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초소수성 특성을 갖는 다중 구리관의 응축 열전달에 관한 시각화 실험 연구
류한솔(Han Sol Ryu),이민형(Min Hyung Lee),신영훈(Young Hun Shin),이권영(Kwon Young Lee),황운봉(Un Bong Hwang) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
The purpose of this research is to improve the condensation heat transfer performance for improving the efficiency of the condenser. And the research for the improvement of condensation heat transfer performance was conducted by using the hydrophobic coated tubes. In this research, a thermoelectric device called Thermal Electric Cooler (TEC) was used to solve the complexity and the size of the experimental devices, which are the problems of the existing research. The research on the hydrophobic multi-tube and the droplet behavior between the tubes, which were not conducted in the previous research, was conducted. And the heat transfer coefficient and the droplet behavior of hydrophobic tubes was analyzed and compared with those of the bare copper tubes. As a result of the analysis, it can be seen that the hydrophobic coated tube has better heat transfer performance than the bare copper tube. It is predicted that the use of superhydrophobic will solve the energy efficiency problem.
초소수성 특성을 갖는 다중 구리관의 응축 열전달에 관한 시각화 실험 연구
류한솔(Han Sol Ryu),이민형(Min Hyung Lee),신영훈(Young Hun Shin),이권영(Kwon Young Lee),황운봉(Un Bong Hwang) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
The purpose of this research is to improve the condensation heat transfer performance for improving the efficiency of the condenser. And the research for the improvement of condensation heat transfer performance was conducted by using the hydrophobic coated tubes. In this research, a thermoelectric device called Thermal Electric Cooler (TEC) was used to solve the complexity and the size of the experimental devices, which are the problems of the existing research. The research on the hydrophobic multi-tube and the droplet behavior between the tubes, which were not conducted in the previous research, was conducted. And the heat transfer coefficient and the droplet behavior of hydrophobic tubes was analyzed and compared with those of the bare copper tubes. As a result of the analysis, it can be seen that the hydrophobic coated tube has better heat transfer performance than the bare copper tube. It is predicted that the use of superhydrophobic will solve the energy efficiency problem.
초소수성 특성을 갖는 다중 구리관의 응축 열전달에 관한 시각화 실험 연구
류한솔(Han Sol Ryu),이민형(Min Hyung Lee),신영훈(Young Hun Shin),이권영(Kwon Young Lee),황운봉(Un Bong Hwang) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
The purpose of this research is to improve the condensation heat transfer performance for improving the efficiency of the condenser. And the research for the improvement of condensation heat transfer performance was conducted by using the hydrophobic coated tubes. In this research, a thermoelectric device called Thermal Electric Cooler (TEC) was used to solve the complexity and the size of the experimental devices, which are the problems of the existing research. The research on the hydrophobic multi-tube and the droplet behavior between the tubes, which were not conducted in the previous research, was conducted. And the heat transfer coefficient and the droplet behavior of hydrophobic tubes was analyzed and compared with those of the bare copper tubes. As a result of the analysis, it can be seen that the hydrophobic coated tube has better heat transfer performance than the bare copper tube. It is predicted that the use of superhydrophobic will solve the energy efficiency problem.
수직 지면 반력 데이터와 탄성각 보행 모델 시뮬레이션을 이용한 수평 지면 반력 추정
류한솔(Hansol Ryu),박수경(Sukyung Park) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Several studies suggested portable systems that measure horizontal and vertical ground reaction force (GRF) during walking. However, systems that could measure horizontal GRF usually have larger sensing modules than systems that only measure vertical GRF. Using larger sensing modules, the system weight and height, and altered shoe stiffness may affect gait behaviors. We suggest methodology for estimating horizontal GRF from measured vertical GRF data. Compliant leg model simulation was employed to relate vertical and horizontal component of GRF during walking. Initial conditions and model parameters are selected to minimize the difference between simulated and measured vertical GRF. Our method predicted horizontal GRF with average root mean square error less than 10% and correlation coefficient higher than 0.95 compared with measured GRF data. The proposed method might be applied to develop simple GRF sensing systems with less effect on natural walking.