Pub Date : 2022-10-30DOI: 10.7836/kses.2022.42.5.063
Tae-Gyun Yun, J. Shin, Seok-pyo Kang
Due to the construction industry, the increase in energy demands from the population, and economic growth in Vietnam, the need for energy efficient buildings has increased. An analysis of Vietnam’s regulations and standards related to building energy shows that Vietnam’s current technology level is similar to Korea in the 1980s, so it needs to upgrade its technology. Using Korea’s advanced energy efficient building technology, it will be possible to satisfy Vietnam’s need for energy efficient buildings. In a prior study, the baseline data were calculated using a building energy simulation program with Vietnam’s weather data and input values provided by the most recent Vietnam building energy standards (QCVN 09:2017:BXD). Then, the optimized input combination of building energy packages was derived to achieve energy savings of 60% by integrating the building energy simulation program (Energyplus) with a programming language (Python). Vietnam’s climate characteristics vary by region, so simulations were run with three sets of weather data (Northern: Hanoi, Central: Da Nang, Southern: Ho Chi Minh). As a result, the optimized input combination could reduce building energy usage by about 55% compared to the baseline model. In this study, building energy savings were analyzed using simulated data by modeling a real example building in Vietnam before the building energy package was installed.
{"title":"Analysis of Building Energy Reduction by Building Energy Package Regarding Vietnam Environmental Condition and Economic","authors":"Tae-Gyun Yun, J. Shin, Seok-pyo Kang","doi":"10.7836/kses.2022.42.5.063","DOIUrl":"https://doi.org/10.7836/kses.2022.42.5.063","url":null,"abstract":"Due to the construction industry, the increase in energy demands from the population, and economic growth in Vietnam, the need for energy efficient buildings has increased. An analysis of Vietnam’s regulations and standards related to building energy shows that Vietnam’s current technology level is similar to Korea in the 1980s, so it needs to upgrade its technology. Using Korea’s advanced energy efficient building technology, it will be possible to satisfy Vietnam’s need for energy efficient buildings. In a prior study, the baseline data were calculated using a building energy simulation program with Vietnam’s weather data and input values provided by the most recent Vietnam building energy standards (QCVN 09:2017:BXD). Then, the optimized input combination of building energy packages was derived to achieve energy savings of 60% by integrating the building energy simulation program (Energyplus) with a programming language (Python). Vietnam’s climate characteristics vary by region, so simulations were run with three sets of weather data (Northern: Hanoi, Central: Da Nang, Southern: Ho Chi Minh). As a result, the optimized input combination could reduce building energy usage by about 55% compared to the baseline model. In this study, building energy savings were analyzed using simulated data by modeling a real example building in Vietnam before the building energy package was installed.","PeriodicalId":276437,"journal":{"name":"Journal of the Korean Solar Energy Society","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134293644","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}
Pub Date : 2022-10-30DOI: 10.7836/kses.2022.42.5.037
Jun Young Kim, Kunsik An
{"title":"Conventional Polymer Solar Cell using Low Temperature Sol-gel ZnO Thin Film","authors":"Jun Young Kim, Kunsik An","doi":"10.7836/kses.2022.42.5.037","DOIUrl":"https://doi.org/10.7836/kses.2022.42.5.037","url":null,"abstract":"","PeriodicalId":276437,"journal":{"name":"Journal of the Korean Solar Energy Society","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126991206","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}
Pub Date : 2022-10-30DOI: 10.7836/kses.2022.42.5.025
Yong-Ha Kim, Yu-Ri Kim, Sang-Hwa Han, Hye-Seon Lee, Jong-Min Park, Gyu-Rim Han
In this study, a methodology for calculating representative regional photovoltaic power generation in 24 hours of the year was developed to expand renewable energy cloud platform functionality of Korea Energy Agency. To compute regional photovoltaic power generation in 24 hours of the year, the monthly regional representative insolation in 24 hours was calculated, as well as their probability distributions. Accordingly, the monthly regional photovoltaic power generation in 24 hours was calculated, and the expected value of regional photovoltaic power generation in 24 hours of the year was derived. Subsequently, the representative regional photovoltaic power generation in 24 hours of the year was calculated. Representative regional photovoltaic power generation in 24 hours of the year calculated in this study can be applied to distributed energy resources to resolve the output variability of renewable energy. The obtained result can be used for distributed resource operation planning, such as estimating the regional Energy Storage System capacity. Currently, the Korea Energy Agency's renewable energy cloud platform provides users only with information about solar installation. However, the function of the renewable energy cloud platform can be expanded by applying the results obtained in this study to the distributed resource operation planning.
{"title":"A Methodology for Calculating Representative Regional Photovoltaic Power Generation in 24 Hours of the Year for Expanding Renewable Energy Cloud Platform Functionality","authors":"Yong-Ha Kim, Yu-Ri Kim, Sang-Hwa Han, Hye-Seon Lee, Jong-Min Park, Gyu-Rim Han","doi":"10.7836/kses.2022.42.5.025","DOIUrl":"https://doi.org/10.7836/kses.2022.42.5.025","url":null,"abstract":"In this study, a methodology for calculating representative regional photovoltaic power generation in 24 hours of the year was developed to expand renewable energy cloud platform functionality of Korea Energy Agency. To compute regional photovoltaic power generation in 24 hours of the year, the monthly regional representative insolation in 24 hours was calculated, as well as their probability distributions. Accordingly, the monthly regional photovoltaic power generation in 24 hours was calculated, and the expected value of regional photovoltaic power generation in 24 hours of the year was derived. Subsequently, the representative regional photovoltaic power generation in 24 hours of the year was calculated. Representative regional photovoltaic power generation in 24 hours of the year calculated in this study can be applied to distributed energy resources to resolve the output variability of renewable energy. The obtained result can be used for distributed resource operation planning, such as estimating the regional Energy Storage System capacity. Currently, the Korea Energy Agency's renewable energy cloud platform provides users only with information about solar installation. However, the function of the renewable energy cloud platform can be expanded by applying the results obtained in this study to the distributed resource operation planning.","PeriodicalId":276437,"journal":{"name":"Journal of the Korean Solar Energy Society","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130322315","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}
Pub Date : 2022-10-30DOI: 10.7836/kses.2022.42.5.045
C. Moon, N. Jeon
The bandgap of halide perovskite materials can be easily adjusted through compositional variation. Perovskite solar cells (PSCs) have attracted attention as promising materials for tandem solar cells because of their tunable bandgaps. Nevertheless, the photoinduced halide segregation phenomenon, which is related to photostability and device performance, remains a problem. Herein, we confirmed that the perovskite composition was controlled by the triple halide composition through the addition of lead chloride (PbCl 2 ). The triple halide composition not only controlled the perovskite bandgap but also suppressed the photoinduced halide segregation in the perovskite film. In addition, the device performance was improved by the enhanced crystallinity of the perovskite thin film with the triple halide composition. (wide bandgap perovskite), (triple halide composition), 상 분리 (halide phase segregation), 탠덤태양전지 (tandem solar cells)
{"title":"A Study on Improving the Properties of Wide Bandgap Perovskite Through Triple Halide Composition","authors":"C. Moon, N. Jeon","doi":"10.7836/kses.2022.42.5.045","DOIUrl":"https://doi.org/10.7836/kses.2022.42.5.045","url":null,"abstract":"The bandgap of halide perovskite materials can be easily adjusted through compositional variation. Perovskite solar cells (PSCs) have attracted attention as promising materials for tandem solar cells because of their tunable bandgaps. Nevertheless, the photoinduced halide segregation phenomenon, which is related to photostability and device performance, remains a problem. Herein, we confirmed that the perovskite composition was controlled by the triple halide composition through the addition of lead chloride (PbCl 2 ). The triple halide composition not only controlled the perovskite bandgap but also suppressed the photoinduced halide segregation in the perovskite film. In addition, the device performance was improved by the enhanced crystallinity of the perovskite thin film with the triple halide composition. (wide bandgap perovskite), (triple halide composition), 상 분리 (halide phase segregation), 탠덤태양전지 (tandem solar cells)","PeriodicalId":276437,"journal":{"name":"Journal of the Korean Solar Energy Society","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114576436","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}
Pub Date : 2022-08-30DOI: 10.7836/kses.2022.42.4.093
Ji-Hyeon Kim, Hyun-Seung Lee, Byung-Chil Oh, U. Shin
The characteristics of energy consumption of school buildings considering their distinctive functional schedule (including summer and winter vacation) differ from those of residential and business buildings. In order to build zero-energy schools, the introduction of an energy-saving plan and renewable energy system that reflect the actual energy use of school buildings should be considered. However, ECO2, the only evaluation tool used for zero-energy building certification, does not reflect the actual energy use of schools. In this study, we analyzed characteristics of energy consumption of ‘S’ high school located in Jincheon, Chungcheongbuk-do, based on measurement data received from a remote monitoring system and city gas usage. Based on the results, the measured actual energy consumption and the energy consumption evaluated in the ‘Building Energy Efficiency Certification’ were compared. The energy-use intensity of the actual energy consumption was 125.9 kWh/m 2 yr, which was 1++ grade. The energy use intensity evaluated through this certification was 188.9 kWh/m 2 yr, which was 1+ grade. Concerning energy consumption by use, the actual energy consumption in decreasing order was heating (31%), ventilation (25%), cooling (23%), lighting (15%), and hot water supply (6%; excluding cooking), and electric appliance and plug load (37%). Cooling was the largest unit according to “Building Energy Efficiency Certification” evaluation criteria at 36%, followed by heating (31%), lighting (11%), ventilation (10%), and hot water (9%). The results differed considerably from the actual energy consumption and energy consumption evaluated through ECO2. The results would likely be distorted if an energy reduction measure and a zero energy implementation plan were established based on the results.
{"title":"Case Analysis of Energy Consumption Characteristics of High School Facilities for Zero Energy School Realization","authors":"Ji-Hyeon Kim, Hyun-Seung Lee, Byung-Chil Oh, U. Shin","doi":"10.7836/kses.2022.42.4.093","DOIUrl":"https://doi.org/10.7836/kses.2022.42.4.093","url":null,"abstract":"The characteristics of energy consumption of school buildings considering their distinctive functional schedule (including summer and winter vacation) differ from those of residential and business buildings. In order to build zero-energy schools, the introduction of an energy-saving plan and renewable energy system that reflect the actual energy use of school buildings should be considered. However, ECO2, the only evaluation tool used for zero-energy building certification, does not reflect the actual energy use of schools. In this study, we analyzed characteristics of energy consumption of ‘S’ high school located in Jincheon, Chungcheongbuk-do, based on measurement data received from a remote monitoring system and city gas usage. Based on the results, the measured actual energy consumption and the energy consumption evaluated in the ‘Building Energy Efficiency Certification’ were compared. The energy-use intensity of the actual energy consumption was 125.9 kWh/m 2 yr, which was 1++ grade. The energy use intensity evaluated through this certification was 188.9 kWh/m 2 yr, which was 1+ grade. Concerning energy consumption by use, the actual energy consumption in decreasing order was heating (31%), ventilation (25%), cooling (23%), lighting (15%), and hot water supply (6%; excluding cooking), and electric appliance and plug load (37%). Cooling was the largest unit according to “Building Energy Efficiency Certification” evaluation criteria at 36%, followed by heating (31%), lighting (11%), ventilation (10%), and hot water (9%). The results differed considerably from the actual energy consumption and energy consumption evaluated through ECO2. The results would likely be distorted if an energy reduction measure and a zero energy implementation plan were established based on the results.","PeriodicalId":276437,"journal":{"name":"Journal of the Korean Solar Energy Society","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128441913","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}
Pub Date : 2022-08-30DOI: 10.7836/kses.2022.42.4.047
Yongjae Lee, Deokcheol Seo, J. Park, Haenam Jang
We developed a remote terminal unit (RTU) with real-time communication for the optimal operation of a virtual power plant (Vpp) platform. Currently, Vpp presents two issues during operation: 1) inadequate implementation of real-time communication of measured data and 2) insufficient data security, high initial investment cost, maintenance cost, and insufficient ease of installation. To overcome these problems, we developed an integrated RTU module. The main objective was to develop a real-time power generation information transmission module that combines the functions of a power meter, an RTU, and environmental sensors, such that real-time information can be transmitted from the PV inverter, environment sensors, and power meters. Furthermore, the RTU can employ the standard protocol for exclusive PV system communication and save data during communication failure for as long as 90 d. It can also immediately transmit the saved data after recovering from a communication failure. Moreover, we developed an RTU webpage where users can change the configuration of the RTU module and monitor the condition of the inverter connection and power generation.
{"title":"Development of Remoted Terminal Unit with Real-time Communication for Optimal Operation of the Virtual Power Plant","authors":"Yongjae Lee, Deokcheol Seo, J. Park, Haenam Jang","doi":"10.7836/kses.2022.42.4.047","DOIUrl":"https://doi.org/10.7836/kses.2022.42.4.047","url":null,"abstract":"We developed a remote terminal unit (RTU) with real-time communication for the optimal operation of a virtual power plant (Vpp) platform. Currently, Vpp presents two issues during operation: 1) inadequate implementation of real-time communication of measured data and 2) insufficient data security, high initial investment cost, maintenance cost, and insufficient ease of installation. To overcome these problems, we developed an integrated RTU module. The main objective was to develop a real-time power generation information transmission module that combines the functions of a power meter, an RTU, and environmental sensors, such that real-time information can be transmitted from the PV inverter, environment sensors, and power meters. Furthermore, the RTU can employ the standard protocol for exclusive PV system communication and save data during communication failure for as long as 90 d. It can also immediately transmit the saved data after recovering from a communication failure. Moreover, we developed an RTU webpage where users can change the configuration of the RTU module and monitor the condition of the inverter connection and power generation.","PeriodicalId":276437,"journal":{"name":"Journal of the Korean Solar Energy Society","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121861586","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}
Pub Date : 2022-08-30DOI: 10.7836/kses.2022.42.4.105
H. Hwang, Dong-Gyu Lim
Currently, the photovoltaic industry is focusing on the development of low-cost modules with increased efficiency by altering the structure of the module. In this study, a PET electrode sheet module was fabricated using a cell/module integration. The module was fabricated by connecting the PET electrode sheet (stacked on a busbar-less solar cell) to electrodes via a lamination process. The electrode sheet was fabricated using flat and grooved PET films. In the module to which the A-stage paste was applied, the electrode slipped and disconnected. In contrast, in the module fabricated using the paste electrode sheet cured in B-stage, the electrode was not disconnected. Following the fabrication of the module using the B-stage paste, the efficiency of the module was measured to be 3.173%. Further, the electrode sheet was fabricated by increasing the volume of the electrode in order to reduce the series resistance and establish smooth contact with the solar cell. Experiments were conducted with a grooving line of 110 µm, the dispenser needle diameter of 150-300 µm, and discharging number of 1 to 2. As the discharging needle diameter increased, the amount of paste increased and the electrode resistance gradually decreased. However, the solar cell light absorption area decreased with the increase in the surface area of the electrode, and the short circuit current gradually decreased. Therefore, fabricated module showed a maximum efficiency of 17.012%, which was achieved using a discharging number of 2 and needle diameter of 200 µm.
{"title":"Fabrication and Analysis of Photovoltaic Module with PET Electrode Sheet","authors":"H. Hwang, Dong-Gyu Lim","doi":"10.7836/kses.2022.42.4.105","DOIUrl":"https://doi.org/10.7836/kses.2022.42.4.105","url":null,"abstract":"Currently, the photovoltaic industry is focusing on the development of low-cost modules with increased efficiency by altering the structure of the module. In this study, a PET electrode sheet module was fabricated using a cell/module integration. The module was fabricated by connecting the PET electrode sheet (stacked on a busbar-less solar cell) to electrodes via a lamination process. The electrode sheet was fabricated using flat and grooved PET films. In the module to which the A-stage paste was applied, the electrode slipped and disconnected. In contrast, in the module fabricated using the paste electrode sheet cured in B-stage, the electrode was not disconnected. Following the fabrication of the module using the B-stage paste, the efficiency of the module was measured to be 3.173%. Further, the electrode sheet was fabricated by increasing the volume of the electrode in order to reduce the series resistance and establish smooth contact with the solar cell. Experiments were conducted with a grooving line of 110 µm, the dispenser needle diameter of 150-300 µm, and discharging number of 1 to 2. As the discharging needle diameter increased, the amount of paste increased and the electrode resistance gradually decreased. However, the solar cell light absorption area decreased with the increase in the surface area of the electrode, and the short circuit current gradually decreased. Therefore, fabricated module showed a maximum efficiency of 17.012%, which was achieved using a discharging number of 2 and needle diameter of 200 µm.","PeriodicalId":276437,"journal":{"name":"Journal of the Korean Solar Energy Society","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116074049","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}
Pub Date : 2022-08-30DOI: 10.7836/kses.2022.42.4.001
Benny Putra Utomo, J. Anggono, Dong-Youn Shin
Photovoltaic (PV) modules are incorporated into buildings as constitutional elements in building integrated PVs (BIPVs). BIPVs are evident in daily life as various forms on the roofs or skins of buildings. However, their mediocre color (typically black), has led to poor public acceptance. The development of color BIPVs is required to bestow aesthetic value to buildings. Coloring has been primarily achieved using expensive vacuum deposition processes. However, screen printing is becoming widely recognized as a highly competitive manufacturing technique for the fabrication of color BIPVs. Superior characteristics of screen printing include low cost, simplicity, and scalability. In this study, the formulation of color pastes using light interference pigments for screen printing is explored, because the success of screen-printed color BIPVs primarily depends on printability of these pastes. The screen printability of color pastes based on a commercially available two-part liquid paste and an in-house developed carrier vehicle was evaluated. The relativePV conversion efficiency of a color silicon solar module was 90% compared to a reference silicon solar module.
{"title":"Study on Screen Printable Color Paste Formulation for Color Silicon Solar Modules","authors":"Benny Putra Utomo, J. Anggono, Dong-Youn Shin","doi":"10.7836/kses.2022.42.4.001","DOIUrl":"https://doi.org/10.7836/kses.2022.42.4.001","url":null,"abstract":"Photovoltaic (PV) modules are incorporated into buildings as constitutional elements in building integrated PVs (BIPVs). BIPVs are evident in daily life as various forms on the roofs or skins of buildings. However, their mediocre color (typically black), has led to poor public acceptance. The development of color BIPVs is required to bestow aesthetic value to buildings. Coloring has been primarily achieved using expensive vacuum deposition processes. However, screen printing is becoming widely recognized as a highly competitive manufacturing technique for the fabrication of color BIPVs. Superior characteristics of screen printing include low cost, simplicity, and scalability. In this study, the formulation of color pastes using light interference pigments for screen printing is explored, because the success of screen-printed color BIPVs primarily depends on printability of these pastes. The screen printability of color pastes based on a commercially available two-part liquid paste and an in-house developed carrier vehicle was evaluated. The relativePV conversion efficiency of a color silicon solar module was 90% compared to a reference silicon solar module.","PeriodicalId":276437,"journal":{"name":"Journal of the Korean Solar Energy Society","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124715558","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}
Pub Date : 2022-08-30DOI: 10.7836/kses.2022.42.4.033
Kwang-am Moon, In-han Lee, Hwi-Ung Choi, K. Choi
The solar air–water heater is a combined system of air-type and water-type collectors and a composite collector that can produce hot water and heated air in one system. Although it can maximize heat acquisition by transferring some of the heat lost from the absorbent plate and pipe toward the air duct, the heat acquisition is low due to the low heat capacity. To address this problem, several studies have been conducted using turbulent promoters in ducts. In this study, to improve the air-side heat transfer performance of the solar air–water heater, perforated fins on the bottom side of the absorption plate were arranged in various arrangements. Thereafter, computational fluid dynamics (CFD) was performed according to the flow conditions, and the heat transfer performance and pressure drop characteristics were analyzed. Results indicated that the heat transfer performance improved by at least 1.24 times to a maximum of 2.21 times, and that the pressure drop was in the range of 4.10 ~ 7.38 times, confirming the thermal hydraulic performance parameter (THPP). In the case of the performance coefficient, when perforated fins were attached side by side to the pipe, the highest performance coefficient was 1.18.
{"title":"A Study on the Heat Transfer Performance Having Perforated Fins in Air Channel for Solar Air-water Heater using CFD","authors":"Kwang-am Moon, In-han Lee, Hwi-Ung Choi, K. Choi","doi":"10.7836/kses.2022.42.4.033","DOIUrl":"https://doi.org/10.7836/kses.2022.42.4.033","url":null,"abstract":"The solar air–water heater is a combined system of air-type and water-type collectors and a composite collector that can produce hot water and heated air in one system. Although it can maximize heat acquisition by transferring some of the heat lost from the absorbent plate and pipe toward the air duct, the heat acquisition is low due to the low heat capacity. To address this problem, several studies have been conducted using turbulent promoters in ducts. In this study, to improve the air-side heat transfer performance of the solar air–water heater, perforated fins on the bottom side of the absorption plate were arranged in various arrangements. Thereafter, computational fluid dynamics (CFD) was performed according to the flow conditions, and the heat transfer performance and pressure drop characteristics were analyzed. Results indicated that the heat transfer performance improved by at least 1.24 times to a maximum of 2.21 times, and that the pressure drop was in the range of 4.10 ~ 7.38 times, confirming the thermal hydraulic performance parameter (THPP). In the case of the performance coefficient, when perforated fins were attached side by side to the pipe, the highest performance coefficient was 1.18.","PeriodicalId":276437,"journal":{"name":"Journal of the Korean Solar Energy Society","volume":"23 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120823665","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}
Pub Date : 2022-08-30DOI: 10.7836/kses.2022.42.4.059
Kyung-joo Cho, Yo-sun Yun
Electric heat pump (EHP) systems are widely used for heating and cooling in small-scale shops. They are relatively easy to install and manage. Since 1998, KS C 9306 has been widely used for determining the heating and cooling capacities of EHPs. However, at present, to state with certainty that KS C 9306 is suitable for determining the optimal EHP capacity is difficult, as the standards employed for current building designs are considerably different. For example, the U-value standards for building constructions in 2022 are different from the standards applied in 1998. Studies on residential buildings have been actively conducted to determine the optimal heating and cooling capacities of EHPs; however, research on small-scale non-residential buildings is lacking. This study represents the first step in estimating the optimal heating and cooling capacities of EHPs in small-scale shops. The general design and building envelope information of small-scale shops was analyzed, after which reference models for small-scale shops were developed. For further research, 12 models according to the location, main direction, and U-values are proposed.
电热泵(EHP)系统广泛用于小型商店的供暖和制冷。它们相对容易安装和管理。自1998年以来，KS C 9306已被广泛用于确定EHPs的加热和冷却能力。然而，目前很难肯定地说KS C 9306适用于确定最佳EHP容量，因为当前建筑设计所采用的标准有很大不同。例如，2022年的建筑u值标准与1998年的标准不同。积极进行住宅建筑的研究，以确定环境卫生系统的最佳制热和制冷能力;然而，对于小型非住宅建筑的研究还比较缺乏。本研究是估算小型商店EHPs最优制热和制冷能力的第一步。分析了小型商铺的总体设计和建筑围护结构信息，建立了小型商铺的参考模型。为了进一步研究，根据地理位置、主要方向和u值，提出了12种模型。
{"title":"A Proposal of a Space Model for Calculating Heat Loads of Small Shops","authors":"Kyung-joo Cho, Yo-sun Yun","doi":"10.7836/kses.2022.42.4.059","DOIUrl":"https://doi.org/10.7836/kses.2022.42.4.059","url":null,"abstract":"Electric heat pump (EHP) systems are widely used for heating and cooling in small-scale shops. They are relatively easy to install and manage. Since 1998, KS C 9306 has been widely used for determining the heating and cooling capacities of EHPs. However, at present, to state with certainty that KS C 9306 is suitable for determining the optimal EHP capacity is difficult, as the standards employed for current building designs are considerably different. For example, the U-value standards for building constructions in 2022 are different from the standards applied in 1998. Studies on residential buildings have been actively conducted to determine the optimal heating and cooling capacities of EHPs; however, research on small-scale non-residential buildings is lacking. This study represents the first step in estimating the optimal heating and cooling capacities of EHPs in small-scale shops. The general design and building envelope information of small-scale shops was analyzed, after which reference models for small-scale shops were developed. For further research, 12 models according to the location, main direction, and U-values are proposed.","PeriodicalId":276437,"journal":{"name":"Journal of the Korean Solar Energy Society","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121587151","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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