Journal of Energy Systems最新文献

A new capacitive inductive system design for LASER-induced kilotesla magnetic field generation 用于激光诱导千特斯拉磁场生成的新型电容式感应系统设计

Journal of Energy Systems Pub Date : 2024-04-01 DOI: 10.30521/jes.1439709

Ahmet Nuri Akay, Melda Varol, Erol Kurt

引用次数: 0

Efficiency analysis of fixed and axis tracking options of photovoltaic systems to be installed in a marina 拟在码头安装的光伏系统的固定和轴跟踪方案的效率分析

Journal of Energy Systems Pub Date : 2024-02-27 DOI: 10.30521/jes.1345912

H. Şahin

引用次数: 0

Cost optimization of oil type distribution transformer using multi-objective genetic algorithm 利用多目标遗传算法优化油式配电变压器的成本

Journal of Energy Systems Pub Date : 2024-02-26 DOI: 10.30521/jes.1383567

Simay Telli̇, I. Iskender, Emir Yükselen

引用次数: 0

Innovative approaches and modified criteria to improve a thermodynamic efficiency of trigeneration plants 提高热电联产发电厂热力学效率的创新方法和修改标准

Journal of Energy Systems Pub Date : 2024-01-19 DOI: 10.30521/jes.1314441

A. Radchenko, M. Radchenko, S. Forduy, Oleksandr Ri̇zun, Zielikov Oleksi̇i̇, Victor Khaldobin, Victor Si̇chko

{"title":"Innovative approaches and modified criteria to improve a thermodynamic efficiency of trigeneration plants","authors":"A. Radchenko, M. Radchenko, S. Forduy, Oleksandr Ri̇zun, Zielikov Oleksi̇i̇, Victor Khaldobin, Victor Si̇chko","doi":"10.30521/jes.1314441","DOIUrl":"https://doi.org/10.30521/jes.1314441","url":null,"abstract":"Trigeneration plants (TGP) desired for combined production of electricity, heat and refrigeration are highly flexible to follow current loading. But their highest efficiency might be possible only when heat production coincides with its consumption, which is generally impossible in traditional TGP with applying the absorption lithium-bromide chiller (ACh) converting the heat, released from combustion engine in the form of hot water, into refrigeration. Usually, the excessive heat of hot water, not consumed by ACh, is removed to the atmosphere through emergency radiator. However, the well-known methods of TGP efficiency assessment do not consider those heat losses and give the overestimated magnitudes of efficiency for conventional TGP with ACh. The application of booster ejector chiller (ECh), as an example, for utilization of the residual waste heat, remained from ACh and evaluated about 25%, has been proposed to produce supplementary refrigeration for cooling cyclic air of driving combustion engine to increase its electrical efficiency by 3-4 %. In the case of using the supplementary refrigeration for technological or other needs the heat efficiency of TGP will increase to about 0.43 against 0.37 for typical TGP with ACh as example. The new modified criteria to assess a real efficiency of conventional TGP, based on ACh, are proposed which enable to reveal the way of its improvement through minimizing the heat waste. Such combined two-stage waste heat recovery system of TGP can be considered as the alternative to the use of back-up gas boiler to pick up the waste heat potential for conversion by ACh to meet increased refrigeration needs.","PeriodicalId":52308,"journal":{"name":"Journal of Energy Systems","volume":"65 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140503090","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}

引用次数: 0

Identification of Vibration for Balancing in Fehn Pollux Ship with ECO Flettner Rotor 识别采用 ECO Flettner 转子的 Fehn Pollux 船舶的平衡振动

Journal of Energy Systems Pub Date : 2024-01-13 DOI: 10.30521/jes.1255518

Chetan Parmar, Elmar Wings, Farzaneh Nourmohammadi

{"title":"Identification of Vibration for Balancing in Fehn Pollux Ship with ECO Flettner Rotor","authors":"Chetan Parmar, Elmar Wings, Farzaneh Nourmohammadi","doi":"10.30521/jes.1255518","DOIUrl":"https://doi.org/10.30521/jes.1255518","url":null,"abstract":"Flettner rotors are wind propulsion systems using the Magnus effect to generate thrust, thereby reduce fuel consumption and carbon emissions in the ships. However, rotor unbalance can cause excessive vibrations and energy loss, affecting the performance and stability of the system. There is a need to have a system onboard, which can predict the vibrations. The paper proposes a deep learning approach to predict the vibrations and unbalanced forces of a Flettner rotor based on the data of ECO Flettner rotor onboard the vessel MV Fehn pollux. The paper develops two methods to estimate the direction and magnitude of the unbalanced forces using the reading values of the strain gauges. The work also compares two recurrent neural network models, namely Long-short term memory and Gated Recurrent Unit, for vibration prediction and evaluates their performance using Mean Absolute Error and Root Mean Squared Error metrics. The results show that Long-short term memory model outperforms Gated Recurrent Unit model in prediction accuracy and can be implemented on the system onboard to monitor and prevent rotor unbalance. The paper also suggests some possible solutions for automatic self-balancing of the rotor and identifies some areas for future work.","PeriodicalId":52308,"journal":{"name":"Journal of Energy Systems","volume":"14 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139531187","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}

引用次数: 0

Flow characteristics of two-dimensional impinging synthetic jets 二维撞击合成射流的流动特性

Journal of Energy Systems Pub Date : 2023-10-20 DOI: 10.30521/jes.1316559

Michiya Yasumi̇ba, K. Ni̇shi̇be, D. Kang, Kotaro Sato

引用次数: 0

Electromagnetic shielding tests of a permanent magnet generator 永磁发电机的电磁屏蔽试验

Journal of Energy Systems Pub Date : 2023-09-30 DOI: 10.30521/jes.1283885

Mehmet SARIKAHYA, Nihan Merve SARIKAHYA, Erol KURT

引用次数: 0

Development and evaluation of an energy-efficient intelligent infrared heating system for industrial buildings 工业建筑节能智能红外采暖系统的开发与评价

Journal of Energy Systems Pub Date : 2023-09-30 DOI: 10.30521/jes.1198583

Denis CHİKURTEV, Veneta YOSİFOVA, Milena HARALAMPİEVA, Rosen PETROV

{"title":"Development and evaluation of an energy-efficient intelligent infrared heating system for industrial buildings","authors":"Denis CHİKURTEV, Veneta YOSİFOVA, Milena HARALAMPİEVA, Rosen PETROV","doi":"10.30521/jes.1198583","DOIUrl":"https://doi.org/10.30521/jes.1198583","url":null,"abstract":"Energy efficiency is a global problem that has become a top priority for all developed countries in recent years. Limited energy resources and high pollution worldwide have led to an increase in research and development in terms of energy efficiency. In the present work, one of the energy-efficient methods for heating by using infrared sources is focused. The advantages of infrared heaters compared to standard heating sources are underlined. A comparative study of the energy consumed during heating by the most frequently used by the heating systems has been made, and the results of the theoretically calculated power costs are presented. An intelligent system has been developed for the management of the infrared heaters to reduce the consumption of electricity better. The intelligent control system is based on a fuzzy-logic control and an internet of things. Results of simulation experiments of the intelligent system are presented as well as of the application of the system in a real environment. During the experiments, the system successes to control the heaters and to reduce power consumption. The achieved results prove that signal processing and control can improve the performance by using modern sensor systems, thereby additional efficiency can be achieved by using the infrared heating. It is possible to develop different optimization systems and algorithms for increasing the energy efficiency of different heating systems.","PeriodicalId":52308,"journal":{"name":"Journal of Energy Systems","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136278794","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}

引用次数: 0

Thermal analysis of phase change materials storage in solar concenter 相变材料在太阳能聚光中心储存的热分析

Journal of Energy Systems Pub Date : 2023-09-30 DOI: 10.30521/jes.1082104

Sulaiman AL HASHMİ, Mingjie CHEN

{"title":"Thermal analysis of phase change materials storage in solar concenter","authors":"Sulaiman AL HASHMİ, Mingjie CHEN","doi":"10.30521/jes.1082104","DOIUrl":"https://doi.org/10.30521/jes.1082104","url":null,"abstract":"Thermal analysis of high-temperature phase change materials (PCM) is conducted with the consideration of a 20% void and buoyancy-driven convection in a stainless-steel capsule. The effects of the thermal expansion and the volume expansion due to phase change on the energy storage and retrieval process are explored. The used water to fill the void between two different wax paraffin and stearic acid spheres is considered as a potential PCM for concentrated solar power. The charging/discharging process into and from the capsule wall is simulated under different boundary conditions for laminar and turbulent ﬂows. Computational models are conducted by applying an enthalpy-porosity method and volume of ﬂuid method to calculate the transport phenomena within the PCM capsule, including an internal air void. A simplified two-dimensional model of the PCM contained within the spheres is constructed and thermal analyses are performed for the transition from solid to liquid states. Simulated charging process modes are compared with the theory. According to experiments, the temperature distributions from 40-60 mm without and with 60 mm with copper fin have different behavior. The paraffin takes less time than stearic acid for total transformation at a rate of 0.5. The size of the sphere increases over the amount of time and the phase of the sphere to complete changes as stearic acid expands more than paraffin during the transition. Inserting a rectangular fin, that is made from copper into the ball reduces the cycle time and increases output.","PeriodicalId":52308,"journal":{"name":"Journal of Energy Systems","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136344888","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}

引用次数: 0

Modelling and optimization of residual stress induction on laser-worked X12Cr turbine blades 激光加工X12Cr涡轮叶片残余应力诱导建模与优化

Journal of Energy Systems Pub Date : 2023-09-30 DOI: 10.30521/jes.1249912

Festus Oluwadare FAMESO, Dawood DESAİ, Schalk KOK, Dylan ARMFİELD, Mark NEWBY

{"title":"Modelling and optimization of residual stress induction on laser-worked X12Cr turbine blades","authors":"Festus Oluwadare FAMESO, Dawood DESAİ, Schalk KOK, Dylan ARMFİELD, Mark NEWBY","doi":"10.30521/jes.1249912","DOIUrl":"https://doi.org/10.30521/jes.1249912","url":null,"abstract":"The energy and power industry conventionally depends on large-scale turbomachinery to meet the ever-growing global energy demands. However, unplanned in-service failures remain a threat to sustainability with safety and economic consequences. The laser shock surface treatment technique is being considered a competitive alternative in mitigating crack initiation and growth, wear and fatigue of industrial components such as turbine blades. This paper presents the modelling and optimization of laser shock treatment parameters using numerical methods and commercial codes such as ABAQUS® and MATLAB®. Model-based process optimization parameters for the induction of global optimum compressive residual stress distribution in laser-worked Chromium-12 based high strength steel alloy (X12Cr) turbine blade is established, showing parametric combinations of inputs variables within the domain under investigation, yielding maximized CRS outputs. A hierarchy of significance of the input parameters to the laser shock peening process for stress induction has also been put forward as an outcome of this study. The capacity to predict and analyze outcomes before actual treatment of the components is beneficial and imperative to cutting costs, downtimes and other economic losses associated with unplanned failure of these components.","PeriodicalId":52308,"journal":{"name":"Journal of Energy Systems","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136277590","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}

引用次数: 0