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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 35, Issue 6 - Dec 2015
Volume 35, Issue 5 - Oct 2015
Volume 35, Issue 4 - Aug 2015
Volume 35, Issue 3 - Jun 2015
Volume 35, Issue 2 - Apr 2015
Volume 35, Issue 1 - Feb 2015
Selecting the target year
Development of Passive-Type Daylighting System for Large Space
Sung, Tae-Kyung ; Park, Yeon-Min ; Kim, Joung-Min ; Lee, Chung-Sik ; Lee, Euol-Young ; Joung, Che-Bong ; Kim, Byung-Chul ;
Journal of the Korean Solar Energy Society, volume 35, issue 5, 2015, Pages 1~10
DOI : 10.7836/kses.2015.35.5.001
Whereas recent domestic buildings and industrial facilities are being constructed as large as possible, the daylighting systems for the large space have rarely been developed. Domestic situation has been reported as only several small or medium sized daylighting systems have been developed, and the large scaled systems have entirely being imported from abroad. We have developed a large scaled daylighting system for the big space. The developed system have been evaluated in terms of the average system efficiency and daylighting factor. Each results are shown with tabulated experimental data.
Improvement of Efficiency of Kalina Cycle and Performance Comparison
Yoon, Jung-In ; Son, Chang-Hyo ; Choi, Kwang-Hwan ; Son, Chang-Min ; Seol, Sung-Hoon ; Lee, Ho-Saeng ; Kim, Hyeon-Ju ;
Journal of the Korean Solar Energy Society, volume 35, issue 5, 2015, Pages 11~19
DOI : 10.7836/kses.2015.35.5.011
In this paper, EP-Kalina cycle applying liquid-vapor ejector and motive pump is newly proposed. In this EP-Kalina cycle, the liquid-vapor ejector is used to increase pressure difference between inlet and outlet of the turbine. Also the motive pump enhances the performance of liquid-vapor ejector, resulting in increase of system efficiency of OTEC cycles. The comparison cycles in this study are basic, Kalina, EKalina and EP-Kalina ones. The pump work, net power, APRe, APRc, TPP and system efficiency of each cycle are compared. In case of net power, EP-Kalina cycle is lowest among the cycles due to the application of the motive pump. But, the net power difference of cycles seems to be minor since the pump work of cycles is merely about 1kW, compared to turbine gross power of 20kW. The system efficiency of EP-Kalina cycle shows 3.22%, relatively 44% higher than that of basic OTEC cycle. Therefore, the system efficiency is increased by applying the liquid-vapor ejector and the motive pump. Additional performance analysis is necessary to optimize the proposed EP-Kalina cycle.
Performance Evaluation of Hybrid Solar Air-Water Heater when the Heated Air is used as Inlet Air during Air and Water is Heated Simultaneously
Choi, Hwi-Ung ; Yoon, Jung-In ; Son, Chang-Hyo ; Choi, Kwang-Hwan ;
Journal of the Korean Solar Energy Society, volume 35, issue 5, 2015, Pages 21~29
DOI : 10.7836/kses.2015.35.5.021
In this study, the performance of hybrid solar air-water heater when the heated air was used as inlet air was investigated during air and liquid were heated simultaneously. Temperature difference between inlet air and ambient was set as
and it was maintained during the daily operation. As a result, thermal efficiency of liquid heating was increased when the inlet air temperature was increased and heat gain of the water in heat storage tank was also increased with increment of temperature difference between inlet air and ambient temperature. On the contrary to this, the decrement of air heating efficiency and total efficiency of collector was confirmed with increment of inlet air temperature and it is considered that heat gain of liquid side is lower than heat loss of air side that occurring by using heated air as inlet air of collector. So, from these results, maximum temperature that the liquid in heat storage tank can reach was expected to increase if the return air or any heated air was used as inlet air. But air and total efficiency of hybrid solar air-water is decreased, so using outdoor air as inlet air is considered as better way on perspective of using of solar thermal energy by hybrid solar collector. However, it is hard to conclude that using outdoor air is better than heated air on the perspective of energy saving of building because the performance of heat storage performance was increased even air and total thermal efficiency was decreased, so the necessity of more profound consideration about these result in further research was confirmed for putting the hybrid solar air-water heater to practical use.
A Study on the Development of the Advanced Energy Performance Indicator for the Manufacturing Companies
Rho, Kyung-Wan ; Song, Myung-Ho ;
Journal of the Korean Solar Energy Society, volume 35, issue 5, 2015, Pages 31~38
DOI : 10.7836/kses.2015.35.5.031
It is important to improve the energy performance in the industrial sector, and therefore most of the manufacturing companies need the energy performance indicators to identify the target and to verify the energy savings. However, the conventional energy performance indicators such as the total energy consumption and the energy intensity are not proper to use. The reason is that they do not consider adequate relevant variables including productions in the boundary of the manufacturing companies. Therefore, the study provides the advanced energy performance indicator using by the linear regression model according to each energy source to manage the target and to verify the energy performance properly.
Application of the Solar Chimney System for Improving the Thermal Environment in Winter
Oh, Ju-Hong ; Kim, Eui-Jong ; Lee, Hyun-Soo ; Suh, Seung-Jik ;
Journal of the Korean Solar Energy Society, volume 35, issue 5, 2015, Pages 39~48
DOI : 10.7836/kses.2015.35.5.039
In this study, the solar chimney, one of the passive solar systems, is proposed as a method to improve the thermal environment of northern zones in buildings. As this well-known system has rarely been used in building projects, an adequate application of the system is proposed in this paper: the solar chimney system is designed to meet the required ventilation rate and consequently to reduce the ventilation load in the northern part of a building. To investigate such a possibility, a numerical model for the system is developed, and results of numerical tests are used for energy simulations. The results were taken into account for test simulations in EnergyPlus. As a result, approximately 75% of the volumetric ventilation rate required in the north zone could be supplied with the air volume acquired through the system and the monthly mean load was reduced by 29.5%, from 1.584 kWh to 1.117 kWh. The analyses of hourly mean heating and ventilation load over the heating period indicated that the system was very effective at around 13:00. Results show that 33% reduction in the ventilation load and 17% in the heating load for the north zone could be acquired through this system.
Study on Heating Performance of Hybrid Heat Pump System Using Geothermal Source and Solar Heat for Protected Horticulture
Jeon, Jong Gil ; Lee, Dong Geon ; Paek, Yee ; Kim, Hyung Gweon ;
Journal of the Korean Solar Energy Society, volume 35, issue 5, 2015, Pages 49~56
DOI : 10.7836/kses.2015.35.5.049
In this study a hybrid heating system based on geothermal source and solar heat was developed in order to save energy for greenhouse heating and its field performance was evaluated. Developed system are composed of following parts: water tank, heat exchanger, heat pump, fan coil unit and heat storage unit. The working performance test was carried out in a greenhouse cultivating oriental orchids being managed by
. Field performance test results showed that average heating coefficient of performance (
) was 3.4 for the period from mid-January to mid-March 2013. Heating coefficient of performance (
) of developed hybrid heat pump system was more sensitive to water tank temperature than outside air temperature. This study showed that developed hybrid heat pump system has a potential to save the heating costs up to 91% compared to conventional agricultural oil heaters.
PID Recovery Characteristics of Photovoltaic Modules in Various Environmental Conditions
Lee, Eun-Suk ; Jung, Tea-Hee ; Go, Seok-Hwan ; Ju, Young-Chul ; Chang, Hyo Sik ; Kang, Gi-Hwan ;
Journal of the Korean Solar Energy Society, volume 35, issue 5, 2015, Pages 57~65
DOI : 10.7836/kses.2015.35.5.057
The Potential Induced Degradation(PID) in PV module mainly affected by various performance conditions such as a potential difference between solar cell and frame, ambient temperature and relative humidity. The positive charges as sodium ions in front glass reach solar cell in module by a potential difference and are accumulated in the solar cell. The ions accelerate the recombination of generation electrons within solar cell under illumination, which reduces the entire output of module. Recently, it was generally known that PID generation is suppressed by controlling the thickness of SiNx AR coating layer on solar cell or using Sodium-free glass and high resistivity encapsulant. However, recovery effects for module with PID are required, because those methods permanently prevent generating PID of module. PID recovery method that voltage reversely applies between solar cell and frame contract to PID generation begins to receive attention. In this paper, PID recovery tests by using voltage under various outdoor conditions as humidity, temperature, voltage are conducted to effectively mitigate PID in module. We confirm that this recovery method perfectly eliminates PID of solar cell according to repeative PID generation and recovery as well as the applied voltage of three factors mainly affect PID recovery.