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노즐의 면적비를 고려한 충돌제트 열전달 최적 조건에 관한 연구
여성구(Seong Gu Yeo),김은지(Eun Ji Kim),안영철(Young Chull Ahn) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.11
The aim of this study is to find the optimum condition of the impinging jet heat transfer considering the aspect ratio of the nozzle. The experiment was carried out inside the chamber at –18℃, and an ice tray, not a hot plate, was installed as the target surface. The aspect ratio of the nozzles was set from 1 to 3, and the cases were classified into two types. The air volume was set to 8.82 ㎥/h in all cases, the nozzle area was set based on the tray widths of 5㎝ and 7㎝, and the area was gradually reduced. In case 1, the ice-making time was fastest when the aspcet ratio was 2. In Case 2, the ice-making time was fastest when the aspect ratio was 2.
탄산음료에서 배출되는 이산화탄소가 지구온난화에 끼치는 영향 연구
여성구(Seong Gu Yeo),김은지(Eun Ji Kim),심재룡(Jae Ryong Sim),이승윤(Seung Yun Lee),강수진(Su Jin Kang),안영철(Young Chull Ahn) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.6
This study shows the effect of carbon dioxide emitted from carbonated beverages on global warming in comparison with the amount of carbon dioxide saving of new renewable energy. On the basis of 2005, our government hope to decrease carbon dioxide emissions by 2030, 37%. Carbon dioxide emissions were calculated by domestic and overseas carbonated beverages consumption and the amount of carbon dioxide contained in beverages. The calculated carbon dioxide emissions were compared to the carbon dioxide saving of new renewable energy. The ratio of carbon dioxide in the carbonated beverages is about 4.745% domestic and 0.0097% overseas. The domestic carbon dioxide ratio is compared with solar power generation.
태양광열 · 지열 하이브리드 시스템의 적정 용량 설계를 위한 동적 에너지 시뮬레이션
정용대(Jeong, Yong-Dae),남유진(Nam, Yujin),여성구(Yeo, Seong-gu) 대한건축학회 2017 大韓建築學會論文集 : 構造系 Vol.33 No.7
Recently, the ground source heat pump (GSHP) system is actively used because it has high performance of system comparing with other conventional systems. However, the systemic performance can decrease due to excessive and prolonged operation periods. This problem can be solved by combining with other heat source systems. In this research, a hybrid system with GSHP and PVT (Photovoltaic-Thermal) system was proposed and the analysis of system performance was conducted. The analysis model was made by TRNSTS17 and annual performance was calculated based on hourly system performance and weather data. In this paper, in order to decide suitable system capacity between GSHP and PVT, case studies was conducted according to the capacity change of individual system. The simulation was carried out considering various building conditions and local conditions. In the results, a hybrid system can achieve 15.5% higher performance at most than only GSHP system.
경보방식에 따른 고층건축물의 효율적 피난방안에 관한 연구
김은지(Eun Ji Kim),유동균(Dong Kyun You),여성구(Seong Gu Yeo),안영철(Young Chull Ahn) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.6
When a fire occurs in a high-rise building, it leads to a large-scale evacuation, and evacuees escape through staircases at the same time. This leads to congestion in the staircases, resulting in stagnation of the evacuation. In this study, evacuation scenarios were classified into three types in order to analyze the evacuation efficiency according to the difference of the alert method. The study applied alert method that simultaneously alerts all floors of buildings, priority alert method that gives priority alert to the ignition layer and four layers directly above it and newly applied the alert method(Hereinafter referred to as “cross alert method”) of issuing the intersection priority alert for every certain number of floors. In addition, the most effective time difference was obtained by analyzing the evacuation simulation results in the case of the priority and the cross alert method. As a result, alert at once was the fastest alert method in spite of the largest number of congestion times, followed by the cross alert method and the priority alert method. In the priority and the cross alert method, the evacuation started late due to the difference of the alert time, the final evacuation time was further delayed.