Suhyun Kim, Seong Jegarl, J. Lee, Hyun-Sil Kim, Jeseok Shin, Jihun Lim
{"title":"Technology Selection Method for Optimal Energy Storage","authors":"Suhyun Kim, Seong Jegarl, J. Lee, Hyun-Sil Kim, Jeseok Shin, Jihun Lim","doi":"10.7849/ksnre.2023.2041","DOIUrl":"https://doi.org/10.7849/ksnre.2023.2041","url":null,"abstract":"","PeriodicalId":178528,"journal":{"name":"New & Renewable Energy","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123305725","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}
Sung-Hee Hong, So-ra Kim, Eun-Jung Park, Hye-Rim Lee, Jin-Young Kim, Su-Jin Hwang, J. Song
{"title":"Estimating Spatial Scope of Local Government Ordinance for Onshore Wind Energy Generation Facilities","authors":"Sung-Hee Hong, So-ra Kim, Eun-Jung Park, Hye-Rim Lee, Jin-Young Kim, Su-Jin Hwang, J. Song","doi":"10.7849/ksnre.2022.0032","DOIUrl":"https://doi.org/10.7849/ksnre.2022.0032","url":null,"abstract":"","PeriodicalId":178528,"journal":{"name":"New & Renewable Energy","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130008485","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}
Considering the recent substantial increase in national research and development (R&D) budgets in the energy sector there has been increased Interest in the effectiveness of government R&D investments. We conducted a case study to calculate the allowable scale and effectiveness of R&D investment by calculating the direct performance improvement effect resulting from R&D investment as an economic value. Using conditions that existed prior to R&D investments as a reference, five cases in which performance improved due to R&D investments were compared and analyzed. The government’s financial investment is increasing rapidly in line with the establishment of the national hydrogen roadmap. R&D is needed to enhance the current low technology readiness level of hydrogen fuel cells compared to solar and wind energy fields. Therefore, an R&D project to improve the performance of the fuel cell system was selected as this case study’s subject. Using the results in this study, the allowable level of investment in the task unit of national R&D projects could be calculated. Moreover, it is advisable to provide a standard for rational decision making for new R&D investments since it is possible to determine investment priorities among a large number of candidates.
{"title":"Economic Analysis Study on the R&D Effect of Performance Improvement of the Tri-generation Fuel Cell System","authors":"Jong-Deuk Ahn, Kwangya Lee, Seok-Ho Seo","doi":"10.7849/ksnre.2022.0011","DOIUrl":"https://doi.org/10.7849/ksnre.2022.0011","url":null,"abstract":"Considering the recent substantial increase in national research and development (R&D) budgets in the energy sector there has been increased Interest in the effectiveness of government R&D investments. We conducted a case study to calculate the allowable scale and effectiveness of R&D investment by calculating the direct performance improvement effect resulting from R&D investment as an economic value. Using conditions that existed prior to R&D investments as a reference, five cases in which performance improved due to R&D investments were compared and analyzed. The government’s financial investment is increasing rapidly in line with the establishment of the national hydrogen roadmap. R&D is needed to enhance the current low technology readiness level of hydrogen fuel cells compared to solar and wind energy fields. Therefore, an R&D project to improve the performance of the fuel cell system was selected as this case study’s subject. Using the results in this study, the allowable level of investment in the task unit of national R&D projects could be calculated. Moreover, it is advisable to provide a standard for rational decision making for new R&D investments since it is possible to determine investment priorities among a large number of candidates.","PeriodicalId":178528,"journal":{"name":"New & Renewable Energy","volume":"16 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120925460","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}
This study evaluated the potential of coffee waste (CW) and used frying oil (UFO) as an additive in the production of pitch pine (PIP) and Mongolian oak (MOK) pellets. Ash contents obtained from CW and UFO were 0.5% and <0.1%, respectively. The calorific values of UFO (31.4 MJ/kg) and CW (26.3 MJ/kg) are higher than PIP (20.6 MJ/kg) and MOK (19.1 MJ/kg). For pellets fabricated using a pilot-scale flat-die pellet mill, regardless of fabricating conditions, moisture content (MC) and bulk density of PIP and MOK pellets satisfied the A1 wood pellet standard for residential and small-scale commercial uses, as designated by the National Institute of Forest Science (NIFOS) of the Republic of Korea. When CW was used as an additive, durability of PIP pellets made with 12%-MC sawdust and MOK pellets increased. The optimal conditions for producing PIP and MOK pellets could be by adding 20 mesh CW as an additive and the using of 12%-MC sawdust. However, durability of PIP pellets and ash content MOK pellets did not satisfy the A1 wood pellet standard of NIFOS. Thus, further research is needed to improve the properties of wood pellets with additives.
{"title":"Fuel Characteristics of Pitch Pine and Mongolian Oak Pellets Fabricated with Coffee Waste and Used Frying Oil as an Additive Using a Pilot-scale Flat-die Pellet Mills","authors":"In Yang, Xuanjun Jin, Gyu-Seong Han","doi":"10.7849/ksnre.2022.0025","DOIUrl":"https://doi.org/10.7849/ksnre.2022.0025","url":null,"abstract":"This study evaluated the potential of coffee waste (CW) and used frying oil (UFO) as an additive in the production of pitch pine (PIP) and Mongolian oak (MOK) pellets. Ash contents obtained from CW and UFO were 0.5% and <0.1%, respectively. The calorific values of UFO (31.4 MJ/kg) and CW (26.3 MJ/kg) are higher than PIP (20.6 MJ/kg) and MOK (19.1 MJ/kg). For pellets fabricated using a pilot-scale flat-die pellet mill, regardless of fabricating conditions, moisture content (MC) and bulk density of PIP and MOK pellets satisfied the A1 wood pellet standard for residential and small-scale commercial uses, as designated by the National Institute of Forest Science (NIFOS) of the Republic of Korea. When CW was used as an additive, durability of PIP pellets made with 12%-MC sawdust and MOK pellets increased. The optimal conditions for producing PIP and MOK pellets could be by adding 20 mesh CW as an additive and the using of 12%-MC sawdust. However, durability of PIP pellets and ash content MOK pellets did not satisfy the A1 wood pellet standard of NIFOS. Thus, further research is needed to improve the properties of wood pellets with additives.","PeriodicalId":178528,"journal":{"name":"New & Renewable Energy","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132310342","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}
Suhyun Kim, Yoon-Sik Kim, Sumin Park, Jihyeon An, Sanghun Lee
{"title":"Preliminary Feasibility Study on Wind and Solar Hybrid Power Systems based on Venturi Effects for Buildings","authors":"Suhyun Kim, Yoon-Sik Kim, Sumin Park, Jihyeon An, Sanghun Lee","doi":"10.7849/ksnre.2023.2040","DOIUrl":"https://doi.org/10.7849/ksnre.2023.2040","url":null,"abstract":"","PeriodicalId":178528,"journal":{"name":"New & Renewable Energy","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122126469","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}
Climatic characteristics were described using the LiDAR (Light Detection and Ranging) and the met-mast on Dongbok·Bukchon region. The influences of meteorological conditions on the power performance of wind turbines were presented using the data of Supervisory Control And Data Acquisition (SCADA) and met-mast of the Dongbok·Bukchon Wind Farm (DBWF) located in Jeju Island. The stability was categorized into three parameters (Richardson number, Turbulence intensity, and Wind shear exponent). DBWF was dominant in unstable atmospheric conditions. At wind speeds of 14 m/s or more, the proportion of slightly unstable conditions accounted for more than 50%. A clear difference in the power output of the wind turbine was exhibited in the category of atmospheric stability and turbulence intensity (TI). Particularly, a more sensitive difference in power performance was showed in the rated wind speeds of the wind turbine and wind regime with high TI. When the flow had a high turbulence at low wind speeds and a low turbulence at rated wind speeds, a higher wind energy potential was produced than that in other conditions. Finally, the high-efficiency of the wind farm was confirmed in the slightly unstable atmospheric stability. However, when the unstable state become stronger, the wind farm efficiency was lower than that in the stable state.
{"title":"Characteristics of Wind Environment in Dongbok･Bukchon Wind Farm on Jeju","authors":"Hyeong-Se Jeong, Yeon-Hee Kim, Hee-Wook Choi","doi":"10.7849/ksnre.2022.2027","DOIUrl":"https://doi.org/10.7849/ksnre.2022.2027","url":null,"abstract":"Climatic characteristics were described using the LiDAR (Light Detection and Ranging) and the met-mast on Dongbok·Bukchon region. The influences of meteorological conditions on the power performance of wind turbines were presented using the data of Supervisory Control And Data Acquisition (SCADA) and met-mast of the Dongbok·Bukchon Wind Farm (DBWF) located in Jeju Island. The stability was categorized into three parameters (Richardson number, Turbulence intensity, and Wind shear exponent). DBWF was dominant in unstable atmospheric conditions. At wind speeds of 14 m/s or more, the proportion of slightly unstable conditions accounted for more than 50%. A clear difference in the power output of the wind turbine was exhibited in the category of atmospheric stability and turbulence intensity (TI). Particularly, a more sensitive difference in power performance was showed in the rated wind speeds of the wind turbine and wind regime with high TI. When the flow had a high turbulence at low wind speeds and a low turbulence at rated wind speeds, a higher wind energy potential was produced than that in other conditions. Finally, the high-efficiency of the wind farm was confirmed in the slightly unstable atmospheric stability. However, when the unstable state become stronger, the wind farm efficiency was lower than that in the stable state.","PeriodicalId":178528,"journal":{"name":"New & Renewable Energy","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121450849","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}
In this study, the phase and electrochemical properties of Co and Ti substituted layered perovskites SmBaCo 2-x Ti x O 5+d (x=0.5, 0.7, 1.0, 1.1, 1.3, and 1.5) were analyzed, and their application as electrodes in solid oxide fuel cells (SOFCs) were evaluated. After calcination at 1300°C for 6 h, a single phase was observed for two compositions of the SmBaCo 2-x Ti x O 5+d oxide system, SmBaCoTiO 5+d (x=1.0) and SmBaCo 0.9 Ti 1.1 O 5+d (x=1.1). However, the phases of SmBaCoTiO 5+d (SBCTO) and SmTiO 3 coexisted for compositions with x≥1.3 (Ti content). In contrast, for compositions of x≤0.7, the SmBaCo 2 O 5+d phase was observed instead of the SmTiO 3 phase. To evaluate the applicability of these materials as SOFC electrodes, the electrical conductivities were measured under various atmospheres (air, N 2 , and H 2 ). SBCTO exhibited stable semi-conductor electrical conductivity behavior in an air and N 2 atmosphere. However, SBCTO showed insulator behavior at temperatures above 600℃ in a H 2 atmosphere. Therefore, SBCTO may only be used as cathode materials. Moreover, SBCTO had an area specific resistance (ASR) value of 0.140 Ω ･ cm 2 at 750℃. )
在本研究中，分析了Co和Ti取代层状钙钛矿SmBaCo 2-x Ti x O 5+d (x=0.5, 0.7, 1.0, 1.1, 1.3和1.5)的物相和电化学性能，并评估了它们作为固体氧化物燃料电池(sofc)电极的应用。在1300℃下煅烧6 h后，观察到SmBaCo 2-x Ti x o5 +d氧化物体系的两种组成，SmBaCo 5+d (x=1.0)和SmBaCo 0.9 Ti 1.1 o5 +d (x=1.1)。而对于x≥1.3 (Ti含量)的组合物，smbacotio5 +d (SBCTO)和smtio3相共存。相比之下，对于x≤0.7的组分，观察到SmBaCo 2o5 +d相而不是smtio3相。为了评估这些材料作为SOFC电极的适用性，在不同的气氛(空气、n2和h2)下测量了电导率。SBCTO在空气和氮气气氛中表现出稳定的半导体导电性。然而，在h2气氛中，SBCTO在600℃以上的温度下表现出绝缘体行为。因此，SBCTO只能用作正极材料。750℃时，SBCTO的面积比电阻(ASR)值为0.140 Ω日圆cm 2。
{"title":"Application of Layered Perovskites Substituted with Co and Ti as Electrodes in SOFCs","authors":"Changsoo Kim, T. Shin, Jungjin Nam, J. H. Kim","doi":"10.7849/ksnre.2022.0006","DOIUrl":"https://doi.org/10.7849/ksnre.2022.0006","url":null,"abstract":"In this study, the phase and electrochemical properties of Co and Ti substituted layered perovskites SmBaCo 2-x Ti x O 5+d (x=0.5, 0.7, 1.0, 1.1, 1.3, and 1.5) were analyzed, and their application as electrodes in solid oxide fuel cells (SOFCs) were evaluated. After calcination at 1300°C for 6 h, a single phase was observed for two compositions of the SmBaCo 2-x Ti x O 5+d oxide system, SmBaCoTiO 5+d (x=1.0) and SmBaCo 0.9 Ti 1.1 O 5+d (x=1.1). However, the phases of SmBaCoTiO 5+d (SBCTO) and SmTiO 3 coexisted for compositions with x≥1.3 (Ti content). In contrast, for compositions of x≤0.7, the SmBaCo 2 O 5+d phase was observed instead of the SmTiO 3 phase. To evaluate the applicability of these materials as SOFC electrodes, the electrical conductivities were measured under various atmospheres (air, N 2 , and H 2 ). SBCTO exhibited stable semi-conductor electrical conductivity behavior in an air and N 2 atmosphere. However, SBCTO showed insulator behavior at temperatures above 600℃ in a H 2 atmosphere. Therefore, SBCTO may only be used as cathode materials. Moreover, SBCTO had an area specific resistance (ASR) value of 0.140 Ω ･ cm 2 at 750℃. )","PeriodicalId":178528,"journal":{"name":"New & Renewable Energy","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125914711","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}
Sangkyun Kang, Jin-O Kim, Yong-Su Kim, W. Shin, Sang-Il Lee, J. Lee
{"title":"Airfoil Testing to Obtain Full-range Aerodynamic Characteristics based on Velocity Field Measurements Utilizing a Digital Wind Tunnel","authors":"Sangkyun Kang, Jin-O Kim, Yong-Su Kim, W. Shin, Sang-Il Lee, J. Lee","doi":"10.7849/ksnre.2022.0009","DOIUrl":"https://doi.org/10.7849/ksnre.2022.0009","url":null,"abstract":"","PeriodicalId":178528,"journal":{"name":"New & Renewable Energy","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128175242","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":"A Comparative Analysis of the Priority and Evaluation Factors of the Renewable Energy Plan Site by Country","authors":"Sung-Hoon Kim, Hwa-Young Yoon","doi":"10.7849/ksnre.2022.0034","DOIUrl":"https://doi.org/10.7849/ksnre.2022.0034","url":null,"abstract":"","PeriodicalId":178528,"journal":{"name":"New & Renewable Energy","volume":"188 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134161279","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}
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