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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 27, Issue 4 - Dec 2007
Volume 27, Issue 3 - Sep 2007
Volume 27, Issue 2 - Jun 2007
Volume 27, Issue 1 - Mar 2007
Selecting the target year
Analysis of Maximum Power Generation of Photovoltaic Module Depending on Constituent Materials and Incident Light Characteristics
Kang, Gi-Hwan ; Kim, Kyung-Soo ; Park, Chi-Hong ; Yu, Gwon-Jong ; Ahn, Hyung-Keun ; Han, Deuk-Young ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 1~6
In this study, we analyze the maximum power generation of photovoltaic(PV) module depending on constituent materials and incidence angle dependence of light. To verify characteristics of constituent materials, we made photovoltaic modules with 4 kinds of solar cells and textured glass according to fabrication method. To find the degree of the maximum power generation dependence on intensity of light, Solar Simulator is applied by changing angle of module and light intensity. Through this experiment, to obtain maximum power generation from limited PV modules, it is needed to fully understand constituent materials, fabrication method and dependence of incident light characteristics.
An Experimental Study on the Thermal Characteristics of Hybrid Solar Receiver for Dish/Stirling System
Kang, Myeong-Cheol ; Kim, Jin-Soo ; Kang, Yong-Heack ; Kim, Nack-Joo ; Yoo, Seong-Yeon ; Kim, Jin-Heack ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 7~13
A Dish type solar concentrating system consists of a parabolic concentrator and a cavity receiver. In order to achieve high temperatures from solar energy, it is essential to efficiently reflect the solar rays in the concentrator and to minimize thermal losses in the cavity receiver. Improving the economical efficiency of a solar power system required the stirling unit to be operated continuously. For continuous operation of the stilting unit, the receiver must be continuously provided with thermal energy from solar as well as additional combustion heat. It is possible for a hybrid solar receiver system equipped with an additional combustion to be operated 24 hrs/day. A hybrid solar receiver was designed and manufactured for a total thermal load of 35 kW in the operating temperature range
. The hybrid receiver system was tested in gas-only mode by gas-fired heat to investigate thermal characteristics at inclination angle varying from 0 deg to 30 deg(cavity facing down) and the aperture to cavity diameter ratios of 0(closed cavity) and 1.0(open cavity). This paper has been conducted to measure temperature distribution in cavity surface and to analyze thermal resistances, and the evaporation and condensation heat transfer coefficient in all cases(open and closed cavity).
A Study on the Thermal Environment in the Multipurpose Greenhouse in Winter
Kim, Soon-Joo ; Na, Su-Yeun ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 15~21
The purpose of this study is to provide the basic data for passive control and energy conservation strategies of multipurpose greenhouse. Passive design strategies which are appropriate to Jeju environmental circumstance were applied in the multipurpose greenhouse. The field measurement were conducted to examine relationship of micro climate and indoor thermal environment in the multipurpose greenhouse. The result of this study can be summarized as follow ; (1) The indoor temperature was ranged from 5 to
without a heating system, when the exterior temperature was -1 to
. (2) The multi-purpose greenhouse requires almost no heating energy in winter, when it is used as a greenhouse, an exhibition hall or a cafeteria.
The Analysis on Maximum Output Power Characteristics of Crystalline Silicon Photovoltaic Module by Change of Environmental Effects
Kang, Gi-Hwan ; Kim, Kyung-Soo ; Park, Chi-Hong ; Yu, Gwon-Jong ; Ahn, Hyung-Keun ; Han, Deuk-Young ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 23~28
In this study, we analyzed the maximum output power characteristics of crystalline silicon photovoltaic module by change of environmental effects. The electrical, optical and thermal property of PV modules were investigated during outdoor test period about 70 days. There was a fluctuation in maximum output power by change in transmittance caused by environment effects like rain, snow and dust. The effects of external environmental change were analyzed using climate data. Also local thermal temperature variation and transmittance imbalance on surface of PV module which might lead degradation of constituent material were detected using infrared camera. The further analysis is describe in the following paper.
Wind Resource Assessment of the Antarctic King Sejong Station by Computational Flow Analysis
Kim, Seok-Woo ; Kim, Hyun-Goo ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 29~35
In accordance with Madrid and Kyoto Protocols, a 10kw wind turbine installed about 625m away from the King Sejong Station in the Antarctica has been in operation successfully. The current location of the wind turbine has different geographic surroundings from the previous candidate site considered in 2005 and that makes re-evaluation of wind resource at the current site including geographic effects necessary. Especially, strong wind flow derived by steep and complex terrain is dominant in the Antarctica so that computational flow analysis is required. The wind rose measured at the previous and current installation location are identical with strong meteorological correlation but prevailing directions of wind power density are different because of local wind acceleration due to complex terrain. Numerical analysis explains which effects brings this discordance between the two sites, and a design guideline required for additional wind turbine installation has been secured.
Cycle Simulation on OTEC System using the Condenser Effluent from Nuclear Power Plant
Kim, Nam-Jin ; Jeon, Young-Han ; Kim, Chong-Bo ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 37~44
For the past few years, the concern for clean energy has been greatly increased. Ocean Thermal Energy Conversion(OTEC) power plants are studied as a viable option for the supply of clean energy. In this paper, the thermodynamic performance of OTEC cycle was examined. Computer simulation programs were developed under the same condition and various working fluids for closed Rankine cycle, regeneration cycle, Kalina cycle, open cycle and hybrid cycle. The results show that the regeneration cycle using R125 showed a 0.17 to 1.56% increase in energy efficiency, and simple Rankine cycle can generate electricity when the difference in warm and cold sea water inlet temperatures are greater than
. Also, the cycle efficiency of OTEC power plant using the condenser effluent from nuclear power plant instead of the surface water increased about 2%.
Design Modification of a Thermal Storage Tank of Natural-Circulation Solar Water Heater for a Pressurized System
Boo, Joon-Hong ; Jung, Eui-Guk ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 45~54
For a conventional natural-circulation type solar water heater, the pressure head is limited by the height between the storage tank and hot water tap. Therefore, it is difficult to provide sufficient hot water flow rate for general usage. This study deals with a design modification of the storage tank to utilize the tap-water pressure to increase hot-water supply Based on fluid dynamic and heat transfer theories, a series of modeling and simulation is conducted to achieve practical design requirements. An experimental setup is built and tested and the results are compared with theoretical simulation model. The storage tank capacity is 240 l and the outer diameter of piping was 15 mm. Number of tube turns tested are 5, 10, and 15. Starting with initial storage tank temperature of
, the temperature variation of the supply hot water is investigated against time, while maintaining minimum flow rate of 10 1/min. Typical results show that the hot water supply of minimum
can be maintained for 34 min with tap-water supply pressure of 2.5 atm, The relative errors between modeling and experiments coincide well within 10% in most cases.
Estimation of Indoor Environment using CFD of Multi-Purpose System with a Solar Collector -Part 1, focused on floor area and number of ventilation-
Kim, Jong-Ryeol ; Choi, Kyang-Hyan ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 55~61
This paper has been conducted to estimate cooling capacity of the dehumidification tower using hot water from a solar water heating system as a energy source of regeneration process when the dehumidification and drying system is applied to room cooling. A solar water heating system was operated and indoor temperature distributions were simulated according to weather conditions when the concerned solution was used to dehumidify room air in the dehumidification tower. Through this simulation researches we found th following results ; It was found that air velocity through supply and return diffusers should be controlled because it can cause uncomfort in dwelling area. It was found that in the sunny morning temperatures of dwelling area 1 and 2 are higher than those of dwelling area 3 and 4. In this research all the calculation results of heating and cooling system supported by solar water heater have confirmed that its cooling capacity could not reach PMV 0, thermal comfort.
Heat Transfer Characteristics of High Temperature molten salt storage for Solar Thermal Power Generation
Aiming, Mao ; KIm, Ki-Man ; Han, Gui-Young ; Seo, Tae-Beom ; Kang, Yong-Heack ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 63~69
The heat transfer characteristics of inorganic salt for high temperature heat storage material of solar power system were examined. The inorganic salts employed in this study was a mixture of
and the operating temperature range was determined by measuring the melting temperature with DSC and by measuring the thermal decomposition temperature with TGA. The heat transfer characteristics was qualitatively obtained in terms of temperature profiles of salt in the tanks during the heat storage and heat release process as a function of steam flow rates, steam inlet temperature and the inlet position of steam. The effects of steam flow rates and inlet temperature of steam were experimentally determined and the effect of natural convection was observed due to significant density difference with temperature.
A Study on Estimation of Ventilation Performance in the Underground Parking Lot
Hwang, Min-Kyu ; Kim, Seong-Sik ; Kim, Kang-Soo ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 71~77
In past, parking lot was placed on the ground and for the reason air quality was not in problem. But recently parking lot has been placed under the ground and the air quality becomes problem. So in this study, the ventilation performance on the underground parking lot was estimated by using CFD software and alternative system was suggested. Three case studies are handled in this study. 1st case is just an underground parking lot. 2nd case is about an underground parking lot where has 4 fan rooms on each floor and 3rd case is about an underground parking lot where has 4 fan rooms and 30 guidance fans on each floor.
A Study on Application of Radiant Floor Heating in Large Space
Ahn, Min-Hee ; Choi, Chang-Ho ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 79~85
This paper addresses the indoor air quality when radiant floor heating is applied in large space. Radiant heat exchange between surfaces depends on the orientation and the temperature of the surfaces. Also, the temperature and the radiant characteristic of the wall and the roof that face the floor have great influence on the indoor air environment due to the largeness of the wall and the roof in large spaces. In this study, we simulate a test-cell(25X20X10) using a ies YE And using a CFD(microflo in VE), an indoor air environment was investigated to establish the optimum temperature of floor. At the first time of the heating, high floor temperature is demanded. At the middle of the heating, however, the temperature of the residential space was formed appropriately, although the temperature of the floor was set low.
Thermodynamic Analysis of a Double-Effect Absorption Heating System Using Water-LiCl-
Solution at Solar Evaporator Heating
Won, Seung-Ho ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 87~94
In this paper, with water-LiCl-
mixture which utilizes solar energy at the evaporator heat source, a thermodynamic analysis was performed to provide design data for a double-effect absorption heating system. A comparative study of the water-LiCl-
mixture against the water-LiBr pair was conducted by a computer simulation. The computer simulation is based on mass, material and heat balance equations for each part of the system. Coefficients of performance and flow ratios for effects of different operating temperatures are investigated. It is found that the heating COP is higher for the water-LiCl-
mixture than for the water-LiBr pair, and FR is lower for the former.
A Detailed Survey of Solar Energy Resources in East-North Asia Areas Using a Satellite (Focused on the Analysis of Chinese Areas)
Jo, Dok-Ki ; Kang, Young-Heack ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 95~105
Since the solar radiation is the main input for sizing any solar photovoltaic system, it will be necessary to understand and evaluate the solar radiation data. The works presented here is the analysis of solar radiation data for East-North Asia areas. The data utilized in the analysis consist of the global radiation on horizontal surface, measured at 2 different stations during 3 years for the period from 2002 to 2004 and estimated using satellite at 27 different stations over the China and Mongolia. Also the measured data has been collected at 16 different stations all of the South Korea and estimated using satellite at 12 different stations over the North Korea from 1982 to 2005. The Result of analysis shows that the annual-average daily global radiation on the horizontal surface is
. We conclude, based on the analysis, that East-North Asia areas have sufficient solar energy resources for the photovoltaic power generation system.
The Study on Optimum Installation angle of Photovoltaic Arrays using the Expert System
Yu, Gwon-Jong ; Lee, Yo-Han ; So, Jung-Hun ; Seong, Se-Jin ; Yu, Byung-Gyu ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 107~115
The measured solar radiation incident on tilted surfaces has been widely used as important solar radiation data in installing photovoltaic arrays. To optimize the incident solar radiation, the slope, that is the angle between the plane surface in question and the horizontal, and the solar azimuth angles are needed for these solar photovoltaic systems. This is because the performance of the solar photovoltaic systems is much affected by angle and direction of incident rays. The expert system can predict the optimum installation angle of photovoltaic arrays with those factors.
A Performance Prediction of a Vertical-type Geothermal Heat Exchanger by CFD Analysis
Woo, Sang-Woo ; Hwang, Kwang-Il ; Kim, Jong-Hun ; Shin, Seung-Ho ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 117~125
This study proposes a CFD(Computational Fluid Dynamics) analysis as a method of verification of the designed-data and a supplement of the insufficient experiences in geothermal system, which shows a rapid growth among the renewable energies. The followings are the results. FLUENT 6.2.12 is used as a CFD tool on this study, with the equations of continuity, motion, energy for unsteady flow through pipes and k-epsilon turbulent model. S-type model which has one borehole with diameter 12m by depth 206m and T-type model which has 3 boreholes with
are proposed, and also the boundary conditions are described. The temperature differences between temperatures by CFD analysis and by on-site measurement are less than 1.5%, this shows a high reliability of CFD analysis process which this study proposes. After 11 days simulation operated 12 hours interval On/Off mode, it is clearly predicted that the outlet temperatures of geothermal pipes are increased by
after 4 months. And the outlet temperatures of geothermal pipes increased with increase of the mass flow rates through the pipes. T-type model shows that the 4m distance between boreholes are reasonable because the temperatures at 2m and 6m from boreholes are nearly same.
A Study on Design Techniques and Effectiveness in Energy Saving of Occupied Zone in UFAD System
Yu, Ki-Hyung ; Song, Kyoo-Dong ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 127~133
Underfloor air distribution system is generally known to be more energy-saving and provide more comfort as compared with overhead air distribution system. In practice, however, some buildings to which underfloor air distribution system is applied have less effectiveness in saving energy and are getting dissatisfaction with cold draft caused by wind velocity of air distribution in terms of comfort. It is judged that such problems are due to failure to consider properties of underfloor air distribution system in applying it and identical design with the design standards for the existing overhead air distribution system. This study aims at introducing an air conditioning type of the occupied zone for underfloor all distribution system to see its effectiveness in saving energy for air conditioning of the occupied zone through a comparative simulation with the existing air conditioning type.
Hydrologic Performance Characteristics of Small Scale Hydro Power Site
Park, Wan-Soon ; Lee, Chul-Hyung ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 135~142
The model to predict flow duration characteristics and performance for small scale hydro power(SSHP) plants is studied to analyze the effects of rainfall condition. One existing SSHP plant was selected and performance characteristics was analyzed by using the developed model. The predicted results from the model developed show that the data were in good agreement with operational results of existing SSHP plant. The results show that both the scale parameter and the shape parameter have large effects on the performance of SSHP sites. And also it was found that the model developed in this study can be a useful tool to predict the performance of SSHP sites.
Numerical Study on the Flow Characteristics of Flat-Plate Solar Collector with Riser Number
Kim, Jeong-Bae ; Lee, Dong-Won ; Baek, Nam-Choon ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 143~148
It is essential to know the flow characteristics at the risers of Flat-plate solar collector for optimum design. For flat-plate solar collector, it is difficult to experimentally study the effect for the number of riser in the collector for the economic problem. So, this study was performed to show the flow characteristics of flat-plate solar collector with the number of riser using commercial code FLUENT 6.0. The base collector size is chosen with
as 1m by 2m in this study, the mass flow rate was estimated 0.04 kg/s using the mass flow rate of 0.02 kg/s per collector area for the certificate test. The number of riser is selected 4, 6, 8, 10, 12, and 14. Through the simulation, the conditions with the risers of 10 or 12 is shown as the optimum design conditions for conventional flat-plate solar collector considering lower pressure drop and more uniformly distributed mass flow rate for higher heat transfer rate without considering heat transfer.
Numerical Study on Thermal Characteristics at Absorber Plate of Flat-Plate Solar Collector with Single Riser
Kim, Jeong-Bae ; Lee, Dong-Won ; Baek, Nam-Choon ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 149~154
It is essential to know the heat transfer characteristics at the absorber plate of Flat-plate solar collector for optimum design. For flat-plate solar collector, it is difficult to experimentally study the effect for the Reynolds number of riser considering low mass flow rate being applied into the collector with one riser tube. So, this study were performed to show the heat transfer characteristics of flat-plate solar collector with single absorber plate and riser for various Reynolds number at riser using commercial code FLUENT 6.0. The base collector size is chosen with
as 0.2m by 2m with single riser in this study, Reynolds number at riser is from 200 to 1200 including about 530 at typical flat-plate collector with 10 risers considering the mass flow rate of 0.02kg/s per collector area for the certificate test Through the simulation, the results were presented as the temperature distribution at the absorber plate for various flow rate and solar irradiance conditions, then showed the effective length scale of the absorber plate The real solar irradiation condition is assumed as the constant heat flux condition of
considering the annual average solar irradiance in Korea.
Thermal Characteristics of Domestic Solar Collector for Low-Temperature Applications
Kim, Jeong-Bae ; Rhie, Soon-Myeong ; Yoon, Eung-Sang ; Lee, Jin-Kook ; Joo, Moon-Chang ; Lee, Dong-Won ; Kwak, Hee-Youl ; Baek, Nam-Choon ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 155~160
This study shows the results on thermal performance test with domestic solar collector for low-temperature applications using KS, then reveals the efficiency difference between KS and EN standard. Using the test results, this study Presents the status of thermal performance with domestic solar collector including flat-plate, single evacuated, and double evacuated (with mirror or U-tube) solar collector.
Energy Performance Evaluation of Zero Energy Technologies for Zero Energy Multi-House
Yoon, Jong-Ho ; Kim, Byoung-Soo ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 161~167
Zero Energy Multi-House(ZeMH) signifies a residential building which can be self sufficient with just new and renewable energy resources without the aid of any existing fossil fuel. For success of ZeMH, various innovative energy technologies Including passive and active systems should be well integrated with a systematic design approach. The first step for ZeMH is definitely to minimize the conventional heating and cooling loads over 50% with major energy conservation measure and passive solar features which are mainly related to building design components such as super-insulation, super window, including infiltration and ventilation issues. The purpose of this study is to analyze the thermal effect of various building design components in the early design of ZeMH. The process of the study is presented in the following. 1) selection reference model for simulation 2) verification of reference model with computer simulation program(ESP-r 9.0). 3) analysis of effect according to insulation-thickness, kinds of windows, rate of infiltration. and The simulation results indicate that almost 50% savings of conventional heating load in multi-house can be achieved with the optimum design of building components such as super insulation, super window, infiltration, ventilation.
Experimental Study on the Combined Effect of Power and Heat according to the Ventilation of Back Side in Roof Integrated PV System
Yoon, Jong-Ho ; Han, Kyu-Bok ; An, Young-Sub ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 169~174
Building integrated photovoltaic(BIPV) system operates as a multi-functional building construction material. They not only produce electricity, but also are building integral components such as facade, roof, window and shading device. As PV modules function like building envelope in BIPV, combined thermal and PV performance should be simultaneously evaluated. This study is to establish basic Information for designing effective BIPV by discovering relations between temperature and generation capability through experiment when the PV module is used as roof material for houses. To do so, we established 3kW full scale mock-up model with real size house and attached an PV array by cutting in half. This is to assess temperature influence depending on whether there is a ventilation on the rear side of PV module or not.
Experimental Study on Performances and Economic Evaluations of the Qualify of the Material for Light Path
Pak, Ee-Tong ; Lee, Kang-Ju ; Park, Hae-Sung ;
Journal of the Korean Solar Energy Society, volume 27, issue 3, 2007, Pages 175~179
This experimental demonstration has successfully shown that it is possible to use direct sunlight for the illumination of deeper building zones using the material for light path system(light duct). Three kinds of reflectors which were 95% Silver vaporizing fixed, 85% Anodized and 85% Hot melted applied to evaluate and compare their performances each others. Also, these three kind of reflectors were compared in view point of economics. The most high performance was obtained in 95% Silver vaporizing fixed reflector hater than another reflectors of 85% Anodized reflector and 85% Hot melted reflector even though more high production cost in 95% Silver vaporizing fixed reflector. The rest two reflectors of 85% Anodized and 85% Hot melted
less performance than 95% Silver vaporizing fixed reflector but their production cost were low than the production cost of 95% Silver vaporizing fixed reflector which identified very weak and light yellow color in the light.