• 융합정보논문지
• /
• 제12권3호
• /
• pp.294-301
• /
• 2022

본 연구에서는 열전발전기에 장착된 열전소자 간의 불균일한 온도편차에 의해 발생하는 부정합 손실을 저감할 수 있는 Multi-layer Cascade (MLC) 전기연결 방법을 제안한다. MLC의 성능을 검증하기 위해 열유동 현상 뿐만 아니라 열전소자에서 발생하는 다중물리현상을 반영한 수치해석 모델을 개발하였다. MLC는 고온도차를 경험하는 소자와 저온도차를 경험하는 소자를 서로 다른 Layer에 배치하여 구현할 수 있으며, 고온도차 소자와 저온도차 소자의 분류에는 수치해석 모델을 통해 얻어진 소자별 고온부 표면 온도를 활용하였다. MLC를 구성하는 각 Layer의 전기분선 비율을 변화시키며 이상적인 열전발전 성능과의 비교를 통해 MLC의 부정합손실 저감특성을 확인하였다. 최적 분선비율로 구성한 MLC의 경우 이상적인 결과 대비 96.5%의 발전성능을 보였으며, 열원의 유량이 적거나 발전시스템의 크기가 증가하여 소자 간의 온도편차가 클수록 부정합손실 저감효과가 더욱 증가하는 것을 확인하였다.

• 한국마린엔지니어링학회:학술대회논문집
• /
• 한국마린엔지니어링학회 2011년도 후기공동학술대회 논문집
• /
• pp.92-92
• /
• 2011

• 한국재료학회:학술대회논문집
• /
• 한국재료학회 2005년도 춘계학술발표대회 및 제8회 신소재 심포지엄 논문개요집
• /
• pp.31-31
• /
• 2005

• 한국재료학회:학술대회논문집
• /
• 한국재료학회 2000년도 추계학술발표강연 및 논문개요집
• /
• pp.145-145
• /
• 2000

• 한국재료학회:학술대회논문집
• /
• 한국재료학회 2002년도 추계학술발표강연 및 논문개요집
• /
• pp.168-168
• /
• 2002

• 한국세라믹학회지
• /
• 제51권6호
• /
• pp.549-553
• /
• 2014

$CoSb_3$-based skutterudite compounds are candidate materials for thermoelectric power generation in the mid-temperature range (600 - 900 K) because their thermoelectric properties can be enhanced by doping and filling. The joining property of thermoelectric module electrodes containing thermoelectric materials is of great importance because it can dominate the efficiency of the thermoelectric module. This study examined the properties of $CoSb_3$/Al/Ti/CuMo joined by the spark plasma sintering technique. Titanium thin foil was used to prevent the diffusion of copper into $CoSb_3$ and Aluminum thin foil was used to improve the adhesion between $CoSb_3$ and Ti. The insertion of an Aluminum interlayer between the Ti and $CoSb_3$ was effective for joining $CoSb_3$ to Ti by forming an intermediate layer at the Al-$CoSb_3$ boundary without any micro cracks. Specifically, the adhesion strength of the Ti/Al/$CoSb_3$ joining interface showed a remarkable improvement compared with our previous results, without deterioration of electrical property in the interface.

• 한국기후변화학회지
• /
• 제9권2호
• /
• pp.197-207
• /
• 2018

The Korean government views coal-fired power plants as the key cause of the fine dust generation, and is developing an energy policy to replace and demolish old coal-fired power plants. According to the Eighth Power Supply Base Plan (2017-2031), the maximum power capacity in 2030 is expected to be 100.5GW, which is 17.9% higher than the current level (85.2GW). The plan aims to reduce the facility size and power generation ratio from nuclear and coal resources to even lower levels than today, and to rapidly expand power generation from new and renewable energy. Despite that, the proportion of coal power generation is still much higher than other resources, and it is expected that the reliance on goal will maintain for next several decades. Under such circumstances, the development, supply, and expansion of clean coal technology (CCT) that is eco-friendly and highly efficient, is crucial to minimize the emission of pollutants such as carbon dioxide and fine dust, as well as maximize the energy efficiency. The Korean government designated the Yong-Dong Thermoelectric Power Plant in Gangneung to develop clean coal power generation, and executed related projects for three years. The current study aims to suggest a plan to develop parts, technologies, testing, evaluation, certification, and commercialization efforts for coal-fired power generation, In addition, the study proposes a strategy to vitalize local economy and connect the development with creation of more jobs.

• 융합정보논문지
• /
• 제11권2호
• /
• pp.90-97
• /
• 2021

본 연구에서는 산업현장에서 미활용되는 열에너지를 회수하여 유용한 전기에너지로 변환하기 위한 Bi2Te3 계열 열전소자를 제작하고 에너지회수 성능 및 물성을 도출하였다. 성능시험을 위하여 카트리지 히터 가열 방식의 가열블록과 냉매가 흐르는 냉각블록으로 구성된 전용 실험장치를 구성하였으며, 가열블록과 냉각블록에는 3×3 배열의 열전대를 장착하여 소자 양 면 온도와 열전달율을 도출하였다. 최소 온도차 27K부터 최대 온도차 172.2K까지 총 9가지의 온도차에 대해 실험을 수행하여 V-I curve와 P-R curve를 도출하였고 성능에 주요한 영향을 미치는 제벡계수 등 변수 7가지에 대하여 온도차에 대한 함수로 결과를 제시하였다. 최대 발전양 7.5W와 변환효율 11.3%의 결과로부터 개발된 열전소자의 열에너지 회수 성능의 타당성을 검증하였다.

• 한국세라믹학회지
• /
• 제52권1호
• /
• pp.1-8
• /
• 2015

Thermoelectric (TE) technology is becoming increasingly important in applications of solid-state cooling and renewable energy sources. $Bi_2Te_3$-based TE materials are widely used in small-scale cooling and temperature control applications; however, higher levels of TE performance are required for new applications such as large-scale cooling (e.g., domestic refrigerators or air conditioners) and for highly efficient power generation system. Recently, the TE performance of $Bi_2Te_3$-based materials has been remarkably enhanced by the introduction of nanostructuring technologies which can be used to prepare TE raw materials. Because it takes into account the theoretical and experimental characteristics, nanostructuring has been shown to be one of the most promising ways to realize the simultaneous control of the electronic and thermal transport properties. In this review, emphasis is placed on bulk-type nanostructured $Bi_2Te_3$-based TE materials. Nanostructuring technologies for enhanced TE performance are summarized, and a few important strategies are presented.

• 한국재료학회지
• /
• 제19권12호
• /
• pp.699-702
• /
• 2009

Due to the importance of the SiGe/Si heterostructure in the fields of thermoelectric and electronic applications, SiGe/Si heterostructures have been extensively investigated. For practical applications, thermal stability of the heterostructure during the thermoelectric power generation or fabrication process of electronic devices is of great concern. In this work, we focused on the effect of thermal annealing on the defect configuration in the SiGe/Si heterostructure. The formation mechanism of planar defects in an annealed SiGe/Si heterostructure was investigated by transmission electron microscopy. Due to the interdiffusion of Si and Ge, interface migration phenomena were observed in annealed heterostructures. Because of the strain gradient in the migrated region between the original interface and the migrated interface, the glide of misfit dislocation was observed in the region and planar defects were produced by the interaction of the gliding misfit dislocations. The planar defects were confined to the migrated region, and dislocation pileup by strain gradient was the origin of the confinement of the planar defect.