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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 22, Issue 4 - Dec 2002
Volume 22, Issue 3 - Sep 2002
Volume 22, Issue 2 - Jun 2002
Volume 22, Issue 1 - Mar 2002
Selecting the target year
Study on the Regenerating Performance of Liquid Desiccant in the Cooling/Dehumidification System able to use a Solar Water Heater in Summer(On the Analysis of Source Effect by the Design of Experiments)
Choi, K.H. ; Kim, B.C. ; Kim, B.J. ;
Journal of the Korean Solar Energy Society, volume 22, issue 1, 2002, Pages 1~8
With the possibility of hot water being able to be used as a heating source in a liquid desiccant system, an experimental apparatus for regeneration of the liquid desiccant was set up and series of experiments were conducted in a climate-controlled chamber. This study was performed to ascertain the influences of experimental factors on regenerating performance and to suggest the optimal combination of factors affecting regeneration rate. Furthermore. in order to figure out the contribution ratio of the factors on regenerating performance, a multi-way factorial design among the design of experiments was adopted. According to experimental results, the most influential factor on regenerating performance was temperature of the liquid desiccant and its contribution ratio was about 79.4%. In addition. the optimal operating combination was as follows;
of solution temperature,
/min of solution flow rate, and 190m3/h of air volume.
A Study on Heat Storage System Using Calcined Dolomite - Numerical Analysis of Heat Transfer in Calcined Dolomite Hydration Pocked Bed -
Park, Young-Hae ; Kim, Jong-Shik ;
Journal of the Korean Solar Energy Society, volume 22, issue 1, 2002, Pages 9~21
To develope chemical heat pump using available energy sources, solar heat and other kinds of waste thermal energy, we have studied the heat transfer rate in cylindrical bed reactor packed with calcined Dolomite. Two dimensional (radial and circumferential) Partial differential equations, concerning heat and mass transfer in packed bed of calcined Dolomite, are solved numerically to describe the characteristics of the reaction of calcined Dolomite and heat transfer. The results obtained by numerical analysis about two dimensional profiles of temperature and conversion of reactant in the packed bed reactor and the amount of exothermic heat released from the reactor are follows. It was found that all of calcined Dolomite packed bed kept the reaction temperature of about 750K throughout the entire part of the bed, immediately after the steam was introduced exothermic reaction of hydration was proceeded from the packed bed inpu to output and from wall side to center. The rate of thermochemical reaction depends on the temperature and concentration and it is also governed by the boundary conditions and heat transfer rate in the particle packed bed.
A Study on the Performance of the Heat Transfer for the Liquid Filling as the Ratio of Working Fluid Volume to Total Volume of the Thermosyphon with Axial Internal Fins
Lee, Jung-Han ; Lee, Ki-Baik ; Cho, Dong-Hyun ;
Journal of the Korean Solar Energy Society, volume 22, issue 1, 2002, Pages 23~30
This study concerns the performance of the heat transfer of the thermosyphon having 80 internal fins in which boiling and condensation occur. Water has been used as the working fluid. The Liquid filling as the ratio of working fluid volume to total volume of thermosyphon have been used as the experimental parameters. The heat flux and heat transfer coefficient at the condenser are estimated from the experimental results. The experimental results have been assessed and compared with existing theories. As a result of the experimental investigation we can state that the maximum heat flow rate in the thermosyphon prove to depend upon the liquid fill quantity. The relatively high rates of heat transfer have been achived operating in the thermosyphon with axial internal fins. Also, the thermosyphon with internal micro fins can be used to achieve some inexpensive and compact heat exchangers in low temperature. In addition, it is to obtain the overall heat transfer coefficients and the characteristics as a operating temperature for the practical applications.
A Study on the Development of Thermal Storage Units for Efficient Utilization of Solar Systems
Chun, Won-Gee ; Lee, Jae-Young ;
Journal of the Korean Solar Energy Society, volume 22, issue 1, 2002, Pages 31~42
This study has been carried out to design a number of storage units which could improve the utilizability of solar energy by offering convenient means to store it. The proposed units are systematically tested to establish their reliability in actual operations. One of the prominent features of the present storage units is that each design is meant to drastically improve the thermal response of solar systems which would definitely offer extreme convenience to whoever uses it. Also sought in the present study is to elicit ideal operating conditions during the storage and extraction phases of solar energy once it is delivered to the storage unit. The present study has confirmed the potential use of the proposed units with their applicability in capitalizing the sun's energy.
A Study on the Performance Improvement of All-Glass type Solar Vacuum Collectors
Kang, Sang-Hoon ; Chun, Won-Gee ;
Journal of the Korean Solar Energy Society, volume 22, issue 1, 2002, Pages 43~53
This study has been carried out to study the thermal performance of an all-glass type solar collector tube when a heat transfer medium is used with a heat storage unit capable of preventing pressure build-up within the tube. The heat storage unit is devised such that it performs the dual function of relieving excessive pressure and storing solar thermal energy. Different types of heat storage medium are tested under heat-up phase of a collector tube. It is found that the proposed unit could be used quite effectively if one wishes to capitalize more aggressively in harnessing the solar energy.
Atmospheric Clearness Estimation of Major Cities in Korea Using Decision Support Models
Jo, D.K. ; Chun, I.S. ; Kang, Y.H. ; Jeon, M.S. ; Auh, C.M. ;
Journal of the Korean Solar Energy Society, volume 22, issue 1, 2002, Pages 55~65
Since the atmospheric clearness index is one of the main factors for evaluating atmospheric circumstances, it is necessary to estimate its characteristics all over the cities in Korea. This study was focused on the evaluation of atmospheric condition for each 15 cities in terms of respectively or mutually analyzed clearness factor that was predicted on the assumed clear day with the model using factors such as average global insolation, cloud amount, and duration of sunshine measured for two years between 1999 and 2000. The new clearness index data will be extensively used by atmospheric circumstances analysts as well as by solar application designers or users.
Performance Monitoring Study of Unglazed Transpired Solar Air Heating Module
Kang, Eun-Chul ; Hyun, Myung-Taek ; Lee, Euy-Joon ;
Journal of the Korean Solar Energy Society, volume 22, issue 1, 2002, Pages 67~72
Solar Air Systems (SAS) have unique advantages for space heating and tempering ventilation air. Air, unlike water, needs no protection against freezing nor are leaks damaging to the building structure or its contents. In contrast to glazed collector, unglazed steel solar collector may have higher efficiencies over glazed flat collector due to the absence of the glass. Therefore, the monitoring of SAS is so important to evaluate actual performance of SAS for right applications. This study is to provide a testing method with a movable test cell developed in KIER to evaluate the thermal performance of SAS based on international standard method ASHRAE 93-86, "Method of Testing to Determine the Thermal Performance of Solar Collectors". The monitoring tool used advanced technique LabVIEW 6i with portable notebook computer. Sample results have been obtained to access the performance of a reference and a target SAS module. The process and tool introduced here could be used to provide a performance verification data for future implementation study applications.
An Experimental Study on the Thermal Performance by the Type of Thermal Insulation in Basement Structures
Lee, J.Y. ;
Journal of the Korean Solar Energy Society, volume 22, issue 1, 2002, Pages 73~80
This is study of the planning of thermal insulation to prevent heat loss in a basement, is aimed at investigating the heat loss from the basement space and basement structures. The results analyzed in these researches are as follows; To analyze the heat loss from basement structures, this study experimented on the heat flow phenomenon of a non-insulation structure and two insulation structure models. From the result, the interior surface temperature of two insulation structures(B, C, model) showed an equal temperature, but the interior surface temperature of a non-insulation structure (A model) is different from the two models, Therefore, we understand that the insulator constructed in the basement structure makes a role of preventing the heat loss from the basement. In addition, the exterior surface temperature of two insulation structure models showed an equal temperature. Specially, judging from the temperature difference of C model. we understand that the performance of insulator is low under the definite depth of underground. The thermal insulation design should be constructed under the definite depth of underground considering outdoor and building conditions.
A Study on Solar Light Collector using Fresnel Lens Film
Jeong, H.G. ; Han, S.B. ; Jung, B.M. ; Lee, E.J. ; Lim, S.H. ;
Journal of the Korean Solar Energy Society, volume 22, issue 1, 2002, Pages 81~86
Solar daylighting system provides free and comfort lighting, but its design and control has been key issue due to heavy light collecting system. One of the solutions for the heavy weight issues would be using a light framed film such as fresnel and prism lens. This prototype system consists of light collector, light transformer and light guide luminaire. The light collector which is installed at window or the rooftop concentrates solar light, the collected beam is converted to suitable light by the light transformer. and the prism light guide luminaire has been used to distribute light emitted from light transformer for illumination. In this paper, the design concept and performance of light collector in this prototype system are presented.