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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Solar Energy Society
Journal Basic Information
Journal DOI :
The Korean Solar Energy Society
Editor in Chief :
Volume & Issues
Volume 33, Issue 6 - Dec 2013
Volume 33, Issue 5 - Oct 2013
Volume 33, Issue 4 - Aug 2013
Volume 33, Issue 3 - Jun 2013
Volume 33, Issue 2 - Apr 2013
Volume 33, Issue 1 - Feb 2013
Selecting the target year
Wind Farm Design Considering Turbulence Intensity on Complex Terrain
Park, Mi-Ho ; Ko, Kyung-Nam ; Huh, Jong-Chul ;
Journal of the Korean Solar Energy Society, volume 33, issue 6, 2013, Pages 1~11
DOI : 10.7836/kses.2013.33.6.001
The investigation on wind farm design using CFD technique was carried out to reduce turbulence intensity in a wind farm. A potential wind farm in Gasiri of Jeju Island was selected for the design and the commercial S/W of Meteodyn WT was used for applying CFD technique. The initial layout of wind turbines was derived using WindPRO which is mainly used for wind farm design in Korea. Then, the distribution of turbulence intensity on complex terrain was calculated and visible by Meteodyn WT. Based on the distribution, wind turbines were positioned properly. As a result, wind turbines could be deployed at positions with minimum turbulence intensity as well as maximum Annual Energy Production, AEP, using Meteodyn WT. It is necessary to take into account turbulence intensity in wind farm design to avoid wind turbine failure.
The Experimental Research for the Collecting Characteristics of the Passive and Active type Domestic Solar Hot Water Systems
Lee, Dong-Won ; Lee, Kyoung-Ho ;
Journal of the Korean Solar Energy Society, volume 33, issue 6, 2013, Pages 12~18
DOI : 10.7836/kses.2013.33.6.012
Domestic solar hot water system can be divided into a passive type and an active type. In a passive type the storage tank is horizontally mounted immediately above the solar collectors. No pumping is required as the hot water naturally rises into the storage tank from the collectors through thermo-siphon flow. While, in an active type the storage tank is ground- or floor-mounted and is below the level of the collectors; a circulating pump moves water or heat transfer fluid between the storage tank and the collectors. We installed two types solar hot water systems consisting of the same storage tank and collectors at the same place, and were measured and compared typical operating characteristics under the same external conditions. In particular, the daily system performance was presented through the stirring test after the sunset. The results show that the amount of solar radiation obtained for an active type were less than a passive type on a cloudy day, because the operation of the circulation pump stops frequently took place on that day. However, on a sunny day, depending on the stable operation of the circulation pump, the amount of solar radiation obtained for an active type were increased than a passive type.
Turbulence Intensity Effects on Small Wind Turbine Power Performance
Kim, Seokwoo ;
Journal of the Korean Solar Energy Society, volume 33, issue 6, 2013, Pages 19~25
DOI : 10.7836/kses.2013.33.6.019
Energy generation from an instrumented Skystream 3.7 small wind turbine was used to investigate the effect of ambient turbulence levels on wind turbine power output performance. It is widely known that elevated ambient turbulence level results in decreased energy production, especially for large sized wind turbine. However, over the entire wind speed range from cut in to the rated wind speed, the measured energy generation increased as ambient turbulence levels elevated. The impact degree of turbulence levels on power generation was reduced as measured wind speed approached to the rated wind speed of 13m/s.
The Application and Evaluation of Heating and Cooling System by Seawater Heat Source for Research Center Building in Jeju
Park, Jin-Young ; Kim, Sam-Uel ; Chang, Ki-Chang ;
Journal of the Korean Solar Energy Society, volume 33, issue 6, 2013, Pages 26~31
DOI : 10.7836/kses.2013.33.6.026
Use of heat from seawater could be different from the weather conditions of a coastal city and seawater temperatures near the city. It will be a good option to use surface layer water with Heat Pump system for using seawater cooling/heating in Jeju. The study investigates the proper depth for seawater heat gain of Jeju area in Korea. Sampling points are 0, 10, 20, 30m from the surface of the Sea. Seawater temperature does not change significantly according to the depth in winter, while the temperature is quite different according to the depth in summer. In this study, it is analyzed to compare existing system and seawater heat source system for target buildings on Jeju. And this systems are calculated a initial cost.
Measured AEP Evaluations of a Small Wind Turbine using Measured Power Curve ＆ Wind Data
Kim, Seokwoo ;
Journal of the Korean Solar Energy Society, volume 33, issue 6, 2013, Pages 32~38
DOI : 10.7836/kses.2013.33.6.032
In an efforts to encourage renewable energy deployment, the government has initiated so called 1 million green homes program but the accumulated installation capacity of small wind turbine has been about 70kW. It can be explained in several ways such that current subsidy program does not meet public expectations, economic feasibility of wind energy is in doubt or acoustic emission is significant etc. The author investigated annual energy production of Skystream 3.7 wind turbine using measured power curve and wind resource data. The measured power curve of the small wind turbine was obtained through power performance tests at Wol-Ryoung test site. AEP(Annual Energy Production) and CF(Capacity Factor) were evaluated at selected locations with the measured power curve.
A Performance Study on Silica Gel Adsorption Desalination System Utilizing Low Temperature Heat Sources
Hyun, Jun-Ho ; Israr, Farrukh ; Lee, Yoon-Joon ; Chun, Won-Gee ;
Journal of the Korean Solar Energy Society, volume 33, issue 6, 2013, Pages 39~46
DOI : 10.7836/kses.2013.33.6.039
This work introduces a simple one-reactor adsorption desalination system that harnesses low temperature heat sources (solar energy, waste heat), which has been experimentally studied to elicit the most suitable design parameters and operating conditions. The design process of the system was divided into three parts to reflect the operating principle of desalination technology with application of adsorption processes. First, the evaporator for the vaporization of saline water was designed, then the reactor for the adsorption and release of the steam, followed by the condenser for condensation of the fresh water. The specific water yield is measured experimentally with respect to the time while controlling parameters such as heat source temperatures, coolant temperatures, system switching and half-cycle operational times. The present system well demonstrates the applicability of silica gel in relation to adsorption technologies that utilize low temperature heat sources ranging from 60 to
, such as solar energy and waste heat.
A Study on the Analysis of Heating and Cooling Load through Applying Window Film Insulation
Kim, Seok-Hyun ; Cho, Young-Hum ;
Journal of the Korean Solar Energy Society, volume 33, issue 6, 2013, Pages 47~53
DOI : 10.7836/kses.2013.33.6.047
In order to reduce the energy consumption of the building, much effort is being made. The problems are that excessive solar radiation in summer and the heat loss in winter by the increase of window area. To prevent this problems, government limited the window area ratio or the performance of windows in new buildings. In order to reduce energy consumption of the existing buildings, the window film insulation is spotlight because the window film insulation was simple to installation. This study confirmed the performance of the window film insulation and affect to heating & cooling load of buildings. The impact of the window film insulation coating was confirmed by experiment. And this study confirmed the annual heating & cooling load by simulation. As a results, the surface temperature of coated window was higher than the surface temperature of existing window. The window film insulation was increased surface temperature of window. And this study confirmed that the increased surface temperature was slightly affected the room air temperature through experiment of the insulation box. The results of the heating and cooling load by simulation, this study confirmed that the case of coated window film insulation decreased cooling load in summer and increased heating load in winter. Also the annual total heating & cooling load was increased a little in the case of coated the window film insulation.
Prediction of Heating Energy Saving Rate on the Window Type-Focus on the Apartment House
Kim, Kyung-Ah ; Moon, Hyeun-Jun ; Yu, Ki-Hyung ;
Journal of the Korean Solar Energy Society, volume 33, issue 6, 2013, Pages 54~61
DOI : 10.7836/kses.2013.33.6.054
This is study on the glazing performance of the apartment house to predict energy saving rate when the early design stage by calculating heating load. there are various factors of the window type in apartment building to save energy such as window`s U-value, SC or SHGC, window wall ration, frame factor, sunshade coefficient and so on. In this study, we analyzed the heating load focused on the U-value, SC and window wall ration using variable heating degree days method for a small and middle size units
, respectively. Each cases were calculated heating load of the real models compared to standard model to predict energy saving rate. From those cases it was drew the conclusion that were window`s U-value, SC and window wall ration for the small and middle size units to expect 10% energy saving rate at least.
The Development of the Short-Term Predict Model for Solar Power Generation
Kim, Kwang-Deuk ;
Journal of the Korean Solar Energy Society, volume 33, issue 6, 2013, Pages 62~69
DOI : 10.7836/kses.2013.33.6.062
In this paper, Korea Institute of Energy Research, building integrated renewable energy monitoring system that utilizes solar power generation forecast data forecast model is proposed. Renewable energy integration of real-time monitoring system based on monitoring data were building a database and the database of the weather conditions and to study the correlation structure was tailoring. The weather forecast cloud cover data, generation data, and solar radiation data, a data mining and time series analysis using the method developed models to forecast solar power. The development of solar power in order to forecast model of weather forecast data it is important to secure. To this end, in three hours, including a three-day forecast today Meteorological data were used from the KMA(korea Meteorological Administration) site offers. In order to verify the accuracy of the predicted solar circle for each prediction and the actual environment can be applied to generation and were analyzed.
A Study of Integrated SCADA System for Wind Farm to Support Interoperability
Kim, Young-Gon ; Moon, Chae-Joo ; Joo, Yeong-Tae ; Park, Tae-Sik ; Chang, Young-Hak ;
Journal of the Korean Solar Energy Society, volume 33, issue 6, 2013, Pages 70~76
DOI : 10.7836/kses.2013.33.6.070
Recently industrial control systems have been required to ensure intelligent, high tech automation, interconnection and interoperability demands. Therefore, there is a need to redefine the structure concepts of SCADA system for wind power. Also, at this time, the integrated management system is required for the distributed development of wind farms where are needed often interoperability features and exchange information between different wind farms, wind turbines or SCADA systems. In this paper, an integrated structural concepts for SCADA system are defined. Based on this definition of an integrated SCADA system, the basic designs are analyzed on physical layer, system layer and application layer which are corresponded to wind turbine controller, the SCADA server and the SCADA client, and implement HMI. Between the implementation SCADA server and the client, their normal functions were verified at the small scale wind energy test facilities.
A Study on Heating and Cooling Degree-Days Calculation Methods with NCDC Data
Seo, Dong-Hyun ; Song, Yujin ;
Journal of the Korean Solar Energy Society, volume 33, issue 6, 2013, Pages 77~84
DOI : 10.7836/kses.2013.33.6.077
Degree-day method is very simple but essential index to estimate heating and cooling energy demand in buildings. It has been neglected, however, for the simplicity so it is difficult to find any DB for south Korean cities. Even meteorological department of S. Korea doesn`t report the data officially. In this study, current methods that are being used in many countries are investigated and used to calculate degree-days of 35 south Korean cities with 30 years(1981~2010) historical data. The calculation result indicates that the error among 4 major methods are dependent on how daily or hourly temperature are treated in the calculation and how balance point temperature is defined. The errors of the methods are no larger than 6% relative to hourly degree-day method.
Research on Thermal Performance by Different Fins in a Solar Air Heater
Choi, Hwi-Ung ; Hong, Boo-Pyo ; Yoon, Jung-In ; Son, Chang-Hyo ; Choi, Kwang-Hwan ;
Journal of the Korean Solar Energy Society, volume 33, issue 6, 2013, Pages 85~91
DOI : 10.7836/kses.2013.33.6.085
It is essential to reduce the amount of fossil fuel because facing with the natural problem such as a global warming. To achieve this goal, many of interests in the use of renewable energy is growing. Especially, as one of these renewable energy systems, a solar air heater invention has been conducted for enhancing the efficiency of solar air heater. According to this trend, scale-down sized experiment apparatus was constructed and performed for searching a proper fin and confirming the heat transfer performance by fin shape on constant heat condition to enhance efficiency of solar air heater. In this experiment, heat gain, convection heat transfer coefficient, number of transfer units, Nusselt number, Reynold`s number, friction factor, performance factor were investigated in order to evaluate the thermal characteristics based on the real data obtained. By comparison with the each fin performance, a zigzag shape keeping a right angle to the plate had the highest value among them.
DC Offset Current Compensation Method of Transformeless Fuel Cell/PV PCS
Park, Bong-Hee ; Kim, Seung-Min ; Choi, Ju-Yeop ; Choy, Ick ; Lee, Sang-Chul ; Lee, Dong-Ha ; Lee, Young-Kwon ;
Journal of the Korean Solar Energy Society, volume 33, issue 6, 2013, Pages 92~97
DOI : 10.7836/kses.2013.33.6.092
This paper proposes DC offset current compensation method of transformerless fuel cell/PV PCS. DC offset current is generated by the unbalanced internal resistance of the switching devices in full bridge topology. The other cause is the sensitivity of the current sensor, which is lower than DSP in resolution. If power converter system has these causes, the AC output current in the inverter will generate the DC offset. In case of transformerless grid-connected inverter system, DC offset current is fatal to grid-side, which results in saturating grid side transformer. Several simulation results show the difficulties of detecting DC offset current. Detecting DC offset current method consists of the differential amplifiers and PWM is compensated by the output of the Op amp circuit with integrator controller. PSIM simulation verifies that the proposed method is simpler and more effective than using low resolution current sensor alone.
A Study on the Present State of Duty Performance According to the RPS System and Improvement Plan
Kim, Jun-Hui ; Lee, Eung-Jik ;
Journal of the Korean Solar Energy Society, volume 33, issue 6, 2013, Pages 98~104
DOI : 10.7836/kses.2013.33.6.098
At the moment, in Korea, over 90% of energy resources depend on imports, and nearly 60% of electric energy is produced using fossil fuel. Therefore, the government adopted the Climatic Change Convention and has implemented the RPS system since 2012 to actively cope with the dependence on imported energy, and to grow and expand the new renewable energy industry. This study examined the performance results of mandatory supply of solar photovoltaic energy and non-solar photovoltaic energy assigned to providers and the present state after implementation of the RPS system. As a result, the achievement rate in 2012 was 64.7%. Especially, solar photovoltaic energy showed a high achievement rate of 95.7%, whereas non-solar photovoltaic energy showed a low achievement rate of 63.3% due to several problems and was highly dependent on the government. In 2013, the burden of each provider has increased due to more mandatory supply and addition of unfulfilled supply of 2012, and the separate mandatory supply of solar photovoltaic energy established for protection of the solar photovoltaic market is restricting investment. Therefore, there is a need to assign mandatory supply in consideration of the available amount of each new renewable energy.