International Journal of Energy Studies最新文献_第3页

Calculating the Optimum Window to Wall Ratio According to Daylight Factor and Thermal Performance in Mediterranean Climate 地中海气候条件下根据日照因子和热性能计算最佳窗墙比

International Journal of Energy Studies Pub Date : 2023-08-21 DOI: 10.58559/ijes.1265613

Pooya Lotfabadi

{"title":"Calculating the Optimum Window to Wall Ratio According to Daylight Factor and Thermal Performance in Mediterranean Climate","authors":"Pooya Lotfabadi","doi":"10.58559/ijes.1265613","DOIUrl":"https://doi.org/10.58559/ijes.1265613","url":null,"abstract":"Energy is a significant part of socio-economic development of modern societies. By increasing fossil fuel consumption as almost the main source of energy throughout the world, it is essential to search for more sustainable alternatives or a method to decrease this huge amount of usage. On the other hand, the building industry is known as one of the biggest energy consumers. Among building energy efficiency measures, openings are playing a key role in declining energy consumption, especially in hot summers of Cyprus. Therefore, this study carries out a field measurement of various opening sizes in the case study in order to make a satisfactory situation both from energy efficiency and visual comfort considerations. Meanwhile, a studio in a faculty of architecture, Famagusta, North Cyprus, has been selected as an experimental examination to show the effectiveness of the method. In order to analyze its energy performance, the calculation simplified method is chosen. Outcomes are intended to illustrate the benefits of the calculation method and to authorize opening size comparisons to display the differences in energy conservation measures inherent in the various compliance methods allowable by the regulations. Finally, the results obviously display that by decreasing the window to wall ratio, the heat loss significantly reduces. But, by considering the daylight factor (DF) in the standard defined range and applying 750lux as an essential lighting requirement for the studio, finding the minimum WWR seems more meaningful. Therefore, according to the mentioned criteria in this special case an optimum amount of WWR can be considered in the range of 10 to 20%, which gives architects some flexibility to apply in their designs.","PeriodicalId":159867,"journal":{"name":"International Journal of Energy Studies","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115401140","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

Effect of Oxy-Colorless Distributed Combustion of Methane Flame Behaviour in a Premixed Gas Turbine Burner 氧无色分布燃烧对预混燃气轮机燃烧器甲烷火焰行为的影响

International Journal of Energy Studies Pub Date : 2023-08-21 DOI: 10.58559/ijes.1344171

Buğrahan Alabaş, Zeliha Türkkahraman

{"title":"Effect of Oxy-Colorless Distributed Combustion of Methane Flame Behaviour in a Premixed Gas Turbine Burner","authors":"Buğrahan Alabaş, Zeliha Türkkahraman","doi":"10.58559/ijes.1344171","DOIUrl":"https://doi.org/10.58559/ijes.1344171","url":null,"abstract":"NOX emissions and flame characteristics in gas turbine burners are a current issue. Different combustion methods are tested for the solution of NOX emissions. One of these methods is oxy-colorless distributed combustion. In this method, CO2 is used as a diluent instead of N2 gas in the air. In this way, nitrogen does not enter the combustion chamber and theoretically NOX emissions are planned to be zero. In this study, a premixed and swirl assisted gas turbine combustion chamber used experimentally was verified numerically. Analyzes were carried out by keeping 3 kW thermal power, 1 swirl ratio and 0.7 equivalence ratios constant. The oxy-colorless distributed combustion method was applied to the pure methane flame at different O2/CO2 ratios. Analyzes were carried out with the O2 ratio of 26%, 21%, 19%, 17% and 15% by volume. The results showed that the colorless distributed combustion conditions were achieved as the CO2 ratio increased. Thanks to the oxy-colorless distributed combustion method, almost zero NOX emissions have been achieved. In addition, as the O2 ratio in the oxidizer mixture decreased, a significant decrease in the flame temperature was detected. Thanks to this study, the effect of oxy-colorless distributed combustion conditions in a premixed and swirl supported combustion chamber was investigated.","PeriodicalId":159867,"journal":{"name":"International Journal of Energy Studies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133497459","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

Examination of Combustion Behaviors and Emissions of Hydrogen Enriched Propane/Methane Fuel Under External Acoustic Application 外声作用下富氢丙烷/甲烷燃料燃烧行为及排放的研究

International Journal of Energy Studies Pub Date : 2023-08-21 DOI: 10.58559/ijes.1311653

Kamil Mutlu, Serdar Çeti̇ntaş, Murat Taştan

{"title":"Examination of Combustion Behaviors and Emissions of Hydrogen Enriched Propane/Methane Fuel Under External Acoustic Application","authors":"Kamil Mutlu, Serdar Çeti̇ntaş, Murat Taştan","doi":"10.58559/ijes.1311653","DOIUrl":"https://doi.org/10.58559/ijes.1311653","url":null,"abstract":"In this study, the instability and emission changes of hydrogen-enriched methane-propane fuel under external acoustic application in a premixed and vortex assisted system were investigated. In the experiment, 67% -33% and 63,5% -31,5% -5% were studied under different acoustic stresses as fuel mixtures. It is known that hydrogen can reduce the emission parameters polluting the environment and its effect on combustion stability. For this reason, interest in the use of hydrogen fuel with other fuels has increased. It may be possible to improve the combustive performance properties of compatible methane and propane mixtures by adding hydrogen. Also, the effects of acoustic applications were examined. Addition of hydrogen to the methane/propane flame increased the heating value of the mixture and caused flame instability due to the increase in laminar flame velocity. There was an increase of 12.2% in light intensity. When the amount of hydrogen increased, the flame was more resistant to acoustic stress. High dynamic pressure fluctuations occurred with 90 Hz acoustic forcing. The emission capacity of the mixture to which hydrogen is added by acoustic forcing has consistently higher values. This was attributed to the change in reaction kinetics due to the increased content.","PeriodicalId":159867,"journal":{"name":"International Journal of Energy Studies","volume":"182 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129639131","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

Investigation of Using Low GWP Alternatives to Replace R404A in The Refrigeration System 制冷系统中使用低GWP替代R404A的研究

International Journal of Energy Studies Pub Date : 2023-08-17 DOI: 10.58559/ijes.1335092

Meltem Koşan

{"title":"Investigation of Using Low GWP Alternatives to Replace R404A in The Refrigeration System","authors":"Meltem Koşan","doi":"10.58559/ijes.1335092","DOIUrl":"https://doi.org/10.58559/ijes.1335092","url":null,"abstract":"In recent years, the use of refrigerants, which increase the global warming potential by creating a greenhouse effect, has begun to be restricted in refrigeration systems. More environmentally friendly and more efficient synthetic mixtures and natural refrigerants are replacing refrigerants with high global warming potential. In this study, R404A refrigerant, which is frequently preferred in refrigeration systems, especially in residential split air conditioner applications, and has a high global warming potential, was discussed. Eight different refrigerants (R407H, R448A, R454A, R454C, R457A, R468A, R290, R1270) that could be alternatives to R404A refrigerant were examined and compared with R404A. Energy, exergy, and environmental analyzes were performed under the same conditions according to -10 ℃, -5 ℃, and 0 ℃ evaporating temperatures. Among the refrigerants, R290 had the best value with a coefficient of performance of 4.11 and an exergy efficiency of 40.04%. The values of R1270 refrigerant were also almost the same as R290. Even if R468A shows the lowest performance, it can be preferred over R404A because its global warming potential is lower than R404A.","PeriodicalId":159867,"journal":{"name":"International Journal of Energy Studies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129518924","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

Investigation of conversion of a diesel engine to Homogeneous Charge Compression Ignition engine using n-heptane: A Zero Dimensional Modeling 利用正庚烷技术研究柴油机向均质装药压缩点火发动机的转化:零维模型

International Journal of Energy Studies Pub Date : 2023-08-17 DOI: 10.58559/ijes.1325924

Gonca Kethudaoglu, F. Aktaş, Salih Karaaslan, Seyfi Polat, Nureddin Di̇nler

{"title":"Investigation of conversion of a diesel engine to Homogeneous Charge Compression Ignition engine using n-heptane: A Zero Dimensional Modeling","authors":"Gonca Kethudaoglu, F. Aktaş, Salih Karaaslan, Seyfi Polat, Nureddin Di̇nler","doi":"10.58559/ijes.1325924","DOIUrl":"https://doi.org/10.58559/ijes.1325924","url":null,"abstract":"Numerical methods are commonly used for analyzing combustion characteristics. Besides, they provide an opportunity to predict emissions of an engine. In this paper, the conversion of a single-cylinder diesel engine to HCCI combustion model is investigated with AVL Boost v2021R2. The model was used to simulate the power, emission, bsfc value. In-cylinder pressure results also are obtained from the model. Verification of the model is conducted with experimental data from the literature. The differentiation between the numerical and experimental results remained below 8.9% for the power, below 6.62% for bsfc. In addition to this, the model gave maximum pressure values with an accuracy of ± 1%, and maximum HRR values with an accuracy of ± 2%. Maximum HRR values and in-cylinder pressure curves for 1200-2400 rpm were obtained with acceptable accuracy. Besides, the operating range of an HCCI engine fueled with n-heptane was investigated using a zero-dimensional single-zone model with reduced fuel chemistry. The compression ratio and inlet air temperature effect on HCCI combustion were analyzed. The increasing the air inlet temperature to 40oC from 20oC , increases the lowest air-fuel ratio about 6.6% which the engine can operate without entering the knock zone, at 17.5 CR at 1200rpm.","PeriodicalId":159867,"journal":{"name":"International Journal of Energy Studies","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133255364","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

Performance analysis of battery energy storage system control strategies in terms of self-consumption and cost index considering demand flexibility for household prosumers 考虑家庭消费者需求灵活性的自耗和成本指标下电池储能系统控制策略性能分析

International Journal of Energy Studies Pub Date : 2023-08-11 DOI: 10.58559/ijes.1321550

Fatih Oğuzalp, Musa Terkes, Alpaslan Demirci

{"title":"Performance analysis of battery energy storage system control strategies in terms of self-consumption and cost index considering demand flexibility for household prosumers","authors":"Fatih Oğuzalp, Musa Terkes, Alpaslan Demirci","doi":"10.58559/ijes.1321550","DOIUrl":"https://doi.org/10.58559/ijes.1321550","url":null,"abstract":"The recent increase in renewable energy generation can balance consumption and reduce carbon emissions. With battery energy storage optimizing supply and demand, it is more important than ever to manage charge control to the benefit of all stakeholders. In this paper, the developed and proposed energy management control methods based on the technical operating criteria of battery energy storage (BESS) and considering self-consumption rate (SCR), self-supply rate (SSR) and curtailment rate are compared in terms of environmental index and economics for daily and annual demand profiles for various household prosumer demand profiles in Istanbul and Antalya. Considering the supply-demand matching based on demand flexibility, feed-in damping, fixed feed-in, schedule mode, schedule mode with constant charging power and self-consumption control methods are proposed for optimum operation for each prosumer profile. The results show that feed-in damping and fixed feed-in methods can reduce household prosumer costs by up to 22.3% in the daily analysis. Moreover, similar control methods can increase SCR by up to 29.5% and reduce costs by up to 10.62% for higher irradiances in the annual analysis. Proper management of BESS charge control can facilitate sustainable development goals by assisting plans of many stakeholders.","PeriodicalId":159867,"journal":{"name":"International Journal of Energy Studies","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127030042","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

Recent Advances in Solar Thermal System Involving Nanofluid Utilization: A Mini Review 纳米流体利用的太阳能热系统研究进展综述

International Journal of Energy Studies Pub Date : 2023-08-05 DOI: 10.58559/ijes.1299104

Edip Taşkesen, Ruzgar Uren

{"title":"Recent Advances in Solar Thermal System Involving Nanofluid Utilization: A Mini Review","authors":"Edip Taşkesen, Ruzgar Uren","doi":"10.58559/ijes.1299104","DOIUrl":"https://doi.org/10.58559/ijes.1299104","url":null,"abstract":"This study presents a research on the use of nanofluids in solar thermal systems. The aim of this study is to investigate the potential benefits of using nanofluids, such as increased efficiency and reduced costs. Nanofluids are a type of fluids that contain nanoparticles capable of enhancing thermal properties. The thermal efficiency of systems using nanofluids has been observed to be higher compared to systems using water as the working fluid. In this study, solar thermal energy and systems, nanofluids and their structures, integration of nanofluids into solar thermal systems, and the positive and negative effects of nanofluid usage in these systems were examined, highlighting the necessity of their integration. Furthermore, the study demonstrates that the use of nanofluids can reduce the size of the solar collector required to achieve the same performance level, which can lead to a decrease in the overall cost of the solar thermal system. The results of this study indicate that the use of nanofluids in solar thermal systems can significantly enhance efficiency and reduce costs. However, further research is needed to fully explore the benefits and limitations of using nanofluids in solar thermal systems","PeriodicalId":159867,"journal":{"name":"International Journal of Energy Studies","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114956350","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

Investigation of hybrid-electric propulsion system applied on Cessna 172S aircraft 塞斯纳172S飞机混合动力推进系统研究

International Journal of Energy Studies Pub Date : 2023-08-04 DOI: 10.58559/ijes.1312169

İsmail Ata, Burak Akgül

引用次数: 0

Numerical investigation of PV module cooling process by developing single-pass and doublepass PVT collectors 采用单道和双道PVT集热器对PV组件冷却过程进行数值研究

International Journal of Energy Studies Pub Date : 2023-08-04 DOI: 10.58559/ijes.1329160

Erhan Arslan

引用次数: 0

Analysis of electricity generation with combined power systems for residential buildings 住宅联电发电分析

International Journal of Energy Studies Pub Date : 2023-08-04 DOI: 10.58559/ijes.1326395

Eren Aküzüm, E. Çiftçi

{"title":"Analysis of electricity generation with combined power systems for residential buildings","authors":"Eren Aküzüm, E. Çiftçi","doi":"10.58559/ijes.1326395","DOIUrl":"https://doi.org/10.58559/ijes.1326395","url":null,"abstract":"Today, energy needs are increasing rapidly. Since our country imports a large part of its energy resources, it is extremely important to use energy efficiently and protect the environment in order to leave a livable country and world to future generations. One of the losses in energy transmission is transmission loss. In order to prevent this loss all over the world, \"distributed energy production\" method should be encouraged. By using the systems called \"combined heat and power systems\" with this method, electricity can be generated in facilities that need heat and electrical energy, and energy savings are achieved by using waste heat. Cogeneration systems can generally pay for themselves within 1.5-4 years. The aim of this study is to design combined power systems and to contribute to science with a wide literature survey including the technical and economic evaluation of the most efficient cogeneration and trigeneration applications. The systems in the literature are investigated and comparisons are made. Hydrogen fuel cell types for domestic applications are detailed and hydrogen is considered to be a logical choice. The effects of design and performance parameters are analysed. This combined power system does not harm the nature; it utilises natural resources such as wind, sun and hydrogen. The element hydrogen is abundant in nature and does not harm the environment; it can also be obtained by electrolysis of water.","PeriodicalId":159867,"journal":{"name":"International Journal of Energy Studies","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114153884","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