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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 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 operating method for Photovoltaic system through the SOC measurement of batteies
Song, Jung-Yong ; Seo, Yu-Jin ; Kwon, Oh-Sang ; Jeoung, Kwan-Chul ; Huh, Chang-Su ;
Journal of the Korean Solar Energy Society, volume 24, issue 2, 2004, Pages 1~7
In this paper, the new improved method for photovoltaic system was studied available for a lighting load by measuring the state of charge of lead-acid batteries. Photovoltaic systems has been evaluated as one of the most new and renewable energy and especially, the Stand-Alone Photovoltaic system has been used to a street light, a road sign light, an air caution light, an emergency call. Many Stand-Alone PV system are installed by a group. Although the pre-installation cost of PV system is high and it has not been operated due to the absence of optimal management standards. In this paper, it is proposed a new operating method by the measurement of lead-acid battery's SOC with a Ah balancing.
A Study on Performance Analysis of 3kW Grid-Connected PV Systems
So, Jung-Hun ; Choi, Ju-Yeop ; Yu, Gwon-Jong ; Jung, Young-Seok ; Choi, Jae-Ho ;
Journal of the Korean Solar Energy Society, volume 24, issue 2, 2004, Pages 9~15
3kW grid connected PV(photovoltaic) systems have been constructed for evaluating and analyzing performance of PV system at FDTC(field demonstration test center) in Korea, PV systems installed in FDTC have been operating and monitored since November 2002. As climatic and irradiation conditions have been varied through long-term field test, data acquisition system has been constructed for measuring performance of PV system to observe the overall effect of environmental conditions on their operation characteristics. The performance of PV systems has been evaluated and analyzed for component perspective(PV array and power conditioning system) and global perspective(system efficiency, capacity factor, and electrical power energy) by field test. By the results, it is very important to develop optimal design technology of grid connected PV system.
Analyses of the Impact of Atmospheric Conditions to Daylight Illuminance in a Small Space
Kim, Soo-Young ;
Journal of the Korean Solar Energy Society, volume 24, issue 2, 2004, Pages 17~23
Daylight illuminance levels in a small space were calculated using the Superlite program under limited conditions of the turbidity and thickness of condensible water of atmosphere. Three sky conditions(clear sky with direct sun, clear sky with no direct sun, overcast sky with no direct sun) were used. The atmospheric conditions significantly impacted the illuminance levels under especially a clear sky with direct sun. The overcast sky with no direct sun provided no difference for the illuminance levels in the space. As the calculation points moved away from a window, reflected illuminance levels gradually increased but direct illuminance levels significantly decreased.
A Study of Solar heat removal Impact with Air-Vent Wall
Kim, Sang-Jin ; Kum, Jong-Soo ; Choi, Kwang-Hwan ; Shin, Byong-Hwan ; Chung, Yong-Hyun ;
Journal of the Korean Solar Energy Society, volume 24, issue 2, 2004, Pages 25~31
Ventilation through air vent system in a building envelope is expected to be an effective measure to release solar radiation. An external surface of a wall absorbs solar radiation and transfers it to the air in the cavity. The warmed air gets buoyant force. So when openings are provided at the top and bottom of the cavity, the warmed air is released through the top opening and cooler outside air replaces the space in the cavity. This reduces the further heat transmission into the built environment. This natural ventilation effect seems to be steady and strong. So because of the cavity and the openings, the cooling load reduction by natural ventilation is believed to be considerable.
A Study on the optimal length of air cavity for Solar heat removal with Air-Vent System
Kim, Sang-Jin ; Kum, Jong-Soo ; Choi, Kwang-Hwan ; Shin, Byong-Hwan ; Chung, Yong-Hyun ;
Journal of the Korean Solar Energy Society, volume 24, issue 2, 2004, Pages 33~38
Outside wall systems we lost much energy from the dew of thermal bridge and unsuitable adiabatic construction. The air vent wall system can make reduce cooling loads from the outside wall in summer. The basic concept is connected with buoyant force by the difference of density. An external surface of a wall absorbs solar radiation, and transfers it to the air in the cavity. The warmed air gets buoyant force. So the warmed air is released through the top opening and cooler outside air replaces the space in the cavity. So because of the cavity and the openings, the cooling load reduction by natural ventilation is believed to be considerable. The purpose of this study is finding optimal length of air cavity by numerical analyses.
Development and Performance Evaluation of a Sloped Lightshelf Daylighting System
Kim, Jeong-Tai ; Kim, Ki-Cheol ; Kim, Gon ;
Journal of the Korean Solar Energy Society, volume 24, issue 2, 2004, Pages 39~50
One of the challenge for successful daylighting design might be to capture sunlighting that varies in both intensity and position and to deliver the luminous flux into the inner space as deep as possible. Conventional glazing apertures allow daylight in the outer 3.5m of a perimeter spaces. More advanced daylighting technologies can extend this daylighting depth by reflecting sunlight further from the windows within a deep floor area. For this purpose, this study developed light shelves based on performance evaluation with a mock-up model that constructed recently and measured under real sky condition. All these daylighting devices have a customized geometry developed from the solar path at a given latitude and utilize unique reflecting finishing to maximize the amount of redirection and diffusion of the daylight. This paper tells that the best daylighting penetration typically can be expected from using light-colored sloped external shelves.
A Study on the Validation of Heliodon for Daylighting Performance Evaluation
Kim, Jeong-Tai ; Lee, Ji-Hyun ; Kim, Gon ;
Journal of the Korean Solar Energy Society, volume 24, issue 2, 2004, Pages 51~62
Architects may evaluate building models to see how a building will shadow itself and its neighbors at various times. A heliodon, a tilt-table which is a machine that imitates the rotation and orbit of the Earth, helps architects wanting to analyze patterns of shadow patch, passive solar heating options, site solar panels, or control solar heat gain. The heliodon swivels in three directions for setting latitude, season, and time of day. Using the device, an architect first clamps a model to the tabletop, then turns the table to the coordinates of interest. Usually, the winter and summer solstices receive strong attention, for they represent extreme cases, A more recent installation at a university adds to its heliodon a set of lamps to recreate the illumination level and more accurate patterns of shadow patch. The table holds the building model at various angles to a spotlight, which mounts in the pole. The set of scale model measurement describes the validity of various electric lamps as an artificial sun to approximate the sun's parallel rays, helping designers to distinguish between illuminated areas in and around a building and those regions falling in the shadows.
Thermal Performance Evaluation of Earth-Applied Trombe Wall by Simulation
Noh, J.H. ; Kim, J.T. ;
Journal of the Korean Solar Energy Society, volume 24, issue 2, 2004, Pages 63~71
Energy and environmental concerns accelerate the interest in passive solar heating in buildings, which utilizes solar energy through natural heat transfer. Moreover concerns about environmentally friendly materials were also increased. This study aims to evaluate the thermal performance of a Trombe wall built with earth. The thermal performance of the Trombe walls was analysed with results from computer simulations with TRNSYS 15. The thermal performance of the three types of Trombe wall was compared.: concrete. rammed earth. adobe. It was found that Trombe wall with the thermal storage wall of earth performed better than that of concrete. Rammed earth and adobe Trombe walls gained 4.7% and 12.8% more solar energy. respectively. than the concrete Trombe wall. In earth-applied Trombe walls. the energy gain by natural convection released from the airspace was about 75% of the total solar gains. that took 15% more than concrete Trombe wall. Rammed earth and adobe Trombe walls seem to be more suitable for buildings that use mostly in daytime. such as school, office and so on.
An Experimental Study on the Performance of a Direct Contact Heat Exchanger(DCHX) for Solar Application
Hyun, Young-Jin ; Hyun, June-Ho ; Chun, Won-Gee ; Kang, Yong-Heack ;
Journal of the Korean Solar Energy Society, volume 24, issue 2, 2004, Pages 73~81
A Detailed Survey on the Solar Availability for the Construction of Photovoltaic Power Generation Sites
Jo, Dok-Ki ; Kang, Young-Heack ; Lee, Euy-Joon ; Auh, Chung-Moo ;
Journal of the Korean Solar Energy Society, volume 24, issue 2, 2004, Pages 83~88
Since the solar radiation is the main input for sizing any solar photovoltaic system, it will be necessary to understand and evaluate the insolation data. The Korea Institute of Energy Research(KIER) has begun collecting horizontal global insolation data since May, 1982 at 16 different locations. Because of a poor reliability of existing data, KIER's new data will be extensively used by solar photovoltaic system users as well as by research institutes From the results, we can conclude that 1) The yearly averaged horizontal global insolation of Korea was turned out
in the periods of
. 2) Horizontal global insolation of spring and summer was respectively 24 % and 21 % higher than the yearly average value, and that of fall and winter was respectively 12 % and 34 % lower than the yearly average value.
The Realization of MPPT Controller Using Fuzzy Controller for Photovoltaic System
Cho, Geum-Bae ; Choi, Yeon-Ok ; Baek, Hyung-Lae ;
Journal of the Korean Solar Energy Society, volume 24, issue 2, 2004, Pages 89~96
PV system is easy to operate and maintain than the other power generating system since it generally contains no moving parts, operates silently and requires very little maintenance. A solar cell generates DC power from sunlight whose power is different at any instance according to condition of irradiation and temperature variables. In order to improve the system utility factor and efficiency of energy conversion, it is desirable to operate the PV system at maximum power point of solar cell under different condition This paper describes the experimental results of the PV system contain solar modules and a DC-DC converter(boost type chopper) using fuzzy controller. The experimental results show that the PV system always operates at maximum power point of solar cells having stabilized output voltage waveform with relatively small ripple component.