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500W 급 마이크로 가스터빈을 위한 파형 휜을 가지는 리큐퍼레이터의 열성능 비교
도규형,김태훈,한용식,최병일,김명배,Do, Kyu Hyung,Kim, Tae Hoon,Han, Yong-Shik,Choi, Byung-Il,Kim, Myung Bae 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.6
In this study, thermal performance of recuperators with plain and offset strip fins is investigated to enhance the thermal efficiency of a micro gas turbine. Thermal cycle analysis is conducted to determine major design parameters of a single-pass counterflow recuperator. In order to evaluate the performance of the recuperator, the effectiveness and the pressure drop in the recuperators are chosen as the objective function and the design constraint, respectively. The optimized geometries for internal structure of the recuperators with plain and offset strip fins are obtained with varying the fin spacing and height. From the result, the recuperator with offset strip fins has better thermal performance when the fin spacing, s, is smaller than 1.45mm and the thermal performance of the recuperator with plain rectangular fins is higher than that with offset strip fins in the region of $s{\geq}1.45mm$. In addition, it is found that the entrance region effect and the longitudinal wall heat conduction effect should be taken into account for accurately predicting the thermal performance of the recuperators with both plain and offset strip fins.
오프셋 스트립 휜을 가지는 리큐퍼레이터의 내부 형상 최적화
도규형,한용식,최병일,김명배,Do, Kyu-Hyung,Han, Yong-Shik,Choi, Byung-Il,Kim, Myung-Bae 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.6
In the present study, a recuperator is suggested to improve the thermal efficiency of a micro gas turbine. Primary design parameters of the recuperator are determined from the ideal cycle analysis. The counter flow plate-fin heat exchanger with offset strip fins is chosen as the type of the recuperator. In order to satisfy the design constraints which are the minimum effectiveness and the maximum pressure drop, the optimization for the internal structure of the recuperator is performed with varying the fin spacing and the fin height of offset strip fins. Also the effects of the thermal conductivity of fins and separation plates and the longitudinal heat conduction on the thermal performance of the recuperator are investigated.
수직/수평 방향을 가지는 CPV 모듈 냉각용 열분산기의 열성능에 관한 연구
도규형(Do Kyu Hyung),한용식(Han Yong-Shik),최병일(Choi Byung-Il),김명배(Kim Myung-Bae),이유환(Lee Yu-Whan) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
In this paper, the thermal performance of a heat spreader for CPV(Concentrating Photovoltaic) module cooling is studied. In order to evaluate the thermal performance of the aluminum alloy heat spreader, experimental investigations are performed with varying the thickness of the heat spreader, the inclination angle, and the applied heat flux. From the experimental results, the temperature difference between the maximum temperature and the ambient temperature increases with decreasing the thickness of the heat spreader and with increasing the applied heat flux. Also, it is found that the inclination angle significantly affects the thermal performance of the heat spreader. the maximum temperature difference of the heat spreader with the horizontal orientation is much larger than that with the vertical orientation. In addition, three dimensional numerical simulations are performed using the commercial simulation tool in the present work. The experimental results are compared with the corresponding numerical results and are in close agreement with the numerical results.
플레이트-휜을 가지는 자연대류 히트싱트의 경사각 변화에 대한 실험적 연구
도규형(Kyu Hyung Do),김태훈(Tae Hoon Kim),한용식(Yong-Shik Han),최병일(Byung-Il Choi),김명배(Myung Bae Kim) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.6
본 연구에서는 등온 가열 조건 하에서 플레이트-휜을 가지는 자연대류 히트싱크의 열성능을 측정하기 위한 실험적 연구를 수행하였다. 실험은 자연대류 히트싱크의 열입력량, 휜 간격 및 높이를 변화시키면서 수행하였다. 특히, 경사각 변화가 자연대류 히트싱크의 열성능에 미치는 영향에 대해 연구하였다. 기존 연구자들이 제시한 열저항 상관식과 본 연구에서 수행한 실험결과의 비교를 통해 실험결과의 타당성을 검증하였다. 또한 실험결과를 바탕으로 자연대류 히트싱크의 열입력량, 휜 간격 및 높이, 그리고 경사각에 대하여 기존 연구자들이 제시한 상관식의 적용가능 범위를 평가하였다. In this paper, an experimental investigation is performed to estimate the thermal performance of a natural convective heat sink with plate fins subject to the uniform wall temperature condition. Extensive experiments are performed with various input powers, fin spacings, and heights of the natural convective heat sinks with plate fins. In particular, the effect of the inclination angle on the thermal performance of the heat sink is studied. In order to validate the experimental data, the experimental results are compared with results from previous studies. Based on the experimental results, the appropriate ranges of the previous correlations between the input power, the fin spacing, the fin height, and the inclination angle for the natural convective heat sink with plate fins are evaluated.
고집광 태양광 모듈용 냉각 장치의 열성능에 대한 수치 해석적 연구
도규형(Kyu Hyung Do),김태훈(Taehoon Kim),한용식(Yong-Shik Han) 한국태양에너지학회 2015 한국태양에너지학회 논문집 Vol.35 No.1
In the present study, the effects of the heat spreader thickness and the heat sink size on the thermal performance of a cooling device for a concentrating photovoltaic (CPV) module were numerically investigated. Numerical simulation was conducted by using the simulation tool ICEPAK, commercial software based on the finite volume method. Numerical results were validated by comparing the existing experimental data. The thermal performance of a cooling device, which consisted of a heat spreader and a natural convective heat sink, was evaluated with varying the heat spreader thickness and the heat sink size. The geometric configuration of the natural convective heat sink, such as the fin height, the fin spacing, and the fin thickness, was optimized by using the existing correlation. The numerical results showed that the thermal performance of the cooling device increased as the heat spreader thickness or the heat sink size increased. Also, it was found that the spreading thermal resistance plays an important role in the thermal performance of the cooling device which has the localized heat source.
경사각이 플레이트-휜을 가지는 자연대류 히트싱크의 열성능에 미치는 영향
도규형(Kyu Hyung Do),김태훈(Tae Hoon Kim),한용식(Yong Shik Han),최병일(Byung-Il Choi),김명배(Myung Bae Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
In this paper, an experimental investigation is performed for estimating the thermal performance of a natural convective heat sink with plate-fins subject to the uniform wall temperature condition. Extensive experiments are performed with various input powers and fin spacings and heights of natural convective heat sinks with plate-fins. Especially, the effect of the inclined angle on the thermal performance of the heat sink is studied. In order to validate the present experimental data, experimental results are compared with the results from previous studies. Based on the experimental results, an applicable range of existing correlations for natural convective heat sink with plate-fins is evaluated with respect to the input power, the fin spacing, the fin height, and the inclined angle.
수직방향 플레이트-휜을 가지는 자연 대류 히트싱크의 열성능에 관한 실험적 연구
도규형(Kyu Hyung Do),김태훈(Tae Hoon Kim),한용식(Yong-Shik Han),최병일(Byung-Il Choi),김명배(Myung-Bae Kim),이유환(Yu-Whan Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this paper, an experimental investigation is performed for estimating the thermal performance of a natural convective heat sink with vertically oriented plate-fins subject to the uniform wall temperature condition. Extensive experiments are performed with various input powers and channel widths and heights of natural convective heat sinks with plate-fins. Numerical simulations are performed to validate experimental results. Also, experimental results are compared with the results obtained from previous correlations. It is shown that the influence of inflow from the front significantly affects the thermal performance of the heat sink and should be considered to accurately predict thermal resistance of the natural convective heat sink with plate-fins.
열분산기 두께 및 히트싱크 크기가 고집광 태양광 모듈용 냉각 장치의 열성능에 미치는 영향
도규형(Kyu Hyung Do),김태훈(Taehoon Kim),최병일(Byung-Il Choi),한용식(Yong-Shik Han),김명배(Myung-Bae Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
In the present study, the effects of the heat spreader thickness and the heat sink size on the thermal performance of a cooling device for a concentrating photovoltaic (CPV) module are numerically investigated. Numerical simulation was conducted by using the simulation tool ICEPAK, commercial software based on the finite volume method. The thermal performance of a cooling device, which consists of a heat spreader and a natural convective heat sink, was evaluated with varying the heat spreader thickness and the heat sink size. The geometric configuration of the natural convective heat sink, such as the fin height, the fin spacing, and the fin thickness, was optimized by using the existing correlation. The numerical results showed that the thermal performance of the cooling device increased as the heat spreader thickness or the heat sink size increased. Also, it was found that the spreading thermal resistance plays an important role in the thermal performance of the cooling device which has the localized heat source.