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The Performance Analysis of Sea Water Heat Pump applied Low GWP Refrigerants 采用低GWP制冷剂的海水热泵性能分析
Power System Engineering Pub Date : 2016-10-31 DOI: 10.9726/KSPSE.2016.20.5.092
Seungtaek Lim, Hyeon-Ju Kim, Ho-seang Lee
{"title":"The Performance Analysis of Sea Water Heat Pump applied Low GWP Refrigerants","authors":"Seungtaek Lim, Hyeon-Ju Kim, Ho-seang Lee","doi":"10.9726/KSPSE.2016.20.5.092","DOIUrl":"https://doi.org/10.9726/KSPSE.2016.20.5.092","url":null,"abstract":": In this study, the seawater Heat Pump System using seawater with temperature of annual domestic conditions (0 ℃ to 25 ℃ ) is designed in order to compare its performance against the Heat Pump using unused heat of seawater. As a potential replacement for current refrigerants that exacerbate global warming and ozone delpetion, a Low GWP refrigerant’s performance is analyzed. The basic water to water Heat Pump system is chosen and three commercial refrigerants - R134a, R410a, R32 – are used to compare against new Low GWP refrigerant R1234ze. When seawater with temperature of 25 ℃ is used, the performance change showed maximal increase in COP, 38.3%. low GWP refrigerant R1234ze, showed great performance characteristics reach to 5.242 and Existing commercial refrigerant, R134a showed only less than 0.03 performance difference against R1234ze. The study confirms notable performance of R1234ze refrigerant through simulation as environmentally friendly refrigerant for domestic seawater Heat Pump.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133291574","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
Heat Transfer and Total Friction Factors in the Convergent Channels with V/⋀-shaped Ribs on Two Opposite Walls 两壁面V/ *形肋段收敛通道的换热及总摩擦系数
Power System Engineering Pub Date : 2016-10-31 DOI: 10.9726/KSPSE.2016.20.5.066
Myungsung Lee, Meo-Seong Heo, Ui-Jae Jeong, Young-Joon Park, Junghyun Yoo, G. Im, S. Ahn
{"title":"Heat Transfer and Total Friction Factors in the Convergent Channels with V/⋀-shaped Ribs on Two Opposite Walls","authors":"Myungsung Lee, Meo-Seong Heo, Ui-Jae Jeong, Young-Joon Park, Junghyun Yoo, G. Im, S. Ahn","doi":"10.9726/KSPSE.2016.20.5.066","DOIUrl":"https://doi.org/10.9726/KSPSE.2016.20.5.066","url":null,"abstract":": The measurements of heat transfer and total friction factors for turbulent flows in the convergent rectangular channels with two opposite in-line ribbed walls are reported. The study has covered three different angled ribs (30 o , 45 o and 60 o ) and Reynolds number in the range of 22,000 to 75,000. The channel, composing of ten isolated copper sections in the length of test section of 1 m, has the channel convergence ratio of D ho /D hi =0.67. The results show that the ribs pointing downstream ( ⋀ -shaped) is somewhat greater than the ribs pointing upstream (V-shaped) in the dimensionless Nusselt number and total friction factors.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114238624","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
Evaluation of the Characteristics of the Aluminum Alloy(AC8A) Casting Material by Heat Treatment(II) 铝合金(AC8A)铸造材料热处理性能评价(II)
Power System Engineering Pub Date : 2016-10-31 DOI: 10.9726/KSPSE.2016.20.5.029
K. Moon, Jae Hyun Jeong, Myeong-hoon Lee, Tae-Sil Baek
{"title":"Evaluation of the Characteristics of the Aluminum Alloy(AC8A) Casting Material by Heat Treatment(II)","authors":"K. Moon, Jae Hyun Jeong, Myeong-hoon Lee, Tae-Sil Baek","doi":"10.9726/KSPSE.2016.20.5.029","DOIUrl":"https://doi.org/10.9726/KSPSE.2016.20.5.029","url":null,"abstract":": Aluminum alloys have been widely used in engine materials, cold & hot-water storage vessels and piping etc., Furthermore, the aluminum alloy of AC8A have been widely used in mold casting material of engine piston for various vehicles because of its properties of temperature, wear and corrosion resistance. Therefore, it is considered that evaluation of corrosion resistance as well as wear resistance of AC8A material is also important to improve its property and to prolong its lifetime. In previous paper, the effect of solution(510 ℃ :4hrs) and tempering(190 ℃ : 16, 24, and 36 hrs)heat treatments to corrosion resistance and hardness were investigated using electrochemical method. In this study, in order to examine completely the effect of the tempering hours to hardness variation and corrosion resistance, the results of solution(510 ℃ :4hrs) and tempering(190 ℃ : 2, 4, 8 and 12hrs)heat treatments to hardness and corrosion resistance were investigated using electrochemical method. The hardness decreased with solution heat treatment compared to mold casting condition, but its value increased with tempering heat treatment. Furthermore, the corrosion resistance increased with decreasing of the hardness, and decreased with increasing of the hardness reversely. And the tempering heat treatment temperature at 190 ℃ for 8 hrs exhibited the highest value of the hardness and also indicated the highest corrosion current density. However, the values of hardness and corrosion current density was again increasingly decreased with increasing of .tempering hours than 8 hrs, Consequently, it is suggested that decision of the optimum. tempering hours is very important to improve the corrosion or wear resistance.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133349969","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
Corrosion Resistance of Cold Rolled Steel by Organic/Inorganic Hybrid Solution according to Composition of SiO 2 polysilicate and Melamine 基于sio2聚硅酸和三聚氰胺组成的有机/无机混合溶液对冷轧钢的耐蚀性
Power System Engineering Pub Date : 2016-10-31 DOI: 10.9726/KSPSE.2016.20.5.020
K. Nam, H. Jeong, B. Ahn, K. Lee
{"title":"Corrosion Resistance of Cold Rolled Steel by Organic/Inorganic Hybrid Solution according to Composition of SiO 2 polysilicate and Melamine","authors":"K. Nam, H. Jeong, B. Ahn, K. Lee","doi":"10.9726/KSPSE.2016.20.5.020","DOIUrl":"https://doi.org/10.9726/KSPSE.2016.20.5.020","url":null,"abstract":": This study has developed an organic/inorganic hybrid solution by addition of SiO 2 polysilicate and Melamine to the urethane. The three types of cold rolled steel were evaluated a corrosion resistance properties by using these solutions. The urethane solution(U) and the urethane solution with SiO 2 polysilicate(US 7 ) were generate a lot of corrosion. The urethane solution with SiO 2 polysilicate and melamine(US 7 M 3 ) was excellent in corrosion resistance, regardless of the steel type. In addition, corrosion resistance has been shown to depend on the tensile strength. The appearance of coating by U and US 7 solution is bumpy surface, and were a lot of fine defects. US 7 M 3 solution is made a sophisticated molecular cross-linking structure inside the coating, it was a slick surface. Other characteristics are exhibited the excellent property for all solutions.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128049643","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
A study on wear damage of SKD11 steel material for a cutting mold jig 切削模夹具用SKD11钢材料磨损损伤的研究
Power System Engineering Pub Date : 2016-10-31 DOI: 10.9726/KSPSE.2016.20.5.005
K. Nam, Cheol Kim, S. Ahn
{"title":"A study on wear damage of SKD11 steel material for a cutting mold jig","authors":"K. Nam, Cheol Kim, S. Ahn","doi":"10.9726/KSPSE.2016.20.5.005","DOIUrl":"https://doi.org/10.9726/KSPSE.2016.20.5.005","url":null,"abstract":": This study is on wear damage of the material for a molding machine that be used at finally cutting of metal beam made in roll forming process of vehicle bump beam process line. SKD11 steel was used with the material for cutting mold jig. In the cutting mold jig, Ti diffusion heat treatment after vacuum heat treatment was carried out for upgrade of surface hardness and anti-wear. Also, the heat treatments by various methods were performed to compare the wear damage degree against above the existing heat treatment. Wear loss and friction coefficient were obtained from wear test. And, micro Vickers hardness values were compared with damaged parts or not of cutting mold jig. Micro Vickers hardness value appeared higher at the undamaged part by Ti diffusion heat treatment. The micro Vickers hardness well followed a two-parameter Weibull probability distribution.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114578153","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
Fish Injured Rate Measurement Using Color Image Segmentation Method Based on K-Means Clustering Algorithm and Otsu’s Threshold Algorithm 基于k均值聚类算法和Otsu阈值算法的彩色图像分割方法测量鱼类损伤率
Power System Engineering Pub Date : 2016-08-31 DOI: 10.9726/KSPSE.2016.20.4.032
D. Sheng, Sang Bong Kim, T. Nguyen, D. Kim, T. Gao, Hak-Kyeong Kim
{"title":"Fish Injured Rate Measurement Using Color Image Segmentation Method Based on K-Means Clustering Algorithm and Otsu’s Threshold Algorithm","authors":"D. Sheng, Sang Bong Kim, T. Nguyen, D. Kim, T. Gao, Hak-Kyeong Kim","doi":"10.9726/KSPSE.2016.20.4.032","DOIUrl":"https://doi.org/10.9726/KSPSE.2016.20.4.032","url":null,"abstract":"This paper proposes two measurement methods for injured rate of fish surface using color image segmentation method based on K-means clustering algorithm and Otsu’s threshold algorithm. To do this task, the following steps are done. Firstly, an RGB color image of the fish is obtained by the CCD color camera and then converted from RGB to HSI. Secondly, the S channel is extracted from HSI color space. Thirdly, by applying the K-means clustering algorithm to the HSI color space and applying the Otsu’s threshold algorithm to the S channel of HSI color space, the binary images are obtained. Fourthly, morphological processes such as dilation and erosion, etc. are applied to the binary image. Fifthly, to count the number of pixels, the connected-component labeling is adopted and the defined injured rate is gotten by calculating the pixels on the labeled images. Finally, to compare the performances of the proposed two measurement methods based on the K-means clustering algorithm and the Otsu’s threshold algorithm, the edge detection of the final binary image after morphological processing is done and matched with the gray image of the original RGB image obtained by CCD camera. The results show that the detected edge of injured part by the K-means clustering algorithm is more close to real injured edge than that by the Otsu’ threshold algorithm.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129549004","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
Analysis of fuel economy characteristics depending on the fuel quality and calculation method changed 燃油经济性特性的分析取决于燃油质量和计算方法的变化
Power System Engineering Pub Date : 2016-08-31 DOI: 10.9726/KSPSE.2016.20.4.052
Minho Lee, Wan-Gyu Lim, Jae-Hyuk Lim, Ki-ho Kim
{"title":"Analysis of fuel economy characteristics depending on the fuel quality and calculation method changed","authors":"Minho Lee, Wan-Gyu Lim, Jae-Hyuk Lim, Ki-ho Kim","doi":"10.9726/KSPSE.2016.20.4.052","DOIUrl":"https://doi.org/10.9726/KSPSE.2016.20.4.052","url":null,"abstract":"","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130124892","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
The effect of wear on the damage of slitting knife 磨损对分切刀损伤的影响
Power System Engineering Pub Date : 2016-08-31 DOI: 10.9726/KSPSE.2016.20.4.005
K. Nam, Cheol-soo Kim, S. Ahn
{"title":"The effect of wear on the damage of slitting knife","authors":"K. Nam, Cheol-soo Kim, S. Ahn","doi":"10.9726/KSPSE.2016.20.4.005","DOIUrl":"https://doi.org/10.9726/KSPSE.2016.20.4.005","url":null,"abstract":": This study analyzed the damage to a slitting knife after cutting steel sheets. Damages to the structure were observed and wear tests were conducted. In addition, the degradation on the damaged and undamaged parts was compared with a micro Vickers hardness test. Weibull statistical analysis was carried out in order to evaluate the reliability of the micro Vickers hardness measured data. Spalling of the edge portion occurred by degradation during use over a long period. Rough parts in the specimens were caused by damage because the slitting knife was used for 1 year. The friction coefficient and wear loss at the damaged parts of the knife edge were slightly larger from shock due to repetitive cutting operation. The micro Vickers hardness followed a two-parameter Weibull probability distribution.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114351442","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
Reliability assessment of ERA-Interim/MERRA reanalysis data for the offshore wind resource assessment 海上风电资源评估ERA-Interim/MERRA再分析数据的可靠性评估
Power System Engineering Pub Date : 2016-08-31 DOI: 10.9726/KSPSE.2016.20.4.044
Jongho Byun, Jinhyuk Son, K. Ko
{"title":"Reliability assessment of ERA-Interim/MERRA reanalysis data for the offshore wind resource assessment","authors":"Jongho Byun, Jinhyuk Son, K. Ko","doi":"10.9726/KSPSE.2016.20.4.044","DOIUrl":"https://doi.org/10.9726/KSPSE.2016.20.4.044","url":null,"abstract":"An investigation on reliability of reanalysis wind data was conducted using the met mast wind data at four coastal regions, Jeju Island. Shinchang, Handong, Udo and Gangjeong sites were chosen for the met mast sites, and ERA-Interim and MERRA reanalysis data at two points on the sea around Jeju Island were analyzed for creating Wind Statistics of WindPRO software. Reliability of reanalysis wind data was assessed by comparing the statistics from the met mast wind data with those from Wind Statistics of WindPRO software. The relative error was calculated for annual average wind speed, wind power density and annual energy production. In addition, Weibull wind speed distribution and monthly energy production were analyzed in detail. As a result, ERA-Interim reanalysis data was more suitable for wind resource assessment than MERRA reanalysis data.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126679499","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
A Study on the Flame Stability of Porous Ceramic Burner 多孔陶瓷燃烧器的燃烧稳定性研究
Power System Engineering Pub Date : 2016-08-31 DOI: 10.9726/KSPSE.2016.20.4.012
Do-hyung Lee, Bong-Seok Yun
{"title":"A Study on the Flame Stability of Porous Ceramic Burner","authors":"Do-hyung Lee, Bong-Seok Yun","doi":"10.9726/KSPSE.2016.20.4.012","DOIUrl":"https://doi.org/10.9726/KSPSE.2016.20.4.012","url":null,"abstract":"Typical boiler system consists of combustion chamber and heat exchanger in one housing, therefore the size of boiler system is large and the heat exchanging efficiency becomes low. At these boiler systems, because the combustible mixture fires as free flame in the combustion chamber, consequently the combusted hot gas heats the heat exchanger only as conductive and convective heat transfer. The present Porous Ceramic Burner concept is that combustion process is occurred at the gaps of the porous ceramic materials, and the heat exchanger is placed in the same porous materials. Therefore we can reduce the boiler size, and we can also use radiative heat transfer from ceramic material with conductive and convective heat transfer from combusted gas throwing the porous materials. The purpose of this study is to search the flame stability ranges at different fuel flow rate and excess air ratio burning in the Al2O3 ceramic balls. We found out the stable excess air ratio range on given combustion intensity. And we can get clean porous ceramic combustion results compared with free flame.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"221 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115147923","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
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