Go to the main menu
Skip to content
Go to bottom
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 21, Issue 4 - Dec 2001
Volume 21, Issue 3 - Sep 2001
Volume 21, Issue 2 - Jun 2001
Volume 21, Issue 1 - Mar 2001
Selecting the target year
Steam Reforming of Methane for Chemical Heat Storage As a Solar Heat Storage. Part 1. Conversion of Methane
Yang, D.H. ; Chung, C.H. ; Han, G.Y. ; Seo, T.B. ; Kang, Y.H. ;
Journal of the Korean Solar Energy Society, volume 21, issue 3, 2001, Pages 1~8
The chemical heat storage as the one way of utilization for high temperature solar energy was considered. The stram reforming reaction of methane was chosen for endothermic reaction. The reactor was made of stainless steel and the dimension was 6.25 mm I.D. and 30 cm long coiled tube because of the geometry requirement of solar receiver. The methane conversion was increased linearly with reaction temperature and nickel content of catalyst. The methane conversion was 60% at
and 90% at
. The feasibility of steam reforming of methane as the conversion of solar energy to chemical heat storage was confirmed.
Analysis of Thermal Performance in Roof Evaporative Cooling System
Shin, U.C. ;
Journal of the Korean Solar Energy Society, volume 21, issue 3, 2001, Pages 9~18
This paper reports on an theoretical study of heat transfer from evaporative cooling system by the flow of recirculated water over the roof. In this system tile water is distributed at the top of the pitched roof, collected at the bottom by a gutter and recirculated by a pump. To analysis the system, the energy balance equations are developed and solved using a finite difference method. The calculation results show a good agreement with the measured ones obtained from our experiment. Based on the results, it was seen that the roof-evaporative cooling system reduced the heat flux significantly compared with the conventional roof structure even in the hot-humid summer climate of Korea.
A Study on the Analysis of Solar Radiation on Inclined Surfaces
Jo, D.K. ; Chun, I.S. ; Jeon, M.S. ; Kang, Y.H. ; Auh, C.M. ;
Journal of the Korean Solar Energy Society, volume 21, issue 3, 2001, Pages 19~24
The amount of incident solar rays on inclined surfaces with various directions has been widely utilized as important data in installing solar collector, hot water system, and photovoltaic module, and designing solar buildings and house. This is because the performance of the solar energy applied systems is much affected by angle and direction of incident rays. Recognizing those factors mentioned above are of importance, actual experiment has been peformed in this research to obtain the angle of inclination with which the maximum incident rays can be absorbed. The results obtained in this research could be used in designing optimal solar systems.
A Study on the Uncertainty Analysis for Thermopile Pyranometer Calibrations
Jo, D.K. ; Chun, I.S. ; Jeon, M.S. ; Kang, Y.H. ; Auh, C.M. ;
Journal of the Korean Solar Energy Society, volume 21, issue 3, 2001, Pages 25~32
The major purpose of this paper is to develop an uncertainty estimate for the calibration of thermopile instruments used to measure solar radiation parameters. We briefly describe the solar radiation parameters most often measured, instrumentation, reference standards, and calibration techniques. The bulk of the paper describes elemental sources of error and their magnitude. We then apply a standard error analysis methodology to combine these elemental error estimates into a statement of total uncertainty for the instrument calibration factor. Our results allow one to evaluate the accuracy of a radiometric measurement using thermopile instrumentation in the light of the application, such as engineering test evaluation or for validation of theoretical models.
A Numeical Analysis on the Thermal and Fluid Flow in Solar Concentration Absorber with Tilt Angle
Lee, Y.H. ; Bae, C.H. ; Bae, K.Y. ; Jeong, H.M. ; Chung, H.S. ;
Journal of the Korean Solar Energy Society, volume 21, issue 3, 2001, Pages 33~41
This paper showed the a numerical analysis of the thermal and fluid flow in solar concentration absorber with tilt angle, and the purpose of this study is to obtain the optimum tilt angle of the absorber. The boundary conditions of a numerical model were assumed as flows : (1) The heat source is located at the center of absorber (3) The bottom wall is opened and adiabatic. (3) The top, right and left walls are cooled wall. The parameters for the numerical analysis are tilt angles and Rayleigh numbers i.e., tilt angle
103. The velocity vectors and isotherms were dense at wall side and the heat source. The mean Nusselt number had a maximum value at
and showed a low value as the tilt angles were increased. Finally, the decrease rate of mean Nusselt number was appeared small with tilt angle when Rayleigh numbers were increased.
Heat Transfer in a Horizontal Mantle Heat Exchanger for a Thermosyphon-driven Flat Plate Collector
Cho, H.J. ; Seo, T.B. ; Kang, Y.H. ;
Journal of the Korean Solar Energy Society, volume 21, issue 3, 2001, Pages 43~50
A horizontal mantle heat exchanger for a thermosyphon-driven SDHW(solar domestic hot water) was numerically simulated and fluid flow and heat transfer in the annulus of the mantle heat exchanger were quantitatively investigated. The Reynolds number, the location of the inlet, and the gap of the annulus were selected as the important design variables. The effects of the design variables on the heat transfer characteristics were thoroughly studied. Based on the numerical results, a correlation for predicting the heat transfer coefficient was suggested as the conclusion of this study.
Modeling of a Greenhouse Equipped with Latent Heat Storage System
Ro, J.G. ; Song, H.K. ;
Journal of the Korean Solar Energy Society, volume 21, issue 3, 2001, Pages 51~60
A greenhouse equipped with latent heat storage system was built to obtain various thermal properties, such as greenhouse air temperature, soil surface temperature, energy flow in latent heat storage, etc., which could be used in validation of greenhouse numerical model to be developed in this study. This numerical model expressed with Newton-Raphson method was programed by C-language and utilized to simulate greenhouse thermal behavior. Greenhouse air temperature and soil surface temperature predicted by the greenhouse model developed in this study were very close to the measured data obtained through almost 3 years of experiment. Therefore, it is concluded that the greenhouse model developed and verified by measured data could be utilized for simulating various thermal behaviors of greenhouses equipped with latent heat storage system to be used for energy saving purposes.
Thermal and Fluid Flow of the Air Layer in a Flat Type Solar Collector
Bae, K.Y. ; Yi, C.S. ; Lee, K.S. ; Chung, H.S. ; Jeong, H.M. ;
Journal of the Korean Solar Energy Society, volume 21, issue 3, 2001, Pages 61~68
This study represents numerical analysis on the thermal and fluid flow of the air layer in a solar collector. The boundary conditions was assumed that the top and bottom wall of the air layer have a heating and cooling surface, respectively, and this calculation model have a solid body with a cooling temperature of
. As the results of simulations, the magnitudes of the velocity vectors and isotherms are increased proportionally to the tilt angles. As the tilt angle is increased, the mean Nusselt numbers are increased and the maximum value of the mean Nusselt number was appeared at tilt angle