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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
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Investigation of Double Screw Compressor Characteristic based on Experimental in Industry Aulia, Nur Fatowil; Surindra, Mochamad Denny; Su”™udy, Ahmad Hamim; Apriandi, Nanang; Ulum, Muhammad Showi Nailul; Priyoatmojo, Slamet
Eksergi Vol. 19 No. 03 (2023): SEPTEMBER 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i03.5038

Abstract

Large-scale compressed air equipment is the only way to meet the demand for air for production facilities such as the pharmaceutical, automotive, or combustion processes industries. As one of the main driving components in the air compressor system, the double screw determines the reliability and performance of the entire compressed air system. Double screw compressors are a promising option for use in large-scale compressed air systems due to their high efficiency and reliability. The double screw profile has been specially designed to increase compression capability over a period of more than 24 hours with a range of 400 to 385 m3 per hour. The cooling oil works well keeping the compressor temperature constant at around 100 0C, even though there are very active temperature fluctuations. On the working pressure side the compressor as a whole is constant, although there is a significant spike in the dryer pressure. The dryer pressure experienced a significant increase reaching 6.9 Bar in the sixth data collection, while the cooling oil pressure and tank pressure were the same at 6.6 Bar, and the air pressure was 6.3 Bar. The results of observing the performance of compressors during industrial operation have presented the ideal working conditions for double screw compressors reaching 58.4 kJ/kg, while the actual working conditions of compressors are 66.6 kJ/kg. Overall, the average compressor efficiency is 87.81%.
Analysis Of Solar Power Plants With A Capacity Of 100 Wp With Automatic Transfer Switch In The Energy Conversion Laboratory Of Semarang State Polytechnic Suwarti, Suwarti; Aulia, Nur Fatowil; Wahyono, Wahyono; Prasetyo, Budhi; Hendrawati, Dwiana; Hermawan, Baktiyar Mei
Eksergi Vol. 20 No. 02 (2024): MAY 2024
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v20i02.5807

Abstract

Solar energy is one of the renewable energy sourcesby utilizing the sun as its energy source. The planning of thePLTS uses an on-grid system, the system is still connected tothe PLN network. The system is used as a backup forelectricity flow. The system will work automatically when thePLN electricity flow is cut off by utilizing the AutomaticTransfer Switch (ATS) control system. The PLTS was tested bymeasuring the voltage, current, and input and output powerfor 5 days from 09.00-15.00 WIB with data collection every 60minutes. Then calculations were made to determine theefficiency of the PLTS. Calculations were also made of theenergy produced by the panels needed and produced by thelights ideally and actually. The results of the DC voltage andDC current tests on average at a load of 70 Watts produced bythe solar panel were 12.7 V and 2.41 A with a data collectionperiod of 7 hours, producing energy of 214.3 Wh andproducing the highest efficiency of 7.9% and the lowest 4.84%.
Numerical Study Of The Influence Of Air Flow Through Rectangular Elbow 90 ° With Triangle Inlet Body Disturbance Aulia, Nur Fatowil; Faradis, Luke Ezra; Su”™udy, Ahmad Hamim; Safarudin, Yanuar Mahfudz; Mulyono, Mulyono; Hermawan, Baktiyar Mei; Sutanto, Bayu
Eksergi Vol. 20 No. 01 (2024): JANUARY 2024
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v20i01.5440

Abstract

AbstrakThis research is to determine the effect of air flow flowing through a 90 ° square elbow with the additional shape of a triangle inlet disturbance body. Simulations were carried out using the Computational Fluid Dynamics (CFD) method to analyze air flow characteristics and changes in flow patterns due to the presence of additional triangular shapes in the flow channel. Numerical simulations are carried out by taking the 90 ° square elbow geometry as the basic model and adding an additional triangle inlet disturbance body shape to it. The simulation results show that the triangle inlet disturbance body significantly influences the air flow inside the elbow. This effect can increase turbulence producing different pressure and velocity contours along the elbow. The effect of flow velocity on the flow in the elbow results in a higher velocity if the form of disturbance is also greater. This research could provide greater understanding of the influence of additional components on fluid flow in channels with similar geometries, opening up potential applications across a wide range of industries.Keywords”” Air flow simulation, Triangle Disturbance, Pressure, Speed
Performance of Photovoltaic as Pump Drive for Alternator Characteristic Monitoring System Herlambang, Yusuf Dewantoro
Eksergi Vol. 19 No. 03 (2023): SEPTEMBER 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i03.5068

Abstract

The objectives of this research to generate electrical energy by making photovoltaic which utilizes the potential of solar radiation sources to drive the pump. There are 2 monocrystalline solar panels installed with a capacity of 100 Wp. Installation of solar panels at an angle of 7 ° based on geographic location in the Tambakboyo, Ambarawa, -7.263239"(Latitude) South Latitude and 110 °42'06.82 (Longitude) East Longitude. The test is carried out by turning on the pump for 1 hour within a period of time until 7 days. The parameters measured in the test are solar radiation data (W/m ²), voltage (V) and current (A) input from solar panels, battery input voltage, voltage and current input from the inverter, as well as the output voltage and current from the inverter. The results of test obtained the highest efficiency value of 12.854% at a voltage of 12.58 V and a current of 10.4 A.
The Effect of Solar Panel Efficiency Due to Temperature Changes Using Halogen Lamps on Polycrystalline Type Solar Modules Samsurizal, Samsurizal; Makkulau, Andi; Fikri, Miftahul; Afrianda, Rio
Eksergi Vol. 19 No. 03 (2023): SEPTEMBER 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i03.4571

Abstract

Solar panels are a technology that utilizes solar energy to be converted into electrical energy. Solar panel technology can be used to generate electricity on a small scale to a large scale. The performance of solar panels depends on environmental factors, namely solar radiation, and temperature. Environmental factors will reduce the electrical efficiency of solar panels due to the increase in operating temperature of solar panels, the greater the temperature will affect their efficiency. Based on tests conducted on photovoltaic (PV) using halogen with different power, the greater the power value in halogen lamp light, the smaller the efficiency, while the greater the temperature of the solar module, the smaller the efficiency. The greater the increase in temperature, the PV efficiency tends to decrease. Based on the results of the study, it shows a significant correlation that, between PV surface temperature and PV efficiency is inversely proportional. While the effect of temperature on efficiency can be said to be quite influential, where in testing with a 300-watt halogen lamp the error rate or R value is 0.6339, while the 500-watt halogen R value is 0.8493 which means it is more accurate and the effect is quite strong.
Experimental Study Of The Performance Of A 5-Bladed Horizontal Axis Wind Turbine Of NACA 4415 Profile Using Winglets With Winglet Height Variation Mustofa, Rida; Sahid, Sahid; Adiprimaswara, Michael Putra Narendra; Aukad, Muhamad; Pratiwi, Okta Ayu; Sulistyoningtyas, Dian Lestari
Eksergi Vol. 20 No. 02 (2024): MAY 2024
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v20i02.5803

Abstract

Horizontal axis wind turbine is one type ofturbine used to convert wind energy into mechanical energy. Thepurpose of this research is to design, manufacture, test andanalyze the performance of horizontal shaft wind turbine NACA4415 airfoil blades that do not use winglets with those that usewinglet height variations. The stages of this research includepreparation of literature search, planning and making NACA4415 airfoil blades both using winglets and not using winglets,assembling test equipment and assembling wind turbineinstallations, testing and taking wind turbine performance data,data processing and analysis, final results. The turbine diameterused is 1.1m with a blade thickness of 18 mm and a chord lengthof 38mm. Tests were carried out with winglet height testvariables of 5%, 7%, 9%, and 11% of the rotor length at windspeeds of 4 m/s, 6 m/s, 8 m/s and 10 m/s. The test results showthat the NACA 4415 airfoil horizontal shaft wind turbine usinga winglet with a height of 7% has optimum performance at 4 m/sand 6 m/s with efficiencies of 23.68% and 8.75%, respectively,while when the wind speed is 8 m/s and 10 m/s the optimumturbine performance is achieved when using a 9% winglet withefficiencies of 6.12% and 3.64%, respectively. The mostoptimum turbine performance improvement is achieved whenusing a 7% winglet with an efficiency increase of 204.76% at awind speed test of 4 m/s. Keywords”” HAWT,
Prototype of Electrical Power Breaker Automation ON PHB-TR Using Microcontroller-Based IOT For Flood-Prone Areas Kusuma Wardhany, Arum; Setya, Hilman Luthfi; Kamil, Ikhsan; Efendi, Erwan Tri
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.v21i02.6497

Abstract

The flood disaster caused losses for PT PLN consumers whose areas were flooded. To prevent electric shock accidents due to flooding, PT PLN took steps to extinguish distribution substations whose areas were affected by flooding. This step was taken to maintain the safety of the flood-affected community from being electrocuted, but this resulted in a loss for PT PLN, namely the selling kWh that was not distributed. In this study, the method used is research and development, where the author makes an idea to overcome the problem of the length of power outage due to flooding by making a PHB-TR Control Prototype for Distribution Substations. Where this prototype is an innovation to replace the main switch on the PHB-TR with MCCB and MCB which are applied in the box panel. With this prototype, PT PLN officers can speed up the process of blackout areas experiencing flooding quickly by controlling the MCCB and MCB at the PHB-TR distribution substation from the PLN office, but still maintaining the reliability of the 20 kV Medium Voltage Network. This prototype is based on the Internet of Things that can be controlled remotely using the Blynk application that can be operated from smartphones and computers. This prototype design is expected to help PLN officers to cut off the PHB-TR load from the PLN office or remotely, as well as some of the benefits that PT PLN can receive from this tool innovation, namely saving kWh that is not channeled and a positive image for PT PLN will be maintained by maintain the reliability of the electrical distribution system.
Challenges and Solutions in Hydropower: Analyzing Francis Turbine Performance and Operational Dynamics Mochamad Denny Surindra; Baktiyar Mei Hermawan; Suwarti; Slamet Priyoatmojo; F. Gatot Sumarno
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.v21i02.6592

Abstract

This paper addresses the global challenge of sustainable energy, exploring alternatives to dwindling fossil fuels and rising CO2. While renewables like solar and wind offer potential, they face geographical and intermittent limitations. Thermal and nuclear energies are discouraged due to severe environmental and health impacts. Hydropower emerges as a highly reliable and favored global solution, harnessing energy from flowing water, tides, and dams. It's the most prevalent renewable source for electricity, offering consistent, dependable, and emission-free supply. The Francis turbine is crucial to hydropower, known for its high efficiency. Its spiral casing, runner, and guide vanes efficiently convert water's energy into electricity. Water flows from a reservoir to the turbine, where guide vanes regulate entry to the runner, driving a generator. Our analysis reveals key factors affecting hydropower performance: energy source, guide vane opening, servomotor performance, and governor control system. Sediment accumulation at the inlet causes head loss, reducing optimal output. Misaligned guide vane openings can drop rotational speed, leading to suboptimal load. Servomotor issues like wear also require maintenance. A 5% speed drop setting effectively manages water pressure and flow, enabling smooth load escalation.
Heat Source in a Pyrolysis Reactor Design for Energy Converting of Polypropylene into Fuel Oil at PPSDM Migas, Cepu Mulyono, Mulyono; Roihatin, Anis; Mukti, Reka Handoyo; Aulia, Nur Fatowil; Huda, Luqman Al
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.v21i02.6843

Abstract

Furnace-02 at PPSDM Migas is utilised in the petroleum processing of residual fuel. The efficiency value of furnace-02 is 62.71%, with 119,1763 Btu/h of heat being wasted through flue gas and a flow velocity of 164 m3/min. The heat value in the flue gas is utilised for the purpose of pyrolysis of the plastic, with a view to optimising energy use in the furnace. The process of plastic pyrolysis has been demonstrated to yield pyrolysis oil, which possesses a calorific value comparable to that of gasoline (10,520 kcal/kg). This pyrolysis oil has the potential to serve as a substitute fuel source for fossil fuels. The design of the pyrolysis system burner modification is such that its capacity is 75 kg/hour. The energy utilisation in the design amounted to 28,645.02 kJ/h, representing 2.3% of the total flue gas heat.
Development of a MATLAB GUI Application for Computing Reliability Indices at an Electrical Substation Fajri, Amrisal Kamal; Efendi, Erwan Tri; Evan, Bah; Prihatmini, Eri
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.v21i02.6844

Abstract

The reliability of power distribution systems plays a crucial role in ensuring the continuous and efficient supply of electricity to consumers. This study presents the development of a MATLAB-based Graphical User Interface (GUI) application designed to compute key reliability indices, including SAIFI (System Average Interruption Frequency Index), SAIDI (System Average Interruption Duration Index), and CAIDI (Customer Average Interruption Duration Index), specifically for electrical substations. The application was developed using MATLAB's App Designer and structured to provide an intuitive and interactive user experience. Real operational data from a 150 kV substation were utilized to test and validate the application’s functionality. The results demonstrate that the tool effectively simplifies the reliability analysis process, reduces calculation time, and minimizes the potential for manual errors. This application can serve as a practical support system for engineers and researchers in evaluating and improving the performance of electrical distribution systems.

Page 24 of 26 | Total Record : 260

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