• Proceedings of the Computational Structural Engineering Institute Conference
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• 2005.04a
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• pp.291-294
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• 2005

본 해석은 제철용 고로 구조물에 대해여 고로 내의 온도 분포를 이용한 열전도 유한요소 해석을 수행하고자한다. 해석모델인 고로는 내화벽돌, 냉각판, 내화재(castable), 철피의 복잡한 구조로 이루어져있다. 각각의 재료뿐만 아니라 고로에 사용되어지는 모든 내화벽들의 재료 물성치 값을 사용하여 보다 실직적인 해석을 수행하고자 하며 고로의 냉각 시스템인 냉각판과 냉각 pipe의 효과 규명하고자 한다. 어떠한 부분 모델이 아니라 고로 전체를 대상으로 열전도 해석을 수행한다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.836_837
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• 2009

PC용 냉각장치의 일환으로 CPU의 외벽에 방열판을 달고 열전냉각모듈을 설치한 후 방열판을 냉각하기 위해서 펌프를 적용한 수냉식 냉각 시스템을 개발하고자 하였다. 먼저, 냉각 시 펌프의 부하를 설계하고 그 용량에 적절한 저소음, 고효율 BLDC 모터를 개발하고자, 상용화된 외국제품인 S사의 저효율 단상 BLDC 모터가 적용된 수냉식 펌프를 기준으로 하였다. S사의 단상 BLDC 모터에 대한 시뮬레이션과 테스트를 통해서 거의 비슷한 결과를 얻었으며, 이를 이용하여 단가가 다소 상승하더라도 효율과 성능을 향상시킬 수 있는 3상 BLDC 모터구조로 설계를 하였으며, 그 결과 효율이 거의 2배 향상되며 출력 또한 향상됨을 시뮬레이션으로 구현하였다.

• Electronics and Telecommunications Trends
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• v.30 no.1
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• pp.144-153
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• 2015

열전소자는 열에너지를 전기에너지로, 전기에너지를 열에너지로 직접 변환하는데 사용되는 소자로 자동차 온도조절 시트(Climate Control), 반도체(순환기, 냉각판), 바이오(혈액분석기, PCR, 시료온도싸이클 테스터기), 이학분야(스펙트로포토미터), 광학분야(CCD 쿨링, 적외선센서 냉각, 레이저다이오드 냉각, 포토다이오드 냉각, SHG레이저 냉각), 컴퓨터(CPU 냉각), 가전제품(김치냉장고, 소형냉장고, 냉온수기, 와인냉장고, 쌀통, 제습기), 산업분야(폐열발전기, 리모트 파워발전) 등 다양한 분야에 적용되고 있으며 새로운 시장을 창출하고 있다.

• Transactions of the Korean Society of Automotive Engineers
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• v.22 no.3
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• pp.60-67
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• 2014

The battery cells in lithium-ion battery pack assembled with high-capacity and high-power pouch cells, are commonly cooled with thin aluminum cooling plates in contact with the cells. For HEV/EV lithium-ion battery systems assembled with high-capacity, high-power pouch cells, the cells are commonly cooled with thin aluminum cooling plates in contact with the cells. Thin aluminum cooling plates are cooled by cold plate with coolant flow paths. In this study, the effect of the battery cooling system design including aluminum cooling plate thickness and various position of cold plate on the cooling performance are investigated by using finite element methods (FEM). Optimal cooling plate and cold plate design are proposed for improving the uniformity in temperature distributions as well as lowering average temperature for the cells with large capacities based on the simulation results.

• Journal of Korea Foundry Society
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• v.42 no.2
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• pp.77-82
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• 2022

Initial solidification condition during directional solidification of superalloy CM247LC was controlled with various cooling methods such as insertion of alumina disc or Ni foil or inoculant, and direct pouring of melt onto chill plate. Rapid cooling with direct pouring of melt onto chill plate resulted in generation of many fine grains and precipitation of fine γ' particles, as well as small dendrite arm spacing. Tensile properties of directionally solidified superalloy CM247LC were closely related to microstructure which was governed by initial solidification conditions. Directionally solidified CM247LC with small dendrite arm spacing and fine precipitates showed good tensile properties.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2006.05a
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• pp.130-134
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• 2006

The injection uniformity of the fuel manifold in a liquid rocket engine has been analyzed with dividing plates to improve the cooling performance at the face plate. Three dimensional computational fluid dynamics analysis has been performed to compare the injection uniformity for 5 candidate designs and has been verified to compare with the measured data for the optimal manifold design. For the case I and II, the coolant mass flux increases as the whole working fluid is enforced to flow under the dividing plate. The injection uniformity decreases due to the variation of mass flux at the end of dividing plate and the concentration of mass flow rate at the center of manifold. However case III and IV have uniform injection performance due to reduced mass flux concentration as the coolant can flow along both upper passage and lower passage of the dividing plate. Among the candidate designs, case IV is thought to be the optimal dividing plate with regard to cooling performance and injection uniformity.

• Proceedings of the KSME Conference
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• 2007.05b
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• pp.1864-1869
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• 2007

In this study, we compare thermal performance between four different types of cold plates for humanoid robot cooling. Two commercially available cold plates made of copper have different dimensions and internal flow paths: One has $20{\times}20$ $mm^2$ base area with micro-channels and the other has $62.5{\times}62.5$ $mm^2$ base area with 85 round pin-fins. And two different types of cold plates of $20{\times}20$ $mm^2$ base area with 7 mm high are made of PC (polycarbonate), which aims to reduce the weight of cooling system. All cold plates are mounted on a $20{\times}20$ $mm^2$ copper block with two cartridge heaters of 30 $W/cm^2$. The overall heat transfer coefficient and thermal resistances for the liquid-cooled cold plates are obtained. The copper cold plate with micro-channels showed the best performance. Polycarbonate cold plates display fairly good thermal performance with more reduced system weight.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.19 no.1
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• pp.86-93
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• 2007

The PEM (polymer electrolyte membrane) fuel cell is one of the promising fuel cell systems as a new small power generating device for automobiles and buildings. The optimal design of cooling plates installed between MEA (membrane electrode assembly) is very important to achieve high performance and reliability of the PEMFC because it is very sensitive to temperature variations. In this study, six types of cooling plate models for the PEMFC including basic serpentine and parallel shapes were designed and their cooling performances were analyzed by using three-dimensional fluid dynamics with commercial software. The model 3 designed by revising the basic serpentine model represented the best cooling performance among them in the aspect of uniformity of temperature distribution and thermal reliability, The serpentine models showed higher pressure drop than the parallel models due to a higher flow rate.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2007.05a
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• pp.389-392
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• 2007

본 연구는 지벡(Seebeck)효과를 이용한 열전발전소자의 효율증가를 위한 Cooling System에 대한 연구이다. 열전발전소자는 Hot side와 Cool side의 온도차에 의해 전력발생 효율이 결정되며 열전발전소자가 견딜 수 있는 Hot Side의 온도는 고정돼있는 반면, Cool Side의 온도는 Cooling System의 설계에 따라 온도 설정이 가능하다. 본 연구는 Cooling System은 방열판과 팬으로 구성된 공랭방식을 사용하였고, 냉각효율을 높이기 위해 방열판의 크기 및 모양 팬의 크기와 속도 공기의 이동방향에 따른 냉각특성을 실험하였고 그에 따른 특성들을 논하고자 한다.

• Journal of the Korean Society for Precision Engineering
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• v.25 no.5
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• pp.7-14
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• 2008