2022 8th International Conference on Energy Efficiency and Agricultural Engineering (EE&AE)最新文献

{"title":"Portable on-site testing system for hydrokinetic turbines","authors":"R. Chihaia, G. Cîrciumaru, Tanase Nicolae, A. Voina, L. El-Leathey, C. Dumitru","doi":"10.1109/eeae53789.2022.9831355","DOIUrl":"https://doi.org/10.1109/eeae53789.2022.9831355","url":null,"abstract":"This paper describes the development and preliminary testing of a portable on-site testing system suitable for hydrokinetic turbines. In order to estimate the power produced by a full-scale hydrokinetic turbine in prototype phase, it is necessary to study several similar models on a progressive scale and to test them on dedicated benches, in laboratory conditions. The characterization of increased diameter rotors requires larger models that often exceed the test capabilities of the hydraulic laboratory test benches. In this case, testing should be performed on-site, in real operating conditions. In this regard, a specially designed test system that can characterize the hydrokinetic rotors with larger diameters in rivers or channels with significant velocities has to be used. The main advantages of such a testing system are that the rotors are easily swappable, the electronic and electric parts are placed outside the water and there is no need for grid connection, due to low power requirements. Thus, the system can be deployed only by using a laptop and a battery pack, making it suitable for remote areas. The purpose of the experiments described in this paper was to determine the characteristic parameters like power, mechanical torque or power coefficient for hydrokinetic rotors with same geometry but different diameters. This testing method is fast and accurate and contributes to a better understanding of horizontal axis hydrokinetic turbines.","PeriodicalId":441906,"journal":{"name":"2022 8th International Conference on Energy Efficiency and Agricultural Engineering (EE&AE)","volume":"289 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115665873","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 Implementation of a Remote Lab for Investigation of DC Motors","authors":"T. Nenov, B. Evstatiev, S. Kadirova","doi":"10.1109/eeae53789.2022.9831406","DOIUrl":"https://doi.org/10.1109/eeae53789.2022.9831406","url":null,"abstract":"The last two years and the COVID-19 situation showed the need to ensure sustainable engineering education via the use of virtual and remote laboratories. The aim of the article is to design a laboratory model for studying the characteristics of DC electric motors. The implementation is based on different well know solutions, such as Raspberry PI, ESP32, power modules and sensor. The communication is based on the TCP/IP protocol and the control of the power modules is implemented using PWM. The IoT implementation of the lab is based on the Home Assistant platform, which allows monitoring and control of remote devices. The study also presents the schematic diagram of the virtual laboratory system, which allows to explain and substantiate the role and behavior of each component.","PeriodicalId":441906,"journal":{"name":"2022 8th International Conference on Energy Efficiency and Agricultural Engineering (EE&AE)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115708883","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":"Comparative Analysis of Pulse Methods for DC Motor Control","authors":"S. Ivanov, Y. Ivanova","doi":"10.1109/eeae53789.2022.9831324","DOIUrl":"https://doi.org/10.1109/eeae53789.2022.9831324","url":null,"abstract":"In this article comparative analysis of the results of research of two methods for pulse control of a DC brush motor is made. A control circuit with addition of energy in control pulses for the motor anchor winding has been designed. The results of experimental researches of consumed electric power, output mechanical power and efficiency in the conventional method and in the method with addition of energy are presented. It has been realized theoretical analysis of transients in the control pulses for the motor in both control methods.","PeriodicalId":441906,"journal":{"name":"2022 8th International Conference on Energy Efficiency and Agricultural Engineering (EE&AE)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126528499","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":"Efficiency Improvement of Electric and Hybrid Vehicles by Better Utilization of Inertia","authors":"V. Keseev","doi":"10.1109/eeae53789.2022.9831301","DOIUrl":"https://doi.org/10.1109/eeae53789.2022.9831301","url":null,"abstract":"The global climate changes require the setting of high and hard to attain environmental goals and every technological improvement is a step towards achieving them. Transport is one of the biggest polluters. Electric and hybrid cars together with renewable energy sources have the potential to ameliorate the transport ecology, but they still have shortcomings that can be improved. An analysis of the functioning of modern electric and hybrid vehicles, concerning inertia utilization, has been done. The conclusion is that the inertia is not used properly and thus the energy or fuel consumptions deteriorate. Тhe proposed solution has the potential to significantly improve the energy and fuel consumptions of electric and hybrid vehicles, and their operating costs, to extend the expensive battery lives and the run per battery charge of electric vehicles.","PeriodicalId":441906,"journal":{"name":"2022 8th International Conference on Energy Efficiency and Agricultural Engineering (EE&AE)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121572642","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":"Bioconversion of Lemna sp and Nejayote into Biogas as a starting point for agrowaste","authors":"Pabel A. Cervantes-Avilés, Valeria Sanchez-Velazquez, J. Gutiérrez-Uribe, G. Cuevas-Rodríguez","doi":"10.1109/eeae53789.2022.9831230","DOIUrl":"https://doi.org/10.1109/eeae53789.2022.9831230","url":null,"abstract":"Agrowaste has some issues such as management or disposal in the transformation industry of corn and pig farms. Sub-products obtention from waste of both industries can represent an opportunity if processes are technically and economically feasible. In this study, bioconversion of Lemna sp and Nejayote in biogas via anaerobic digestion was evaluated at short term as function of biogas production, as well as chemical oxygen demand (COD) and total solid (TS) removal. Lemna sp was collected from a pond system applied for wastewater treatment of pig farms, while Nejayote, the wastewater generated in the nixtamalization process of corn, was collected in a local corn processing store. Results indicated that the digesters with Lemna sp generated up to 32% higher biogas than that for Nejayote. This is also reflected in the biogas yield obtained, 0.31 L of biogas/ g COD and 0.46 L of biogas/ g COD for Nejayote and Lemna sp, respectively. Regarding biochemical oxygen demand (BOD) removal, the evaluation of the substrates indicated a greater removal of BOD present in the reactors with Lemna sp, reaching an average of 79% of BOD removed in 120 h, for a 37% removal in the reactors with Nejayote. On the other hand, an increase in the concentration of total COD was observed in both substrates, demonstrating the potential solubilization of the particulate material present in both substrates. Although the Lemna sp reactors increased the concentration of TS, a fraction may be attributable to the development of microorganisms typical of anaerobic digestion. On the contrary, in the case of digesters with Nejayote, a decrease in TVS and an increase in COD are observed simultaneously. This could be due to increase is closely related to the hydrolysis of the organic material present in the anaerobic digesters. In general, methanogenic viability were more suitable for the Lemna sp conversion at the conditions applied and the same COD load of both substrates.","PeriodicalId":441906,"journal":{"name":"2022 8th International Conference on Energy Efficiency and Agricultural Engineering (EE&AE)","volume":"294 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124347403","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":"Solar-thermal collector energy optimisation based on optimum input temperature mode","authors":"Talpiga Mugurel Florin, Iordache Florin","doi":"10.1109/eeae53789.2022.9831265","DOIUrl":"https://doi.org/10.1109/eeae53789.2022.9831265","url":null,"abstract":"This paper present a mathematical model to find the optimum input temperature of a solar-thermal collector for a known set of climate data, using solar radiation and external temperature over the hot and cold period of the year. In the study, is presented the mathematical model of solar-thermal collector functionality over the day coupled with a thermal storage tank and a mixing valve, able to prepare the optimal temperature of thermal agent from the system. The optimum temperature of thermal agent at input plug of solar system is evaluated based on solar radiation and temperature of eternal air to take the maximum of renewable energy. In the modeling a prestudy of solar-thermal collector functionality is driven to propose the efficiency and functionality state chart of solar-thermal collector for specific climate data.","PeriodicalId":441906,"journal":{"name":"2022 8th International Conference on Energy Efficiency and Agricultural Engineering (EE&AE)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115332683","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":"Traction Motor Drive of Electrical Vehicle: Types, Performances and Control","authors":"N. Djagarov","doi":"10.1109/eeae53789.2022.9831309","DOIUrl":"https://doi.org/10.1109/eeae53789.2022.9831309","url":null,"abstract":"The development, improvement and use of electric vehicles is one of the fastest growing areas of electrical engineering. This is due to their undoubted qualities and environmental requirements. One of the most important elements of electric cars is the traction motor drive. The article reviews types, performances and control drives. The main parameters, characteristics of electrical drives are considered, indicating their advantages and disadvantages, their use in different types of cars. Particular attention is paid to the methods and means of control of electrical drives, which largely determines the control characteristics of the electric vehicle, their efficiency and their mileage.","PeriodicalId":441906,"journal":{"name":"2022 8th International Conference on Energy Efficiency and Agricultural Engineering (EE&AE)","volume":"188 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115364160","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":"Impact of the method of air suction on the energy efficiency of fan systems","authors":"G. Popov, K. Klimentov, B. Kostov","doi":"10.1109/eeae53789.2022.9831374","DOIUrl":"https://doi.org/10.1109/eeae53789.2022.9831374","url":null,"abstract":"The paper presents methods for improving the energy efficiency of fan systems using elements installed at the inlet of the suction pipe, in order to smoothly reduce the air flow to the relevant pipe sizes. Two cases are studied - when the suction is performed from \"Unlimited space\", as well as from limited space in the presence of a transverse wall. An indicator (coefficient kE) used to quantify the rate of improvement of the system energy efficiency by installing a suction element, evaluating what part is the particular improvement of energy efficiency based on the air suction pressure losses without installing an inlet body for improving suction, has been established. When using a suction cone, it is recommended that the taper angle be about 60o and a relative length L /D of not less than 0.2. Under these conditions, the reduction in inlet pressure losses is up to 0.9 compared to those without a suction cone installed. When using a smooth inlet, it is recommended that the relative radius should be R/D>0.1. For both studied methods of suction (from an unrestricted medium and from a transverse wall) the coefficient kE has values around 0.9.","PeriodicalId":441906,"journal":{"name":"2022 8th International Conference on Energy Efficiency and Agricultural Engineering (EE&AE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129574263","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":"Possibilities for Reduction of Variable Losses in Induction Motors","authors":"M. Hristova, Vyara Ruseva, Anka Krasteva","doi":"10.1109/eeae53789.2022.9831372","DOIUrl":"https://doi.org/10.1109/eeae53789.2022.9831372","url":null,"abstract":"This paper analyses ways of increasing the energy efficiency of induction motors that are related to reducing electrical losses in the stator winding, electrical losses in the rotor winding and additional losses. Techniques employed for reducing the rotor winding resistance with the purpose of reducing the electrical losses are presented. A study of the existing methods for calculating the additional losses in induction motors is conducted and solutions for the reduction of such losses are proposed.","PeriodicalId":441906,"journal":{"name":"2022 8th International Conference on Energy Efficiency and Agricultural Engineering (EE&AE)","volume":"144 9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129614990","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":"Machine Learning for Automation of Warehouse Activities","authors":"V. Hristov, D. Slavov, I. Damyanov, G. Mladenov","doi":"10.1109/eeae53789.2022.9831208","DOIUrl":"https://doi.org/10.1109/eeae53789.2022.9831208","url":null,"abstract":"This paper presents machine learning approaches for automation of activities in warehouses. Integrating machine learning in supply chain management can help automate a number of mundane tasks and allow enterprises to focus on more strategic and impactful business activities. The various machine learning models presented are designed to work with low-cost hardware. The models were studied with different sizes of the input data and the most appropriate ones were selected according to set criteria. Their ability to run on Raspberry Pi single-board computer has been explored and performance characteristics in inference mode have been experimentally established.","PeriodicalId":441906,"journal":{"name":"2022 8th International Conference on Energy Efficiency and Agricultural Engineering (EE&AE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129752863","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}