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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 256 Documents
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Statistical Process Control And Analytical Hierarchy Process Methods For Reducing Earth Resistance Wahyono, Wahyono; Aulia, Nur Fatowil; Hermawan, Baktiyar Mei
Eksergi Vol. 19 No. 2 (2023): MAY 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i2.4477

Abstract

Security or protection systems at generators, substations, transmission, and housing and others, especially to overcome lightning disturbances and leakage currents, the earthing system must meet the required standards. For each part of the system, from transmission, substation and residential electricity utilization as well as other parts, the standard of earth resistance is not the same, for example for housing a maximum of 5 Ω, for a small generator system a maximum of 10 Ω, for a large generator a maximum of 20 Ω and so on etc. In areas where the soil type resistance is high, it is necessary to reduce the value of the earth resistance so that it reaches the Indonesian national standard. There are many ways to reduce the value of earth resistance, including lowering soil resistivity, adding electrodes to the soil, changing the type of electrode and its diameter, and so on. The aim of the research was to determine the effect of the value of earthing resistance on the depth of electrode planting and the type of soil that is affected by the water content in the soil and to apply simple statistical tools, namely Statistical Process Control (SPC) and Anlytical Hierarchy Process (AHP).The measurement method in this research uses a three-point system, namely one point for the test electrode and two points for the auxiliary electrode and the measuring instrument used to measure earth resistance is a digital earth resistance tester type digital model 4105A. This tool is designed according to international electrical commission (IEC) standards. To analyze reducing earth resistance using Statistical Process Control (SPC) and Analytical Hierarchy Process (AHP) methods. The design of this research is to answer the problems and research objectives that have been planned, namely to determine the effect of soil type on earth resistance and to analyze efforts to reduce the value of earth resistance to achieve standards with statistical process control (SPC) and analytical hierarchy process (AHP) methods. To find potential causes, it is done by calculating the analytical hierarchy process (AHP) in order to obtain a sequence of problems to be solved. If the consistency ratio value is more than 10%, then the data judgment must be corrected, but if the consistency ratio is less than or equal to 10% then the calculation results are declared correct or accepted. From the results of the AHP calculation, it is then verified by testing the earth resistance.
Analysis of the Effect of Battery Voltage Drop on Light Intensity on LED and Hologen Type Main Lights in Gentayu UNDIP Electric Cars to Get Good Lighting Setiyawan, Trio; Kristiawan, Timotius Anggit
Eksergi Vol. 19 No. 2 (2023): MAY 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i2.4439

Abstract

Abstrak - The Gentayu UNDIP electric car requires a lighting system, especially the main lighting system, namely the headlights which must have sufficient light but must be economical in power consumption, because the power used uses a battery that is separate from the main battery for propulsion. So that with a separate battery, the available power is limited, for charging the battery a separate mechanism is made and it can be charged simultaneously with charging the main battery for the Gentayu UNDIP electric car. we will try to do a special analysis of the intensity of light in the lighting system of the main lighting system, to get data on the effect of battery power on light intensity. The test was carried out by observing the decrease in light intensity on two types of lamps, namely LED lamps and halogen lamps. 1x10 Lux every 15 minutes with an average voltage drop of 0.06 volts for every 15 minutes. Meanwhile, for halogen type lamps, the average decrease in light intensity is 6x10 Lux every 15 minutes with a voltage drop of 17 volts, so even though the use of LED type lamps has low power consumption in its use, but a decrease in light intensity when used for a long time cannot be avoided, so it is necessary to make a mechanism for the Gentayu UNDIP electric car so that the battery voltage is maintained when the lighting electrical system is used.  
Characteristics of the Savonius turbine to variation angles Su'udy, Ahmad Hamim; Prasetiyo, Budhi; Aulia, Nur Fatowil; Surindra”¬, ”ªMochamad Denny; Safarudin”¬, ”ªYanuar Mahfudz; Sutanto, Bayu
Eksergi Vol. 19 No. 2 (2023): MAY 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i2.4476

Abstract

Wind energy is a form of energy that can be converted into electrical energy using a wind turbine. Based on the axis of rotation, wind turbines are of two types, namely horizontal axis wind turbines and vertical axis wind turbines. Wind turbines with a vertical axis have several types including Darrieus wind turbines, Savonius wind turbines, and H wind turbines. The purpose of this manufacture and test is to determine the effect of wind speed and system efficiency from the Savonius 8 blade wind turbine with variations in the angle of attack on wind speed. certain. Based on the test results, it can be seen that the highest generator power value is at a wind speed of 6 m/s worth 3.85 Watt with an angle of attack of 20 ° and a load of 1 DC lamp, a wind speed of 7 m/s worth 5.58 Watt with an angle of attack   f 0 ° and a load 3 DC lamps, wind speed of 8 m/s worth 8,52 Watts with an angle of attack of 5 ° and a load of 4 DC lamps. While the highest system efficiency value is obtained at a wind speed of 6 m/s worth 4,62 % with an angle of attack of 20 ° and a load of 1 DC lamp, a wind speed of 7 m/s worth 4,218 % with an angle of attack of 0 ° and a load of 3 DC lamps, wind speed 8 m/s worth 4,31 % with an angle of 5 ° and a load of 4 DC lamps.
Utilization of Welding Electrode Waste To Purify Biogas From Hydrogen Sulfide Impurities Kristiawan, Timotius Anggit; Apriandi, Nanang; herlambang, Yusuf Dewantoro; Setiyawan, Trio; Wibowo, Andryana Dwiandara
Eksergi Vol. 19 No. 2 (2023): MAY 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i2.4451

Abstract

Abstract”” The biogas desulphurization process has a crucial role in the widespread use of biogas due to the toxic and corrosive nature of the element hydrogen sulfide on equipment. This study investigated the potential use of waste welding electrodes as a biogas purification medium. Variables in the form of feed biogas flow rates of 1, 2, and 3 liters/minute were studied for their effects. As a result, the most optimum performance was obtained in the test with a feed biogas flow rate of 1 liter/minute, with an average reduction percentage of hydrogen sulfide content in the biogas of 27.12%.
Shell and Tube Heat Exchanger Design: Utilization of Wasted Energy in Air Conditioning Systems Apriandi MS, Nanang; Herlambang, Yusuf Dewantoro; Alfauzi, Abdul Syukur; Lee, Shun-Ching
Eksergi Vol. 19 No. 2 (2023): MAY 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i2.4461

Abstract

This research aims to design a simple Shell and Tube (one pass) heat exchanger for applications in recovering wasted heat from air conditioning systems in the hospitality industry. The Tubular Exchanger Manufacturers Association (TEMA) standard is used as a reference in the design of heat exchangers in order to obtain the dimensional specifications of the device. In addition, mathematical calculations based on the technical properties of the working fluid are carried out with the help of the Microsoft Excel application to obtain values from other parameters in the design. The results showed that the designed heat exchanger met the standards in terms of device effectiveness. The heat exchanger has 152 tubes with an effective value of more than 90% with an impurity factor of 0.014. A high tool effectiveness value indicates a good heat exchanger performance. The results of this planning and design are expected to be a reference in designing an effective heat exchanger with high reliability.
Design And Simulation Of Solar Power Generation On Rooftops Towards Clean Technology Samsurizal, Samsurizal; Pasra, Nurmiati; Adewijaya, Shidarta Rico
Eksergi Vol. 19 No. 2 (2023): MAY 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i2.4467

Abstract

Various efforts are continuously being encouraged and pursued in order to achieve the clean energy transition program. The clear goal is to reach a renewable energy mix target of 23% by 2025. The use of electrical energy is increasing each year, but the availability of fossil energy as the majority fuel used in power generation is becoming limited. Indonesia, being located near the equator, experiences high solar radiation intensity. This potential can be utilized for harnessing solar energy as a power source. Additionally, the utilization of solar energy as an alternative source is more environmentally friendly as it reduces emissions from fossil fuel-based power generation. In this research, the design and planning of a solar power plant are conducted to create clean and environmentally friendly energy. The technical aspects are discussed and simulated using software. The author utilizes the Helioscope application for analyzing the feasibility of installing a solar power plant and conducting simulations. Based on the research results, by utilizing a roof area of 13,725 m2 and installing 2,305 solar modules with a capacity of 550 Wp per module, the solar power plant's capacity amounts to 1,267.8 kWp. The performance ratio is calculated to be 80.6%, and the energy production over a year is estimated at 1,695,000 MW.
FRONT MATTER EKSERGI JURNAL TEKNIK ENERGI Eksergi, Eksergi
Eksergi Vol. 19 No. 2 (2023): MAY 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i2.4507

Abstract

Effect of variations fuel heating on fuel consumption for the Suzuki SJ410 engine Safriana, Eni; Nailul Ulum, Muhammad Showi; Indrawati, Ragil Tri; Putri, Farika Tono
Eksergi Vol. 19 No. 2 (2023): MAY 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i2.4471

Abstract

AbstractMeans of transportation is one of the needs to make the movement from one place to another. One of the commonly used transportation is motorized vehicles that run on gasoline. Fuel consumption affects the power generated as well as the costs incurred and the time required by motorized vehicles to carry out their functions. This research method uses true experimental design research to conduct performance tests using a Suzuki SJ410 motorized vehicle with an F10A type engine and a capacity of 970 cc.  The test was carried out by carrying out the treatment of heating premium fuel through a copper pipe that was installed on the radiator upper tank with a length of 450 mm (MOD 1) and 900 mm (MOD 2) and also under standard conditions (STD). The results obtained stated that fuel consumption under standard conditions (STD) fuel consumption for 26.03 s/50 ml, for a pipe length of 450 mm (MOD 1) for 31.90 s/50 ml and for a pipe length of 900 mm ( MOD 2) for 33.27 s/50 ml.    
Study of solar power plants as an aerator driver based on the Internet of Things (IoT) Margana, Margana; Wahyono, Wahyono; Hermawan, Baktiyar Mei; W, Wiwik Purwati; Suwarti, Suwarti; Aulia, Nur Fatowil; Solikhin, Akhmad Riadzus
Eksergi Vol. 19 No. 2 (2023): MAY 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i2.4479

Abstract

The use of solar power plants is now developing, for example aerator drives with the Internet of Things. The purpose of designing aerators with the Internet of Things is to utilize programming instructions that each command can generate interaction with fellow devices and connect automatically without user intervention, even remotely. This research method begins with the study of literature, manufacture, installation of components, as an analysis carried out testing and data collection. The results of the tests conducted on day 5 include, the best solar radiation intensity power of 886.786 W/m2, the power produced by solar cells of 473.099 W and aerator power of 75.843 W, solar panel efficiency of 14.749%. and PLTS system efficiency of 4.275%. In this test, it was found that the addition of aeration can increase oxygen concentration and pH value of water.                                                                Keywords- Aerator, PLTS, Performance      
Design and Analysis of Venturi Microbubble Generator Using Computational Fluid Dynamics Thoharudin, Thoharudin; Sunardi, Sunardi; Yudha, Fitroh Anugrah Kusuma; Nadjib, Muhammad; Nugroho, Arif Setyo
Eksergi Vol. 19 No. 2 (2023): MAY 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i2.4305

Abstract

The necessity for dissolved oxygen in water is crucial for the survival and growth of aquatic organisms, particularly tilapia. Seventy-five percent of tilapia will die if there is insufficient dissolved oxygen in the water. This work seeks to develop a venturi bubble-generating technique to combat the scarcity of dissolved oxygen in the water. A floating pump with a capacity of 12 m3/hour was selected as the medium for distributing water and generating vacuum pressure to draw in air for mixing with the water flow in the venturi. Ansys Fluent was used to model piping and venturi systems. The piping system was modeled with a single-phase (water) flow at a steady state, whereas the flow in the venturi was modeled with a multiphase (air and water) flow under transient situations. The simulation findings revealed that the pressure drop at the 90-degree elbow was much greater (27.17 kPa) than that at the 45-degree elbow (16.53 kPa). A 1-inch input diameter venturi produced bubbles with an average diameter of 105 µm, whereas a ½  inch venturi bubble generator produced bubbles with an average diameter of 83 µm. Owing to the numerous advantages of adopting a six-outlet piping system with a ½ inch venturi, this design is recommended for floating pumps with a capacity of 12 m3/h.

Page 22 of 26 | Total Record : 256

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