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고동국(Dong Guk Ko),김민수(Min Soo Kim) 대한기계학회 2018 大韓機械學會論文集B Vol.42 No.8
본 연구에서는 UCD 램프의 방열성능에 대한 방열핀의 종횡비와 반경의 영향을 해석적 방법을 이용하여 분석하였으며, 해석에 사용된 격자수와 크기는 각각 11,000개와 0.02 mm이다. 방열핀의 전열면적은 4 ㎟로 일정하게 유지시켰으며, 방열핀의 종횡비는 각각 1.0(기본모델), 1.8, 1.41, 0.56 및 0.29이다. 또한 방열핀의 반경 R은 각각 0.0 mm, 0.3 mm, 0.6 mm, 0.9 mm 및 1.2 mm이다. 핀에 가해진 열의 유속과 시간은 각각 1×105 W/㎡과 0.1 초, 0.2 초, 0.5 초, 1 초, 2 초, 5 초 및 10 초이다. 결과적으로 UCD 램프 방열의 방열성능은 핀의 종횡비와 반경이 각각 1.8과 1.2 mm일 경우 가장 우수하였으며, 기본모델보다 5.7% 상승하였다. In this study, the effects of the aspect ratio and radius of the heat dissipation fin on the heat dissipation performance of a UCD lamp were analyzed using an analytical method. The minimum grid size and number of meshes of the fin used for numerical analysis were 0.02 mm and 11,000, respectively. The heat transfer area of the fin was kept constant at 4 mm². The aspect ratios of the fin were 1.0 (base model), 1.8, 1.41, 0.56, and 0.29, and the respective radii of the fin were R=0.0 mm, 0.3 mm, 0.6 mm, 0.9 mm, and 1.2 mm. The heat flux and heat flux time applied to the fin were 1×105 W/㎡ and 0.1 s, 0.2 s, 0.5 s, 1 s, 2 s, 5 s, and 10 s, respectively. The heat dissipation performance of the UCD lamp was the best when the aspect ratio and radius of the fin were 1.8 and 1.2 mm, respectively, and showed an increase of 5.7% from the base model.
고동국(Dong Guk Ko),김민수(Min Soo Kim) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
In this study, we propose a method to maximize the heat dissipation performance of a UCD lamp that realizes an 8-wavelength spectrum with sunlight characteristics by using mixed metal and special xenon gas. The aspect ratio and radius of fin were analyzed by analytical method. The minimum mesh size used for the heat dissipation fin was 0.02 mm and the number of mesh was approximately 11,000. In order to understand the effect of the aspect ratio and the radius, the heat transfer area of the fin was kept constant at 4 mm². The fin had an aspect ratio of 1.00(2.00 mm: 2.00 mm(basic model)), 1.41(1.70 mm: 2.40 mm), 1.80(1.50 mm: 2.70 mm), 0.56(2.40 mm: 1.70 mm), and 0.29(2.70 mm: 1.50 mm), respectively. The radius of fin was 0 mm, 0.3 mm, 0.6 mm, 0.9 mm and 1.2 mm, respectively. The heat flux and the heat flux time applied to the fin were 1×10<SUP>5</SUP> W/㎡ and 0.1 second, 0.2 second, 0.5 second, 1 second, 2 seconds, 5 seconds and 10 seconds, respectively. The heat dissipation performance of the UCD lamp was the best when the aspect ratio and radius of the fin were 1.8 and R=1.2 mm.
항공기용 전동기의 냉각수 유로 구성에 따른 방열 성능의 수치적 예측
조용우(Yong Woo Cho),양성진(Sungjin Yang),서정무(Jung-Moo Seo),신용우(Yongwoo Shin),최종락(Jongrak Choi) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
In the present study, the heat-dissipation performances of the coolant passages were numerically investigated in an aircraft electric motor. The main heat-sourced parts, such as stators, hubs, wires, and iron cores, were considered with electromagnetic losses to focus on the heat transfer characteristics. The three-dimensional, steady-state simulations were carried out to describe flows in passages, and the conjugate heat transfer model was adopted. Various coolant passage configurations were considered to compare with heat-dissipation performances and pressure losses. Making the flow regime of the coolant passages turbulent was enhanced in heat transfer, and heat-dissipation performance and pressure loss appeared to be in a trade-off relationship. Those results can be used to get the advanced passages configuration and dimensional specifications.
사각 웨이브 형상을 갖는 판형 플라스틱 챠지에어쿨러의 방열성능 설계
이기수(Geesoo Lee),허형석(Hyungseok Heo),김현철(Hyunchul Kim),이승주(Seungjoo Lee) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study had dealt with the heat transfer characteristics of the automotive charge air cooler which had tubes of rectangular wave form. This study compared and investigated the characteristics as the number of tubes, the pitch and depth of the wave form of the tube on the basis of same core size. The proposed analysis was performed by applying the commercial fluid dynamics(CFD) code, Fluent 6.2, to the solution of 3-D turbulent flows of the plastic charge air cooler. It was found out that both heat transfer characteristics and charge air side pressure drop were linearly increased by severity factor for one step of plastic plate charge air cooler. In addition to, heat transfer performance of the plastic plate charge air cooler assembly with 36 steps of tubes was achieved by 6,850㎉/h at design point.
적외선 열화상을 활용한 리튬 이온 ESS의 방열설계 성능평가에 관한 연구
김은지(Eun-Ji Kim),이경일(Gyung-Il Lee),김재열(Jae-Yeol Kim) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.5
The global battery market is rapidly growing due to the development of vehicles(EV) and wireless electronic products. In particular logistics robots, which hielp to produce EVs, have attracted much interest in research in Korea Because logistics sites and factories operate continuously for 24 hours, the technology that can dramatically increase the operation time of the logistics equipment is rapidly developing, and various high-level technologies are required for the batteries used in. for example, logistics robots. These required technologies include those that enable rapid battery charging as well wireless charging to charge batteries while moving. The development of these technologies, however, result in increasing explosions and topical accidents involving rapid charging batteries These accidents due to the thermal shock caused by the heat generated during the charging of the battery cell. In this study, a performance evaluation of a heat dissipation design using infrared thermal imaging was performed on an energy storage systrm(Ess) applied with an internal heat conduction cooling method using a heating plate.