Pub Date : 2018-03-01DOI: 10.18178/JOCET.2018.6.2.445
S. A. Kim, J. H. Song, S. Han, Y. Cho
{"title":"An Improved Dynamic Modeling of Permanent Magnet Synchronous Machine with Torque Ripple Characteristics","authors":"S. A. Kim, J. H. Song, S. Han, Y. Cho","doi":"10.18178/JOCET.2018.6.2.445","DOIUrl":"https://doi.org/10.18178/JOCET.2018.6.2.445","url":null,"abstract":"","PeriodicalId":15527,"journal":{"name":"Journal of Clean Energy Technologies","volume":"5 1","pages":"117-120"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87574722","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}
Pub Date : 2018-03-01DOI: 10.18178/jocet.2018.6.2.450
X. Feng
Abstract—Nowadays, the exploration of the ocean energy has become necessary and attracted more and more attention by the researchers all over the world due to the pollution and energy depletion issues caused by the consumption of fossil energies. As designing and hydrodynamic analysis of the energy converters in physical experimental tank are both time consuming and expensive, many researchers have developed numerical wave tanks to investigate the problem of wave and current interacting with the energy converters. In this paper, a numerical wave and current tank of the viscous fluid with constant depth is established based on the Reynolds-Averaged Navier-Stokes (RANS) equations with k-ε turbulence closure scheme. The volume of fluid (VOF) method is applied to accurately capture the water free surface. The wave generation, wave absorption and current absorption are accomplished by using the analytic relaxation approach. Based on the numerical wave and current tank established here, the linear wave and nonlinear wave-current interactions are simulated and analyzed. The result shows that the wave generated by using the analytic relaxation approach has the feature of high quality and stability. The numerical results of the linear wave-current interaction are compared with the analytical solution based on the perturbation method, which shows that the numerical wave and current tank established here is accurate and valid. Finally, the influence of current velocity on the wave parameters and the variation of wave crests with wave slopes for linear and nonlinear wavecurrent interactions are also numerically investigated.
{"title":"Linear and Nonlinear Wave-Current Interactions over Constant Water Depth","authors":"X. Feng","doi":"10.18178/jocet.2018.6.2.450","DOIUrl":"https://doi.org/10.18178/jocet.2018.6.2.450","url":null,"abstract":"Abstract—Nowadays, the exploration of the ocean energy has become necessary and attracted more and more attention by the researchers all over the world due to the pollution and energy depletion issues caused by the consumption of fossil energies. As designing and hydrodynamic analysis of the energy converters in physical experimental tank are both time consuming and expensive, many researchers have developed numerical wave tanks to investigate the problem of wave and current interacting with the energy converters. In this paper, a numerical wave and current tank of the viscous fluid with constant depth is established based on the Reynolds-Averaged Navier-Stokes (RANS) equations with k-ε turbulence closure scheme. The volume of fluid (VOF) method is applied to accurately capture the water free surface. The wave generation, wave absorption and current absorption are accomplished by using the analytic relaxation approach. Based on the numerical wave and current tank established here, the linear wave and nonlinear wave-current interactions are simulated and analyzed. The result shows that the wave generated by using the analytic relaxation approach has the feature of high quality and stability. The numerical results of the linear wave-current interaction are compared with the analytical solution based on the perturbation method, which shows that the numerical wave and current tank established here is accurate and valid. Finally, the influence of current velocity on the wave parameters and the variation of wave crests with wave slopes for linear and nonlinear wavecurrent interactions are also numerically investigated.","PeriodicalId":15527,"journal":{"name":"Journal of Clean Energy Technologies","volume":"71 1","pages":"143-149"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77065650","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}
Pub Date : 2018-03-01DOI: 10.18178/jocet.2018.6.2.449
N. Elsharif, K. Mahkamov
The objective of this paper is to investigate the operation of multi-effect water still coupled to an evacuated heat pipe tube solar collector and small fluid piston energy converter. The solar collector is used to provide heating of the saline water in the still and also to drive the fluid piston converter. This converter operates as a pump to evacuate air from the still and reduce pressure inside the still which would result in the increased saline water evaporation rate. The mathematical model of operation of the proposed water desalination system was developed using a set of equations to describe the mass and energy balance for each stage of the still. A simulation was carried out in Matlab/Simulink environment in order to calculate the distillate productivity and temperatures in all stages of the still. The preliminary results demonstrate that the total productivity of the multi-effect still is strongly affected by the pressure inside the still. Currently, the physical model of the system being assembled on the test rig to validate theoretical results.
{"title":"Multi-Effect Solar Water Still with Evaporation Pressure Self-Reduction Capability","authors":"N. Elsharif, K. Mahkamov","doi":"10.18178/jocet.2018.6.2.449","DOIUrl":"https://doi.org/10.18178/jocet.2018.6.2.449","url":null,"abstract":"The objective of this paper is to investigate the operation of multi-effect water still coupled to an evacuated heat pipe tube solar collector and small fluid piston energy converter. The solar collector is used to provide heating of the saline water in the still and also to drive the fluid piston converter. This converter operates as a pump to evacuate air from the still and reduce pressure inside the still which would result in the increased saline water evaporation rate. The mathematical model of operation of the proposed water desalination system was developed using a set of equations to describe the mass and energy balance for each stage of the still. A simulation was carried out in Matlab/Simulink environment in order to calculate the distillate productivity and temperatures in all stages of the still. The preliminary results demonstrate that the total productivity of the multi-effect still is strongly affected by the pressure inside the still. Currently, the physical model of the system being assembled on the test rig to validate theoretical results.","PeriodicalId":15527,"journal":{"name":"Journal of Clean Energy Technologies","volume":"15 9 1","pages":"139-142"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86657906","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}
Pub Date : 2018-03-01DOI: 10.18178/JOCET.2018.6.2.454
Yu-Wen Su
The goal of Taiwan’s Intended Nationally Determined Contributions (INDCs) was to reduce greenhouse gas (GHG) emissions by 20% and 50% from 2005 to 2030 and 2050, respectively. This aggregated goal was distributed into industrial level in this study in two steps. First, the industrial GHG emissions from consuming coal, petroleum, gas, and electricity in 27 sectors was calculated. Second, a model connecting economic variables, energy demands, and emissions from 1982 to 2014 was built to analyze the effects of reducing GHG emissions. Emitting the highest GHG in Taiwan, the chemical material and product industry was chosen as a case study. The estimated results indicate that marginal costs of reducing 461,967 ton CO2 (1.192%) were decreasing TWD 7,328 million capitals or 22,934 labors, causing the value added decrease by TWD 5,655 million (1%) in the chemical material and product industry. In other words, any investments, whose costs are lower than these marginal costs, are worthy to do.
{"title":"Industrial Effects of Reducing Greenhouse Gas Emissions: A Case Study of Chemical Material and Product Industry in Taiwan","authors":"Yu-Wen Su","doi":"10.18178/JOCET.2018.6.2.454","DOIUrl":"https://doi.org/10.18178/JOCET.2018.6.2.454","url":null,"abstract":"The goal of Taiwan’s Intended Nationally Determined Contributions (INDCs) was to reduce greenhouse gas (GHG) emissions by 20% and 50% from 2005 to 2030 and 2050, respectively. This aggregated goal was distributed into industrial level in this study in two steps. First, the industrial GHG emissions from consuming coal, petroleum, gas, and electricity in 27 sectors was calculated. Second, a model connecting economic variables, energy demands, and emissions from 1982 to 2014 was built to analyze the effects of reducing GHG emissions. Emitting the highest GHG in Taiwan, the chemical material and product industry was chosen as a case study. The estimated results indicate that marginal costs of reducing 461,967 ton CO2 (1.192%) were decreasing TWD 7,328 million capitals or 22,934 labors, causing the value added decrease by TWD 5,655 million (1%) in the chemical material and product industry. In other words, any investments, whose costs are lower than these marginal costs, are worthy to do.","PeriodicalId":15527,"journal":{"name":"Journal of Clean Energy Technologies","volume":"27 1","pages":"165-170"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88517789","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}
Pub Date : 2018-03-01DOI: 10.18178/JOCET.2018.6.2.452
B. R. Tiwari, M. Ghangrekar
Microbial fuel cell (MFC) fabricated using Polyvinyl alcohol (PVA)-Nafion-borosilicate membrane was evaluated for distillery wastewater treatment at three different organic loadings of 2300 mgL (OL-1), 4200 mgL (OL-2) and 6300 mgL (OL-3) under 96 h batch mode of operation. The linear sweep voltammetry (LSV) study of the MFC revealed that anodic activity was enhanced when the amount of metabolite available was higher. The LSV results supported the power output achieved from MFC during polarization. Maximum power density of 4.3 Wm was obtained at substrate loading of 6300 mgL, which was 1.2 folds and 1.6 folds higher than that obtained at OL-2 and OL-1, respectively. Along with power output, MFC was capable of efficiently degrading organic matter present in wastewater in the range of 54.5 % to 64.25 %. Successful reduction of organic matter from distillery wastewater apart from power generation establishes MFC using PVA-Nafion-borosilicate membrane as a suitable low cost technology for real wastewater treatment.
{"title":"Electricity Production during Distillery Wastewater Treatment in a Microbial Fuel Cell Equipped with Low Cost PVA-Nafion-Borosilicate Membrane","authors":"B. R. Tiwari, M. Ghangrekar","doi":"10.18178/JOCET.2018.6.2.452","DOIUrl":"https://doi.org/10.18178/JOCET.2018.6.2.452","url":null,"abstract":"Microbial fuel cell (MFC) fabricated using Polyvinyl alcohol (PVA)-Nafion-borosilicate membrane was evaluated for distillery wastewater treatment at three different organic loadings of 2300 mgL (OL-1), 4200 mgL (OL-2) and 6300 mgL (OL-3) under 96 h batch mode of operation. The linear sweep voltammetry (LSV) study of the MFC revealed that anodic activity was enhanced when the amount of metabolite available was higher. The LSV results supported the power output achieved from MFC during polarization. Maximum power density of 4.3 Wm was obtained at substrate loading of 6300 mgL, which was 1.2 folds and 1.6 folds higher than that obtained at OL-2 and OL-1, respectively. Along with power output, MFC was capable of efficiently degrading organic matter present in wastewater in the range of 54.5 % to 64.25 %. Successful reduction of organic matter from distillery wastewater apart from power generation establishes MFC using PVA-Nafion-borosilicate membrane as a suitable low cost technology for real wastewater treatment.","PeriodicalId":15527,"journal":{"name":"Journal of Clean Energy Technologies","volume":"97 1","pages":"155-158"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78246963","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}
Pub Date : 2018-03-01DOI: 10.18178/jocet.2018.6.2.451
M. T. Noori, D. Paul, M. Ghangrekar, C. K. Mukherjee
{"title":"Enhancing the Performance of Sediment Microbial Fuel Cell using Graphene Oxide – Zeolite Modified Anode and V2O5 Catalyzed Cathode","authors":"M. T. Noori, D. Paul, M. Ghangrekar, C. K. Mukherjee","doi":"10.18178/jocet.2018.6.2.451","DOIUrl":"https://doi.org/10.18178/jocet.2018.6.2.451","url":null,"abstract":"","PeriodicalId":15527,"journal":{"name":"Journal of Clean Energy Technologies","volume":"10 1","pages":"150-154"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77023997","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}
Pub Date : 2018-03-01DOI: 10.18178/JOCET.2018.6.2.457
Mert Gülüm, Atilla Bilgin
{"title":"Density and Viscosity Measurements for Olive Oil Biodiesel, Diesel Fuel and n-Butyl Alcohol Ternary Blends","authors":"Mert Gülüm, Atilla Bilgin","doi":"10.18178/JOCET.2018.6.2.457","DOIUrl":"https://doi.org/10.18178/JOCET.2018.6.2.457","url":null,"abstract":"","PeriodicalId":15527,"journal":{"name":"Journal of Clean Energy Technologies","volume":"8 1","pages":"183-187"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86210247","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}
Pub Date : 2018-03-01DOI: 10.18178/JOCET.2018.6.2.443
Haitham Alkhalaf, Najib Ibrahim, Wanglin Yan
This research presents an investigation into the performance of Earth Air Heat Exchanger (EAHE) in Malaysian climate. The passive cooling technology, where the ground is used as a heat sink to produce cooler air, it is an emerging of area of interest in Malaysia. This system is an important concept of sustainable design for Green House which enhance energy saving and reducing of Green House Gases emission. The aim of this study is to find the best ground cover in improving the (EAHE) proficiency through thermal model using computer simulation. The pipe which was used in thermal model have same parameters of real case which were 3-inch diameter and the material of pipe was PVC, the velocity of flow air was 1 m/s, the pipe was buried in 4m depth and had 50m length. The performance of the EAHE was simulated using loam, clay, sand, silty clay, sandy clay loam as back fill material. It was found that sandy soil is the best ground cover material.
{"title":"Numerical Study about Improving the Proficiency of an Earth Air Heat Exchanger System (EAHE) Employing Ground Cover Material","authors":"Haitham Alkhalaf, Najib Ibrahim, Wanglin Yan","doi":"10.18178/JOCET.2018.6.2.443","DOIUrl":"https://doi.org/10.18178/JOCET.2018.6.2.443","url":null,"abstract":"This research presents an investigation into the performance of Earth Air Heat Exchanger (EAHE) in Malaysian climate. The passive cooling technology, where the ground is used as a heat sink to produce cooler air, it is an emerging of area of interest in Malaysia. This system is an important concept of sustainable design for Green House which enhance energy saving and reducing of Green House Gases emission. The aim of this study is to find the best ground cover in improving the (EAHE) proficiency through thermal model using computer simulation. The pipe which was used in thermal model have same parameters of real case which were 3-inch diameter and the material of pipe was PVC, the velocity of flow air was 1 m/s, the pipe was buried in 4m depth and had 50m length. The performance of the EAHE was simulated using loam, clay, sand, silty clay, sandy clay loam as back fill material. It was found that sandy soil is the best ground cover material.","PeriodicalId":15527,"journal":{"name":"Journal of Clean Energy Technologies","volume":"33 1","pages":"106-111"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73308982","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}
Pub Date : 2018-03-01DOI: 10.18178/JOCET.2018.6.2.442
M. Taleb, M. Cherkaoui
Abstract—Recently, wind energy becomes one of important and promising sources of renewable energy despite its important fluctuations due to wind time varying nature. These fluctuations affect the power quality in the grid, mainly in term of frequency and voltage stability. Thus, Grid Managers are now dictating dynamic profiles for active and reactive powers that must be respected at the Point of Common Coupling (PCC) to make wind installations able to support the control of grid frequency and grid voltage. In this paper, it is detailed one of the most important types of Wind Energy Conversion System (WECS) consisting on Turbine associated with Doubly Fed Induction Generator (DFIG). Vector control concept using stator flux orientation is adopted to allow independent control of active and reactive powers to answer easily Grid Codes requirements. This work is limited to present the PI control with its direct and indirect approaches that are compared by using MATLAB-SIMULINK software. Except its limited robustness, PI Controller stays a simple and easy solution to control the power flow between WECS farms and electrical network. It should be noticed, however, that Indirect approach based on currents control gives better results in term of overshooting rates. This work constitutes a good basis to implement any other PQ control strategy.
{"title":"Active and Reactive Power Control of Doubly Fed Induction Generator Wind Turbines to Answer Grid Codes Requirements","authors":"M. Taleb, M. Cherkaoui","doi":"10.18178/JOCET.2018.6.2.442","DOIUrl":"https://doi.org/10.18178/JOCET.2018.6.2.442","url":null,"abstract":"Abstract—Recently, wind energy becomes one of important and promising sources of renewable energy despite its important fluctuations due to wind time varying nature. These fluctuations affect the power quality in the grid, mainly in term of frequency and voltage stability. Thus, Grid Managers are now dictating dynamic profiles for active and reactive powers that must be respected at the Point of Common Coupling (PCC) to make wind installations able to support the control of grid frequency and grid voltage. In this paper, it is detailed one of the most important types of Wind Energy Conversion System (WECS) consisting on Turbine associated with Doubly Fed Induction Generator (DFIG). Vector control concept using stator flux orientation is adopted to allow independent control of active and reactive powers to answer easily Grid Codes requirements. This work is limited to present the PI control with its direct and indirect approaches that are compared by using MATLAB-SIMULINK software. Except its limited robustness, PI Controller stays a simple and easy solution to control the power flow between WECS farms and electrical network. It should be noticed, however, that Indirect approach based on currents control gives better results in term of overshooting rates. This work constitutes a good basis to implement any other PQ control strategy.","PeriodicalId":15527,"journal":{"name":"Journal of Clean Energy Technologies","volume":"44 1","pages":"101-106"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77427505","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}
Pub Date : 2018-03-01DOI: 10.18178/JOCET.2018.6.2.455
Zijian Guo, Y. Zhang, Yun Peng, Wenyuan Wang
Offshore macro-engineering project plays an important role in promoting regional economic development. Macro-engineering projects are marked by high investment, long duration, adverse environmental condition, and high difficulty in estimating impacts in ecology. As an important component of environment risk assessment in the stage of feasible study before construction, ecology risk assessment is required in accordance with Chinese laws. However, critical assessing frameworks have not been established yet in China. Additionally, the shortage of characteristic data is another dilemma in marine ecosystem research. Therefore, in this paper, the US Environmental Protection Agency (USEPA) framework is adopted for ecological risk assessment and statistical method is used to estimate the data distribution according to the finite sample. Finally, a case study of Bohai Strait Channel project is analyzed with USEPA framework.
{"title":"Ecological Risk Assessment Approach of Offshore Macro-engineering Project Based on US Environmental Protection Agency Framework","authors":"Zijian Guo, Y. Zhang, Yun Peng, Wenyuan Wang","doi":"10.18178/JOCET.2018.6.2.455","DOIUrl":"https://doi.org/10.18178/JOCET.2018.6.2.455","url":null,"abstract":"Offshore macro-engineering project plays an important role in promoting regional economic development. Macro-engineering projects are marked by high investment, long duration, adverse environmental condition, and high difficulty in estimating impacts in ecology. As an important component of environment risk assessment in the stage of feasible study before construction, ecology risk assessment is required in accordance with Chinese laws. However, critical assessing frameworks have not been established yet in China. Additionally, the shortage of characteristic data is another dilemma in marine ecosystem research. Therefore, in this paper, the US Environmental Protection Agency (USEPA) framework is adopted for ecological risk assessment and statistical method is used to estimate the data distribution according to the finite sample. Finally, a case study of Bohai Strait Channel project is analyzed with USEPA framework.","PeriodicalId":15527,"journal":{"name":"Journal of Clean Energy Technologies","volume":"12 1","pages":"171-177"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74590021","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：