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최동녁(Dong-Nyeok Choi),유재영(Jae-Young Yu),권장상(Jang-Sang Kwon),이우빈(U-Bin Lee),피경진(Kyeong-Jin Pi),손창현(Chang-Hyun Son),이재영(Jaeyoung Lee),이권영(Kwon-Yeong Lee),성주헌(Ju-Hun Sung) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Supercritical carbon dioxide (s-CO₂) refers to carbon dioxide that has both liquid and gas properties and can be applied to a power generation system that increases efficiency of generation while reducing the size of core machines. In particular, this study was planned to consider the possibility of applying s-CO cycles to solar systems, one of the new and renewable energies that has recently been under spotlight. For this plan, we try to design and manufacture a 15 kWth small s-CO₂ cycle experimental apparatus. First, we completed to draw T-s diagram after identifying the properties of each section of the s-CO₂ Brayton cycle through the ‘REFPROP 7.0’. Based on them, we drew Flow Diagram and Heat and Mass Balance Diagram for the cycle. Requirements have been created to select the suitable devices for the small s-CO₂ cycle experimental facility.
이재진(Jae-Jin Lee),최동녁(Dong-Nyeok Choi),김영완(Young-Wan Kim),최승(Seung Choi),박유라(Yu-Ra Park),이진구(Jingoo Lee),이권영(Kwon-Yeong Lee) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
The heat generated from the heat source of an automotive headlamp, is transferred to the lamp’s reflector and lens in the form of conduction, convection and radiation. The transferred heat causes deformation of lamp’s materials when it exceeds the heat-resistance limits of its material, thus the design needs to be done in the range of the limits. In case of failing the heat-resistance test after designing and producing a headlight, the design process should start all over again, requiring a lot of time and cost. However, when the design is proceeded with the simulation results using a temperature prediction program, the time and cost spent on the production would be reduced. The previous data based program showed large errors. Accordingly, new prediction program based on three heat transfer mechanisms has to be developed, which should be similar to CFD results but fast. The Beta version was made covering for a simplified cuboid headlamp. With the help of CFD, the simulation is being updated, minimizing the difference between the result of CFD and simulation in order to get reliability.