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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 24, Issue 4 - Dec 2004
Volume 24, Issue 3 - Sep 2004
Volume 24, Issue 2 - Jun 2004
Volume 24, Issue 1 - Mar 2004
Selecting the target year
A study on the design and performance of a stand-alone photovoltaic lighting system
Kwon, Oh-Sang ; Seo, Yu-Jin ; Huh, Chang-Su ;
Journal of the Korean Solar Energy Society, volume 24, issue 4, 2004, Pages 1~10
In view of global environmental problems and resource exhaustion, we must develop new energy resources that are abundant and provide substitutes for fossil fuels. Renewable energies, such as solar, are ideal because they are clean, inexhaustible, and available everywhere in the world. Photovoltaic(PV) system, in general, are operated as a stand-alone, grid-tied, or hybrid system. Many of the stand-alone PV systems are installed. Although the pre-installation cost of PV system is high, it poorly has been operated due to the absence of optimal management standards. Therefore a study on the performance of PV system is important for the system design and maintenance. In this paper a photovoltaic lighting system was resigned according to load consumption. Then a PV lighting system which used electrodeless lamp as a load was installed. In order to investigate the system operating characteristics we've added a monitoring system to the PV lighting system. The monitoring system using the LabVIEW program regularly checks the operation of the PV lighting system and records the system data. According to the system data, the stability and availability of the PV lighting system were evaluated.
Flux Density Distribution of the Dish Solar Concentrator (KIERDISH II)
Kang, Myeong-Cheol ; Kang, Yong-Heack ; Yoo, Seong-Yeon ;
Journal of the Korean Solar Energy Society, volume 24, issue 4, 2004, Pages 11~18
A solar concentrator, named KIERDISH II, was built at KIER in order to investigate the feasibility of high temperature solar energy application system. The constructed concentrator is a dish type solar concentrator with a focal length of 4.68m and a diameter of 7.9m. To successfully operate KIERDISH II, optimal design of the absorber is very important and flux density distribution has to be known. The focal flux density distribution on the receiver was measured. We have observed the shape and size of flux images and evaluated percent power within radius. Flux density distribution is usually measured by a CCD(charge coupled device) camera and a radiometer. In this paper we present a flux mapping method to estimate the characteristic features of the flux density distribution in the focal region of solar concentrator. The minimum radius of receiver is found to be 0.15m and approximately 90% of the incident radiation is intercepted by receiver aperture.
Comparison of the Thermal Performance with Stationary and Tracking Evacuated CPC Collectors
Yun, Seong-Eun ; Kim, Yong ; Seo, Tae-Beom ;
Journal of the Korean Solar Energy Society, volume 24, issue 4, 2004, Pages 19~25
A numerical study is performed to investigate the effect of sun tracking on the thermal performance of the evacuated compound parabolic concentrator (CPC) collectors. The evacuated CPC collectors consist of a two-layered glass tube, a copper tube and a reflector. The collector has a copper tube as an absorber and a reflector inside a glass tube. The water is used as a working fluid. The length and the diameter of the glass tube are 1,700mm and 70mm, respectively. The length and the diameter of the copper tube are 1,700mm and 25.4mm, respectively. Ray tracing analysis is carried out in order to compare absorbed heat fluxes on the absorber surface of the stationary and tracking collectors. The collected energy is calculated and compared with that on a fixed surface tilted at
on the ground and facing south. The results indicate that the collected solar energy of the sun tracking system is significantly larger than that of a stationary collector. The sun tracking evacuated CPC collectors show a better performance with an increase in the thermal efficiency of up to 14% compared with an identical stationary collector.
Load Measurements of 100 kW Wind Turbine
Bae, Jae-Sung ; Kim, Sung-One ; Kyong, Nam-Ho ;
Journal of the Korean Solar Energy Society, volume 24, issue 4, 2004, Pages 27~33
Mechanical load measurements on blade and tower of Vestas 100 kW wind turbine has been reformed in Wollyong test site, Jeju island. The experimental procedure for the measurement of wind turbine loads, such as edgewise(lead-lag) bending moment, flapwise bending moment, and tower base bending moment, has been established. The test facilities consisting of strain-gauges, telemetry and T-Mon system are installed in the wind turbine. Strain gauges are on-site calibrated against load cell prior to monitoring the wind turbine loads. Using the test setup, the loads on the components are being measured and analysed for various external conditions of the wind turbine. A set of results for near rated wind speed has been presented in this paper.
Prediction of Contrast and Lighting Energy Saivings in a Small Office Space according to Daylight Conditions
Kim, Soo-Young ;
Journal of the Korean Solar Energy Society, volume 24, issue 4, 2004, Pages 35~43
Ulluminance and luminous levels in a small office space due to daylight were calculated to analyze the impact of daylight on contrast and lighting energy savings. Computer simulations were performed for four blind conditions under a clear sky condition. The blind conditions significantly impacted the illuminance an4 luminance level. Visual performance scores were calculated according to the transfer function that uses absolute contrast between target and background surface. The blind condition that had 45 tilted angle toward ground provided good contrast and performance scores. Using a control algorithm of an automated daylight dimming control system lighting energy sayings were predicted. For all blind conditions minimum lighting energy was consumed
Analysis of the Irradiated Solar Heat Effect on Indoor Thermal Environment of the ToP Floor Units of Apartment Houses in the Summer - On Condition that All Openings of the Units are Closed -
Choi, Dong-Ho ;
Journal of the Korean Solar Energy Society, volume 24, issue 4, 2004, Pages 45~53
In the summer, the irradiated solar heat gain through the roof has an effect on the thermal environment of the top floor units of apartment houses. This paper investigated the differences of the indoor air temperature and thermal comfort index between the top floor unit and the middle floor unit by measuring them at the sample houses. The purpose of this paper is to provide quantitative data about the irradiated solar heat gain during the summertime through the roof of an apartment house and these data to be the source to reevaluate the appropriate roof insulation efficiency. From this study, we obtained the brief results as follows. Indoor air temperature at the top floor unit is
higher than that of middle floor unit. The evaluation of the indoor thermal comfort index at each sample rooms reveals notable thermal differences between the two units. Top floor units need more cooling load during the summertime compared to middle floor units. Therefore, solutions to reduce solar Heat gain at top floor units to be considered.
A Study on the Development of Life Cycle Cost Analysis Methodology in HVAC system for Decision Maker
Jung, Soon-Sung ;
Journal of the Korean Solar Energy Society, volume 24, issue 4, 2004, Pages 55~63
The purpose of this study is to development of life cycle cost analysis methodology of HVAC system for decision maker. The results of this study are as follows; maintenance/management, equipment construction, planning/design, and demolition/sell phases (1) To develop the cost breakdown structure for LCC in HVAC system, this study apply the method of additional pertinent level, title, CBS number, block number and variable index. (2) LCC analysis order of HVAC system compose four phase. (3) Life cycle costing influence diagram can bring us to make the most efficient decision through a visual graphical diagram that is shown relationship among variables and that decision maker traces easily from life cycle cost analysis situation.
Measurement and Analysis of Heat Island in summer in Gwangju
Park, Seok-Bon ;
Journal of the Korean Solar Energy Society, volume 24, issue 4, 2004, Pages 65~75
This study aims to identify the degree of heat island in summer in Gwangju. For the purpose the city was classified according to use and surface components and temperature of the city for 24 hours was measured. The period of measurement was from August 11 to 13. 2003(two days). As a result of the measurement, the daily standard temperature of the central business areas and downtown areas was about
. That of new residential areas neighboring the downtown was
, and that of the outer residential areas was
. In comparison with the result that temperatures of the Gwangju University playground and the Gwangju Weather Bureau were
respectively, the temperature of the downtown was about
Higher and that of the new residential area in downtown was about
higher. And it was demonstrated that the downtown outer road under Mt. Mudeung is a low-temperature zone. When temperature of the city was measured based on surface components, the daily standard temperature of Gwangju Stream Bok-gae area was the highest,
, followed by
of the downtown stream and
of the greens (city park) and the waterside area.
A study on the efficiency of sloped type Double-skin System for the Curtailment of Heating/Cooling Load
An, Hyung-Jun ; Kim, Young-Tag ; Choi, Chang-Ho ; Lee, Hyn-Woo ;
Journal of the Korean Solar Energy Society, volume 24, issue 4, 2004, Pages 77~87
BIPV or double skin applied to the surface of the building, power and thermal load cannot both be increased. In the case of BIPV, because it is applied to the facade, incident solar energy decreases and efficiency drops off. The system in this paper complements these disadvantages and aims to decrease the heating & cooling load by transforming solar energy to electronic and thermal energy. The research in this paper is about the applicability of the clear PV attached double-skin system. And the PV electronic generation and the factors that affect the heating & cooling load such as the daily radiation, sun shading ratio, heating & cooling load, daylight luminance and glare distributions in the building are simulated.