Journal of Energy最新文献_第10页

The Economics of Renewable Energy Sources into Electricity Generation in Tanzania 坦桑尼亚可再生能源发电的经济学

Journal of Energy Pub Date : 2016-07-17 DOI: 10.1155/2016/5837154

Baraka Kichonge, I. Mkilaha, G. John, S. Hameer

{"title":"The Economics of Renewable Energy Sources into Electricity Generation in Tanzania","authors":"Baraka Kichonge, I. Mkilaha, G. John, S. Hameer","doi":"10.1155/2016/5837154","DOIUrl":"https://doi.org/10.1155/2016/5837154","url":null,"abstract":"The study analyzes the economics of renewable energy sources into electricity generation in Tanzania. Business as usual (BAU) scenario and renewable energy (RE) scenario which enforce a mandatory penetration of renewable energy sources shares into electricity generations were analyzed. The results show total investment cost for the BAU scenario is much lower as compared to RE scenario while operating and maintenance variable costs are higher in BAU scenario. Primary energy supply in BAU scenario is higher tied with less investment costs as compared to RE scenario. Furthermore, the share of renewable energy sources in BAU scenario is insignificant as compared to RE scenario due to mandatory penetration policy imposed. Analysis concludes that there are much higher investments costs in RE scenario accompanied with less operating and variable costs and lower primary energy supply. Sensitivity analysis carried out suggests that regardless of changes in investments cost of coal and CCGT power plants, the penetration of renewable energy technologies was still insignificant. Notwithstanding the weaknesses of renewable energy technologies in terms of the associated higher investments costs, an interesting result is that it is possible to meet future electricity demand based on domestic resources including renewables.","PeriodicalId":30572,"journal":{"name":"Journal of Energy","volume":"18 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2016-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90703585","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: 4

Overcapacity as a Barrier to Renewable Energy Deployment: The Spanish Case 产能过剩是可再生能源部署的障碍:西班牙案例

Journal of Energy Pub Date : 2016-07-12 DOI: 10.1155/2016/8510527

P. Río, L. Janeiro

引用次数: 25

A Comfort-Aware Energy Efficient HVAC System Based on the Subspace Identification Method 基于子空间辨识法的舒适节能HVAC系统

Journal of Energy Pub Date : 2016-03-02 DOI: 10.1155/2016/5074846

O. Tsakiridis, D. Sklavounos, E. Zervas, J. Stonham

引用次数: 8

Benchmarking of Electricity Distribution Licensees Operating in Sri Lanka 在斯里兰卡营运的配电持牌机构的基准

Journal of Energy Pub Date : 2016-02-16 DOI: 10.1155/2016/2486319

K.T.M.U. Hemapala, L. Neelawala

{"title":"Benchmarking of Electricity Distribution Licensees Operating in Sri Lanka","authors":"K.T.M.U. Hemapala, L. Neelawala","doi":"10.1155/2016/2486319","DOIUrl":"https://doi.org/10.1155/2016/2486319","url":null,"abstract":"Electricity sector regulators are practicing benchmarking of distribution companies to regulate the allowed revenue. Mainly this is carried out based on the relative efficiency scores produced by frontier benchmarking techniques. Some of these techniques, for example, Corrected Ordinary Least Squares method and Stochastic Frontier Analysis, use econometric approach to estimate efficiency scores, while a method like Data Envelopment Analysis uses linear programming. Those relative efficiency scores are later used to calculate the efficiency factor (X-factor) which is a component of the revenue control formula. In electricity distribution industry in Sri Lanka, the allowed revenue for a particular distribution licensee is calculated according to the allowed revenue control formula as specified in the tariff methodology of Public Utilities Commission of Sri Lanka. This control formula contains the X-factor as well, but its effect has not been considered yet; it just kept it zero, since there were no relative benchmarking studies carried out by the utility regulators to decide the actual value of X-factor. This paper focuses on producing a suitable benchmarking methodology by studying prominent benchmarking techniques used in international regulatory regime and by analyzing the applicability of them to Sri Lankan context, where only five Distribution Licensees are operating at present.","PeriodicalId":30572,"journal":{"name":"Journal of Energy","volume":"34 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2016-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73465097","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: 3

A Thermodynamic Analysis of Two Competing Mid-Sized Oxyfuel Combustion Combined Cycles 两个竞争的中型氧燃料燃烧联合循环的热力学分析

Journal of Energy Pub Date : 2016-01-24 DOI: 10.1155/2016/2438431

E. Thorbergsson, T. Grönstedt

{"title":"A Thermodynamic Analysis of Two Competing Mid-Sized Oxyfuel Combustion Combined Cycles","authors":"E. Thorbergsson, T. Grönstedt","doi":"10.1155/2016/2438431","DOIUrl":"https://doi.org/10.1155/2016/2438431","url":null,"abstract":"A comparative analysis of two mid-sized oxy-fuel combustion combined cycles is performed. The two cycles are the Semi Closed Oxy-fuel Combustion Combined Cycle (SCOC-CC) and the Graz cycle. In addition, a reference cycle was established as the basis for the analysis of the oxy-fuel combustion cycles. The fuel for all three cycles is natural gas. A parametric study was conducted where the pressure ratio and the turbine entry temperature (also called combustor outlet temperature) were varied. The optimum net efficiency for the reference cycle is 56% at a pressure ratio of 26.2 and turbine entry temperature of 1400 C. The optimum net efficiency for the SCOC-CC was 46% at a pressure ratio of 57.3 and a turbine entry temperature of 1450 C . The optimum net efficiency for the Graz cycle was also 46% at a lower pressure ratio than the SCOC-CC, at 36.5 at the same turbine entry temperature of 1450 C. The main reduction in effifciency for the oxy-fuel combustion cycles comes from the O2 production and compression. The layout and the design of the SCOC-CC is considerably simpler than the Graz cycle while it achieves the same net efficiency. The fact that the efficiencies for the two cycles are close to identical differs from previously reported work. Earlier studies have reported around a 3% points advantage in efficiency for the Graz cycle, which is attributed to the use of a second bottoming cycle. This additional feature, possible to include in both cycles, is omitted to make the two cycles more comparable in terms of complexity. Even in its simplified form the Graz cycle requires the use of intercooling and steam cooling, in contrast to the SCOC-CC. The Graz cycle, however, has substantially lower pressure ratio at the optimum efficiency and has much higher power density for the gas turbine than both the reference cycle and the SCOC-CC.","PeriodicalId":30572,"journal":{"name":"Journal of Energy","volume":"347 1","pages":"1-14"},"PeriodicalIF":0.0,"publicationDate":"2016-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84858125","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: 16

Gearbox Fault Diagnosis of Wind Turbine by KA and DRT 基于KA和DRT的风电齿轮箱故障诊断

Journal of Energy Pub Date : 2016-01-01 DOI: 10.1155/2016/9451631

M. Heidari

引用次数: 1

Development of a Cost-Effective Solar/Diesel Independent Power Plant for a Remote Station 开发一种具有成本效益的太阳能/柴油独立电站

Journal of Energy Pub Date : 2015-12-29 DOI: 10.1155/2015/828745

Okeolu Samuel Omogoye, A. B. Ogundare, I. O. Akanji

{"title":"Development of a Cost-Effective Solar/Diesel Independent Power Plant for a Remote Station","authors":"Okeolu Samuel Omogoye, A. B. Ogundare, I. O. Akanji","doi":"10.1155/2015/828745","DOIUrl":"https://doi.org/10.1155/2015/828745","url":null,"abstract":"The paper discusses the design, simulation, and optimization of a solar/diesel hybrid power supply system for a remote station. The design involves determination of the station total energy demand as well as obtaining the station solar radiation data. This information was used to size the components of the hybrid power supply system (HPSS) and to determine its configuration. Specifically, an appropriate software package, HOMER, was used to determine the number of solar panels, deep-cycle batteries, and rating of the inverter that comprise the solar section of the HPSS. A suitable diesel generator was also selected for the HPSS after careful technical and cost analysis of those available in the market. The designed system was simulated using the HOMER software package and the simulation results were used to carry out the optimization of the system. The final design adequately meets the station energy requirement. Based on a life expectancy of twenty-five years, a cost-benefit analysis of the HPSS was carried out. This analysis shows that the HPSS has a lower cost as compared to a conventional diesel generator power supply, thus recommending the HPSS as a more cost-effective solution for this application.","PeriodicalId":30572,"journal":{"name":"Journal of Energy","volume":"25 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2015-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76093169","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: 8

Briquetting of Charcoal from Sesame Stalk 芝麻秸秆炭的压块

Journal of Energy Pub Date : 2015-08-25 DOI: 10.1155/2015/757284

Alula Gebresas, H. Asmelash, Hadush Berhe, Tsegay Tesfay

{"title":"Briquetting of Charcoal from Sesame Stalk","authors":"Alula Gebresas, H. Asmelash, Hadush Berhe, Tsegay Tesfay","doi":"10.1155/2015/757284","DOIUrl":"https://doi.org/10.1155/2015/757284","url":null,"abstract":"Due to the easy availability of wood in Ethiopia, wood charcoal has been the main source fuel for cooking. This study has been started on sesame stalk biomass briquetting which can potentially solve the health problems and shortage of energy, which consequently can solve deforestation. The result of the data collection shows that, using 30% conversion efficiency of carbonizer, it was found that more than 150,000 tonnes of charcoal can be produced from the available sesame stalk in Humera, a place in north Ethiopia. The clay binders that are mixed with carbonized sesame stalk were found to have 69 liquid limits; thus, the optimum amount of clay that should be added as a binder is 15%, which results in better burning and heat holding capacity and better heating time. The developed briquetting machine has a capacity of producing 60 Kg/hr but the carbonization kiln can only carbonize 3.1 Kg in 2 : 40 hours; hence, it is a bottle neck for the briquette production. The hydrocarbon laboratory analysis showed that the calorific value of the charcoal produced with 15% clay content is 4647.75 Cal/gm and decreases as clay ratio increases and is found to be sufficient energy content for cooking.","PeriodicalId":30572,"journal":{"name":"Journal of Energy","volume":"1 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2015-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83151545","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: 25

The Effects of Air Preheating and Fuel/Air Inlet Diameter on the Characteristics of Vortex Flame 空气预热和燃料/空气进口直径对旋涡火焰特性的影响

Journal of Energy Pub Date : 2015-05-14 DOI: 10.1155/2015/397219

M. Khaleghi, S. E. Hosseini, M. Wahid, H. Mohammed

引用次数: 6

A Subspace Identification Method for Detecting Abnormal Behavior in HVAC Systems 暖通空调系统异常行为检测的子空间识别方法

Journal of Energy Pub Date : 2015-03-11 DOI: 10.1155/2015/693749

D. Sklavounos, E. Zervas, O. Tsakiridis, J. Stonham

引用次数: 6