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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 28, Issue 6 - Dec 2008
Volume 28, Issue 5 - Oct 2008
Volume 28, Issue 4 - Aug 2008
Volume 28, Issue 3 - Jun 2008
Volume 28, Issue 2 - Apr 2008
Volume 28, Issue 1 - Feb 2008
Selecting the target year
A Study of Geothermal Power Production with Flashed Steam System
Lee, Se-Kyoun ; Woo, Joung-Son ;
Journal of the Korean Solar Energy Society, volume 28, issue 5, 2008, Pages 1~7
Flashed steam system is one of the important geothermal power production methods. In this paper, optimum operations and performances of single and double flash systems are presented. It is shown that double flash system can produce about 26.5% more power than single flash system. Temperature of geothermal water(
) is the most important parameter in the geothermal system. Optimum single and double flash temperatures and net power produced with these optimum conditions are expressed as a function of
in this study. Thus net power output from geothermal resources can be estimated with the results of this work. Condenser Temperature(
) is also important and the net power production can be shown as a function of (
. Volume flow rate per unit power is also to be considered as the condenser temperature decreases.
Analysis of Optical Characteristics of Transparent Glasses for PV and Glass-Glass Module Application
Kim, Kyung-Soo ; Kang, Gi-Hwan ; Yu, Gwon-Jong ;
Journal of the Korean Solar Energy Society, volume 28, issue 5, 2008, Pages 8~13
In this study, we analyze the electrical optical characteristics of transparent glass for photovoltaic and glass-glass module application. The elemental facts from raw glass to laminated glass with solar cells are analyzed using UV spectrophotometer and spectroradiometer. From the data of transmittance and reflectance, the optimum PV module processing condition and selection of material for fabrication should be considered deeply for obtaining high module efficiency. Also we introduce two glasses which has 2%
4% higher transmittance using coating technology with anti-reflection material. From this experiment, we try to give some basic information for PV module manufacturing industry. The detail description is specified as the following paper.
A Study on the Reduction effect of Peak Cooling Load on the Sunshade effect of BIPV System
Lee, Chung-Sik ; Lee, Eung-Jik ; Lee, Chul-Goo ;
Journal of the Korean Solar Energy Society, volume 28, issue 5, 2008, Pages 14~20
As the number of buildings that use the transparent permeation materials as the outer wall is on the increase, the coming amount of the light rays is a lot, and thus the increase in the cooling load and the radiant heat of high temperature may cause the residents to discomfort. In order to reduce such influences, this paper analyzed the installation effects of the sunshade BIPV. The inner temperature of the room installed the sunshade BIPV or otherwise was measured, and compared and analyzed the effects of reducing the cooling load by the incoming light rays. The sample space of the third floor of S university installed the sunshade BIPV has two rooms on the same conditions, and for five sunny days selected in August, the researcher measured the air temperature and the temperature of the fittings with closing the windows to minimize the movement of air without operating the coolers. The maximum cooling load measured by the incoming light rays in the room where the sunshade BIPV was not installed was examined as 459.13kcal/h. It can be understood as the effect of reducing the cooling load according to the incoming rays of the room with sunshade BIPV. Even though the effect of cooling load reduction is not so great in a room, the total reduction in cooling room for the 32 rooms installed the sunshade BIPV was estimated to be 40442.27kcal/day, which will be able to bring the maximum reduction effect of 17.1kW in energy and reduce the investment cost owing to the reduction in cooling load when initially designing the building.
The Development of the Climatic Design Tool for Energy Efficient Building Design
Baek, Nam-Choon ; Shin, U-Chul ; Lee, Jin-Kook ; Yoon, Eung-Sang ; Yoon, Suk-Man ;
Journal of the Korean Solar Energy Society, volume 28, issue 5, 2008, Pages 21~27
In this study, the design of the solar heating system for district heating as well as it's operating characteristics and the performance analysis was carried out. This solar district heating system was composed of two different types of solar collector circuit, flat plate and vacuum tube solar collector, in a system. This system supply constant temperature of hot water without solar buffer tank. For this, the proportional(variable flow rate) control was used. The experimental facility for this study was used the Bundang district solar heating system which was installed in the end of 2006. The operating characteristics and behaviour of each collector circuits are investigated especially for the system design and control. The yearly solar thermal efficiency is 47.5% on the basis of aperture area and 39.8% on the basis of gross area of collector. As a result this solar heating system without solar buffer tank and with proportional controller was testified a very effective and simplified system for district heating. It varied especially depend on the weather condition like as solar radiation and ambient temperature.
Thermal Performance Evaluation of Movable Insulation System in Apartments
Yoon, Jong-Ho ; Kim, Byoung-Soo ;
Journal of the Korean Solar Energy Society, volume 28, issue 5, 2008, Pages 28~35
The aim of this study was to analysis the Heating/cooling performance of movable insulation system built in apartments. The process of this study is as follows: 1) Test-cells of movable insulation are designed through the investigation of previous paper and work. The type of the movable insulation used in test-cell is low emissivity(5%) insulation, measured for heating season and the thermal effects are analyzed. 2) The simulation program(Design Builder) was used in energy performance analysis. the reference model of simulation was made up to analysis energy performance on movable insulation system. 3) Selected reference model(Floors:15, Area of Unit:115.5
) for heating/cooling energy analysis, Energy performance simulation with various variants, such as slate angle of movable insulation(5
) and position of movable insulation. Consequently, When movable insulation system is equipped with balcony window of Apartment, Annual heating energy of reference model was cut down at the average of 5.4kWh/
or 4.6% of heating/cooling energy.
Analysis on Dimming Control Effect by Algorithm Variation for Direct/Indirect Lighting in a Small Office
Kim, Soo-Young ;
Journal of the Korean Solar Energy Society, volume 28, issue 5, 2008, Pages 36~48
This study examines the influence of control algorithms on dimming performance to determine appropriate control setting when direct/indirect lighting is controlled by a daylight dimming system. Computer simulation were performed for a small office with double skin envelope under various daylight conditions. A retractable fabric shading and Venetian blind were applied for internal and external envelopes under three CIE standard sky conditions. Unshielded and partially-shielded photosensors were used, and three control algorithms were applied for the sensors. In general, dimming level was too excessive due to the direct impact of light from lighting fixture to the photosensor. Providing insufficient lighting output, the unshielded photosensor completely failed to secure required illuminance under any daylight condition. When a partially-shielded photosensor was applied under clear sky, three setting points functioned effectively. Less sensitivity for the partially-shielded photosensor was effective to control the dimming system optimally with reasonable energy saving. However, the daylight dimming control system for direct/indirect lighting does not appear to be energy effective when photosensors without enough shielded area is installed on ceiling where light from fixtures reaches directly.
Nocturnal Radiant Cooling during the Winter by the Plate Viewing the Sky
Byun, Ki-Hong ;
Journal of the Korean Solar Energy Society, volume 28, issue 5, 2008, Pages 49~55
The radiant cooling(RC) effects are studied during the winter night. The plate was viewing the nighttime sky. The data were collected at the rooftop of the Engineering building at the Dongguk University in Seoul, Korea. As observed during the summer night, the plate temperature was lower than ambient temperature under the RC favorable conditions. The parameters under study are the wind velocity, cloud index, and visibility for given system size and surface condition. The results follow the same tendency with these parameters as observed from the previous study for the summer night. As long as the wind velocity is less than around 2 m/s, the radiant cooling was observed with the system under study. In some cases, the radiant cooling temperature differences (RCTD) are higher than those for the summer night. The larger the RCTD as the wind velocity decreases and as the sky becomes clear.
Development & Performance Evaluation of Ground Heat Exchanger Utilizing PHC Pile Foundation of Building
Yu, Hyung-Kyu ;
Journal of the Korean Solar Energy Society, volume 28, issue 5, 2008, Pages 56~64
The objective of this study is to develope ground heat exchanger using PHC file used to building foundation, and it's element technology. So we construct PHC ground heat exchanger in the apartment house's PHC foundation and evaluate it's performance. First, we study PHC file type, heat exchanger pipe, grouting materials, and present apartment house's foundation condition for PHC ground heat exchanger and design it's proto type. Second according to grouting materials, we estimate construction convenience, and it's performance. Construction convenience side, PB 22 A pipe and sand grouting with moisture was good for PHC ground heat exchanger elements. Experiment result is very superior. Thermal conductivity B, C type(sand, gravel) was respectively 32.4 W/m
, 36.5 W/m
, D(concrete) Type 27.8 W/m
, E(bentonite) Type 19.6 W/m
. Thermal interference for 4 day experiment period in 3.8 m was very small. So PHC file is good for using ground heat exchanger.
A Study on the Measurement of Airtightness Performance of Detached Houses in Chung-cheong area
Yoon, Jong-Ho ; Park, Jae-Wan ; Lee, Kwang-Sung ; Baek, Nam-Choon ; Shin, U-Cheul ;
Journal of the Korean Solar Energy Society, volume 28, issue 5, 2008, Pages 65~71
The purpose of this study is to investigate an airtightness of typical Korean detached houses with field measurements. Air leakage testings by means of blower door test in accordance with ASTM E79-8 were measured in 22 detached dwellings in Daejeon and Geumsan. The results showed that detached dwellings have an average airtightness with ACH50/20 (air chang per hour at a pressure difference of 50 Pa between inside outside) of 0.82
which is a higher range than for typical apartments and leakage class G by normalized leakage area of ASHRAE.
The practical operating evaluation of the grid connected PV power system
Kim, Eui-Hwan ; Ahn, Kyo-Sang ; Lim, Hee-Chun ;
Journal of the Korean Solar Energy Society, volume 28, issue 5, 2008, Pages 72~77
The purpose of this paper is to explain the real characteristics of generation system of large scale power system of high voltage the grid connected PV power system for electricity industry. Main system is made up PCS in the class 150kVA. and we studied commercial operation in Korea-Western Power Company,(Tae-An headquarter) with the capacity of module is 122.5
. On the average, power plant utilities' utilization is 12.71 percent and consumption rate is 6.66 percent. We operated normally since 25th, August 2005 without any other problems.
Performance Characteristics of a Heat Pipe Having Water-Ethanol Mixture as Working Fluid for Evacuated Solar Collectors
Jung, Eui-Guk ; Boo, Joon-Hong ; Kwak, Hee-Youl ;
Journal of the Korean Solar Energy Society, volume 28, issue 5, 2008, Pages 78~84
Heat pipes are considered to be promising candidates to enhance the heat transport capability of evacuated solar collectors in a wide temperature range. The working fluid must be selected properly considering various operating conditions of heat pipes for medium-high temperature range to avoid dry-out, local overheating, and frozen failure. The advantage of using binary mixture as heat pipe working fluid is that it can extend operating temperature range of the system as it can overcome operating temperature limit of a single fluid. Various operating temperature ranges were imposed in the experiments to simulate the actual operation of solar collectors using water-ethanol binary mixture. Tests were conducted for the coolant temperature range of -10
, and mixing ratio range was from 0 to 1 based on mass fraction.
Boost Converter Modelling of Photovoltaic Conditioning System Considering Input Capacitor
Choi, Ju-Yeop ; Lee, Ki-Ok ; Choy, Ick ; Song, Seung-Ho ; Yu, Gwon-Jong ;
Journal of the Korean Solar Energy Society, volume 28, issue 5, 2008, Pages 85~95
Photovoltaic conditioning systems normally use a maximum power point tracking (MPPT) technique to deliver the highest possible power to the load continuously when variations occur in the insolation and temperature. A unique method of tracking the maximum power points (MPPs) and forcing the boost converter system to operate close to these points is presented through deriving small-signal model and transfer function of boost converter considering input capacitor. This paper aims at modeling boost converter including fairly large equivalent series resistance(ESR) of input reservoir capacitor by state-space-averaging method and PWM switch model. In the future, properly designed controller for compensation will be constructed in 3kw real system for maximum photovoltaic power tracking control.