Yongin si, South Korea
Yongin si, South Korea

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Oh M.-W.,Korea Electrotechnology Research Institute | Kang T.-G.,Korea Energy Management Corporation | Ryu B.,Korea Electrotechnology Research Institute | Lee J.E.,Korea Electrotechnology Research Institute | And 5 more authors.
Journal of Korean Institute of Metals and Materials | Year: 2014

Electronic structures and X-ray absorption spectra of rutile TiO2were obtained with the firstprinciples calculation. Density of states, charge density and differential charge density were obtained, from which charge transfer characteristics between Ti and 0 was well confirmed. Direct and indirect band gap of 1.99 and 2.03 eV were evaluated, respectively. X-ray absorption spectra of rutile TiO2was also calculated, in which the gap between main peaks was comparable with experiment. From band structure calculations, anisotropic electrical transport properties were expected, which was in good agreement with experiment. © The Korean Institute of Metals and Materials.


Lee W.-N.,Konkuk University | Kim H.-J.,Korea Energy Management Corporation | Park J.-B.,Konkuk University | Cho K.-S.,Korea Electrotechnology Research Institute | And 2 more authors.
Renewable and Sustainable Energy Reviews | Year: 2012

Energy flow from the primary energy to the final energy use varies depending on which device is used for the heating and cooling energy service. This paper presents economic analyses of medium capacity space heating and cooling systems from three perspectives - primary energy, final consumer, and social cost perspective. From the analysis results of primary energy and final consumer perspective, electric heat pump (EHP) system is found to be superior to the gas engine driven heat pump (GHP) system for the energy consumption and cost-effectiveness due to its higher system efficiency. However, the result of social cost perspective shows the GHP system is superior to the EHP system considering incurred incremental electricity generation capacity construction cost and avoided gas storage tank construction cost due to a new installation of each system. And this paper suggests three analysis methodologies - the primary energy, final consumer, and social cost perspective - can be used for developing various measures and policies for integrated demand side management. © 2012 Elsevier Ltd. All right reserved.


Jeon K.,Korea Automotive Technology Institute | Yoo Y.,Korea Automotive Technology Institute | Lee J.,Korea Automotive Technology Institute | Jung D.,Korea Automotive Technology Institute | And 2 more authors.
28th International Electric Vehicle Symposium and Exhibition 2015, EVS 2015 | Year: 2015

Korea and EU governments are running the tyre labelling system from 2012. All tyres sold in Korea have to carry a label displaying information about two performance criteria such as rolling resistance and wet grip. The rolling resistance of tyres determines their fuel efficiency grading and the wet grip of tyres determines their braking safety grading. Measurement of rolling resistance and wet grip must be reproducible; tests on the same tyres in different laboratories must produce the same results in order to ensure a fair comparison between tyres from different suppliers. In addition, a good reproducibility of testing results prevents market surveillance authorities from obtaining different results from those of the suppliers when testing the same tyres. The laboratory alignment procedure of rolling resistance was developed and published as an EU Commission Regulation No. 1235 in 2011. But the laboratory alignment procedure of wet grip has not developed yet. So there are a lot of differences of wet grip test results among the test laboratories in the world. The proposed new procedure for the alignment of test laboratories with regard to the measurement of tyre wet grip can improve the reproducibility of the wet grip testing results. The proposed wet grip laboratory alignment procedure was verified through five laboratory alignment tests between KATECH and five test laboratories in the world.


Cho S.-H.,Jeonju University | Kim H.-J.,Korea Energy Management Corporation | Zaheeruddin M.,Concordia University at Montréal
Building Services Engineering Research and Technology | Year: 2011

Because of the rapid rise in ambient temperatures in urban cities due to global warming, this research study was conducted to revise the heating degree days (HDDs) for main cities of South Korea. Current HDDs used in the design of heating systems were established some 30 years ago. Therefore, there is a need to revisit and revise the HDDs used in Korea. The HDDs were computed at five different indoor set-point and unloaded temperatures. The validity of the methodology used for computing HDDs was ascertained by comparing the calculated HDDs with the published values. The impact of the length of time on total annual HDDs was examined. The results show that higher temperature trends due to global warming witnessed over the past decade in general decreased the HDDs. The impact was higher for warmer climate cities than the cold regions. The revised annual HDDs for 15 major cities of South Korea are presented in this paper.Practical applications: The HDDs corrected for global warming effects for 15 major cities of South Korea presented in this article are useful for designers in estimating the impact on equipment size and energy consumption. Towards this end, several scenarios of global warming effects are presented by assuming several unloaded temperature levels. This is useful for the designers in examining the uncertainties in the estimation of energy consumption. The results published are also important for policy makers in South Korea to examine the need for revising the degree day database in light of the global warming trends. © The Chartered Institution of Building Services Engineers 2011.


Kwak H.-Y.,Chung - Ang University | You Y.,Blue Economy Strategy Institute | Oh S.-D.,Blue Economy Strategy Institute | Jang H.-N.,Korea Energy Management Corporation
International Journal of Energy Research | Year: 2014

A thermoeconomic analysis of a ground-source heat pump (GSHP) system with a vertical or horizontal ground heat exchanger, a type of heat delivery system, was performed using the modified productive structure analysis method. In this analysis, the unit cost of geothermal heat delivered to a room using GSHP system was estimated. The unit cost of heat delivered was calculated to be $0.063/kWh for input of electricity with a unit cost of $0.140/kWh for a GSHP with a coefficient of performance (COP) of 3.27. Exergy destruction and monetary losses due to the irreversibility that occurs at each component of the system were also estimated. The unit cost of heat was found to be inversely proportional to the COP of the heat pump and proportional to the electricity input. The greatest monetary loss occurs in the geothermal heat exchanger in which considerable mass of brine flows in long pipes and in the fan-coil unit which features a complex configuration of pipes in the air passages, respectively. © 2013 John Wiley & Sons, Ltd.


Song B.J.,Korea Research Institute of Chemical Technology | Song B.J.,Sungkyunkwan University | You N.,Korea Research Institute of Chemical Technology | Lee J.H.,Korea Research Institute of Chemical Technology | And 2 more authors.
Applied Chemistry for Engineering | Year: 2014

SAGD (steam assisted gravity drainage) process is the most commonly used in-situ technology for the recovery of bitumen from oil sand. It was investigated that the effects of different additives on bitumen recovery rate from oil sand in SAGD process among many possible mechanisms studied throughout the study. Bitumen recovery from thin layer oil sand reservoirs was simulated by using an experimental SAGD apparatus with scale of 150:1. To improve the simulation accuracy of thin layer oil reservoir, we have attached geological model (GM). Oil sand was simulated by using a mixture of extra heavy oil and glass beads with a diameter of 1.5 mm. CO2 was used as an additive and the evolution of steam chambers were closely monitored, and the effects of CO2 as an additive was investigated. Two types of injection methods were tested; continuous (cCO2-SAGD) and sequential interruption (sCO2-SAGD) CO2 injection. For the sCO2-SAGD experiment, it was observed that the recovery rates and CSOR were efficiently improved control experiment from 60.2% to 69.3% and 7.1 to 6.0, respectively, whereas cCO2-SAGD experiment decreased from 60.2% to 57.6% and 7.1 to 7.3. © 2014 The Korean Society of Industrial and Engineering Chemistry. All rights reserved.


Oh S.-D.,Blue Economy Strategy Institute | Yoo Y.,Chung - Ang University | Song J.,Seoul National University | Song S.J.,Seoul National University | And 3 more authors.
Energy and Buildings | Year: 2014

Public buildings in Korea have an obligation to supply 10% of the total energy consumption from new and renewable energy sources, which requires proper tools for installation of the energy systems. In this study, a cost-effective method for integration of existing grids with new and renewable energy sources in public buildings in Korea is suggested. A key factor of the method is based on the fact that the unit costs of the products from the energy systems depends on the capacity factor or the utilization factor which is crucially dependent on the interaction between the energy demand pattern for the building and the production time of the specific energy from the new and renewable energy sources. For several public buildings such as two business buildings located at quite different weather conditions, a welfare center and a fire station at different locations, the proper combination of new and renewable energy sources is suggested by detailed numerical calculation based on the hourly energy demand pattern data obtained from field studies for the buildings to minimize the additional cost by installing the energy systems. © 2014 Elsevier B.V. All rights reserved.

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