Journal of Energy Systems最新文献_第6页

R1234yf and R744 as alternatives to R134a at mobile air conditioners R1234yf和R744作为移动空调R134a的替代品

Journal of Energy Systems Pub Date : 2021-10-25 DOI: 10.30521/jes.949753

C. Onan, Serkan Erdem

{"title":"R1234yf and R744 as alternatives to R134a at mobile air conditioners","authors":"C. Onan, Serkan Erdem","doi":"10.30521/jes.949753","DOIUrl":"https://doi.org/10.30521/jes.949753","url":null,"abstract":": R1234yf is a synthetic HFO refrigerant co-developed as a replacement refrigerant for R134a in automotive air conditioning applications. Thus, in this study, alternatives to the R134a refrigerant that were removed from the newly produced devices were examined. The performance of the cooling processes of R1234yf and R744 refrigerant gases was compared with that of R134a. A simulation model was first developed. This simulation model was validated with experimental results. Analysis was conducted for both cooling and heating modes. In the case of cooling, evaporation temperature was 5 °C–7.5 °C, condenser, or gas cooler outlet temperature was 35 °C– 50 °C and the cooling load was 10 kW. In heating mode, evaporation temperature was −4 °C–12 °C, condenser, or gas cooler outlet temperature was 45 °C–50 °C and the heating load was 13.5 kW. The results were analyzed in terms of the coefficient of performance (COP), compressor power consumption, and compressor discharge temperature. In terms of COP and compressor power consumption, R134a gave the best results in all cases. R1234yf gave the closest results to R134a. In terms of compressor discharge temperature, which affects the lifetime and lubrication quality of the compressor, R1234yf gave the lowest temperatures in all cases.","PeriodicalId":52308,"journal":{"name":"Journal of Energy Systems","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70077236","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

Predicting Cost of Farm-based Biogas Plants 预测农场沼气厂的成本

Journal of Energy Systems Pub Date : 2021-10-18 DOI: 10.30521/jes.980467

Arash SAMİZADEH MASHHADİ, N. Saady, Carlos Bazan

引用次数: 0

On Minimization of the Group Variability of Intermittent Renewable Generators 间歇式可再生能源发电机组群变率最小化研究

Journal of Energy Systems Pub Date : 2021-10-15 DOI: 10.30521/jes.943813

D. Sabolic

引用次数: 0

Techno-economic analysis of a transmission line between an island grid and a mainland grid 岛网与大陆网之间输电线路的技术经济分析

Journal of Energy Systems Pub Date : 2021-09-30 DOI: 10.30521/jes.838784

B. Dinc, M. Fahrioglu, C. Batunlu

引用次数: 1

Solar energy sector under the influence of Covid-19 pandemic: A critical review 新冠肺炎疫情影响下的太阳能产业述评

Journal of Energy Systems Pub Date : 2021-09-23 DOI: 10.30521/jes.942691

H. Eroglu, Erdem Cüce

引用次数: 8

Structural design and testing of pouch cells 袋式电池的结构设计和测试

Journal of Energy Systems Pub Date : 2021-06-30 DOI: 10.30521/jes.815160

Aluru Vamsi̇, Jamal Ansari, Sun Mk, C. Pany, Bibin John, Aiswarya Samri̇dh, T. D. Mercy

引用次数: 1

Study of the effect of preparation parameters on thermal conductivity of metal oxide nanofluids using Taguchi method 田口法研究制备参数对金属氧化物纳米流体热导率的影响

Journal of Energy Systems Pub Date : 2021-06-30 DOI: 10.30521/jes.872530

N. Mane, Vadiraj Hemadri

引用次数: 3

Renewable energy development in rural areas of Uttar Pradesh: Current status, technologies and CO2 mitigation analysis 北方邦农村地区可再生能源发展：现状、技术和二氧化碳减排分析

Journal of Energy Systems Pub Date : 2021-06-30 DOI: 10.30521/jes.816049

Akanksha Sharma, H. Singh, R. Viral, N. Anwer

{"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}

引用次数: 2

Evaluation through finite element and numerical simulation of triboelectric polymer pairs in vertical contact mode 摩擦电聚合物对在垂直接触模式下的有限元和数值模拟评价

Journal of Energy Systems Pub Date : 2021-03-31 DOI: 10.30521/JES.847237

S. Shafeek, Sibgatulla Sharieef Sharieef

{"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}

引用次数: 1

Dynamic analysis of a tri-floater with vertical axis wind turbine supported at its centroid 三浮子式垂直轴风力机质心支承的动力分析

Journal of Energy Systems Pub Date : 2021-03-31 DOI: 10.30521/JES.811097

Asadulla Thoppil, M. Akbar, D. Rambabu

{"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}

引用次数: 2