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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
Editor in Chief :
Volume & Issues
Volume 30, Issue 6 - Dec 2010
Volume 30, Issue 5 - Oct 2010
Volume 30, Issue 4 - Aug 2010
Volume 30, Issue 3 - Jun 2010
Volume 30, Issue 2 - Apr 2010
Volume 30, Issue 1 - Feb 2010
Selecting the target year
of Renovation for Green Building of Public BuildingA Study on Adequacy
Hyun, Gun-Chul ; Kim, Tae-Il ; Yang, Gun ;
Journal of the Korean Solar Energy Society, volume 30, issue 5, 2010, Pages 1~10
The aims of this study is to analyze that the double-skinned outer surface of building will be the effective measure to improve the use of space and save energy through the evaluation of the buildings renovation. In other words, it is significantly effective to increase the insulation of the outer surface where the most heat loss occurs; it is also energy-saving to convert the space created by pilotis in the southern and northern parts of the buildings into an double-skinned atrium. Research methods of this study are consisted with two steps, situation analysis and simulation analysis. IRISYS 1000 Series Imager was used for research of situation analysis and Visual DOE 4.0 was used for simulation analysis with the 1st Buildings of Jeju Special self-Governing Province. As results of simulation, it was proved that Double skin Method is more effective for green building than basic model. it was predicted to save 8.6% of energy by Double skin Method. Especially, in case of using of ventilation within double-skinned atrium, it was predicted that saving of energy was most effective than other method.
Effect of Oxidation Multi-Walled Carbon Nanotubes for Methane Hydrate Formation
Park, Sung-Seek ; Kim, Nam-Jin ;
Journal of the Korean Solar Energy Society, volume 30, issue 5, 2010, Pages 11~16
Methane hydrate is crystalline ice-like compounds which formed methane gas enters within water molecules composed cavity and each other from physically-bond at specially temperature and pressure condition.
of methane hydrate can be decomposed into the maximum of
of methane gas under standard condition. If these characteristics of hydrate are utilized in the opposite sense, natural gas can be fixed into water in the form of a hydrate solid. Therefore the use of hydrate is considered to be a great way to transport and store natural gas in large quantity. However, when methane hydrate is formed artificially, the amount of gas that is consumed is relatively low, due to the slow reaction rate between water and methane gas. Therefore for practical purposes in the application, the present investigation focuses on increasing the amount of gas consumed by adding chemically oxidized OMWCNTs to pure water. The results show that when 0.003 wt% of oxidation multi-walled carbon nanotubes was added to pure water, the amount of gas consumed was almost four times more than that of pure water indicating its effect in hydrate formation and the hydrate formation time decreased at alow subcooling temperature.
A Study on Heat and Mass Transfer with the Different Flows in a Solar Desiccant Cooling System
Eflita, Yohana ; Choi, Kwang-Hwan ;
Journal of the Korean Solar Energy Society, volume 30, issue 5, 2010, Pages 17~24
An Experimental Study on the Scale Correction of Measured Horizontal Global Solar Radiation
Song, Su-Won ;
Journal of the Korean Solar Energy Society, volume 30, issue 5, 2010, Pages 25~31
A Precision Spectral Pyranometer (PSP) is mainly used as a reference to calibrate other pyranometers due to its high accuracy and sensitivity in response to the spectrum wavelength range of 0.285
, while the sensitivity of photovoltaic-type Li-Cor pyranometer is limited within a certain spectral range from 0.4
. In this study, two Eppley PSPs(
) were first compared to the calibrated Eppley PSPs from National Renewable Energy Laboratory (NREL), resulting in two linear correction factors based on the comparison between the logger output (V) from the test PSP and the solar radiation (W/m2) from the NREL PSP. The Li-Cor pyranometer used in this study was then corrected based on the comparison of measured solar radiation (
) from the corrected
and the Li-Cor pyranometer. In addition, instrument scale corrections were also performed for the PSPs and the Li-Cor from the transmitter to the data logger. From the comparisons, a linear correction factor (1.0214) with R=0.9998 was developed for the scale correction between
, while the Li-Cor pyranometer has a scale(1.0597) and offset (32.046) with R=0.9998 against
. As a result, it was identified that there were good agreements within
solar radiation and within
vs Li-Cor solar radiation after the empirical scale corrections developed in this study.
Study on the Evaluation of Regional Building Energy Efficiency Rating According to the Insulation Performance of Double Skin Window in Apartment Houses Expanded Balcony
Jang, Cheol-Yong ; Ahn, Byung-Lip ; Kim, Chi-Hoon ; Hong, Won-Hwa ;
Journal of the Korean Solar Energy Society, volume 30, issue 5, 2010, Pages 32~37
In order to handle the crisis about energy-environment problem, it is necessary to develop the future-oriented and innovative energy technology in architecture area. So the development of new technology for energy saving and alternative energy use has been spurred in this area. Double skin window system, which is an active covering to respond to the exterior change of the environment, is the skill that can reduce the indoor cooling and heating load and the environmental architecture can be realized. This study works out U-value of windows using the window-simulation program with the development and study of the double skin. In addition, the effect of the double skin insulation on the efficiency rating has been analyzed, applying to the certification system of the building energy efficiency rating which has implemented.
The Building Energy Efficiency Rating Evaluation of Apartment depending on SC and Window area ratio
Jang, Cheol-Yong ; Han, Hye-Sim ; Lee, Jin-Sook ;
Journal of the Korean Solar Energy Society, volume 30, issue 5, 2010, Pages 38~43
Enhancement of exterior's insulation performance like wall or window etc. is general way for building's energy efficient and thermal performance. But exterior's opening plan is important for minimizing the energy consumption and heat loss. In this paper, energy saving rate will be analyzed and compared considering the window area's rate and window's SC(Shading Coefficient) in a apartment with Building Energy Efficiency Rating System's evaluation tool. In the process of evaluation, energy saving rate is measured at each stage of the window area's rate from 20% to 60% every 10% term and the shading coefficient value from 1.0 to 0.6. As a result of this research, energy saving evaluation could not be measured exactly with existing evaluation tool. Accord this research, Building Energy Rating System's evaluation range is needed to be broaden for exact evaluation of energy saving rate.
Review on The Proposed Offshore Wind Farm Projects Using National Wind Atlas and National Geographic Information
Kim, Hyun-Goo ; Hwang, Hyo-Jung ;
Journal of the Korean Solar Energy Society, volume 30, issue 5, 2010, Pages 44~55
The proposed offshore wind farm projects, i.e., Mooudo offshore, Yeonggwang-Gochang offshore, Saemangeum offshore, Imjado offshore and Gadeokdo-Dadeapo offshore, were compared and analyzed using the Korea National Wind Mapand Wind Farm Suitability Assessment System developed by the Korea Institute of Energy Research. The suitability of the proposed areas was comprehensively assessed using geographic, economic constraints, wave condition and wind resource factors, but the focus of this paper was on the geographic constraints and wave conditions. Imjado had several geographical constraints, despite having a good wind power density, while Saemangeum had a relatively low wave height, shallow water depth, close substation and slow tidal current. It is anticipating that the present comparison and analysis could be used as reference guidelines when selecting and preparing the design of large-scale offshore wind farm in the near future.
A Study on the Performance Comparisons of Air Type BIPVT Collector Applied on Roofs and Facades
Kang, Jun-Gu ; Kim, Jin-Hee ; Kim, Jun-Tae ;
Journal of the Korean Solar Energy Society, volume 30, issue 5, 2010, Pages 56~62
The integration of PV modules into building facades or roof could raise their temperature that results in the reduction of PV system's electrical power generation. Hot air can be extracted from the space between PV modules and building envelope, and used for heating in buildings. PV/thermal collectors, or more generally known as PVT collectors, are devices that operate simultaneously to convert solar energy from the sun into two other useful energies, namely, electricity and heat. This paper compares the experimental performance of BIPVT((Building-Integrated Photovoltaic Thermal) collectors that applied on building roof and facade. There are four different cases: a roof-integrated PVT type and a facade-integrated PVT type, the base models with an air gap between the PV module and the surface, and the improved models for each types with aluminum fins attached to the PV modules. The accumulated thermal energy of the roof-integrated type was 15.8% higher than the facade-integrated regardless of fin attachment. The accumulated electrical energy of the roof-integrated type was 7.6% higher, compared to that of the facade-integrated. The efficiency differences among the collectors may be due to the fact that the pins absorbed heat from the PV module and emitted it to air layer.
Suggestion of Long-term Life Time Test for PV Module in Highly Stressed Conditions
Kim, Kyung-Soo ; Kang, Gi-Hwan ; Yu, Gwon-Jong ; Yoon, Soon-Gil ;
Journal of the Korean Solar Energy Society, volume 30, issue 5, 2010, Pages 63~68
To guarantee life time more than 20 years for manufacturer without stopping photovoltaic(PV) system, it is really important to test the module in realistic time and condition compared to outside weather. In here, we tested PV modules in highly stressed condition compared to IEC standards. In IEC 61215 and IEC 61646 standards, damp-heat, thermal cycle(TC200) and mechanical test are main test items for evaluating long-term durability of PV module in controlled temperature and humidity condition. So in this paper, we have lengthened the test time for TC200 and damp-heat test and increased the loading stress on surface of module. Through this test, we can get some clue of proper the method for measuring realistic life cycle of PV modules and suggested the minimum time for PV test method. The detail description is specified as the following paper.
A Study on the Operating Characteristics of Solar Collecting System in Solar Thermal/Geothermal Hybrid System with Facade Integrated Solar Collector
Baek, Nam-Choon ; Lee, Jin-Kook ; Yu, Chang-Kyun ; Yoon, Eung-Sang ; Yoon, Jong-Ho ;
Journal of the Korean Solar Energy Society, volume 30, issue 5, 2010, Pages 69~76
In this study, the solar thermal and geo-source heat pump(GSHP) hybrid system for heating and cooling of Zero Energy Solar House(ZESH) was analyzed by experiment. The GSHP in this hybrid system works like as aback-up device for solar thermal system. This hybrid system was designed and installed for Zero Energy Solar House (KIER ZeSH) in Korea Institute of Energy Research. The purpose of this study is to find out that this system is optimized and operated normally for the heating load of ZeSH. The analysis was conducted as followings ; - the thermal performance of facade integrated solar collector - the on/off characteristics of solar system and GSHP - the contribution of solar thermal system. - the performance of solar thermal and ground source heat pump system respectively. - the meet of thermal load (space and water heating load). This experimental study could be useful for the optimization of this system as well as its application in house. This hybrid system could be commercialized for the green home if it is developed to a package type.
Continuous Commissioning Process and Application
Cho, Young-Hum ;
Journal of the Korean Solar Energy Society, volume 30, issue 5, 2010, Pages 77~84
This paper presents the continuous commissioning process, information on the case study facility, improved system operation, and building energy consumption measures before and after continuous commissioning implementation. Continuous commissioning is an ongoing process to resolve operating problems, improve comfort, optimize energy use and identify retrofits for existing commercial and institutional buildings and central plant facilities. Continuous commissioning process consists of two phases. The first phase is the project development phase and the second phase implements and verifies project performance. Results of a case study show that continuous commissioning implementation can reduce energy costs. The energy reports show the electricity savings of 22% and gas savings of 47% on an average.
Movable BIPV Shading Device Design for Apartment Building Balcony
Chin, Kyung-Il ; Yoon, Jong-Ho ;
Journal of the Korean Solar Energy Society, volume 30, issue 5, 2010, Pages 85~92
At the beginning the 21st century, we are interested in renewable energy especially photovoltaic. So, we have been installed PV at the building roofs so that we call it building integrated photovoltaic. But strictly speaking, installing the PV on the roof is not building integrated. There are few BIPV designs especially for balcony. In the apartment building, roof is good installing place for PV, but its area was limited. Now a day, built apartment building's heights are more and more increased so that the performance of installed PV on the roof cannot be enough to use even the public use. Thereby, we need the new space in the building to install the PV except the building roof. This study suggests the building facade balcony as a new space to install the PV with building integrated PV design. Hence, in this study, we are designed the movable BIPV shading device for apartment building balcony, and verified its performance with computer simulation. Developed device in this study can works as an electronic generation device and an overhang on the side balcony. As a result, the electronic generation performance of device contributes 15~30% to each apartment unit. The more unit width increase, the better contributed device generates.
Effect of channel hight on Bubble growth under Saturated Nucleate Pool Boiling for Various Channel Height using Heater with Artificial Cavity
Kim, Jeong-Bae ; Park, Moon-Hee ; Jeon, Woo-Cheol ;
Journal of the Korean Solar Energy Society, volume 30, issue 5, 2010, Pages 93~99
Nucleate pool boiling experiments with constant heat flux condition were performed using pure R113 for various channel heights under saturated pool condition. A circular heater of 1mm diameter, with artificial cavity in the center, fabricated using MEMS technique and the high-speed controller were used to maintain the constant heat flux. Images of bubble growth were taken at 5,000 frames per second using a high-speed CCD camera. The bubble geometry was obtained from the captured bubble images. The effects of channel height on the bubble growth behaviors were analyzed as dimensional scales for the initial and thermal growth regions. The parameters for the bubble growth behaviors were bubble radius, bubble growth rate, and bubble shapes. These phenomena require further analysis for various surface angles, but this study will provide good experimental data with constant heat flux boundary condition for such works.
Prediction of the Summer Effective Sky Temperatrure during the Clear Day on Osan City
Byun, Ki-Hong ;
Journal of the Korean Solar Energy Society, volume 30, issue 5, 2010, Pages 100~106
The purpose of this study is to predict the effective sky temperature on Osan City during the summer. The north latitude, east longitude of Osan City is
. The altitude from the sea level is 48m. Empirical relations of the effective sky temperature suggested by Duffie and Beckman are compared on clear days. For the effective sky temperature prediction, data measured by the Korea Meteorological Administration is used as an input to the Bliss model. Both Hottel and Krondratyev model are used to calculate the water vapor emissivity. The results using Hottel's model match well with the empirical relation proposed by Bliss. The results show maximum, minimum, and average values depending on water vapor emissivity model. The maximum deviation is about 10K and is due to total emissivity model.
A Study of Reflectance Variations of Solar Concentrators
Lee, Hyun-Jin ; Kim, Jong-Kyu ; Lee, Sang-Nam ; Kang, Yong-Heack ; Lee, Seong-Uk ; Park, Moon-Hee ;
Journal of the Korean Solar Energy Society, volume 30, issue 5, 2010, Pages 107~114
Understanding of reflectance of solar concentrators is important for assessing concentration performance. However inaccurate data about refractive indices of constituent materials and dust accumulation on the surface often prevent figuring out reflectance variations. The current study proposes an approach calculating concentrator reflectance based on the refractive index of glass obtained from reflectance and transmittance measurements. This approach improved accuracy of solar-averaged reflectance from 2.9% to 0.4% compared to the use of existing reference data. Reflectance variations with incidence angles are negligible up to
at various glass thicknesses. When concentrators are contaminated with dust during 2 months specular reflectance loss of vertically exposed concentrators is less than 7%. However for horizontally exposed concentrators the loss significantly increases up to 40% while dependence of reflectance on incidence angles becomes strong. Measurements of hemispherical reflectance indicate that 80 percentage of the loss comes from scattering rather than absorption by dust. Data of refractive index and reflectance provided in the current study will help estimate or model the concentrated solar flux.