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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 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
A Study on the Performance of a Hybrid Daylighting System Using AVR Microcontrollers
Lim, Sang Hoon ; Oh, Seung Jin ; Kim, Won-Sik ; Jeong, Hae-Jun ; Chun, Wongee ;
Journal of the Korean Solar Energy Society, volume 35, issue 6, 2015, Pages 1~7
DOI : 10.7836/kses.2015.35.6.001
This paper deals with the design and operation of a hybrid daylighting system that uses natural and artificial lighting to enhance visual comfort in buildings. The system was developed using an AVR micro controller for solar tracking in conjunction with dimming controls, which, acting together, enables the maximum use of natural daylight and also improves energy efficiency in buildings. Experimental results clearly demonstrates the usefulness of the present system capable of enhancing indoor lighting conditions when sufficient daylight is available and distributed appropriately in harmony with artificial lighting.
Parallel operating technique for the stand alone PV PCS
Jeong, Ku-In ; Kwon, Jung-Min ;
Journal of the Korean Solar Energy Society, volume 35, issue 6, 2015, Pages 9~15
DOI : 10.7836/kses.2015.35.6.009
In this paper, a parallel operating technique for the stand alone photovoltaic (PV) power conditioning system (PCS) is proposed. The proposed parallel operating technique can increase the power rating of the system easily. Also, it provide three-phase connection function. The proposed technique does not separated master and slave system. Also, it does not use the separated synchronization line. Therefore, the PCS can supply continuous power even if one of the PCS breaks down. This technique is composed of a phase locked loop (PLL) control, droop control, current limit control and etc. Experimental result obtained on 2-kW prototype to verify the proposed technique.
The Improved Maximum Power Point Tracking Algorithm under varying of irradiance
Lee, Gwui-Han ; Jung, Young-Seok ; Lee, Youn-Seop ; Cha, Han-Ju ; KO, Suk-Whan ;
Journal of the Korean Solar Energy Society, volume 35, issue 6, 2015, Pages 17~24
DOI : 10.7836/kses.2015.35.6.017
The MPPT(Maximum Power Point Tracking) techniques are employed in photovoltaic (PV) systems to maximize the PV array output power which depends on solar irradiance and temperature. The dynamic MPPT performance under varying irradiance conditions affects the impact on overall PV system performance. This paper presents the improved MPPT algorithm by the simulation comparison with other algorithms. The simulation models are made by the Matlab & Simulink. The result of simulation, the dynamic MPPT efficiency of proposed algorithm is higher than the other algorithms.
Heating Performance Characteristics of Heat Pump with VI cycle using Re-Heater and Solar-Assisted
Lee, Jin-Kook ; Choi, Kwang-Hwan ;
Journal of the Korean Solar Energy Society, volume 35, issue 6, 2015, Pages 25~33
DOI : 10.7836/kses.2015.35.6.025
In this study, heating performance of the air-cooled heat pump with vapor-injection (VI) cycles, re-heater and solar heat storage tank was investigated experimentally. Devices used in the experiment were comprised of a VI compressor, re-heater, economizer, variable evaporator, flat-plate solar collector for hot water, thermal storage tank, etc. As working fluid, refrigerant R410A for heat pump and propylene glycol (PG) for solar collector were used. In this experiment, heating performance was compared by three cycles, A, B and C. In case of Cycle B, heat exchange was conducted between VI suction refrigerant and inlet refrigerant of condenser by re-heater (Re-heater in Fig. 3, No. 3) (Cycle B), and Cycle A was not use re-heater on the same operating conditions. In case of Cycle C, outlet refrigerant from evaporator go to thermal storage tank for getting a thermal energy from solar thermal storage tank while re-heater also used. As a result, Cycle C reached the target temperature of water in a shorter time than Cycle B and Cycle A. In addition, it was founded that, as for the coefficient of heating performance(
), the performance in Cycle C was improved by 13.6% higher than the performance of Cycle B shown the average
of 3.0 and by 18.9% higher than the performance of Cycle A shown the average
of 2.86. From this results, It was confirmed that the performance of heat pump system with refrigerant re-heater and VI cycle can be improved by applying solar thermal energy as an auxiliary heat source.
Analysis of the Passive Design Application Status for the Improvement of G-SEED
Kim, Hye-Won ; Tae, Choon-Seob ; Kim, Jun-Tae ;
Journal of the Korean Solar Energy Society, volume 35, issue 6, 2015, Pages 35~42
DOI : 10.7836/kses.2015.35.6.035
The proper use of the passive and active design elements are important for the realization of green buildings. The G-SEED (Green Standard for Energy and Environmental Design) has been implemented in Korea to promote green building construction reflecting these design elements. In this paper, evaluation items of G-SEED which related to the passive design were selected. And improvement direction for the G-SEED was proposed through the analysis of the application status of the passive design elements for the G-SEED certified buildings. This results can be used for developing study on the future improvement of the assessment criteria of G-SEED.
A Study on Improvement of the Assessment Criteria for New and Renewable Energy Facilities in the G-SEED
Kim, Wan-Young ; Tae, Choon-Seob ; Shin, U-Cheol ; Yu, Chang-Kyun ;
Journal of the Korean Solar Energy Society, volume 35, issue 6, 2015, Pages 43~50
DOI : 10.7836/kses.2015.35.6.043
The G-SEED encourages the installation of new and renewable energy facilities through assessments of the new and renewable energy installation rates. The government also regulates the installation rate of new and renewable energy facilities in the `Project on new and renewable energy obligation in public installations`. The current criteria concerning the new and renewable energy facilities in the G-SEED are the result of an amendment made in July 2010. As over five years have passed since this amendment, the assessment criteria needs to be reenforced. To improve the current criteria, the calculation results of the installation rate of new and renewable energy facilities in the G-SEED were analyzed and compared to the corresponding calculation results of the `Project on new and renewable energy obligation in public installations`. And an improved draft for the assessment criteria of the new and renewable energy facilities in the G-SEED was proposed.
A Study on System Optimization according to the Supply Obligations Rate of New and Renewable Energy at an Indoor Gymnasium
Park, Yun-Ha ; Kim, Yun-Ho ; Won, An-Na ; Hwang, Jung-Ha ;
Journal of the Korean Solar Energy Society, volume 35, issue 6, 2015, Pages 51~60
DOI : 10.7836/kses.2015.35.6.051
In statutes on the promotion of distribution of new and renewable energy, which were revised in 2014, daylight system and fuel cell were added in addition to existing new and renewable energy sources. This study, therefore, aimed at setting up targets for the introduction of daylight system and analyzing the installation rate of new and renewable energy which can be provided by daylight system for the aggressive use of daylight system, thereby deducting the optimal combination ratio with other new and renewable energy sources. The results of the study are as follows. First, when a prism-shaped daylight system was installed to a round indoor gymnasium among domestic indoor gymnasiums, out of a supply obligations allotment rate of 15% of new and renewable energy, the rate of daylight system was basically set at 2.5%. Second, therefore, with daylight system coming first, the lacked supply obligations rate was taken up by solar photovoltaic, solar heat and geothermal heat. In addition, using the KRESS Program, economic, technical, environmental and complexity evaluations for the upper 5% was made, deducting the optimal ratio of the system. The results produced the following optimal combination ratios: solar photovoltaic (83.3%) in economic evaluation, solar heat (8.3%) and geothermal heat (75%) in technical evaluation, solar photovoltaic (83.3%) in environmental evaluation, and solar photovoltaic (83.3%, the same as in economic evaluation) in complexity evaluation.