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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Solar Energy Society
Journal Basic Information
Journal DOI :
The Korean Solar Energy Society
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Volume & Issues
Volume 30, Issue 6 - Dec 2010
Volume 30, Issue 5 - Oct 2010
Volume 30, Issue 4 - Aug 2010
Volume 30, Issue 3 - Jun 2010
Volume 30, Issue 2 - Apr 2010
Volume 30, Issue 1 - Feb 2010
Selecting the target year
A study on electronic braking system using wind power synchronous generator's armature reaction
Park, Gui-Yeol ; Moon, Chae-Joo ; Cheang, Eui-Heang ; Chang, Yung-Hak ; Kim, Eui-Sun ;
Journal of the Korean Solar Energy Society, volume 30, issue 4, 2010, Pages 1~8
The mechanical parts of small windp ower generator less than 10kW are manufactured in the form of removing most of the accelerators. The braking system to protect blade from damages caused by high wind speed is manufactured in a manner having apparatus system(furling), manual brake or no brake. This study is on braking system in small size wind power generator, and carried out survey as following steps by applying electric braking system which uses armature reaction. We explained the principle of electric braking system and the principle of existing braking system. Also, this paper interpreted short circuit current through open circuit and short circuit, as well as checking brake system's action using armature reaction with real construction of control device.
The study for calculating the geometric average height of Deacon equation suitable to the domestic wind correction methodology.
Cheang, Eui-Heang ; Moon, Chae-Joo ; Jeong, Moon-Seon ; Jo, Kyu-Pan ; Park, Gui-Yeol ;
Journal of the Korean Solar Energy Society, volume 30, issue 4, 2010, Pages 9~14
The main cause of global warming is carbon dioxide generated from the use of fossil fuels, and active research on the reduction of carbon is in progress to slow down the increasing global warming. Wind turbines generate electricity from kinetic energy of wind and are considered as representative for an energy source that helps to reduce carbon emission. Since the kinetic energy of wind is proportional to the cube of the wind speed, the intensity of wind affects wind farm construction validity the most. Therefore, to organize a wind farm, validity analysis should be conducted first through measurement of the wind resources. To facilitate the approval and permission and reduce installation cost, measuring sensors should be installed at locations below the actual wind turbine hub. Wind conditions change in shape with air density, and air density is most affected by the variable sterrain and surface type. So the magnitude of wind speed depends on the ground altitude. If wind conditions are measured at a location below the wind turbine hub, the wind speed has to be extrapolated to the hub height. This correction of wind speed according to height is done with the Deacon equation used in the statistical analysis of previously observed data. In this study, the optimal Deacon equation parameter was obtained through the analysis of the correction of the wind speed error with the Deacon equation based on the characteristics of terrain.
A Study on the Solar Radiation Estimation of 16 Areas in Korea Using Cloud Cover
Jo, Dok-Ki ; Kang, Young-Heack ;
Journal of the Korean Solar Energy Society, volume 30, issue 4, 2010, Pages 15~21
Radiation data are the best source of information for estimating average incident radiation. Lacking this or data from nearby locations of similar climate, it is possible to use empirical relation ships to estimate radiation from days of cloudiness. It is necessary to estimate the regression coefficients in order to predict the daily global radiation on a horizontal surface. There fore many different equations have proposed to evaluate them for certain areas. In this work a new correlation has been made to predict the solar radiation for 16 different areas over Korea by estimating the regression coefficients taking into account cloud cover. Particularly, the straight line regression model proposed shows reliable results for estimating the global radiation on a horizontal surface with monthly average deviation of -0.26 to +0.53% and each station annual average deviation of -1.61 to +1.7% from measured values.
Application of Passive Solar Systems for Office Buildings
Park, Jin-Seo ; Suh, Seung-Jik ;
Journal of the Korean Solar Energy Society, volume 30, issue 4, 2010, Pages 22~28
This study analyzed the performance of passive solar system for office building. A unit model of the passive solar system was proposed in order to predict its performance under varying parameters and Seoul weather date. Steady state heat transfer equations were set up using a energy balanced equations and solved using a inverse matrix method. Numerical simulation program to analyze system was developed by using MATLAB. As the results, the passive solar system performance of office building was determined by the insolation and the outdoor air temperature. Also the passive solar system indicate 6.7~16.2% of annual average efficiency. In the comparison with other systems of the conventional wall, mass wall could reduce the heating loads of 7.1% and trombe wall could reduce heating loads of 11.5%. Through this study, performance of passive solar system for office building was verified by numerical method. Consequently, the passive solar system could operate an important role as the alternative for saving energy consumption of office building, and the additional studies should be made through the experimental method for the commercialization.
Case Study on 5kWp Transparent Thin-Film BIPV System
An, Young-Sub ; Kim, Sung-Tae ; Lee, Sung-Jin ; Song, Jong-Hwa ; Hwang, Sang-Kun ; Yoon, Jong-Ho ;
Journal of the Korean Solar Energy Society, volume 30, issue 4, 2010, Pages 29~35
This study has been carried out empirical research on Transparent Thin-film BIPV modules, BIPV modules installed on the exterior of the building are applied a laminated module 1kWp, double-glazing module 3kWp and triple-glazing module 1kWp. Applied to the total capacity of BIPV modules are 5kWp. In this study, design and construction process of BIPV systems is presented. In addition, through monitoring of the BIPV system, the temperature and the power characteristics of each module were analyzed. During the measurement period, the module temperature measurement results, the maximum surface temperature of
triple-glazing BIPV module showed the highest, followed by double-glazing BIPV module
laminated modules, respectively. Power output results, the daily average double-layer modules showed 4.10kWh/day, triple-glazing module 1.57kWh, respectively 1.81kWh laminated modules. In particular, the power efficiency of triple-glazing BIPV module was lower than the power efficiency of the laminated BIPV module. This phenomenon is considered to be affected by the module temperature. In the future, BIPV modules in this study the relationship between module temperature and power characteristics plans to identify.
Prediction on heat and mass transfer coefficients in a packed layer of a regenerator with a solar desiccant cooling system
Eflita, Yohana ; Choi, Kwang-Hwan ;
Journal of the Korean Solar Energy Society, volume 30, issue 4, 2010, Pages 36~42
A Study on optimal design for installion of 500kWp PV system testing ground
Kim, Eui-Hwan ; Jang, Ju-Yeon ; Lim, Hee-Chun ;
Journal of the Korean Solar Energy Society, volume 30, issue 4, 2010, Pages 43~48
The performance of photovoltaic systems could be affected by various factors including installing conditions of modules, and their own efficiencies of solar cells and inverters. The installing conditions of a photovoltaic system including array types, tilting angles, azimuth, locations, quantities of sunshine, optimum angles of inclination and separated distance are analyzed using the SolarPro & Minitep SW simulation program, inorder to set up the installing conditions for improving system performance. The result from the simulation of the 500kWp PV system of Kochang with optimal installing conditions compared with normal conditions shows that the capacity factor has been increased from 11.02% to 12.06%.
A Study on the Estimation of Heating Energy and CO2 Reduction depending on a Indoor Set Temperature and Clo value
Lee, Chul-Sung ; Yoon, Jong-Ho ;
Journal of the Korean Solar Energy Society, volume 30, issue 4, 2010, Pages 49~54
Most energy using in building part is mainly consumed for heating and cooling to meet occupancy's comfort temperature. Generally, heating energy consumption show high value than cooling energy in Korea because of high temperature difference in winter season as compared with summer in apartment building. The efforts to develope mechanical performance have been studied to reduce energy consumption in building energy field until now. However, the energy consumption in building is impacted by not only system performance but also PMV particularly at temperature and Clo value. This means that energy consumption can be changed by occupancy's comfort setting temperature in apartment building. This study investigated the passibility of overheating in apartment building by occupant' slow Clo and its setting temperature from preceding research and then the heating energy consumption by setting temperature was calculated with ESP-r. The effects of heating energy and
reduction are also evaluated quantitatively with Clo value. The results showed that keeping ISO-7730 standards can reduce heating energy up to 21% in compared with option 2; also, wearing underclothes with ISO-7730 standard can considerably reduce heating energy consumption up to 50%. As compared with option 2, the reduction of
emission for option 3 showed 0.63TCO2 of kerosene, 0.49TCO2 of LNG and 1.09TCO2 of electricity. The option 4 can be reduced by 1.48TCO2 of kerosene, 1.16TCO2 of LNG and 2.57TCO2 of electricity respectively.
A Study on Analysis of Energy Consumption of a High School Facilities in Korea
Yoon, Jong-Ho ; Shin, U-Cheul ; Cho, Jin-Il ; Kim, Hyo-Jung ; Lee, Chul-Sung ;
Journal of the Korean Solar Energy Society, volume 30, issue 4, 2010, Pages 55~62
The purpose of this study is to present various analysis result of energy consumption that is a statistical analysis of high school facilities in Korea for setting the goal of energy saving. This study enforced analysis after it provided used energy consumption for the year 2008 and general in formation from 2202 high school facilities in 16 cities in South Korea by the relevant agency. Consequently, it represents that the average energy consumption of electric power was 428.7MWh(65.7%), gas consumption for heating was 129.5MWh(19.8%), oil consumption was 84.6MWh(13.0%), district energy was 10.0MWh(1.5%) in nation after changing as unit 'kWh' only for comparison with every energy source. This result describes that consumption of electric power was large greatly and it reflects the expectation that it will climb the demand regarding this energy in the future. In additionally, it analyzed average energy consumption with
by the unit area of air-conditioning and the district which has large energy consumption was Gyeonggi-do with
. Furthermore, it described the average energy consumption of
by the unit area of floor area and the average energy consumption of a student analyzed with 1157.0kWh.
Architectural Design Process by the Changes of Sustainable Design Guidelines of Public Project
Tae, Yeong-Ran ;
Journal of the Korean Solar Energy Society, volume 30, issue 4, 2010, Pages 63~70
This study introduce a architectural design process by the changes of sustainable design guidelines in public project. First of all, this study examines existing integrated design process studies performed by Rhee & U.B.C. Also, this study examines sustainable guidelines which demanded by public building projects. Then, this study introduces sustainable design process using existing sustainable design process, and shows that how to operate and proceed integrated design to satisfy the sustainable guidelines in practice. The results of this study are as follows. (1) Since 2007, sustainable design guidelines of bidding projects have been highlighted. (2) In public buildings, energy saving is very important issue. Especially energy certification demands 1st degree(under
). (3) Inp ractice, integrated design team performed sustainable design using the sustainable design process to improve sustainable in public buildings.
Analysis of Effective Soil Thermal Conductivities and Borehole Thermal Resistances with a Line Source Method
Lee, Se-Kyoun ; Woo, Joung-Son ; Ro, Jeong-Geun ;
Journal of the Korean Solar Energy Society, volume 30, issue 4, 2010, Pages 71~78
Investigation of the effective soil thermal conductivity(k) is the first step in designing the ground loop heat exchanger(borehole) of a geothermal heat pump system. The line source method is required by New and Renewable Energy Center of Korea Energy Management Corporation in analyzing data obtained from thermal response tests. Another important factor in designing the ground loop heat exchanger is the borehole thermal resistance(
). There are two methods to evaluate
: one is to use a line source method, and the other is to use a shape factor of the borehole. In this study, we demonstrated that the line source method produces better results than the shape factor method in evaluating
. This is because the borehole thermal resistance evaluated with the line source method characteristically reduces the temperature differences between an actual and a theoretical thermal behaviors of the borehole. Evaluation of
requires soil volumetric heat capacity. However, the effect of the soil volumetric heat capacity on the borehole thermal resistance is very small. Therefore, it is possible to use a generally accepted average value of soil volumetric heat capacity(
) in the analysis. In this work, it is also shown that an acceptable range of the initial ignoring time should be in the range of 8~16hrs. Thus, a mean value of 12 hrs is recommended.
Uncertainty Analysis on Wind Speed Profile Measurements of LIDAR by Applying SODAR Measurements as a Virtual True Value
Kim, Hyun-Goo ; Choi, Ji-Hwi ;
Journal of the Korean Solar Energy Society, volume 30, issue 4, 2010, Pages 79~85
The uncertainty in WindCube LIDAR measurements, which are specific to wind profiling at less than 200m above ground levelin wind resource assessments, was analyzed focusing on the error caused by its volume sampling principle. A two-month SODAR measurement campaign conducted in an urban environment was adopted as the reference wind profile assuming that various atmospheric boundary layer shapes had been captured. The measurement error of LIDAR at a height z was defined as the difference in the wind speeds between the SODAR reference data, which was assumed to be a virtually true value, and the numerically averaged wind speed for a sampling volume height interval of
. The pattern of uncertainty in the measurement was found to have a maximum in the lower part of the atmospheric boundary layer and decreased with increasing height. It was also found that the relative standard deviations of the wind speed error ratios were 6.98, 2.70 and 1.12% at the heights of 50, 100 and 150m above ground level, respectively.
Design Parameters of Small Hydro Power Sites for River Systems(I)
Park, Wan-Soon ; Lee, Chul-Hyung ;
Journal of the Korean Solar Energy Society, volume 30, issue 4, 2010, Pages 86~91
The characteristics of hydrologic design parameters for small hydro power(SHP) sites located in four major river systems have been studied. The model, which can predict flow duration characteristic of stream, was developed to analyze the variation of inflow. And another model to predict hydrologic performance for SHP plants is established. The results from hydrologic performance analysis for SHP sites located on five major river systems based on the models developed in this study show that the specific design flowrate and specific output of SHP site have large difference between the river systems. The load factor, however, have small difference compared with specific design flowrate and specific output for all river systems. Also, it was found that the models developed in this study can be used to predict the primary design specifications of SSHP plants effectively.
An Estimation on Indoor Thermal Environment by Pressurized Plenum Under Floor Air Conditioning System in Heating
Choi, Eun-Hun ; Lee, Yong-Ho ; Kwon, Young-Cheol ; Hwang, Jung-Ha ;
Journal of the Korean Solar Energy Society, volume 30, issue 4, 2010, Pages 92~99
The purpose of this study is to apply pressurized plenum under floor air conditioning system to office areas to understand characteristics of indoor thermal environment based on forms of diffusers. For doing this, the author conducted experiment of module measurement, and based on the results, analyzed indoor temperature distribution and velocity distribution based on direction of diffusion by using Computational Fluid Dynamics(CFD), and estimated the Predicted Mean Vote(PMV) of residents based on forms of diffusers to present the optimal air conditioning of the pressurized plenum under floor air conditioning system in heating. The results of this study are as follows. First, as for forms of diffusers, distributed diffusers rather than conical and grill diffusers were favorable in maintaining
, the established temperature in heating, were active in velocity flowing, and were wide in a radius of diffusion. Second, as for position of pressurizing, the difference between upper and lower temperature was wider in center, lateral, and dispersed pressurizing (in order). As for velocity distribution, the velocity was more increased in lateral, center, and dispersed pressurizing(in order), indicating that dispersed pressurizing maintained uniform thermal environment. Third, as for diffusion direction, mixed direction showed less difference between upper and lower temperature and the difference in velocity between center and lateral part was 0.01m/1, indicating that it maintained uniform thermal environment. Fourth, as for the PMV of residents based on the forms of diffusers, the dispersed type showed(+) values above (0) when applied variably based on the position of diffuser, presenting thermal feeling of "being comfortable" to residents.