Yong Heak Kang

Yong Heak Kang

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153
Publications
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Publications

Publications (153)
Article
Full-text available
With the accelerated development of science and technology across fields, publications in almost all fields have increased exponentially every year. According to the Scopus search, the number of papers related to buildings and solar energy that used machine learning has grown at an average annual rate of 16.1%, exceeding 3000 publications since 201...
Article
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In solar resource assessment, the climatological environment of the target area is objectively quantified by the cloudiness or clear sky index, which is defined as the ratio of global horizontal irradiance to clear sky solar insolation. The clear sky model calculates incoming solar irradi-ance on the ground surface considering several atmospheric p...
Article
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With the development of solar power generation, the importance of direct normal irradiance is being emphasized. Therefore, previous studies have examined numerous separation models for calculating direct and diffuse irradiance from global horizontal irradiance. These models have recently been applied to data in 1-min units. These have more informat...
Article
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To determine the wind turbine class in the offshore of the Korean Peninsula, the reference wind speed for a 50-y return period at the hub height of a wind turbine was estimated using the reanalysis data sets. The most recent reanalysis data, ERA5, showed the highest correlation coefficient (R) of 0.82 with the wind speed measured by the Southwest o...
Article
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The Korea Institute of Energy Research builds Korean solar irradiance datasets, using gridded solar insolation estimates derived using the University of Arizona solar irradiance based on Satellite-Korea Institute of Energy Research (UASIBS-KIER) model, with the incorporation of geostationary satellites over the Korean Peninsula, from 1996 to 2019....
Article
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Solar forecasting is essential for optimizing the integration of solar photovoltaic energy into a power grid. This study presents solar forecasting models based on satellite imagery. The cloud motion vector (CMV) model is the most popular satellite-image-based solar forecasting model. However, it assumes constant cloud states, and its accuracy is,...
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Recently, satellite-derived solar irradiance data, generated by the Korea Institute of Energy Research, has been opened for public use via the Public Big Data Platform organized by the Ministry of Public Administration and Security. These data are the monthly mean of daily total irradiance for the domain with latitude between 32°N and 40°N and long...
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The concentration performance of a heliostat field consisting of hundreds to thousands of reflectors allows for a deformation-based focus deviation of only 3 mrad or less. The most problematic aspect is the wind load; hence, in this study, the extreme wind speed condition was analyzed. Preceding studies such as field experiments, wind tunnel tests,...
Article
Optimization of photovoltaic (PV) panel orientation is a significant part of economic evaluation. However, designing a PV system according to only one theoretical optimal orientation is challenging. Installing a PV panel at a specific orientation can cause low economic efficiency, depending on the features of the area. Therefore, in this study, a n...
Article
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This study aimed to reduce the equipment cost of a heliostat, a key element of tower-type concentrating solar power, by reducing its weight The wind load evaluation of the new model of heliostat, which is 50% lighter than a conventional model and has a reflector sized 16m 2 due to the adoption of a sandwich panel, was carried out using computationa...
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Day ahead forecast is necessary for the electricity market to stabilize the electricity penetration. Numerical weather prediction is usually employed to produce the solar irradiance as well as electric power forecast for longer than 12 hours forecast horizon. Korea Meteorological Administration operates the UM-LDAPS model to produce the 36 hours fo...
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Onshore wind resource maps are the primary data for wind farm site prospecting, national renewable energy supply policy and power system network design development. This study discusses appropriate service levels in terms of elements and spatiotemporal resolution in wind resource maps, with a view to improving the wind resource map service in Korea...
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Solar irradiance derived from satellite imagery is useful for solar resource assessment, as well as climate change research without spatial limitation. The University of Arizona Solar Irradiance Based on Satellite–Korea Institute of Energy Research (UASIBS-KIER) model has been updated to version 2.0 in order to employ the satellite imagery produced...
Article
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The optimum inclination angle of a solar panel is approximately 30~40 degrees in Korea, which corresponds to Korea’s latitudinal position. With such a steep angle, flow separation is inevitable when wind flows over a solar panel. The present study carried out by Large Eddy Simulations (LES) provides a stable turbulence model for separated flow simu...
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By blocking irradiance, shadows cast by high-rise buildings in urban areas can reduce the power generation efficiency of PV panels installed on low-rise buildings. As the conventionally installed PV panel is not suitable for the urban environment, which is unfavorable for power generating, a more radical solution is required. This study aims to hel...
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Solar energy does not always follow the normal distribution due to the characteristics of natural energy. The system advisor model (SAM), a well-known energy performance analysis program, analyzes exceedance probabilities by dividing solar irradiance into two cases, i.e., when normal distribution is followed, and when normal distribution is not fol...
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This study estimated the available renewable market potential based on Levelized Cost Of Electricity and then assessed the renewable derived energy self-sufficiency for the unit of local government in South Korea. To calculate energy self-sufficiency, 1 km gridded market renewable generation and local government scale of final energy consumption da...
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With the opening of the small power brokerage business market in December 2018, the small power trading market has started in Korea. Operators must submit the day-ahead estimates of power output and receive incentives based on its accuracy. Therefore, the accuracy of power generation forecasts is directly affects profits of the operators. The forec...
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This study investigates, for the purpose of fog forecasting, the impacts of topography and land use changes on the characteristics of turbulence that directly contribute to the formation and dissipation of fog off the west coast of the Korean Peninsula using the Weather Research and Forecasting model version 3.5.1. During the investigation period,...
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The proportion of solar photovoltaic power generation has steadily increased in the power trade market. Solar energy forecast is highly important for the stable trade of volatile solar energy in the existing power trade market, and it is necessary to identify accurately any forecast error according to the forecast lead time. This paper analyzes the...
Article
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Although the size of the wind turbine has become larger to improve the economic feasibility of wind power generation, whether increases in rotor diameter and hub height always lead to the optimization of energy cost remains to be seen. This paper proposes an algorithm that calculates the optimized hub height to minimize the cost of energy (COE) usi...
Conference Paper
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The renewable energy potentials for the country are very important information for the national renewable energy policy and decision-making. This study investigated the technic-economic potential on the solar thermal technology, three different absorbers (compound parabolic collector, linear Fresnel collector and parabolic trough collector) in Sout...
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The reliable Typical Meteorological Year (TMY) data, sometimes called Test Reference Year (TRY) data, are necessary in the feasibility study of renewable energy installation as well as zero energy building. In Korea, there are available TMY data; TMY from Korea Institute of Energy Research (KIER), TRY from the Korean Solar Energy Society (KSES) and...
Article
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Clear sky indices were estimated by various ways based on in-situ observation and satellite-derived solar irradiance. In principle, clear sky index defined by clear sky solar irradiance indicates the impacts of cloud on the incoming solar irradiance. However, clear sky index widely used in energy sciences is formulated by extraterrestrial irradianc...
Article
Full-text available
Daily ahead forecast is necessary for the electricity balance between load and supply due to the variability renewable energy. Numerical weather prediction is usually employed to produce the solar irradiance as well as electric power forecast for more than 12 hours forecast horizon. UM-LDAPS model is the numerical weather prediction operated by Kor...
Article
Full-text available
Since Ulleungdo, which is a steep complex terrain island, has very strong local wind characteristics, the validity of surface observation data should be evaluated first when applying surface observation data to wind resource assessment. In this paper, the local meteorological representations of surface observation data were evaluated by analyzing t...
Conference Paper
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Daejeon Metropolitan City and the Korea Institute of Energy Research (KIER) have developed a platform with the Solar Energy Estimator for Daejeon (SEED) for Daejeon citizens and solar power generation companies according to the government plan to expand new and renewable energy. Developed through four phases, the platform can calculate the solar ir...
Article
Solar resource assessment is carried out in a feasibility study using reliable meteorological elements including solar irradiance. In concentrating solar power plants, the direct normal irradiance is the key variable in the system operation. However, direct normal irradiance is rarely measured as compared to global horizontal irradiance. There are...
Article
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Typical Meteorological Year Dataset is necessary for the renewable energy feasibility study. Since National Renewable Energy Laboratory has been built Typical Meteorological Year Dataset in 1978, gridded datasets taken from numerical weather prediction or satellite imagery are employed to produce Typical Meteorological Year Dataset. In general, Typ...
Article
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For the preliminary step for estimating the performance of roof-type photovoltaic system in urban areas, we analyzed the solar radiation reduction ratio by shadow effect by buildings using DSM (Digital Surface Model) and GIS (Geographical Information System) tools. An average loss by the shadow is about 19% in Seoul. The result was related to the b...
Article
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The nationwide mid-sized basin unit technical small hydropower potential is estimated using the gridded flow accumulative model using the digital elevation model has 30 m resolution and the areal rainfall in the basins. The rainfall data was reconstructed to the same resolution of the digital elevation model using 10 years averaged rainfall data of...
Article
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This study evaluated the applicability of long-term datasets among third-generation reanalysis data CFSR, ERA-Interim, MERRA, and MERRA-2 to determine which dataset is more suitable when performing wind resource assessment for the ‘Southwest 2.5 GW Offshore Wind Power Project’, which is currently underway strategically in South Korea. The evaluatio...
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This paper reviews the history and status of wind energy in South Korea using the wind power generation statistics (2002∼2016) provided by the Electric Power Statistics Information System (EPSIS) and “2015 Renewable Energy Supply Statistics” from the Ministry of Trade, Industry, and Energy. In addition, the prediction accuracy of the Korea wind res...
Article
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Wind power forecasting is a key role for large-scale wind power penetration on conventional electric power systems by understanding stochastic nature of winds. This paper proposes an empirical statistical model for forecasting monthly offshore wind speeds as a function of remotely sensed sea surface temperatures over the seas around the Korean Peni...
Article
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This study introduces the University of Arizona Solar Irradiance Based on Satellite/Korea Institute of Energy Research, which is usually called UASIBS/KIER model. Then the evaluation of modeling performance is done against the ground observations for the instantaneous, hourly, and daily time scales over the Korean Peninsula in this study. The relat...
Conference Paper
A solar reactor containing a CeO2-coated reactive foam device for producing hydrogen via a thermochemical two-step water splitting cycle was proposed and experimentally tested. Modeling of the optical properties of the 40 kWth KIER (Korea Institute of Energy Research) solar furnace was performed to design and prepare the optimized foam matrix shape...
Conference Paper
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The South Korean government has been started monitoring and reassessment for new and renewable resource under greenhouse reduction related with the climate agreement in Paris. This study investigated characteristics of the model-derived direct normal irradiance(DNI) using ten-minute data of the Weather Research and Forecasting(WRF) model with 1 km...
Article
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Despite the excellency of unsteady flow simulation around urban building forest, Large Eddy Simulation (LES) is still a heavy tool due to computation time bottleneck. This paper introduces a simple wind resource assessment method by reducing number of LES simulation cases using geometrical symmetry of a building complex. As a demonstration case, wi...
Article
In South Korea, where 64% of the national territory is mountainous, good wind resources in inland areas are mostly situated in high mountain regions. To develop a wind farm in a mountain region, the sloping of mountains and their shielding from wind by the surrounding topology should be considered. It is generally most advantageous to install wind...
Article
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Wind resource potential is calculated by multiplying an area where a wind farm can be developed by wind turbine capacity density. Therefore, the wind turbine capacity density of wind farms in Korea must be calculated precisely first, in order to accurately calculate wind resource potential in Korea. In the present study, of the 67 total wind farms...
Article
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Satellite-derived solar irradiance was evaluated against four ground observations for clear and cloudy skies. The solar irradiance estimated by the CLAVR-x model was positively biased for clear sky and the error metrics increased when clouds exist. The COMS operational products include the solar insolation, which is underestimated when comparing wi...
Article
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Combustible waste can provide the energy required for industrial production activity or home life, and generally be classified as waste solid fuel (SRF : Sold Refuse Fuel), pyrolytic fuel oil of polymer wastes, gasification fuel of combustible wastes, and incineration heat, etc. This study examined the energy potential for domestic waste based on t...
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Improvement of a simple and practical Ensemble Prediction System (EPS) based on multi-models for wind power forecasting was performed by optimizing ensemble member combinations. Three types of ensemble methods have been compared; multi-models, multi-physics and hybrid ensemble. Multi-models were composed of four different numerical weather predicti...
Article
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For accurate wind resource assessment and wind turbine performance test, it is essential to secure wind data covering a rotor plane of wind turbine including a hub height. In general, we can depict wind speed profile by extrapolating or interpolating the wind speed data measured from a meteorological tower where multiple anemometers are mounted at...
Article
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The Korea Institute of Energy Research (KIER) provides the web service of the New-Renewable Energy Resource Map (www.kier-atlas.org), which offers comprehensive information for new-renewable energy resource assessment based on the Geographical Information System (GIS). In order to shift a development framework of map content from supply-push to dem...
Article
In 2011, the first Korean central-receiver solar thermal power plant targeting the generation of 200 kWe was developed as a government research project. The project motivated us to develop an optical modeling program using the Monte Carlo ray-tracing method so that we are able to analyze performances of the solar concentration system in detailed an...
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A simple but practical Ensemble Prediction System(EPS) for wind power forecasting was developed and evaluated using the measurement of the offshore meteorological tower, HeMOSU-1(Herald of Meteorological and Oceanographic Special Unite-1) installed at the Southwest Offshore in South Korea. The EPS developed by the Korea Institute of Energy Research...
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How effectively a wind farm captures high market prices can greatly influence a wind farm’s viability. This research identifies and creates an understanding of the effects that result in various capture prices (average revenue earned per unit of generation) that can be seen among different wind farms, in the current and future competitive SMP (Syst...
Article
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The local wind systems in the Pohang region were categorized into wind sectors. Still, thorough knowledge of wind resource assessment, wind environment analysis, and atmospheric environmental impact assessment was required since the region has outstanding wind resources, it is located on the path of typhoon, and it has large-scale atmospheric pollu...