Journal of Energy Systems最新文献

{"title":"Structural design and testing of pouch cells","authors":"Aluru Vamsi̇, Jamal Ansari, Sun Mk, C. Pany, Bibin John, Aiswarya Samri̇dh, T. D. Mercy","doi":"10.30521/jes.815160","DOIUrl":"https://doi.org/10.30521/jes.815160","url":null,"abstract":"","PeriodicalId":52308,"journal":{"name":"Journal of Energy Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47947648","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 feasibility analysis of a solar PV array installation during the construction of high-rise residential buildings","authors":"V. Boddapati, Avinash Sree Ram Nandikatti, S. A. Daniel","doi":"10.30521/jes.811978","DOIUrl":"https://doi.org/10.30521/jes.811978","url":null,"abstract":"","PeriodicalId":52308,"journal":{"name":"Journal of Energy Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43039971","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 the effect of preparation parameters on thermal conductivity of metal oxide nanofluids using Taguchi method","authors":"N. Mane, Vadiraj Hemadri","doi":"10.30521/jes.872530","DOIUrl":"https://doi.org/10.30521/jes.872530","url":null,"abstract":"","PeriodicalId":52308,"journal":{"name":"Journal of Energy Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49528547","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":"Is exergy destruction minimization the same thing as energy efficiency maximization?","authors":"B. Kilkis","doi":"10.30521/jes.938504","DOIUrl":"https://doi.org/10.30521/jes.938504","url":null,"abstract":": This paper discusses whether the exergy destruction minimization or energy efficiency maximization comes first in resolving the climate emergency problem and provides sustainable solution options regarding the 2 nd Law of thermodynamics. It has been shown that low-temperature district energy systems with renewable energy sources and waste heat are effective in minimizing exergy destructions, while energy efficiency has a secondary impact. The research has been based on the Rational Exergy Management Model. The corresponding rational exergy management efficiency was directly related to nearly-avoidable CO 2 emissions responsibility with a global magnitude of around 80% of direct emissions in the built environment. One conclusion deduced from such an unrecognized magnitude so far is that nearly-avoidable CO 2 emissions may not be ignored anymore to develop new strategies for sustainable decarbonization, while the 1 st Law measures have limited remaining capabilities. New equations were developed to show the impact of exergy destructions on total CO 2 emissions. Sample results show that a 30 percent-point decrease of exergy destructions comparing to the supplied exergy in thermo-mechanical systems has the potential of reducing total CO 2 emissions by 35%. The paper argues that current exergy destruction is around 0.8 of the supply exergy, as an industry average, which gives ample room for improvement using the 2 nd Law, while the 1 st Law efficiency is already higher, and there is less room available for improvements concerning CO 2 emissions. The paper shows that the 1 st Law efficiency may be increased by about 0.15 points, which gives a window of opportunity about a 25 percent-point decrease in emissions. The second main conclusion is that nowadays, new decarbonization strategies are needed based on the 2 nd Law, which will positively impact when coupled with the current 1 st Law measures towards meeting the Paris agreement. These results show that even in a simple solar flat plate collector, the number and type of useful applications arranged in tandem, like further use of the remaining heat in preheating the municipal water supply instead of wasting the heat, is important about exergy-based high rationality. In a holistic view,  CO 2 may be related to exergy rationality, ψ R . From Equations 6-a and 6-b, and ψ R ~ε dem /ε des , for all cases, Equation 8 is derived.","PeriodicalId":52308,"journal":{"name":"Journal of Energy Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43450455","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":"Numerical approximation of the hydrological time of concentration","authors":"J. R. Fernández, C. Calvo-Jurado","doi":"10.30521/jes.823017","DOIUrl":"https://doi.org/10.30521/jes.823017","url":null,"abstract":"The time of concentration, that is the time it takes for a single \"drop of water\" to move superficially from the most distant point of the watershed to the exit point, is a fundamental parameter of the hydrological analysis. Many studies have been conducted to propose empirical formulas to calculate the time of concentration. One of the best known is the Temez formula based on time series data collected in accounts in Spain with areas of less than 3,000 km. This expression uses the main channel length as a parameter as in many works, for small slopes is approximated by the distance between the geographic coordinates between the starting and ending points, leading for larger catchments and slopes to approaches with a high error. In this work, using a proper discretization of the curve, by using polynomial interpolation methods, we improve the calculation of the length of the main channel and therefore, we provide a more reliable method for calculating the time of concentration using the Temez expression. We illustrate the proposed scheme with different numerical examples comparing the results with those provided by other methods.","PeriodicalId":52308,"journal":{"name":"Journal of Energy Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42353625","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":"Numerical investigation of influence of cross-sectional dimensions of flow channels on PEM fuel cell performance","authors":"Mahmut Kaplan","doi":"10.30521/jes.871018","DOIUrl":"https://doi.org/10.30521/jes.871018","url":null,"abstract":"Proton exchange membrane fuel cell (PEMFC) has acquired increasing importance because of operating at higher efficiency and producing environmentally friendly power at low temperatures over the past decade. Flow channel as a vital part of PEMFC plays a critical role for augmenting the performance of PEMFC. In this paper, a single phase, 3-D model is generated to examine impact of the channel cross-section geometry on the cell performance. 15 different simulation cases were gained by altering the flow channel width and depth from 0.2 to 1.6 mm for the fixed depth and width of 1 mm, respectively. In the base case, the channel dimensions are 1.0 mm width and depth. The results revealed that decreasing depth and width of the channel enhanced the current density thanks to increasing gas velocity in the flow channels of the anode and cathode at the expense of increased pressure drop. The cases having the channel cross-sectional dimensions of 0.2 x 0.1 mm and 0.1 x 0.2 mm (channel width x depth) enhanced the current density about 57% and 45% at 0.4 V compared to the base case. Besides, oxygen consumption and water production in the cathode side are also remarkably increased in these cases. However, the channel cross-sectional size of 0.8 x 1 mm case which increases the current density 2.5% at 0.4 V in comparison with the base case can be best option by taking into consideration pressure drop into the flow channels.","PeriodicalId":52308,"journal":{"name":"Journal of Energy Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42221358","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":"Renewable energy development in rural areas of Uttar Pradesh: Current status, technologies and CO2 mitigation analysis","authors":"Akanksha Sharma, H. Singh, R. Viral, N. Anwer","doi":"10.30521/jes.816049","DOIUrl":"https://doi.org/10.30521/jes.816049","url":null,"abstract":"The main factor having severe impact on lives of millions of people under the poverty line is energy deficiency. For the improvement of living and standard of education, there is a need to electrify the rural areas. India has an aim of achieving 175 GW of renewable energy capacity by 2022. The use of Renewable Energy Technologies propounds huge benefits to rural areas. Over the past two decades, rural electrification has been a continuous process, accelerated through various programs and schemes. Uttar Pradesh state of India, located in the north central region of the country is the most populous state. Energy demand is increasing steadily with the development of the state. With respect to limited conventional energy sources and increasing environmental pollution, production of energy based on renewable energy sources is given high priority. This paper presents the current status of renewable energy in the state, renewable energy-based options for rural electrification including the single technology-based systems, integrated and the hybrid energy systems depending on availability of resources. The current scenario of power generation and requirement is also discussed. A complete analysis of the current CO2 emission and the mitigation potential of different RESs are presented. Based on this the cost saving potential is performed.","PeriodicalId":52308,"journal":{"name":"Journal of Energy Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45062751","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":"Evaluation through finite element and numerical simulation of triboelectric polymer pairs in vertical contact mode","authors":"S. Shafeek, Sibgatulla Sharieef Sharieef","doi":"10.30521/JES.847237","DOIUrl":"https://doi.org/10.30521/JES.847237","url":null,"abstract":"Triboelectric nanogenerators are shown a recent development in the energy field in various applications powering sensors to biomedical applications. The research development of tribogenerators is trending in the renewable energy area as it can harness waste mechanical energy due to the friction. Studies have shown various mathematical modeling done on the triboelectric principle based on Gauss electric field principle. Triboelectricity generation due to contact electrification depends on various factors that include the surface charge density, materials, the geometrical features of the tribo pairs, the mode of operation in terms of velocity etc. The significance of nanomaterials in the generation of triboelectricity is a research area where polymers have shown good results. In this study, a detailed computational and numerical simulation is done on selected pairs of triboelectric material combination chosen from the triboelectric series. Computational simulation is performed using Comsol Multiphysics to evaluate the output performance in terms of Voc and Qsc. Numerical simulation is performed using MatLab to evaluate the output performance current, power, voltage with respect to time for selected input parameters. The numerical performance of the device is validated by the experiments. The numerical method adopted will be a useful tool for determining the output characteristics of any triboelectric pairs.","PeriodicalId":52308,"journal":{"name":"Journal of Energy Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44905964","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":"Dynamic analysis of a tri-floater with vertical axis wind turbine supported at its centroid","authors":"Asadulla Thoppil, M. Akbar, D. Rambabu","doi":"10.30521/JES.811097","DOIUrl":"https://doi.org/10.30521/JES.811097","url":null,"abstract":"The paper deals with the dynamic analysis of a tri-floater with a 1 MW offshore Vertical Axis Wind Turbine (VAWT) placed at its centroid. Six line catenary mooring system was used for controlling the horizontal movement of the floater. The floater was modeled as a rigid body with six degrees of freedom. Mass, damping and hydrostatic stiffness were calculated by using hydrostatic stability condition. The aerodynamic load on Vertical Axis Wind Turbine was calculated via the stream tube theory. Wave profile was calculated using Airy’s wave theory followed by the use of Morison’s equation to determine the inertial and drag forces on the floater. A computer program was developed by using the MatLab package for force calculation including wind and wave excitations as a dynamic analysis. The Newmark beta method was performed for these analyses. The equation of motion for the floater was solved in time domain. Restoring force by mooring lines at each instant of time was calculated based on the cable profile. Responses of the tri-floater with VAWT in different sea conditions were analyzed. It was proven that surge, heave and pitch are the predominant motions for a straight (00) wave. These motions were also analyzed for the waves with different inclinations and their responses were also considered and compared.","PeriodicalId":52308,"journal":{"name":"Journal of Energy Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44825398","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":"Low density hemp shive particleboards for latent thermal energy storage performance","authors":"Edgars Kirilovs","doi":"10.30521/JES.805791","DOIUrl":"https://doi.org/10.30521/JES.805791","url":null,"abstract":"Over the past few decades, climate change and the search for renewable energy sources have become hot topics within the research community. About 30% of the world's energy consumption is in the heating and cooling sector of residential buildings. Such materials can reduce the temperature variations, leading to an improvement in human comfort and decreasing at the same time the energy consumption of buildings. This paper assesses the integration of a microencapsulated phase change material (PCMs) with organic composite phase change as the core material and melamine-formaldehyde as the shell in hemp shive intended for building indoor wallboard. Paraffin waxes are cost-effective and have moderate thermal energy storage density but low thermal conductivity and, hence, require large surface area. Commercial manufactured organic PCM-S28 with a 25-29°C melting point received from MikroCaps Ltd. (Slovenia) has been used. The experimental boards were made using cold pressing technology and with 10% Kleiberit Urea Formaldehyde resin (UF) glue as a binding agent. The experimental boards were made 25 mm thick with a density of 310 ± 20 kg/m3 that qualify them as low-density boards. By adding 5% nanocapsules during the board manufacturing process, the heat capacity is increased by 28%.","PeriodicalId":52308,"journal":{"name":"Journal of Energy Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46226715","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}