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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Solar Energy Society
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Journal DOI :
The Korean Solar Energy Society
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Volume & Issues
Volume 34, Issue 6 - Dec 2014
Volume 34, Issue 5 - Oct 2014
Volume 34, Issue 4 - Aug 2014
Volume 34, Issue 3 - Jun 2014
Volume 34, Issue 2 - Apr 2014
Volume 34, Issue 1 - Feb 2014
Selecting the target year
The New MPPT Algorithm for the Dynamic MPPT Efficiency
Ko, Suk-Whan ; Jung, Young-Seok ; So, Jung-Hun ; Hwang, Hye-Mi ; Ju, Young-Chul ;
Journal of the Korean Solar Energy Society, volume 34, issue 6, 2014, Pages 1~10
DOI : 10.7836/kses.2014.34.6.001
The efficiency of the maximum power point tracking(MPPT) of inverter which is used in grid-connected photovoltaic systems is changed according to dynamic environment conditions. Hence, this paper evaluates the performance of the proposed method and other MPPT algorithm on the basis of European Efficiency Test(EN50530). The modeling of MPPT algorithm is made by the Matlab & Simulink. In the result of simulation, the more control period is shorter, the more MPPT efficiency is higher. Also, the Proposed MPPT algorithm has higher performance than other MPPT algorithm with no regard to control period.
Hydrogen Production with High Temperature Solar Heat Thermochemical Cycle using CeO
Lee, Jin-Gyu ; Seo, Tae-Beom ;
Journal of the Korean Solar Energy Society, volume 34, issue 6, 2014, Pages 11~18
DOI : 10.7836/kses.2014.34.6.011
Two-step water splitting thermochemical cycle with
foam device was investigated by using a solar simulator composed of 2.5 kW Xe-Arc lamp and mirror reflector. The hydrogen production of
foam device depending on reaction temperature of Thermal-Reduction step and Water-Decomposition step was analyzed, and the hydrogen production of
foam devices was compared. As a result, the amount of reduced
considerably varies according to the reaction temperature of Thermal-Reduction step. and hydrogen production was not much when the amount of reduced
decreased even if the reaction temperature of Water-Decomposition step was high. Therefore, it is very important to keep the reaction temperature of Thermal-Reduction step high in two-step thermochemical cycle with
A Study on Analysis of Reserves and Available Capacity of Unutilized Energy in Rural Community
Park, Mi-Lan ; Ryoo, Yeon-Su ; Kim, Jin-Wook ; Lee, Yong-Uk ; Bae, Sung-Don ; Chae, Kap-Byung ;
Journal of the Korean Solar Energy Society, volume 34, issue 6, 2014, Pages 19~25
DOI : 10.7836/kses.2014.34.6.019
Alternative sources of energy take a higher interest in order to reduce the greenhouse gas under the Climate Change Convention, fossil fuel consumption, and lower social anxiety about nuclear power such as crisis involving the Fukushima plant, problem of obsolete equipment. The energy consumption of agriculture, forestry and fisheries in South Korea is 3,082,000toe by 2011, reliance on electrical energy(35%) and oil(57.2%) is very high with 92.2%. In this study, we examined reserves and available capacity of temperature difference energy for thermal discharge from plant, treated sewage, river water, dam, and agricultural reservoir in rural community. Reserves of unutilized energy are 455,735Tcal/yr in rural community, these accounts for 78% of total reserves 582,385Tcal/y. Thermal discharge from plant has the most reserves of unutilized energy in rural community, it is estimated that it has the reserves of 277,410Tcal/y. Available capacity of unutilized energy in rural community is total 134,147Tcal/y, thermal discharge from plant available for heating is the most 128,035Tcal/y, and it shows in the order of treated sewage 4,318Tcal/y, river water 1,653Tcal/y, and reservoir 141Tcal/y. Elevating temperature area of green house by 2012 is 21,208ha. The amount of energy required for heating the greenhouse a year is dbout 11,365Tcal/y with 8.5% of the total available capacity of unutilized energy.
Study on Energy Saving Possibilities through Analysis of Environment Control Elements & Natural Ventilation Performance using the CFD & Measurement
Oh, Byoungchull ; Lee, Sunyoung ;
Journal of the Korean Solar Energy Society, volume 34, issue 6, 2014, Pages 27~37
DOI : 10.7836/kses.2014.34.6.027
Heat island is caused by changes of land coverage structure of cities and use of energy in buildings. As a result energy use in buildings get to increase further followed by rising of GHG emission and deteriorating climate change. Eco-friendly housing complex is a kind of plan that applies environmental control elements like water and green spaces to housing complex. With these methods, it can be expected to create thermal environment of indoor and outdoor. In this paper quantitative examination is studied on using CFD to find out the effects of river, water permeable, parks and planting on thermal environment. And by comparing field measurements with CFD results which are aimed to development phase housing complex, feasibility and usability of the CFD analysis results are confirmed. And also, analysis on the ventilation performance followed by natural ventilation system is analyzed by selecting one building in housing complex. Based on the results, the possibilities of energy reduction through making thermal environment and applying natural ventilation are studied. With these outcomes, creating thermal conditions and using natural ventilation would be contributed to GHG reduction.
Application of the Daylight Factor Formula with the Modified Split Flux
Yun, Su-In ; Yun, Gyeong ; Kim, Kang-Soo ;
Journal of the Korean Solar Energy Society, volume 34, issue 6, 2014, Pages 39~47
DOI : 10.7836/kses.2014.34.6.039
Daylighting has a great effect on people inside the room. It is also closely related to the lighting energy consumption. Daylight factor(DF) is a very important index for evaluation of the daylighting in overcast sky. The objective of this study is to verify the suitability of the Tregenza's Modified Split Flux formula for the calculation of the daylight factor. We compared the daylight factors calculated by two methods; one by a measurement with 1/5 scale model and the other by the Daysim program. We used variables for verification as window wall ratios(WWR) and angles of the sky visible. As a result, daylight factor calculated by Modified Split Flux is similar to the measurement when more daylight enters the inside. And error is significantly increased when the angle of the sky visible is
Performance Estimation of Hybrid Solar Air-Water Heater on Single Working of Heating Medium
Choi, Hwi-Ung ; Yoon, Jung-In ; Son, Chang-Hyo ; Choi, Kwang-Hwan ;
Journal of the Korean Solar Energy Society, volume 34, issue 6, 2014, Pages 49~56
DOI : 10.7836/kses.2014.34.6.049
Research about hybrid solar air-water heater that can make heated air and hot water was conducted as a part of improving efficiency of solar thermal energy. At this experiment, ability of making heating air and hot water was investigated and compared with traditional solar air heater and flat plate solar collector for hot water when air or liquid was heated respectively. Comparing hybrid solar air-water heater that used in this experiment to other solar air heater studied already, it has a lower efficiency at same mass flow rate. Air channel structure, fin's shape and arrangement in the air channel result in these difference then the ability of air heating need to be improved with changing these thing. In case of making hot water, performance was shown as similar with traditional system although the air channels were established beneath absorbing plate. But the heat loss coefficient was shown higher value by installing of air channel. Also the performance of hot water making was shown lower value at same liquid mass flow rate with traditional flat plate solar collector for hot water. So the necessity of performance improvement at lower mass flow rate of each heating medium can be confirmed.
Dynamic performance analysis of flat plate solar collector system according to weather conditions and capacity of heat storage tank
Park, Bae-Duck ; Kim, Gew-Deok ; Kim, Kyoung-Hoon ;
Journal of the Korean Solar Energy Society, volume 34, issue 6, 2014, Pages 57~65
DOI : 10.7836/kses.2014.34.6.057
Solar energy has attracted wide attention as a promising renewable energy source. The goal of this paper is to estimate the dynamic performance of solar flat plate collector system according to the weather conditions and the capacity of heat storage tank. This study provides a detailed description of the modeling methods and materials of the system. The effects of the daily clearness index and the volume of the heat storage tank on the hourly and daily performances of the system are numerically investigated. Special attention is focused on the important system variables including the solar insolation on the collector surface, useful energy, heat loss at the collector, and collector efficiency.
Thermal Deformation Analysis of a Scroll Compressor for Automobile according to the Change of Materials
Lee, Hyoungwook ; Lee, Geunan ; Kim, Jeongbae ;
Journal of the Korean Solar Energy Society, volume 34, issue 6, 2014, Pages 67~74
DOI : 10.7836/kses.2014.34.6.067
An inverter scroll compressor is used for the air conditioning in cars. Scrolls would be changed from the aluminum material to the magnesium material in order to satisfy the light weight trends of cars. The material changing influences on the scroll dimensions particularly the gap between two scrolls. Since the larger gap declines the performance of the compression, the gap between wraps of scrolls or the gap between wraps of scrolls to the plate of the opposite scroll is regarded as an important design variable. This paper is focused on the effects of the thermal stress due to the materials changing. The temperature difference between the inlet and the outlet is about 60 degrees and the highest operating temperature in the compressor is less than 110 degrees. The level of thermal stresses in the magnesium scroll is less than the result from aluminum one. The trend of the deformation is revealed that the normal directional deformation is 2 times lager than the in-plane directional deformation. Therefore the gap between the top of the wrap to the plate of the opposite scroll become more important than the other gaps. The orbiting scroll deforms larger than the fixed scroll by the thermal stresses. The deformation of the magnesium scroll is about 10% lager than that of the aluminum scroll. This value is similar to the ratio of the coefficients of thermal expansion of two materials. At the initial design stage, the results give many useful guides to engineers to propose gaps between parts.
Comparing Solar Heat Shading Performances of Internal Blinds in the Summer
Park, Eun-Mi ; Choi, Dong-Ho ; Park, Min-Yong ; Lee, Kyung-Hee ;
Journal of the Korean Solar Energy Society, volume 34, issue 6, 2014, Pages 75~83
DOI : 10.7836/kses.2014.34.6.075
Heat loss through windows and doors occupies 20 to 45% of the total heat loss in building. It accounts for a large proportion of the total heat loss in building. In order to suppress the amount of heat flow through the windows and doors were considered actions such as reinforcement of insulation performance of window, adoption of low-e glass, and installation of solar heat shading device. The Purpose of this study is to compare solar heat shading performances of 3 types of internal blinds in the summer. In order to verify the solar heat shading performances of the blinds, a roll blind, blind A(Venetian blind) and blind B(Daylight guiding venetian blind)were installed in the four rooms with the same environmental conditions. As a result of the experiment, the blind B, blind A, roll blind showed an excellent performance in that order. Its because the blind B is made of aluminum materials coated with special paints on surface. It doesn't converted to long wave by short wave light. and it is reflected to short wave to outside.
A Study on the Cooling Characteristics and Subcooling Improvement of TMA-Water Clathrate Compound
Park, Seul-Hyun ; Kim, Chang-Oh ;
Journal of the Korean Solar Energy Society, volume 34, issue 6, 2014, Pages 85~92
DOI : 10.7836/kses.2014.34.6.085
This study carried out experimental on the cooling characteristics of clathrate compound including TMA(Tri-Methyl-Amine ;
) as a low temperature latent heat storage material. And additive was used for subcooling improvement of TMA-water clathrate compound. The conclusion of above study is as following ; TMA 25wt%-water clathrate compound is shown stable phase change and low subcooling degree. The subcooling was improved in the case ethanol(
) 0.5wt% is added to TMA 25wt%-water clathrate compound.
Energy Consumption status of Apartment Buildings and Influence of Various Factors on Energy Consumption
Kim, Yong-In ; Song, Seung-Yeong ;
Journal of the Korean Solar Energy Society, volume 34, issue 6, 2014, Pages 93~102
DOI : 10.7836/kses.2014.34.6.093
The aim of this study is to analyze the influence of various factors on energy consumption of apartment buildings. Energy consumption data of the Green Together, integrated building energy management system maintained by the government were used, and end-use and primary energy consumption data of 2012 were analyzed for 181 apartment complexes completed between 2004 and 2011 in Seoul. Energy consumption by use, source and heating type were analyzed. Then, energy consumption trends were analyzed and suggested according to energy efficiency ratings, number of households, areas for exclusive use, number of floors, core types, building types, orientations and completion years.
A Study on the Geothermal Heat Pump System Performance Analysis according to Water Flow Rate Control of the Geothermal Water Circulation Pump
Jung, Young-Ju ; Jo, Jae-Hun ; Kim, Yong-Shik ; Cho, Young-Hum ;
Journal of the Korean Solar Energy Society, volume 34, issue 6, 2014, Pages 103~109
DOI : 10.7836/kses.2014.34.6.103
It is important to control the amount of supply water flow rate at all kinds of HVAC systems in order to maintain IAQ and energy efficiency. The most of buildings installed geothermal heat pumps is using fixed water flow rate in spite of the excellent performance of geothermal heat pumps. Especially when the air-conditioning load is low, the flow rate control may be possible to save energy to operate. However, it is effective to apply the variable flow control system in order to reduce energy consumption. Therefore, the purpose of this study, change a water flow rate and improve the whole performance of the geothermal heat pump. Geothermal heat pump system is modeled after the selection of the applied building, by setting the flow rate control to be analyzed through a simulation of performance evaluation. Building energy saving according to the flow rate of the ground circulating water analyze quantitatively and to investigate the importance of the flow control.
Comparison of Meteorological Elements by Type of City during Summer Season - Focus on the Daegu Metropolitan City and the Surrounding Four Regions -
Choi, Dong-Ho ; Lee, Bu-Yong ; Jeong, Hyeong-Se ;
Journal of the Korean Solar Energy Society, volume 34, issue 6, 2014, Pages 111~122
DOI : 10.7836/kses.2014.34.6.111
The purpose of this study is to understand relation of meteorological elements of air temperature, relative humidity and vapor pressure of four cities with Daegu. The followings are main results from this study. 1) There is very high correlation of meteorological elements according to distance between city and city. 2) In case of seaside town at Pohang, there were little changes than other cities for temperature, humidity and vapor pressure. 3) It was analysed stable and similar diurnal variation in water vapor pressure than air temperature and relative humidity at all observation site.