1033 kg/s and an average temperature of 70 °C. An average drying rate of 0.042 kg/min was achieved, corresponding to a specific moisture extraction rate of 0.24 kg/kWh. Correspondingly, the system required average specific electrical and thermal energy consumptions of 7.43, 3.21, and 4.22 kWh/kg, respectively. The biomass furnace demonstrated a high thermal efficiency of 87.9%, while the solar collector achieved an average efficiency of 31.7%. The heat pump exhibited stable performance, with an average coefficient of performance measured at 3.2. The heat pump condenser, solar collector, and biomass furnace generated average heat energies of 2.37 kW, 0.79 kW, and 2.91 kW, respectively. The dryer exhibited average thermal and pickup efficiencies of 21.8% and 40.4%. The average exergy efficiency was 57.7%. Furthermore, the incorporation of the heat recovery exchanger resulted in an approximate 47% reduction in heat energy consumption.
Development of Regulatory Recommendations for City Bus Bumper Bars through Design and Analysis Based on Standard 67 Pa. Code § 171.44 Sukoco, Leonardo Paksi; Aravy, Mochammad Avrieza Havies; Banna, Nurrahim Hasan Al; Winesti, Feby Ayu
Piston: Journal of Technical Engineering Vol. 9 No. 2 (2026)
Publisher : Program Studi Teknik Mesin Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v9i2.56539

Abstract

Indonesia currently does not have specific technical regulations governing the design of urban bus bumper bars, unlike passenger vehicles, which are regulated by national and international standards. Data from the Indonesian National Police Traffic Corps in 2022 recorded 3,847 bus-related accidents resulting in 587 fatalities, with 42 percent occurring in urban areas at speeds ranging from 30 to 50 km/h. This study aims to develop regulatory recommendations for urban bus bumper bars by adapting the standard 67 Pa. Code §171.44 to Indonesian operational conditions. The research methodology includes field observations of 10 Trans Jogja buses, bumper bar design using a combination of 6061-T6 aluminum alloy and elastomer materials, and structural performance analysis through impact simulations based on the Explicit Dynamics finite element method using ANSYS software. The simulation results show that the proposed bumper bar design satisfies safety requirements, with maximum stress values of 260 MPa at 30 km/h and 293 MPa at 50 km/h. Although the stress at 50 km/h exceeds the material yield strength of 280 MPa, the response indicates localized plastic deformation without global structural failure. Controlled deformation of 163.04 mm at 30 km/h and 275.78 mm at 50 km/h, following a localized progressive deformation pattern without excessive intrusion, along with an energy absorption capacity of at least 5 kJ, demonstrates effective passenger protection. The resulting regulatory recommendations include dimensional specifications (height 400–600 mm, width ≥2000 mm), material requirements (yield strength ≥250 MPa), and performance criteria to support the revision of Minister of Transportation Regulation No. 33 of 2018.
Analysis of Cooling Load Performance with CLTD Method Case Study: Al-Furqon Mosque Dewanto, Ramadhan Haryo; Fahrudin; Rhakasywi, Damora
Piston: Journal of Technical Engineering Vol. 9 No. 2 (2026)
Publisher : Program Studi Teknik Mesin Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v9i2.56548

Abstract

Thermal comfort in worship spaces is an important aspect that affects the quality of religious activities. However, intermittently occupied worship spaces, such as mosques during Jummah prayers, often experience spikes in heat load due to the accumulation of sensible and latent heat from occupants and solar radiation. This study aims to analyze the actual cooling load and determine the cooling load required to achieve a comfortable room temperature based on the Cooling Load Temperature Difference (CLTD) method. Temperature measurements were taken using data loggers at one outdoor point and nine indoor points during five Fridays between October 10 and November 7, 2025, from 11:00 a.m. to 1:00 p.m. Western Indonesian Time. Cooling load calculations were based on occupancy variations of 100, 300, and 600 people and comfort temperature targets of 23°C, 25°C, and 27°C. The results showed that the temperature in the worship hall was well above the thermal comfort limit. The actual cooling load increased significantly between 12:00 p.m. and 1:00 p.m. WIB and during peak occupancy, reaching a peak load of 570,116.3 Btu/h. To achieve a comfortable room temperature, the cooling capacity needs to be increased by 8–35%. The final capacity recommendation based on the measurements and ASHRAE standards ranges from 44–69 TR. It can be concluded that the cooling system of Al-Furqon Mosque is currently under capacity and requires increased capacity and adaptive operational strategies to achieve thermal comfort in intermittently occupied worship spaces in a tropical climate.
Utilization of Coconut Shells as a Source of Graphene Nanosheets Fe/N-GNS for Environmentally Friendly Primary Battery Electrodes Giyanto; Affi, Jon; Gunawarman; Handayani, Murni; Yetri, Yuli
Piston: Journal of Technical Engineering Vol. 9 No. 2 (2026)
Publisher : Program Studi Teknik Mesin Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v9i2.57488

Abstract

The research on the performance of carbon (C)/d-orbital metals (graphite/graphene, graphene/N-graphene, graphite/Fe-graphene, graphite/Fe-N-graphene, and graphene/Fe-N-graphene) in primary battery electrode systems was carried out using a simple technology by mixing coconut shell powder with N and Fe. The purpose of this study was to determine the preparation method of Fe/GNS and Fe/N-GNS electrodes and to evaluate the performance of the electrolyte on electron distribution in Fe/GNS and Fe/N-GNS electrodes as primary battery anodes based on electrical conductivity values. This research was conducted as a laboratory experimental study. GNS and N-GNS were synthesized using a modified Hummers method, while Fe/GNS and Fe/N-GNS electrodes were synthesized using the impregnation method. GNS, N-GNS, Fe/GNS, and Fe/N-GNS after electrolyte combination were characterized using SEM–EDX and a multimeter, respectively. The SEM–EDX results at 170 °C and 500–600 °C showed a folded and wrinkled graphene structure with dispersed Fe (5.3 wt% by EDX), dominated by C and O. The addition of Fe–NH₃ acted as a catalyst to form more regularly structured graphite. The DHL test showed the highest electrical conductivity (~51,400 at 40 V) for Fe-N-GNS samples synthesized at 170 °C and 600 °C, which were identified as the most optimal synthesis conditions.
Synthesis of Graphene-Like Carbon from Coconut Shell and Electrical Conductivity Properties Rohmat, Nur; Affi, Jon; Gunawarman; Handayani, Murni; Yetri, Yuli
Piston: Journal of Technical Engineering Vol. 9 No. 2 (2026)
Publisher : Program Studi Teknik Mesin Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v9i2.57489

Abstract

Demand for batteries continues to increase in line with the growth of electric vehicles, while the availability of lithium in nature is limited. One alternative is the use of renewable natural materials, such as coconut shells, to produce functional carbon materials. This study aims to synthesize graphene-like carbon (GLC) from coconut shells using pyrolysis and sonication methods. The process was carried out through drying at 150–200 °C and pyrolysis at 700 °C. XRD characterization showed main peaks at 2θ ≈ 23.11° and 43.75° (150 °C/700 °C), and 23.15° and 43.38° (200 °C/700 °C), with an interlayer spacing of 0.35 nm and a shift in the C (002) peak from pure graphite, indicating the formation of nanosized graphene layers. FTIR analysis confirmed the presence of O–H, aromatic C=C, C=O, and C–O groups, indicating a hexagonal carbon framework with oxygen functionality on the surface. The Raman spectrum showed ID/IG ratios of 0.84 and 0.83, indicating structural disorder while still consistent with graphene-like characteristics. Conductivity tests showed relatively stable electrical conductivity with gradual electron energy loss at small current increases, allowing better control of electron mobility.
Synthesis and Characterization of Dual-doped (Al, Co) ZnO Nanofibers for Sustainable Piezoelectric Nanogenerator Applications Tauvana, Ade Irvan; Nulhakim, Lukman; Nurfadillah, Elsa
Piston: Journal of Technical Engineering Vol. 9 No. 2 (2026)
Publisher : Program Studi Teknik Mesin Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v9i2.53435

Abstract

This study reports the structural and morphological enhancement of aluminum (Al) and cobalt (Co) co-doped ZnO nanofibers synthesized via electrospinning for piezoelectric applications. The morphology and elemental composition were systematically analyzed using Scanning Electron Microscopy coupled with Energy-Dispersive X-ray Spectroscopy (SEM–EDX), while crystallographic properties were evaluated by X-ray Diffraction (XRD). SEM analysis revealed that the electrospun Al–Co co-doped ZnO nanofibers formed a highly interconnected and porous fibrous network with a uniform diameter distribution and negligible agglomeration, exhibiting diameters of 100–200 nm. EDX results confirmed the successful incorporation of Al and Co dopants into the ZnO matrix without detectable impurities. XRD patterns indicated a well-defined hexagonal wurtzite crystal structure with high crystallinity and a pronounced preferred orientation. The crystallite size, calculated using the Scherrer equation, ranges from 84 to 106 nm. The variation in crystallite size among different diffraction peaks is mainly attributed to differences in peak broadening (FWHM), which may indicate anisotropic crystallite growth and varying degrees of lattice orderingIn addition, the microstrain increased from 1.5 × 10⁻⁴ to 3.8 × 10⁻⁴, suggesting lattice distortion induced by Al³⁺ and Co²⁺ substitution. These findings demonstrate that Al–Co co-doped ZnO nanofibers possess favorable structural characteristics for advanced piezoelectric material development.

Page 23 of 23 | Total Record : 227

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