최적화알고리즘과 열해석을 통합한 위성방열판 설계의 최적화 방법에 관한 연구

김희경(Hui-Kyung Kim) 한국항공우주연구원 2013 항공우주기술 Vol.12 No.2

위성방열판은 내부의 부품유닛에서 발생하는 열을 외부우주로 방출하는 열전달경로를 확보하기 위해 적용되는 열제어방법 중 한 가지로서, 이것의 최적설계는 효율적인 위성 열설계의 한 방향이 될 수 있다. 본 연구는 위성 열제어 개발에서 활용하는 위성 열해석과 최적화알고리즘을 결합한 통합해석을 통하여 위성열모델 노드기반의 방열판설계최적화 접근방식을 제안하였다. 이 방법은 위성열해석과 최적화알고리즘의 해석소프트웨어의 종류에 상관없이 적용가능한 개념이며, 일반적인 위성열모델을 사용한 방열판설계의 개념을 그대로 유지하면서 최적화를 할 수 있기 때문에 위성설계에 실제적으로 사용할 수 있다. 또한, 두 해석소프트웨어를 결합하는 전체적인 해석구조와 본 방열판 설계 최적화문제에 대한 정식화를 제시하였다. A spacecraft radiator is a thermal control method to eject internally dissipated heat into the space generated from operation of unit boxes. The efficiency of thermal design may be improved by optimizing radiator design. In this paper, the optimization approach method of node-based radiator design was suggested which is to combine numerical thermal analysis with optimization algorithm. This method has meaning that it can be used practically to implement the spacecraft radiator design regardless of thermal analysis and optimization algorithm software and maintain the same basic concept of an ordinary radiator design approach based on node division of a thermal model. The overall analysis framework with thermal analysis and optimization algorithm would be presented.

지구 저궤도에서 운용되는 영상센서를 위한 열설계 및 열해석

신소민(Somin Shin),오현웅(Hyun-Ung Oh) 한국항공우주학회 2011 韓國航空宇宙學會誌 Vol.39 No.5

지구의 저궤도에서 운용되는 영상센서는 극저온 환경에서 태양 복사 뿐 아니라 지구의 적외선 및 알베도(Albedo)의 영향을 받는다. 극한 환경에 노출되는 영상센서는 작동/비작동시 허용 온도를 벗어나지 않도록 열설계가 필요하며, 정상상태 에너지 평형식을 통해 필요한 방열판 면적 및 히터 예비 설계 값을 설정한다. 일반적으로 위성체 패널에 주기를 갖는 발열장비가 장착되어, 패널의 일부를 방열판 면적으로 설계한다. 본 논문에서는 위성체와 분리하여 설계하는 영상센서의 열제어를 위하여, 내부에서 항상 발열하는 장비의 열을 히트파이프를 이용하여 패널에 장착된 방열판으로 효과적으로 전달하도록 설계하였다. 예비 설계값을 기준으로 수치해석에 기반을 두는 SINDA를 이용하여 궤도 열해석을 실시하여, 방열 면적 및 히터 설계는 쉽고 빠르게 계산되어졌다. 또한, 방열 성능을 유지하면서 질량을 줄이도록 방열판을 립형상(Rib-type)으로 설계하였으며, 궤도 열해석 결과, 영상센서의 열적 요구사항을 만족함을 검증하였다. Space Imaging Sensor operated on LEO is affected from the Earth IR and Albedo as well as the Sun Radiation. The Imaging Sensor exposed to extreme environment needs thermal control subsystem to be maintained in operating/non-operating allowable temperature. Generally, units are periodically dissipated on spacecraft panel, which is designed as radiator. Because thermal design of the imaging sensor inside a spacecraft is isolated, heat pipes connected to radiators on the panel efficiently transfer dissipation of the units. First of all, preliminary thermal design of radiating area and heater power is performed through steady energy balance equation. Based on preliminary thermal design, on-orbit thermal analysis is calculated by SINDA, so calculation for thermal design could be easy and rapid. Radiators are designed to rib-type in order to maintain radiating performance and reduce mass. After on-orbit thermal analysis, thermal requirements for Space Imaging Sensor are verified.

최적화알고리즘과 열해석을 통한 위성방열판 최적설계 방법에 관한 연구

김희경,최성임,최석원 한국항공우주학회 2012 한국항공우주학회 학술발표회 논문집 Vol.2012 No.11

위성방열판은 내부의 부품유닛에서 발생하는 열을 외부우주로 방출하는 열전달경로를 확보하기 위해 적용되는 열제어방법 중 한가지로서, 이것의 최적설계는 효율적인 열설계의 한 방향이 될 수 있다. 본 연구는 위성열제어개발에서 사용하는 위성열모델과 수치열해석 소프트웨어와 최적화알고리즘을 연결하는 개념으로 위성열모델 노드기반의 방열판설계최적화 접근방식을 제안하였다. 이 방식은 수치열해석과 최적화알고리즘의 각 소프트웨어의 종류에 상관없이 적용가능하며, 위성열모델을 사용한 보편적인 방열판 설계의 개념을 유지하면서 최적화를 하기 때문에 위성설계에 실제적으로 적용가능하다는 점이 그 의미가 있다. A spacecraft radiator is a thermal control method to secure a path of heat transfer for ejecting internally-dissipated heat due to unit boxes. The more efficient thermal design can be achieved by the radiator optimum design. In this paper, the optimization approach method of a node-based radiator design was suggested which is to couple numerical thermal analysis with optimization algorithm. This method has the meaning that it can be applied regardless of thermal analysis and optimization algorithm software and used practically to implement the spacecraft radiator design because it has the same basic concept with a ordinary approach method of radiator design with a thermal analysis model.

능동형 안테나 시스템의 방열설계에 관한 연구

정용인(Yong-In Joung),권민상(Min-Sang Kwon),류준석(Jun-Suk Ryu),박동명(Dong-Myung Park) 한국항공우주학회 2018 韓國航空宇宙學會誌 Vol.46 No.8

본 연구는 능동형 안테나 시스템의 안정적인 임무수행을 위하여 열적 신뢰성을 고려한 방열설계에 관한 연구이다. 능동형 안테나는 송수신부에 고성능의 고발열 소자들이 존재한다. 안테나의 성능 유지를 위해서는 방열설계를 통해 고발열 소자들에서 발생하는 열을 효과적으로 제거하고, 적정한 온도범위에서 동작할 수 있도록 하여야 한다. 능동형 안테나의 송수신부는 고발열부로 액체냉각을 이용한 방열이 효과적이다. 본 연구에서는 능동형 안테나의 열적 성능을 만족하기 위하여 액체냉각 시스템을 포함한 방열설계를 수행하였으며, 이를 수치해석을 통해 분석, 검증하였다. In this paper, we studied on the thermal design of the active antenna system for stable performance considering thermal reliability. The active antenna has high performance and heat flux elements in T/R modules. Thermal heating of elements in T/R modules has to be dissipated effectively and the antenna has to be operated over the range of suggested temperature by the thermal design. T/R modules of high heat flux in the active antenna can be dissipated effectively by liquid cooling. In this study, we studied on the thermal design including the liquid cooling system to optimize the thermal performance of the active antenna. And the thermal design was verified by numerical analysis.

자료처리/저장장치 방열판의 View Factor 분석

황인영(Inyoung Hwang),신소민(Somin Shin) 한국항공우주학회 2017 韓國航空宇宙學會誌 Vol.45 No.8

지구관측위성에 탑재되는 자료처리/저장장치 방열판은 장비의 주기적인 고발열, 배치, 장착성 등 설계 특성으로 인해 쉴드가 장착된 홈 형태를 갖는다. 홈 형태 방열판의 영향성과 쉴드 방열판의 열성능을 확인하기 위해, 평판 방열판을 기준으로 홈 형태의 방열판과 쉴드 방열판을 비교하여 열진공 시험을 실시하였다. 시험결과를 바탕으로 view factor에 의한 열교환과 방열판의 온도를 이론해석적으로 분석하여 열 설계 성능비교의 타당성을 입증하였다. The radiator of the data storage and handling units onboard the earth observation satellite is a groove-type radiator covered with a shield because of the periodic high heat dissipation and design characteristics of arrangement and mountability of the unit. The effect of the groove-type radiator and that of the shield versus plane radiator were verified through the thermal vacuum test. Through the test result, the temperatures of the radiator and the heat exchange due to the view factor were analyzed by using the analytical method. Conclusively the thermal performance of the shield dissipation plate was verified.

제로에너지 공동주택에서 바닥복사난방패널의 방열량 설계 기준 평가

임재한 한국건축친환경설비학회 2022 한국건축친환경설비학회 논문집 Vol.16 No.4

This study aims to analyze the thermal output and downward heat loasses according to the pipe pitch of the floor heating panels for the design of a radiant floor heating system in a zero-energy apartment to compare the design heating load in zero-energy apartment housing unit. The thermal output and downward heat losses were analyzed according to the pipe pitches, flooring and pipe materials by using the universial single power function method in ISO 11855-2. The results showed that the heating load could be removed even if the pipe pitch of the existing radiant floor heating system is changed to around 350 mm as the thermal insulation and airtightness in the zero-energy apartment building has been greatly improved. The thermal output in individual heating was about 30% higher than that of district heating. In addition, it was found that it was necessary to consider the thermal resistance of flooring materials for the design of the radiant floor heating panel because it would affect the thermal output through the room air. When the lowerest floor was exposed to the outside air, downward heat losses greatly increased, so it would be necessary to increase the outside thermal insulation thickness for the energy saving during heating operation.

RC 네트워크 모델 및 유한차분법에 의한 구체축열시스템의 방열량 해석

송진희(Song Jin-Hee),구보경(Koo Bo-Kyoung),송승영(Song Seung-Yeong),임재한(Lim Jae-Han) 한국건축친환경설비학회 2011 한국건축친환경설비학회 학술발표대회 논문집 Vol.2011 No.10

This study is focused on the evaluation of thermal output of TABS(Thermally Activated Building System) according to the ISO 11866. The aim of this study is to evaluate TABS in terms of the temperature difference between heating medium supply temperature(Ts) and return temperature(Tr), thermal output and the surface temperature distribution according to the design flow rate and the design flow temperature. For this purpose, the RC network model and FDM method in ISO 11866 were firstly reviewed. Through the transient heat transfer simulation using temperature calculation using Cranck-Nicolson FDM using Physibel Voltra 6.0W, the temperature difference between Ts and Tr, thermal output and the surface temperature distribution of specific TABS was calculated and evaluated. The results show that specific thermal output and temperature difference at 60℃ of supply water temperature were about 162 W/m², 13.6℃ respectively.

열전도성 플라스틱을 이용한 30W급 LED light engine의 방열설계에 관한 연구

최원호,최두호,박대희 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.1

The study will design the structural optimization of 30W LED heat sink using the thermal conductive plastic materials. The advantages of thermal conductive plastic heat sink are having formability and being able to lighten products. A heat sink was optimized in terms of the number, and the thickness of fins and the base thickness of the heat sink, using the Heatsinkdesigner software. Also by using SolidWorks Flow simulation and thermal analysis software, the thermal characteristics of the heat sink were analyzed. As the result, the optimized heat sink has 22 fins, which are 1.5mm thick and a 3.8mm-thick base. The weight of the heat sink was 310g, and the highest and the lowest temperature were 64.93℃ and 45.96℃ respectively. Because of the low thermal conductivity of the thermal conductive plastic, the highest and the lowest temperature of the thermal conductive plastic heat sink were 14.3℃ higher and 2.19℃ lower respectively than an aluminum heat sink.

전자통신 시스템의 저소음 냉각 설계기술 개발

이정환(Jung-Hwan Lee),윤홍우(Hong-Woo Yoon),유성열(Seong-Ryoul Ryoo),김종만(Jong-Man Kim),전지환(Ji-Hwan Jun),김철주(Chul-Ju Kim),서명원(Myung-Won Suh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6

The purpose of this study is to investigate the cooling performance of heat sinks for telecommunication system by adequate natural convection. Heat generation rates of electronic components, temperature distributions of heat sinks and surrounding air are analyzed by experimental and numerical works. In order to perform the heat transfer analysis for the thermal design of telecommunication system, a program is developed. The program is capable of determining the arrangement of heat sources, interior fan capacity and configuration of the heat sink by graphic user interface environment. The simulation results indicate that a cooling capacity of up to 230W at a maximum temperature difference of 19℃ can be attainable. In order to verify the results from the numerical simulation, the experiment under the same condition is conducted, and their comparisons are made. Resulting, the design program can be a good tool to predict the effects of various parameters involved in the design of the heat sink for telecommunication system.

순차적 근사최적화 기법을 이용한 방열판 최적설계

박경우,최동훈 대한설비공학회 2004 설비공학 논문집 Vol.16 No.12

The shape of plate-fin type heat sink is numerically optimized to acquire the minimum pressure drop under the required temperature rise. In constrained nonlinear optimization problems of thermal/fluid systems, three fundamental difficulties such as high computational cost for function evaluations (i.e., pressure drop and thermal resistance), the absence of design sensitivity information, and the occurrence of numerical noise are commonly confronted. Thus, a sequential approximate optimization (SAO) algorithm has been introduced because it is very hard to obtain the optimal solutions of fluid/thermal systems by means of gradient-based optimization techniques. In this study, the progressive quadratic response surface method (PQRSM) based on the trust region algorithm, which is one of sequential approximate optimization algorithms, is used for optimization and the heat sink is optimized by combining it with the computational fluid dynamics (CFD).