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Parlindungan Pandapotan Marpaung
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Program Studi Teknik Konversi Energi Jurusan Teknik Mesin Politeknik Negeri Semarang Jalan. Prof. H. Soedarto, S.H., Tembalang, Semarang.
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Eksergi: Jurnal Teknik Energi
Published by Politeknik Negeri Semarang
ISSN : 02168685     EISSN : 25286889     DOI : http://dx.doi.org/10.32497/eksergi.v18i2.3605
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Electrical & Electronics Engineering Energy Engineering Mechanical Engineering
Design of DC Accumulator Charging using Backup Accumulator Based on Inverter and Converter Device Parlindungan Pandapotan Marpaung
Arjuna Subject : Energi (semua kategori) - Energi (Lain-Lain)
Articles 260 Documents
 22   23   24   25   26 
Thermoelectric Conversion of Motorcycle Exhaust Heat into Alternative Electrical Energy: A Mini Review Pranata, Ragil Tri; Irawan, Nanda Satria; Santosa, Alvian Rizky; Althaf, Muhammad; Adinata, Bintang; Yang, Lee; Sandi, Dianisa Khoirum
Eksergi Vol. 21 No. 02 (2025): MAY 2025
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v21i02.6845

Abstract

Heat energy can be harnessed as an alternative source for electricity generation, including waste heat from motorcycle exhaust. Thermoelectric technology enables the direct conversion of this waste heat into electrical energy. This mini-review examines the utilization of motorcycle exhaust heat through thermoelectric systems. The findings indicate that exhaust temperatures can activate thermoelectric modules to produce electrical power, which can be used for applications such as motorcycle-mounted cell phone chargers. The generated electricity can also be stored in batteries to power lighting systems. Given Indonesia's high number of motorcycles, this technology shows strong potential for small-scale renewable energy generation, supporting advancements in sustainable energy solutions.
Study of Hybrid Wind and Solar Energy Power Plants: An Analysis of the Battery Charging and Discharging System Sumarno, F Gatot; Evan, Bah; Aspriyanti, Vita Ayu; Alwi, Muhammad
Eksergi Vol. 21 No. 03 (2025): SEPTEMBER 2025
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v21i03.7098

Abstract

Alternative energy can address the issue of PLN electricity supply, which is not available in all regions of Indonesia. The hybrid system of solar cells and wind turbines is a clean and environmentally friendly energy source because it does not produce carbon dioxide (CO₂) or other gases that play a role in global warming. The purpose of this final project is to analyze the length of time needed by a hybrid generator to charge and discharge the battery using load variations. This test was conducted in the Energy Conversion Laboratory using a unit of hybrid system equipment produced by KTENG (Korea Technology). The method employed involves charging the battery with energy generated from the hybrid system and discharging it using variations in lamp load. The results of this study indicate that the time needed to charge the battery is 21.28 hours in slightly cloudy weather with a total current of 4.7 amperes, and the battery discharge reaches 200 hours using a 10-watt load. Hybrid Generator, Battery Charging, and Discharging
Experimental Study of the Performance of a Horizontal Axis Wind Turbine with A Flat Taper Type of 4:5 and an Outer Angle of 25° With Variations in The Number of Blades Anandia, Faranita Putri; Sahid, Sahid; Roihatin, Anis
Eksergi Vol. 21 No. 03 (2025): SEPTEMBER 2025
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v21i03.7110

Abstract

This experimental study investigates the performance of a Horizontal Axis Wind Turbine (HAWT) with a flat taper 4:5 blade design and a 25° exit angle, focusing on the effect of varying the number of blades (6, 9, and 12). The turbine, with a diameter of 1.1 m and blade dimensions of 470 mm length, 110 mm top width, and 137 mm bottom width, was tested at wind speeds of 3 m/s, 5 m/s, 7 m/s, and 9 m/s in a laboratory setting. Parameters such as wind speed, turbine rotation, voltage, and current were measured to analyze system efficiency. The results indicate that blade count and wind speed significantly influence efficiency. The highest efficiency of 12.51% was achieved at 3 m/s with 9 blades, while at 5 m/s, the efficiency peaked at 3.95% with 9 blades. For higher wind speeds (7 m/s and 9 m/s), the optimal efficiency decreased to 2.03% and 0.95%, respectively, both achieved with 6 blades. The study concludes that this turbine design is most effective at low wind speeds (≤5 m/s), making it suitable for regions with similar wind conditions, such as Indonesia. The findings contribute to optimizing blade configurations for small-scale wind energy applications.
Evaluation of the Efficiency and Stability of High-Frequency Inverters Under Varying Load Profiles in Photovoltaic Systems Zahro, Nabila Aida Az; Samaratungga, Langga; Hendrawati, Dwiana; Ferandez, Aggie Brenda; Efendi, Erwan Tri
Eksergi Vol. 21 No. 03 (2025): SEPTEMBER 2025
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v21i03.7111

Abstract

This research undertakes an operational performance analysis of a high-frequency inverter (HFI) within a Solar Power Plant (SPP) system configuration. The investigation prioritizes assessing the effects of pure resistive and mixed resistive-inductive load profiles on its efficiency stability. Experimental findings definitively demonstrate that the HFI inherently maintains superior efficiency stability when operating under purely resistive loads. Conversely, the introduction of varying inductive loads tends to compromise this efficiency stability, inducing significant fluctuations. These results yield crucial recommendations, establishing that HFIs are optimally suited for systems with predominantly resistive loads, thereby contributing to the overall system power efficiency enhancement
Horizontal Axis Wind Turbine Efficiency Optimization Through Tip Radius Modification on 4:5 Flat Taper Blades Sahid, Sahid; Anandia, Faranita Putri; Wattimena, Christopher Johanes Edsel; Pratiwi, Okta Ayu; Tantri, Riris Annisa Tarra; Barid, Muhammad
Eksergi Vol. 21 No. 03 (2025): SEPTEMBER 2025
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v21i03.7112

Abstract

This study aims to investigate how changing the roundness of the back edge of blades affects a 4:5 flat taper wind turbine. Tests used blades with 5 mm, 10 mm, and 15 mm rounded edges, compared to a 5 mm notched blade, across wind speeds from 3 to 9 m/s. The results show the 5 mm rounded edge works best at low wind speeds, with an efficiency of 11.12% at 3 m/s. At higher wind velocities, the 15 mm rounded blade demonstrated superior aerodynamic performance, attaining an efficiency of 1.63% at 7 m/s. The rounded trailing edge improved aerodynamic behavior by minimizing turbulence and enhancing flow stability. Therefore, the optimal edge radius should be determined based on regional wind characteristics, especially for low-speed wind zones typical of Indonesia
Biofuel as a Renewable Energy: Potential, Technology, and Challenges Towards a Sustainable Energy Transition Sandi, Dianisa Khoirum; Atyanta, Ariefanda Irza; Fifalah, Maisa Linta; Rizqi, Fika Ariza
Eksergi Vol. 21 No. 03 (2025): SEPTEMBER 2025
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v21i03.7115

Abstract

Biofuel is a promising renewable energy alternative to reduce dependence on fossil fuels and lower greenhouse gas emissions. This article presents a comprehensive overview of biofuel classification (generation I–IV and physical forms), production technologies (fermentation, transesterification, gasification, pyrolysis), and the applications of bioethanol, biodiesel, and biogas in the transportation, industrial, and power generation sectors. Energy efficiency and environmental impact analyses are conducted using a life cycle assessment (LCA) approach, while national energy policies are examined in the Indonesian context, including the mandatory blending program (B30–B50) and sustainability strategies. While biofuels have significant potential, challenges such as production efficiency, land conflicts, and regulatory consistency need to be addressed for biofuels to truly contribute to the national energy transition
Analysis of the Effect of PWHT on the Corrosion Test of API 5L X65 Material in Submerged Arc Welding Kusminah, Imah Luluk; Anggara, Dika; Wardani, Dianita; Widodo, Eriek Wahyu Restu; Nafi, Maula; Handoko, Lukman; Djati, Anggoro Ludiro; Trianto, Ryo Andika
Eksergi Vol. 20 No. 03 (2024): SEPTEMBER 2024
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v20i03.5828

Abstract

This research discusses the method of making distribution pipes using the Submerged Arc Welding (SAW) welding process, especially for pipes with spiral connections. The material used is API 5L X65. SAW pipes with spiral joints are more commonly used for low-pressure piping systems. However, in certain cases, the production of SAW pipes for Sour Service distribution requires special treatment. Sour Service pipes have a high level of corrosion and residual stress, so Post Weld Heat Treatment (PWHT) is required to prevent Hydrogen Induced Cracking (HIC). HIC occurs due to the absorption and accumulation of hydrogen gas in the metal, causing the formation and growth of cracks, which is also influenced by residual stress. PWHT is applied to reduce residual stress to reduce the risk of corrosion. PWHT is a process to change the structure of the weld metal by heating the metal at a certain temperature and time. This research shows that variations in PWHT temperature produce an average residual stress that is not much different with less difference than 2%, In corrosion testing with the HIC method shows crack evidence but is still satisfactory NACE MR0175 criteria for pipe PWHT temperature variation conditions.
Performance and Gas Emissions Analysis on Four Stroke Diesel Engine with Multi-Feedstock Biodiesel Sa'diyah, Aminatus; Ahmad Anda Aulatama; Hilmy Destiandi Ramadhan; Muchammad Nidhor Fairuza; Enggar Alfianto
Eksergi Vol. 20 No. 03 (2024): SEPTEMBER 2024
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v20i03.5864

Abstract

Biodiesel is one of the alternative fuels used in diesel engines. As the effectiveness of various biodiesel base materials varies, further studies on the effectiveness of biodiesel are needed. This study aims to evaluate the use of biodiesel from various sources as an alternative fuel. The methods in making multi-feedstock biodiesel are esterification and transesterification with palm oil, used cooking oil, and sunflower oil as raw materials. In this research, exhaust gas analysis and performance test on four stroke diesel engine were conducted. The mixture of biodiesel was then mixed with Pertamina Dex as High Speed Diesel (HSD) to produce B20, B35, and B100. The exhaust emission analysis focused on the concentration of (NOx) and (CO) gases at each rotation and load. The test result shows that B100 (100% multi-feedstock biodiesel) is the most optimal and environmentally friendly fuel with the same conditions of maximum load of 4000 watts and maximum rotation of 1400 rpm, NOx levels of 1396 mg/m3 and CO 474 ppm and has high power in all variations. On the other hand, HSD has the lowest gsfc in all variations.
Evaluation of Fill Pack Damage to the Cooling Effectiveness of Counter Flow Type Cooling Tower in the Oil and Gas Industry Roihatin, Anis; Nabila Aida Az Zahro
Eksergi Vol. 20 No. 03 (2024): SEPTEMBER 2024
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v20i03.6347

Abstract

In the oil and gas industry, cooling water is needed to cool various kinds of heat-generating equipment and as a backup water requirement. Cooling water in the industry is usually produced by cooling towers in large quantities. The working principle of the cooling tower by exchanging heat from the hot water of a process with exhaled cold air. There is a cooling tower part called a fill pack and has an important function as a place for heat exchange between water and air. In this research in the oil and gas industry, the cooling tower used is a wet cooling tower type with counter flow flow. The purpose of this study is to determine the current cooling effectiveness of the cooling tower compared to its design data. Calculating the effectiveness of cooling certainly requires water temperature data produced by the cooling tower. The method used in this research is the method of taking water temperature data before and after leaving the cooling tower. The level of cooling effectiveness in the cooling tower will be better if the water temperature produced is cooler than the water temperature when entering the cooling tower.
Case Study on Energy Strategy Concerning Santa Ana Wind Activity Triggering Fires in Southern California Evan, Bah; Al Huda, Luqman; Dianisa Khoirum Sandi; Yusuf Dewantoro Herlambang; Eri Prihatmini; Vita Ayu Aspriyanti
Eksergi Vol. 20 No. 03 (2024): SEPTEMBER 2024
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v20i03.6348

Abstract

Santa Ana winds, which are characterized by their scorching, arid, and forceful surges, significantly exacerbate wildfire hazards in Southern California, extending to 23,000 ha, particularly in the Los Angeles region. The purpose of this study is to examine the correlation between anthropogenic influences and natural climatic phenomena, with a specific focus on the influence of regional energy policies on the frequency and intensity of wildfires. The interaction between the Santa Ana winds and landscapes that are becoming more flammable has become more intensive in recent decades, although they are a natural phenomenon. Inadequately regulated urban expansion, prolonged droughts, and elevated temperatures are the causes of this intensification. Utility companies explicitly link wildfire ignitions during wind events to their energy infrastructure, particularly above-ground power lines. Moreover, the crisis has been further exacerbated by inadequate utility modernization, delayed policy reforms, and limited investment in fire-resilient infrastructure. This study assesses the degree to which regulatory inertia and climate change interact to elevate the likelihood of wildfires by analyzing historical wildfire data, meteorological patterns, and the evolution of California's energy policies. In the face of escalating climatic extremes, the results underscore the urgent need for energy strategies that are forward-thinking and integrated and that prioritize environmental sustainability, conflagration prevention, and resilience.

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