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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
Editor in Chief :
Volume & Issues
Volume 27, Issue 4 - Dec 2007
Volume 27, Issue 3 - Sep 2007
Volume 27, Issue 2 - Jun 2007
Volume 27, Issue 1 - Mar 2007
Selecting the target year
Study on the Solar Flux on Facade Variation in Apartment Housing
Lee, Duck-Hyung ; Choi, Chang-Ho ;
Journal of the Korean Solar Energy Society, volume 27, issue 2, 2007, Pages 1~9
Recently, the point of view about housing environment in the city has changed from the traditional point of view of the center of housing to the subject of land- utilization-control for interaction of buildings. Right of light is the center of this issue in other words. Also many interests about the beauties of the city have increasing centering around Europe etc. This is to change a city design into the characteristic design from the exiting uniform design. As if reflect this situation, recently we are setting up the night illumination and constructing a building which acted as Land Mark like the Jong-Ro Tower. And Apartment Housing was being built various form deviate from a existing standardized form and skyline. Existing studies about sunshine of Apartment Housing have dealt with just about a standardized Apartment Housing form. So this study analyzed a recently increasing interest for Right of light and change of sunshine environment on Apartment Housing which have a various skyline form.
A Study on the Seasonal Performances Evaluation of the Horizontal-type Geothermal Heat Exchanger Installed in the Foundation Slabs of Complex Building
Hwang, Kwang-Il ; Woo, Sang-Woo ; Kim, Joong-Hun ; Shin, Seung-Ho ; Kim, Yong-Shik ;
Journal of the Korean Solar Energy Society, volume 27, issue 2, 2007, Pages 11~17
This study evaluates the seasonal performances of the horizontal-type geothermal heat exchanger(HGHEX) installed into the foundation slabs of the complex building located at Seoul. The geothermal system is consisted with totally 31,860m long HGHEX, 16 GSHPs (Ground-source Heat Pump) and 8 circulation pumps. This system supplies cooling and heating to the lobby(F1) and the common spaces(BF1). The average heat exchange temperature differences are
in the summer,
in the winter for the F1 and BF1 respectively. From these results, approximately 400Gcal and 180Gcal of geothermal energy are assumed to have been used during the summer and winter seasons respectively. As a conclusion, the geothermal system is reviewed as a effective utility for heating and cooling at the point of seasonal performances.
A Study on Hybrid Heating System with Anti-Superheating Devices
Park, Youn-Cheol ; Ko, Gwang-Soo ; Han, Yu-Ry ;
Journal of the Korean Solar Energy Society, volume 27, issue 2, 2007, Pages 19~27
The previous study was conducted to develop an air source multi heat pump system that could be operated with the solar collector and air source heat exchangers as heat source of the system. There is a winter-sowing problems in air source multi heat pump system when the outdoor temperature goes down under freezing point. The winter-sowing problem was solved by adapting R-22 refrigerant as working fluid in the previous study. However, when the system operated at high temperature, another problems are come out such as overheating of the solar collector outlet which lead to the superheat of the compressor inlet of the heat pump system. The condition could deteriorates a compressor in some case. In this study, we installed the anti-superheating devices on the previously developed system. As results of system performance test, COP of the system with anti-superheating technique is 2.4. It is a little improved COP compare to previous study's 2.23. In the results of multi heat source heating system, during operating solar collector, COP is relatively high between
solar intensity. It is recommended to extend the study on performance optimization with balancing the solar collect and capacity of compressor at higher solar irradiation conditions.
Performance Monitoring Results, Evaluation and Analysis of 50kW Grid-Connected PV System
So, Jung-Hun ; Yu, Byung-Gyu ; Hwang, Hye-MI ; Yu, Gwon-Jong ; Choi, Ju-Yeop ;
Journal of the Korean Solar Energy Society, volume 27, issue 2, 2007, Pages 29~35
Monitoring system is constructed for evaluating and analyzing performance of installed 50kW grid-connected PV system and have been monitored since October 2005. As climatic and irradiation conditions have been varied through long-term operation, there is necessity for evaluating numerical values of PV(Photovoltaic) system performance to observe the overall effect of environmental conditions on their operation characteristics. This paper presents performance monitoring results and analysis on component perspective(PV array and power conditioning system) and global perspective(yield, losses) of PV system for one year monitoring periods.
Active Frequency Drift Positive Feedback Method for Anti-islanding using Digital Phase-Locked-Loop
Lee, Ki-Ok ; Young, Young-Seok ; Choi, Ju-Yeop ; Choy, Ick ; Song, Seung-Ho ; Ko, Moon-Ju ;
Journal of the Korean Solar Energy Society, volume 27, issue 2, 2007, Pages 37~44
As photovoltaic(PV) power generation system becomes more common, it will be necessary to investigate islanding detection method for PV systems. Islanding of PV systems can cause a variety of problems and must be prevented. However, if the real and reactive power of the load and PV system are closely matched, islanding detection by Passive methods becomes difficult. Also, most active methods lose effectiveness when there are several PV systems feeding the same island. The active frequency drift positive feedback method(AFDPF) enables islanding detection by forcing the frequency of the voltage in the island to drift up or down. In this paper the research for the minimum value of chopping fraction gain applied digital phase-locked-loop (DPLL) to AFDPF considering output power quality and islanding prevention performance are performed by simulation and experiment according to IEEE Std 929-2000 islanding test.
A Study on the Analysis of Global Dimming Appearances Using the Solar Radiation Measurement in Korean Major Cities (Focused on Atmospheric Clearness Analysis)
Jo, Dok-Ki ; Kang, Young-Heack ;
Journal of the Korean Solar Energy Society, volume 27, issue 2, 2007, Pages 45~52
Since the atmospheric clearness index is main factor for evaluating global-dimming of atmosphere environment, it is necessary to estimate its characteristics all over the major cities in Korea. We have begun collecting clearness index data since 1982 at 16 different cities and considerable effort has been made for constructing a standard value from measured data at each city. The new clearness data for global-dimming analysis will be extensively used by evaluating atmospheric environment as well as by solar PV application system designer or users. From the results, we can conclude that 1) Yearly mean 61.9% of the atmospheric clearness index was evaluated for clear day all over 2) A significant difference of atmospheric clearness index is observed between 1982-1989 and 1990-1997, 1998-2005 through 16 different cities in Korea.
A Study on the Analysis of Solar Radiation Components for the Installation of Concentrating Photovoltaic System
Jo, Dok-Ki ; Kang, Young-Heack ;
Journal of the Korean Solar Energy Society, volume 27, issue 2, 2007, Pages 53~59
Knowledge of the solar radiation components are essential for modeling many solar photovoltaic systems. This is particularly the case for applications that concentrate the incident energy to attain high photo-dynamic efficiency achievable only at the higher intensities. In order to estimate the performance of concentrating PV systems, it is necessary to know the intensity of the beam radiation, as only this component can be concentrated. The Korea Institute of Energy Research(KIER) has began collecting solar radiation component data since August, 1996. KIER's component data will be extensively used by concentrating PV system users or designers as well as by research institutes.
A Study on the Field Test of the Solar Heating System with Parabolic Solar Collectors Integrated the Roof of a Residential Building
Kim, Yong-Ki ; Lee, Tae-Won ; Yoon, Kwang-Eun ;
Journal of the Korean Solar Energy Society, volume 27, issue 2, 2007, Pages 61~69
The final energy consumption in the building sector in Korea represents almost 20% of the total energy consumption. Besides, Space heating and hot water generation in Korea are based on fossil fuels, with a serious environmental impact. Despite the popularity of simple solar domestic hot water systems, active solar space heating remains, for various reasons, marginal. And thus, the aim of this paper is to demonstrate potentialities of solar assisted space heating systems, both technically and economically. From this study found that the solar heating system with CPC solar collectors integrated the roof of a single-story residential building shares
of the annual heating load.
Heat transfer performance with different fills as volumetric air receivers for concentrated solar radiative energy
Lee, Ju-Han ; Kim, Yong ; Jeon, Yong-Han ; Seo, Tae-Beom ; Kang, Yong-Heack ;
Journal of the Korean Solar Energy Society, volume 27, issue 2, 2007, Pages 71~78
The heat transfer characteristics of solar tower receivers are experimentally investigated with receiver shapes. Generally, these become different according to the shapes and materials of the volumetric air receiver. In order to study these effects, the apparatus adopting laminated mesh and honeycombs as the volumetric air receiver is proposed. The receiver consists of laminated mesh (diameter; 100 mm, thickness; 1 mm), honeycombs (diameter; 100 mm, thickness; 30 mm) inserted into ceramic tube (inside diameter; 100 mm, outside diameter; 120 mm, length: 1000 mm). To apply heat to the receiver, an electric heater is used. To find out the heat transfer characteristics of the laminated mesh, the air temperatures are obtained by installing 3 thermocouples on each layer, dividing ceramic tube into 4 layers. Also, a radiative shield is installed to measure the only air temperature. The data for laminated mesh and honeycomb thickness of 30, 60, 90 mm are obtained. The results show that the temperature of layer 3 is higher than those of layer 2 and layer 1.
Performance Characteristics of In-Line Duct Fan Having Mixed Flow Impellers
Park, Jin-Wook ; Lee, Chul-Hyung ; Park, Wan-Soon ; Huh, Jong-Chul ;
Journal of the Korean Solar Energy Society, volume 27, issue 2, 2007, Pages 79~85
The performance of in-line duct fan depends on the design parameters of impeller and guide vane such as sweep back angle of impeller hub, guide vane angle etc. In this study four kinds of impellers having different sweep back angles,
with 8 guide vanes, and different guide vane angles,
were selected and their performance measured to investigate the effects of design parameters. The results show that both sweep back angle of impeller hub and the guide vane angle have large effect on the efficiency. Especially, it was found that the mixed flow impellers having sweep back angle between
gave good performances for in-line duct fan.
The Assessment of Payback Period for the Photovoltaic System in Residential Building
Kim, Myung-Chul ; Ju, Jai-Wook ; Seo, Gan-Ho ; Lee, Kyung-Hee ; Choi, Jeong-Min ;
Journal of the Korean Solar Energy Society, volume 27, issue 2, 2007, Pages 87~93
The demand for solar electric power systems, namely, photovoltaic system has grown steadily in our country over the last 10 years. However, the main obstacle against using photovoltaic system is the financial viability especially concerned with initial cost. The other factors affecting the economic viability of photovoltaic system are cost of electric energy, amount of electric energy produced by the photovoltaic system, discount rate, energy cost escalation rate, inflation rate, project life, and so on. Therefore, this thesis studies on the effect of various relating factors on economic evaluation of photovoltaic system in residential building by calculating payback period.
Change of Thermal Environment with Urban Expansion
Kim, Sang-Jin ;
Journal of the Korean Solar Energy Society, volume 27, issue 2, 2007, Pages 95~101
The surface changes due to urban expansion and the increase of artificial heat releases have brought significant climate changes such as heat island phenomenon in urban area. Furthermore, these changes also have brought serious problems such as air temperature increase, wind changes, and air pollution in urban area. Comprehensive analytical technologies considering various effects are required to analyse complicated mechanism of climate changes, and review the efficient measures. In this research, the effect of the urban expansion in Tokyo and Bangkok area on urban environment will be discussed. By using CFD, urban development and the mechanism of global warming and wind change are studied in those two cities. As a result of numerical research, the surface changes of city could bring the environmental changes in urban area.
A Study on the Analysis of Energy Consumption Patterns According to the Building Shapes with the Same Volume
Choi, Won-Ki ; Kim, Heon-Joong ; Suh, Seung-Jik ;
Journal of the Korean Solar Energy Society, volume 27, issue 2, 2007, Pages 103~109
This study was focused on the establishment of a fundamental DB(database) that is available in the building design process, so we performed the simulation analysis about the energy consumption on the various same volume buildings. Because energy consumption in building is affected by the exterior surface area, the ratio of long/short length in surface and the adjacent internal surface area etc.. For these purpose, we assumed the unit module and made a constructable 16 model buildings which are composed of the 16 unit modules. Then we analyzed the simulation using the TRNSYS 16 and the Seoul weather data. In results, energy consumption in building is more reduced that in case of the smaller exterior surface area, the lower stories building and the larger adjacent surface area etc.. Further study is to be required the sensitivity analysis on the various weather conditions, building shapes and window area etc..
A Comparative Experimental Study on Thermal Performance of Box-typed Double Skin and Curtain Wall in Cooling Period
Park, Chang-Young ; Lee, Keon-Ho ; Yoon, Yong-Sang ; Choi, Chang-Ho ;
Journal of the Korean Solar Energy Society, volume 27, issue 2, 2007, Pages 111~119
The annual mean temperature of South Korea has risen by
for last 100 years by urbanization and industrialization. Especially, the frequency of unusual hot weather in summer increases for a long time and the frequency of unusual cold weather in winter clearly decreases. In recently, The considerable portion of curtain wall system is appled to building skin in domestic. As related to this, the Korea Institute of Construction Technology devised the box typed double skin facade(It is occasionally called as FDFS : Functional Double Facade System) as an alternative that reflects the distinctive local climate and saves cooling energy. Two mock-ups(
) applied to single skin(curtain wall) and double skin each were monitored under the outdoor condition. Therefore, the characteristics of natural ventilation and cooling energy consumption of each window had been analyzed in real time. The results of this study are summarized as follow, Analysis of the experiment on an air conditioner: the indoor temperature of the chamber with FDFS is lower than that of the chamber with single skin facades by
degrees(C). A temperature variation of about
degrees between the 0.2m and 1.7m height of the mock-up occurs in FDFS, while that of about maximum 7 degrees occurs in single skin facade at noon with abundant intensity of solar accident. Also, 67 percent of energy consumption for air conditioning has been saved.