Eksergi最新文献

{"title":"Pengaruh Suhu dan Waktu Pengeringan Pada Bioplastik dari Pati Jagung Terhadap Waktu Biodegradasi","authors":"Mirra Amanda Syamsyyah, Myra Wardati Sari, Cengristitama Cengristitama, Lulu Nurdini","doi":"10.31315/e.v20i2.9727","DOIUrl":"https://doi.org/10.31315/e.v20i2.9727","url":null,"abstract":"The disposal plastic waste into the environtment is an important issue due to the natureof the origin of plastics that are difficult to decomposes naturally. Therefore, efforts are made to accelerate the degradation time by using natural polymers. Corn is one of the easily found sources of starch. Starch is one of the natural polymres that can be used for the manufacture of biodegradable plastics (bioplastics) because it is easily degradable, readily available and affordable but has shortcomings in mechanical properties and water absorption ability.The purpose of this study was to observe the effect of temperature variations 60; 70; 80 and 90°C with a drying time of 1; 2; 3 and 4 hours of biodegradation time. From this study, the best results were found at a temperature of 60°C with a drying time of 1 hour which obtained a degradation time of 5 days; average thickness 0.12 mm – 0.30 mm; the overall average water absorption is 4.04% and the average water resistance is 95.99%; tensile strength of 5.69 MPa and 5.54 MPa; elongation at break of 4% and 1.6%.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43059529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Kajian Isoterm Adsorpsi Linear Alkilbenzena Sulfonate (LAS) dalam Limbah Cair Detergen Menggunakan Biosorben Ampas Kopi dan Ampas Kelapa","authors":"Mimin Septiani, Zakiya Darajat, Muhammad Arham Yunus, Maria Assumpta Nogo Ole, Zuhrotul Fikri Ilma","doi":"10.31315/e.v20i2.9955","DOIUrl":"https://doi.org/10.31315/e.v20i2.9955","url":null,"abstract":"One of the efforts to minimize the impact of detergent waste pollution is by adsorption using coffee dregs and coconut dregs adsorbents. The purpose of this study was to determine the optimum mass of coffee grounds and coconut pulp as adsorbents, to compare the effectiveness of their absorption in decreasing levels of Linear Alkyl Benzene Sulfonate, and to study their adsorption isotherm models. This research was conducted in batches with variations in the mass of each adsorbent, namely 1 gram, 2 grams, 3 grams, 4 grams and 5 grams. This research was conducted in batches with variations in the mass of each adsorbent, namely 1 gram, 2 grams, 3 grams, 4 grams and 5 grams. The detergent waste samples were contacted with the adsorbent for 30 minutes and then the absorption capacity was tested using the Methylene Blue test method. The results showed that the optimum absorption of LAS content from coffee grounds and coconut pulp adsorbents occurred at a mass of 2 grams with the greatest increase in absorption efficiency index Coconut dregs adsorbent is more effective than coffee dregs because it can absorb up to 37%, while coffee dregs are only 10% with the same adsorbent mass of 5 grams. The adsorption isotherm model of the 2 types of adsorbents refers to the Langmuir equilibrium with R2 values for coffee grounds 0.8651 and coconut pulp 0.9868.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47098937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characteristics of the Savonius turbine to variation angles","authors":"Ahmad Hamim Su'udy, B. Prasetiyo, Nur Fatowil Aulia, ‪Mochamad Denny Surindra‬, ‪Yanuar Mahfudz Safarudin‬, Bayu Sutanto","doi":"10.32497/eksergi.v19i2.4476","DOIUrl":"https://doi.org/10.32497/eksergi.v19i2.4476","url":null,"abstract":"<script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script>","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41620501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of solar power plants as an aerator driver based on the Internet of Things (IoT)","authors":"M. Margana, W. Wahyono, Baktiyar Mei Hermawan, Wiwik Purwati W, S. Suwarti, Nur Fatowil Aulia, Akhmad Riadzus Solikhin","doi":"10.32497/eksergi.v19i2.4479","DOIUrl":"https://doi.org/10.32497/eksergi.v19i2.4479","url":null,"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   ","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44550817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"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","authors":"T. Setiyawan, Timotius Anggit Kristiawan","doi":"10.32497/eksergi.v19i2.4439","DOIUrl":"https://doi.org/10.32497/eksergi.v19i2.4439","url":null,"abstract":"<p><strong>Abstrak</strong><strong> - </strong><strong>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</strong><strong>.</strong><strong></strong></p><p><strong> </strong></p><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script>","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47311067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Statistical Process Control And Analytical Hierarchy Process Methods For Reducing Earth Resistance","authors":"W. Wahyono, Nur Fatowil Aulia, Baktiyar Mei Hermawan","doi":"10.32497/eksergi.v19i2.4477","DOIUrl":"https://doi.org/10.32497/eksergi.v19i2.4477","url":null,"abstract":"<p class=\"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).</p><p class=\"Abstract\">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.</p><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chr","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42678984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and Analysis of Venturi Microbubble Generator Using Computational Fluid Dynamics","authors":"Thoharudin Thoharudin, S. Sunardi, F. Yudha, M. Nadjib, A. Nugroho","doi":"10.32497/eksergi.v19i2.4305","DOIUrl":"https://doi.org/10.32497/eksergi.v19i2.4305","url":null,"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.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44594489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of variations fuel heating on fuel consumption for the Suzuki SJ410 engine","authors":"Eni Safriana, Muhammad Showi Nailul Ulum, R. T. Indrawati, Farika T. Putri","doi":"10.32497/eksergi.v19i2.4471","DOIUrl":"https://doi.org/10.32497/eksergi.v19i2.4471","url":null,"abstract":"<p><strong>Abstract</strong></p><p>Means 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.</p><p><strong> </strong></p><pre> </pre><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script>","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41530640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design And Simulation Of Solar Power Generation On Rooftops Towards Clean Technology","authors":"Samsurizal Samsurizal, Nurmiati Pasra, Shidarta Rico Adewijaya","doi":"10.32497/eksergi.v19i2.4467","DOIUrl":"https://doi.org/10.32497/eksergi.v19i2.4467","url":null,"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.<script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script>","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43577492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shell and Tube Heat Exchanger Design: Utilization of Wasted Energy in Air Conditioning Systems","authors":"Nanang Apriandi MS, Y. Herlambang, A. S. Alfauzi, Shun-Ching Lee","doi":"10.32497/eksergi.v19i2.4461","DOIUrl":"https://doi.org/10.32497/eksergi.v19i2.4461","url":null,"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.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42545583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}