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예측 시뮬레이션 프로그램을 이용한 이상 밀폐 열사이펀 분석
최동녁(Dongnyeok Choi),윤경은(Kyungeun Yoon),전재영(Jaeyoung Jeon),황원기(Won-Ki Hwang),이권영(Kwon-Yeong Lee) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
A two-phase closed thermosyphon (TPCT) is a closed tube which transfers heat by phase changes of working fluid. In this paper, a simulation program is investigated to design TPCT, and de-ionized water is used as a working fluid. The simulation program implemented with MATLAB, and it is evaluated by Kamyar’s (2013) research. The simulation results are presented, which show temperature distribution, boiling and condensation heat transfer coefficient, and total thermal resistance considering de-ionized water as a working fluid. The temperature error between experimental and simulation results were 27%, 14%, 6% on each of evaporator, adiabatic, and condenser of TPCT. Heat transfer coefficients of simulation results were two times bigger than the experimental results. So total thermal resistance of simulation results were two times smaller than experimental results. This simulation program will be used to design and predict the performance of the new TPCT. This new designed TPCT is made of copper tube and its inside and outside diameter are 10.9 mm, and 12.7 mm each. It consists of three parts, evaporator, adiabatic, condenser and its length are 800 mm, 200 mm, and 400 mm each. The input heat transfer rates are 100 W to 5000 W. Later, this simulation program will be developed reflecting the characteristics of various working fluids.
차량용 램프 내열 예측 프로그램 개발을 위한 실험장치 설계
김보현(Bohyeon Kim),최서영(Seoyoung Choi),최동녁(Dongnyeok Choi),김영완(Young Wan Kim),최승(Seung Choi),박유라(Yu Ra Park),이진구(Jin Goo Lee),이권영(Kwon-Yeong Lee) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
The heat from bulbs of automotive lamp is transferred to internal materials in the form of conduction, convection and radiation. The transferred heat causes deformation of lamp materials when it exceeds the heat-resistance limits. To reduce the effort from trial and error by failing the heat-resistance test after designing and producing lamps, using a simulation program is necessary at the design stage. A new internal heat-resistance prediction program with less errors is going to be developed, which covers conduction, convection and radiation based on experiments. The experimental facility is designed, according to variables we set, such as bulb powers, heat-resistant distance, boundary conditions, etc. By performing several preliminary tests, the operation of the facility was verified.
차량용 램프 내열 예측 프로그램 개발을 위한 열전달 실험
이재진(Jae-jin Lee),지은찬(Eunchan Ji),우지호(Jiho Woo),최동녁(Dongnyeok Choi),김영완(Youngwan Kim),최승(Seung Choi),박유라(Yura Park),이진구(Jingoo Lee),이권영(Kwon-Yeong Lee) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
The heat from bulbs of automotive lamp is transferred to internal materials in the form of conduction, convection and radiation. The transferred heat causes deformation of lamp materials when it exceeds the heat-resistance limits. To reduce the effort from trial and error by failing the heat-resistance test after designing and producing lamps, using a simulation program is necessary at the design stage. A new in-house heat-resistance prediction program with less errors is going to be developed, which covers conduction, convection and radiation based on experiments. The experimental facility is designed, according to variables, such as bulb powers, heat-resistant distance, boundary conditions, etc. Key parameters were set to select and perform experimental cases. The surface average temperatures were calculated, and the temperature distribution patterns of each surface were found. As a result of the experiment, the temperature distribution of all data values was different at temperature, but the shape was very similar. This shows similar heat transfer patterns throughout the data. In the case of forced convection, the temperature distribution was lower depending on the atmosphere temperature, bulb distance, and box size compared to the natural convection. By securing reliable data, algorithm development and verification program based on the experiment is possible.
노후화된 대학 건물의 단열성능 향상 실험 및 경제성 평가
이정민(Jeongmin Lee),소원호(Wonho So),조경찬(Kyungchan Cho),최동녁(Dongnyeok Choi),이권영(Kwon-yeong Lee) 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.8
본 연구는 노후화된 대학 건물의 내부 단열 성능 향상에 대한 것으로, 대학교 건물 내 재실자의 생산성을 높이고 노후화된 건물의 단열효과를 높이기 위해 진행됐다. 본 논문은 한동대학교 느헤미야홀 건물 내 오피스 재실자의 단열성능 향상에 대한 지속적인 요청에 응답하여 문제해결을 위해 진행된 연구라는 차별성을 가지고 있으며, 내부온도가 인접건물의 내부온도와 비교했을 때 낮음을 확인하여 연구 필요성에 대한 타당성을 검증하였다. 학교라는 건물의 특성을 고려해 내외부 단열 중 내부 단열을 주제로 단열재를 선택했다. 대학교 교수 오피스를 소형화시킨 모형 방을 만들어 시장에서 사용되는 내부 벽면 단열재를 설치해 실험을 진행했다. 실험 결과를 바탕으로 가열 시간과 실제 열전달 계수를 측정하여 단열효과를 분석하는 경제성 평가를 실시했다. 경제성 평가는 실험과 이론에 의해, 겨울철과 여름철 기준으로 각각 실시되었다. 연구결과, 느헤미야홀 60 개의 오피스에 아이소핑크(30 T)를 내 단열재로 도입하였을 때, 한 달에 겨울철에는 최대 총 1,071,600 원을 절약 할 수 있으며, 여름철에는 총 109,200 원을 절약할 수 있다. This study examined ways of improving the internal insulation performance of aging university buildings, and to enhance the convenience of occupants in university buildings and the insulation effect of aging buildings. This research was conducted to solve the problem of continuous requests for improving the insulation performance of office workers in the Nehemiah Hall building of Handong University. The results showed that the internal temperature of Nehemiah Hall was low compared to the internal temperature of the adjacent building. Considering the characteristics of the building, the university chose insulating materials under the theme of internal insulation. The experiment was conducted by installing internal wall insulation used in the market by producing a model room that miniaturized the university professor"s office. Based on the experimental results, an economic evaluation was conducted to analyze the insulation effect by measuring the heating time and actual heat transmission coefficient. An economic evaluation was conducted by experiment and theory and on a winter and summer basis. According to the research, when an Isopink (30 T) was introduced as an internal insulation material in 60 offices of Nehemiah Hall, it could save up to 1,071,600 won in total during the winter season and 109,200 won during the summer season.