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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
Editor in Chief :
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
A Study on the Optimization of Power Consumption Pattern using Building Smart Microgrid Test-Bed
Lee, Sang-Woo ; Kang, Jin-Kyu ; Lee, Dong-Ha ;
Journal of the Korean Solar Energy Society, volume 34, issue 4, 2014, Pages 1~7
DOI : 10.7836/kses.2014.34.4.001
The microgrid system is the combination of photovoltaic(PV) array, load, and battery energy storage system. The control strategies were defined as multi-modes of operation, including rest operation without use of battery, power charging, and power discharging, which enables grid connected mode or islanded mode. Photovoltaic power is a problem of the uniformity of power quality because the power generated from solar light is very sensitive to variation of insolation and duration of sunshine. As a solution to the above problem, energy storage system(ESS) is considered generally. There fore, in this study, we did basic research activities about optimization method of the amount of energy used, using a smart microgrid test-bed constructed in building. First, we analyzed the daily, monthly and period energy pattern amount of power energy used, and analyzed PV power generation level which is built on the roof. Utilizing building energy pattern analysis data, we was studied an efficient method of employing the ESS about building power consumption pattern and PV generation.
Current Sensing Atomic Force Microscopy Study of the Morphological Variation of Hydrated Pronton Exchange Membrane
Kwon, Osung ; Lee, Sangcheol ; Son, ByungRak ; Lee, Dong-Ha ;
Journal of the Korean Solar Energy Society, volume 34, issue 4, 2014, Pages 9~16
DOI : 10.7836/kses.2014.34.4.009
A proton exchange membrane is a core component in the proton exchange membrane fuel cell because the role of proton exchange membrane(PEM)is supplying proton conductivity to fuel cell, a gas separator, and insulating between an anode and cathode. Among various role of PEM, supplying proton conductivity is the most important and the proton conductivity is strongly related the structural evolution of PEM by hydration. Thus a lot of studies have done by past few decade based on small angle X-ray scattering and wide angle X-ray scattering for understanding morphological structure of the PEM. Resulting from these studies, several morphological models of hydrated PEM are proposed. Current sensing atomic force microscopy (CSAFM) can map morphology and conductance on the membrane simultaneously. It can be the best tool for studying heterogenous structured materials such as PEM. In this study, the hydration of the membrane is examined by using CSAFM. Conductance and morphological images are simultaneously mapped under different relative humidity. The conductance images, which are mapped from different relative humidity, are analyzed by statistical methode for understanding ionic channel variation in PEM.
Design and Development of 600 W Proton Exchange Membrane Fuel Cell
Kim, Joo-Gon ; Chung, Hyun-Youl ; Bates, Alex ; Thomas, Sobi ; Son, Byung-Rak ; Park, Sam ; Lee, Dong-Ha ;
Journal of the Korean Solar Energy Society, volume 34, issue 4, 2014, Pages 17~22
DOI : 10.7836/kses.2014.34.4.017
The design of a fuel cells stack is important to get optimal output power. This study focuses on the evaluation of fuel cell system for unmaned aerial vehicles (UAVs). Low temperature proton exchange membrane (LTPEM) fuel cells are the most promising energy source for the robot applications because of their unique advantages such as high energy density, cold startup, and quick response during operation. In this paper, a 600 W open cathode LTPEM fuel cell was tested to evaluate the performance and to determine optimal operating conditions. The open cathode design reduces the overall size of the system to meet the requirement for robotic application. The cruise power requirement of 600 W was supported entirely by the fuel cell while the additional power requirements during takeoff was extended using a battery. A peak of power of 900 W is possible for 10 mins with a lithium polymer (LiPo) battery. The system was evaluated under various load cycles as well as start-stop cycles. The system response from no load to full load meets the robot platform requirement. The total weigh of the stack was 2 kg, while the overall system, including the fuel processing system and battery, was 4 kg.
An Immune Algorithm based Multiple Energy Carriers System
Son, Byungrak ; Kang, Yu-Kyung ; Lee, Hyun ;
Journal of the Korean Solar Energy Society, volume 34, issue 4, 2014, Pages 23~29
DOI : 10.7836/kses.2014.34.4.023
Recently, in power system studies, Multiple Energy Carriers (MECs) such as Energy Hub has been broadly utilized in power system planners and operators. Particularly, Energy Hub performs one of the most important role as the intermediate in implementing the MECs. However, it still needs to be put under examination in both modeling and operating concerns. For instance, a probabilistic optimization model is treated by a robust global optimization technique such as multi-agent genetic algorithm (MAGA) which can support the online economic dispatch of MECs. MAGA also reduces the inevitable uncertainty caused by the integration of selected input energy carriers. However, MAGA only considers current state of the integration of selected input energy carriers in conjunctive with the condition of smart grid environments for decision making in Energy Hub. Thus, in this paper, we propose an immune algorithm based Multiple Energy Carriers System which can adopt the learning process in order to make a self decision making in Energy Hub. In particular, the proposed immune algorithm considers the previous state, the current state, and the future state of the selected input energy carriers in order to predict the next decision making of Energy Hub based on the probabilistic optimization model. The below figure shows the proposed immune algorithm based Multiple Energy Carriers System. Finally, we will compare the online economic dispatch of MECs of two algorithms such as MAGA and immune algorithm based MECs by using Real Time Digital Simulator (RTDS).
An Analysis of Heating and Cooling Energy and Effect on Outdoor Air Cooling according to Building Type of Apartment Complex
Roh, Ji-Woong ;
Journal of the Korean Solar Energy Society, volume 34, issue 4, 2014, Pages 31~38
DOI : 10.7836/kses.2014.34.4.031
This study makes three apartment building complex an object of analyzing representative building types and energy consumption rate of house holds, and effect of outdoor air cooling. Recently created apatrment complex is composed of very various types of building, plan, and orientation etc. But, it is difficult to remark conclusively that these various types of buildings are designed energy-effectively. Because architects are hard to find useful energy design guideline for decision making. By the preceding study, the present condition and problem about this subject is grasped, apartment building types were examined and representative types were extracted. In this study, energy simulation was conducted, and the effect to outdoor air cooling was analyzed about representative types of the subject apartment complex. It is expected that this analysed results will be basic data for the more integrated study. Research consequence can be summarized as follow: 1) Besides solar gain, household layout of building, orientation, and plan etc. effects compositively on energy consumption rate. 2) The effect of ourdoor air cooling in building of tower type can be improved by arranging households appropriately.
SIMS Investigation of Black Cr Solar Selective Coatings
Lee, Kil-Dong ;
Journal of the Korean Solar Energy Society, volume 34, issue 4, 2014, Pages 39~44
DOI : 10.7836/kses.2014.34.4.039
The elemental composition of electro-deposited black Cr solar selective coatings before and after heating in air by using secondary ion mass spectrometry (SIMS) was investigated for optical property analysis. In addition, black Cr selective coating exposed by solar radiation for 5 months was compared with heated sample. SIMS investigation shows that
bearing ions were related to a near surface region of CrOH and CrO compound. The optical degradation of this coating after heating at
reveals that diffusion of the Cu and Ni elements in substrate material, the chemical interactions adjacent to the interface, and the interface width broadening.
The numerical analysis of performance of OTEC system with vapor-vapor ejector
Yoon, Jung-In ; Son, Chang-Hyo ; Ye, Byung-Hyo ; Ha, Soo Jeong ; Choi, In-Soo ; Lee, Ho-Saeng ; Kim, Hyeon-Ju ;
Journal of the Korean Solar Energy Society, volume 34, issue 4, 2014, Pages 45~50
DOI : 10.7836/kses.2014.34.4.045
In this paper, the Ocean Thermal Energy Conversion(OTEC) with vapor-vapor ejector is proposed newly. At this OTEC system, a vapor-vapor ejector is installed at inlet of condenser. The vapor-vapor ejector plays a very important role in increasing of the production work of low-stage turbine throughout the decrement of outlet pressure of ejector. The performance analysis is conducted for optimizing the system with HYSYS program. The procedure of performance analysis consists of outlet pressure of high turbine, the mass ratio of working fluid at separator, total working fluid rate, and nozzle diameters of vapor-vapor ejector. The main results is summarized as follows. The nozzle diameter is most important thing in this study. When each nozzle diameter of vapor-vapor ejector is 10 mm, the efficiency of OTEC system with vapor-vapor ejector shows the highest value. So it is necessary to set the optimized nozzle diameters of vapor-vapor ejector for achieving the high efficiency OTEC power system.
The performance comparison of vapor-vapor ejector OTEC system using wet refrigerants
Yoon, Jung-In ; Son, Chang-Hyo ; Kim, Young-Bok ; Ye, Byung Hyo ; Ha, Su-Jeong ; Lee, Ho-Saeng ; Kim, Hyeon-Ju ;
Journal of the Korean Solar Energy Society, volume 34, issue 4, 2014, Pages 51~56
DOI : 10.7836/kses.2014.34.4.051
In this paper, OTEC(Ocean Thermal Energy Conversion) system with vapor-vapor ejector is newly proposed. And 6 wet refrigerants are applied into the proposed OTEC system for performance comparison. The results of comparison performance are as follows. In the view of system efficiency, R32/R744(90:10) has the highest efficiency among the 6 refrigerants. In case of evaporation capacity, pump work and mass flow rate of working fluid, R744, R717 and R717 is lowest value, respectively. As this results, the vapor-vapor ejector is able to increase the efficiency of system. And It is necessary to select the optimized working fluid considering environmental and economic factors.
A Basic Study on Feasibility Analysis for Solar Energy Facility using Standard Broiler House Roof
Kim, Jin-Hyun ; Jung, Sung-Jin ; Kim, Tae-Wook ; Choi, Jun-Hak ; Ha, Yu-Shin ;
Journal of the Korean Solar Energy Society, volume 34, issue 4, 2014, Pages 57~65
DOI : 10.7836/kses.2014.34.4.057
In order to reduce greenhouse gas emissions in recent agricultural energy and increase the energy self-sufficiency rate of each farmer, it is extremely important to expand the supply of solar energy using unused space of agricultural facilities, roof. This study surveyed and analyzed the environmental and administrative factors such as problems according to the structure, azimuth and latitude of broiler houses and stability of standard broiler houses required to use broiler house roof based on the poultry houses in Sangju-si. The results can be summarized as follows: 55.6% of the solar energy facilities of according to the classification of arable lands of broiler houses were available, and 31.7% of them were available by classifying according to the azimuth. However, 20.6% of them were available in the survey considering all the arable land and azimuth. In the roof inclination of the broiler houses, from 20 to
was the most common, 30 broiler houses. The broiler houses with the roof inclination more than
accounted for 63% of the total. It was considered that the inclination was generally proper. In the structural safety, only 3 broiler houses that were constructed as a standard broiler house were available. In practice, all but one broiler house was inappropriate to expand the solar energy project using roof. The solar thermal facility weighed
in total: the frame and solar thermal collector weighed
, respectively. The standard broiler house required to be internally reinforced. This study suggested a plan for internal reinforcement and a feasible plan because there were problems with structural safety when installing solar thermal and photovoltaic systems.
Analyzing effects of the BESS for wind farm in Jeju Island
Lee, Doheon ; Kim, Eel-Hwan ; Kim, Ho-Min ; Kim, Seung Hyun ;
Journal of the Korean Solar Energy Society, volume 34, issue 4, 2014, Pages 67~74
DOI : 10.7836/kses.2014.34.4.067
The fluctuation of the output power of wind farms will be able to cause the impact on the Jeju power system such as power quality and stability. To settle the matter, many researchers have proposed the use of the BESS(Battery Energy Storage System) in the wind farm. In this paper, The BESS is applied to each wind farms for mitigating the fluctuation of wind power output. The BESS is controlled for smoothing the output of wind farms. Two kinds of simulation will be carried out. First, the simulation results by using PSCAD/EMTDC simulation program are compared to the measured data from the real power grid in Jeju Island. The other is to analyze the output of wind farms when the BESS is applied to the simulation works. The simulation results will demonstrate the effectiveness of using BESS to stabilize for power grid in Jeju Island.
A Study on the Energy Consumption Characteristic by Building Envelope of Apartment Housing in Busan Metropolitan City
Yee, Jurng-Jae ; Kim, Hwan-Yong ; Kim, Seung-Hee ;
Journal of the Korean Solar Energy Society, volume 34, issue 4, 2014, Pages 75~81
DOI : 10.7836/kses.2014.34.4.075
In this paper we made energy consumption units of glass curtain wall type apartment and general apartment in Busan metropolitan city and compared energy consumption characteristics by building envelope. The monthly electricity consumption units of general apartment were shown in the range of
which were indicated higher value in January, February, August and September with little variation. On the other hand, in case of glass curtain wall type apartment, monthly electricity consumption units were represented in the range of
with significant fluctuations monthly, which were outstandingly high in July, August and September. The monthly city gas consumption units of general apartment were found to be in the range of
, while glass curtain wall type apartment were within
. City gas consumption units from December to March were shown highly in both type apartments. The monthly energy consumption units of general apartment were found to be within
, while glass curtain wall type apartment were within
. Energy consumption units of glass curtain wall type apartment were suggested 4.84 times higher than those of general apartment.
The Characteristic of Enterprise Groups and the Demand-Supply Relation Analysis in the Korea Solar Energy Industry
Park, Chang-Kirl ;
Journal of the Korean Solar Energy Society, volume 34, issue 4, 2014, Pages 83~90
DOI : 10.7836/kses.2014.34.4.083
South Korea's solar energy industry has been made vertical integration and specialization as part of the restructuring in the downturn of the world economy and the oversupply situation of raw materials. This study is to understand the characteristics of the solar energy industry, using data to systematic approach. In this study, it was defined the major business of firms as 22 business types and classified into 5 enterprise groups as technology and business strategy. After that, It was deduced features of Enterprise group by the statistical analysis and looked to draw a map of the industrial structure by social network analysis using the information on companies' demand and supply.
A Study on the Design Concept of DSC Window by Color and Installation Position
Lee, Ki-Won ; Lee, Eung-Jik ;
Journal of the Korean Solar Energy Society, volume 34, issue 4, 2014, Pages 91~99
DOI : 10.7836/kses.2014.34.4.091
The purpose of the study is to apprehend the preference of occupants to colors and installation locations for DSC combined windows and doors, and suggest a concept to optimize the design and function of windows and doors. A miniature model was made applying green, blue, and red colored DSC windows and doors to survey preference about DSC colors and applied location. And a survey was accomplished to 140 subjects by showing pictures of the model and the result of the survey became the basis for suggesting a concept to design DSC integrated windows and doors. Through the survey, blue color and upper part were chosen as the highest level of satisfaction in the situation of external brightness and residence. On the contrary to this, red color was chosen as the lowest level of preference when applied to both of upper and lower parts of winders and doors. Therefore, it's expected that, if various patterns of texture are developed for blue colored DSC, and installation is arranged based on upper part of windows and doors where lighting condition and comfort are less affected, then, conditions of brightness, view, and residents satisfaction will be equally fulfilled.
A Study on the Calculation of Standard Data for Energy Use Plan of Industry Complex
Suh, Kwang-Soo ;
Journal of the Korean Solar Energy Society, volume 34, issue 4, 2014, Pages 101~109
DOI : 10.7836/kses.2014.34.4.101
The Consultation about Energy Use Plan is prescribed by the Energy Use Rationalization Act. This study calculated the Standard Data for Energy Use Plan of Industry Complex by the 9th Korean Standard Industrial Classification Divisions so that the energy demand reflecting the industrial technology change and characteristics of Manufacturing Divisions would predict. To achieve this aim, analysis on thousands of data in Energy Consumption Report Forms reported from industries which annual consumption of energy exceeds 2,000toe from 2009 to 2010 was carried out. The results showed that calculated overall mean fuel basic unit decrease, electricity basic unit increase and energy basic unit increase compared to that of the Notification No. 2002-130 of the Ministry of Commerce, Industry and Energy, therefore it means that heat source of energy facilities transferred from fuel to electricity. Also resultingly suggests that the related notification, code etc. are amended as soon as possible.
Analysis on Daily Variation Mechanism of Short-wave Radiation between Downtown and Suburban Area during Summer Season
Choi, Dong-Ho ; Lee, Bu-Yong ; Jeong, Hyeong-Se ;
Journal of the Korean Solar Energy Society, volume 34, issue 4, 2014, Pages 111~122
DOI : 10.7836/kses.2014.34.4.111
The purpose of this study is to understand daily variation of short-wave radiation trends according to the state of surface and observation of atmosphere conditions in downtown and suburban observation area. The followings are main results from this study. 1) We found out daily air temperature variation of downtown is less than that of suburban area because of bigger heat capacity of artificial elements such as massive buildings and pavements. 2) It is more effective to estimate of air condition by water vapor pressure than relative humidity in the atmosphere. 3) The difference of solar radiation ratio between downtown and suburban area is dependant on different atmosphere conditions at two observation stations.
Design of Hybrid System for Battery Charge·Discharge using Photovoltaic/Fuel cell
Park, Bong-Hee ; Jo, Yeong-Min ; Choi, Ju-Yeop ; Cho, Sang-Yoon ; Choy, Ick ; Lee, Dong-Ha ;
Journal of the Korean Solar Energy Society, volume 34, issue 4, 2014, Pages 123~129
DOI : 10.7836/kses.2014.34.4.123
Photovoltaic and fuel cell systems can be used as power source in mobile robots. At this time the photovoltaic system generally generate power in daytime. The starting time of fuel cell is slower than the lithium battery. To compensate for these disadvantages, a battery charge-discharge system is used. Especially the bi-directional converter is used mainly in the charge-discharge method. The controller in a buck converter controls the input voltage of the converter to meet the maximum power point tracking(MPPT) performance. First of all, the simulations of hybrid system for battery charge-discharge system in each step simulated using solar and fuel cell modeling as input source in PSIM. Experiment of the buck and bi-directional converter system is conducted through using photovoltaic/fuel cel simulator(pCube) instead of solar and fuel cell. This hybrid system for battery charge discharge using photovoltaic/fuel cell generates emergency power for the communication system in mobile robot.