• Title/Summary/Keyword: Cooling material

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The Effect of Cooling Rate on the Solidification Behavior and Segregation of 7075 and 7050 Aluminum Alloys (7075 및 7050 알루미늄 합금의 응고 거동 및 편석에 미치는 냉각 속도의 영향)

  • Choi, Jeong-Yun;Kwon, Young-Dong;Lee, Joo-Won;Lee, Zin-Hyoung
    • Journal of Korea Foundry Society
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    • v.21 no.6
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    • pp.343-349
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    • 2001
  • The effect of cooling rate on the solidification microstructure and segregation behavior of 7075 and 7050 aluminum alloy was investigated. Samples were solidified with cooling rates from 0.3 to $17^{\circ}K/sec$. Using the cooling curves of each sample, liquidus, eutectic and intermetallic reaction temperatures were estimated. The microstructures were characterized in terms of dendrite arm spacing and eutectic volume fraction. The segregation behavior of each alloying element of these alloys in various cooling rates was discussed.

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Effects of Phase Change Material Floor Heating Systems using Direct Solar Gain on Cooling Load (직달일사를 이용한 잠열축열식 바닥난방 시스템이 냉방부하에 미치는 영향에 대한 검토)

  • Kim, Soo-Kyung
    • Journal of the Korean Solar Energy Society
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    • v.33 no.3
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    • pp.9-16
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    • 2013
  • In this research, the effect of a heating system, which is powered by direct solar energy accumulated in phase change material (PCM) as heat storage material installed on the floor surface, on the cooling load was studied. Cooling load of a test building designed for this research was measured with fan coil unit and factors affecting it were also estimated. Experiments were performed with and without PCM installed on the building floor to understand the effect of the PCM on the cooling load. Additionally, to confirm the experiments results, the prediction calculation formula by average outside temperature and integrated solar radiation was composed using multivariate regression model. The results suggested that the heating system with PCM on the floor surface has the potential to shift electric power peak by radiating heat, stored during the daytime in it, at night, not increasing the total cooling load much.

Study of the robot gripper cooling device for a high temperature material using peltier element (열전소자를 이용한 고온용 로봇 그리퍼 냉각장치에 관한 연구)

  • Shin, Gi-Su;Hong, Sung-Duk;Kim, Gun-Su;Kwon, Soon-Jae
    • Journal of the Korean Society of Industry Convergence
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    • v.18 no.1
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    • pp.37-44
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    • 2015
  • In the research, we developed a device for cooling the drive section of the gripper of a robot for handling the high temperature material. In this study, By using a Peltier element, the high-temperature material is not affected and driving cylinder is cooled to prevent damage due to high temperatures. Hot part of the Peltier element is towards the robot gripper. Cool part of the Peltier element is towards the driving cylinder. The heat sink portion is made to keep the cooling effect. As the performance result, cooling-test is taken, and their result is satisfy.

Study on cooling performance and isothermal maintenance of cylindrical type lithium-ion battery cell using phase change material (상변화물질을 활용한 원통형 리튬이온 배터리 셀의 냉각성능 및 등온유지성에 관한 연구)

  • Jae Hyung Yoon;Su Woong Hyun;Hee Jun Jeong;Dong Ho Shin
    • Journal of the Korean Society of Visualization
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    • v.21 no.2
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    • pp.34-45
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    • 2023
  • When lithium-ion batteries operate out of the proper temperature range, their performance can be significantly degraded and safety issues such as thermal runaway can occur. Therefore, battery thermal management systems are widely researched to maintain the temperature of Li-ion battery cells within the proper temperature range during the charging and discharging process. This study investigates the cooling performance and isothermal maintenance of cooling materials by measuring the surface temperature of a battery cell with or without cooling materials, such as silicone oil, thermal adhesive, and phase change materials during discharge process of battery by the experimental and numerical analysis. As a result of the experiment, the battery pack filled with phase change material showed a temperature reduction of 47.4 ℃ compared to the case of natural convection. It proves the advanced utility of the cooling unit using phase change material that is suitable for use in battery thermal management systems.

The Effect of Forming Parameter on Mechanical Properties in Hot Bending Process of Boron Steel Sheet (보론강판의 열간 벤딩 공정에서 성형인자가 기계성질에 미치는 영향)

  • Kwon, K.Y.;Sin, B.S.;Kang, C.G.
    • Transactions of Materials Processing
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    • v.19 no.4
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    • pp.203-209
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    • 2010
  • In the hot press forming process (HPF), a martensitic structure is obtained by controlling the cooling rate when cooling a boron sheet that is heated up to over $900^{\circ}C$. The HPF process has various advantages such as the improvement in formability and material properties and minimal spring back of the deformed materials. The factors related to the cooling rate depend on the heat transfer characteristics between heated materials and dies. Therefore, in this study, the cooling rate is controlled by adjusting the heat transfer coefficient of the material at the pressing process. And, the mechanical properties and microstructure of the deformed material is demonstrated during the HPF process where cold dies are used to form the heated steel plate. This is achieved by varying the major forming conditions that control the cooling rate regarded as the most important process parameter.

Analytical Study on Thermal Cracking Control of Mass Concrete by Vertical Pipe Cooling Method (연직파이프쿨링 공법에 의한 매스콘크리트 온도균열 제어에 관한 해석적 연구)

  • Seo, Tae-Seok;Cho, Yun-Gu;Lee, Kewn-Chu;Lim, Chang-Keun
    • Journal of the Korea Concrete Institute
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    • v.26 no.1
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    • pp.57-62
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    • 2014
  • In this study, the vertical pipe cooling method was developed to propose the pipe cooling method suited for the vertically long mass concrete structures. FEM (finite element method) analysis was carried out to investigate the validity of the vertical pipe cooling method, and the temperature, the behavior of tensile stress of concrete and the crack index were investigated. In result, it was confirmed that the vertical pipe cooling method was effective in the thermal cracking control of mass concrete member.

The Critical Characteristics Attributed to the Slow Cooling and Annealing Time in the Melting Growth (용융성장시 서냉시간과 후열처리시간에 따른 임계특성)

  • 임성훈;최명호;강형곤;정동철;박종광;한병성
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.11 no.4
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    • pp.327-333
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    • 1998
  • The influence of slow cooling and annealing time in $O_2$in MPEG process on $J_c$ was investigated. From the measurement of $J_c$,SEM and XRD, it was observed that the critical current density was related with the slow cooling time and annealing time in $O_2$. The value of $J_c$ was the highest at slow cooling time of 40 hour. And also, the value of $J_c$ along the annealing time in $O_2$in the case of the slow cooling time of 40 hours was inclined to increase with annealing time. Consequently, it can be suggested that proper slow cooling time and annealing time after slow cooling in MPMG process be important to improve the critical characteristics.

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The critical characteristics resulted from the slow cooling time in the HTSC bulk fabrication (초전도벌크제작시 서냉시간에 따른 임계특성)

  • 임성훈;강형곤;최명호;임성우;한병성
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1997.11a
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    • pp.185-188
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    • 1997
  • The influence of slow cooling and annealing time in $O_2$ during melting and growth step in MPMG process on J$_{c}$ was investigated. Through the measurement of J$_{c}$ SEM and XRD, it can be observed that the critical characteristics were related with the slow cooling time and annealing time in 02 for melting and growth step of MPMG process. The distribution of critical current density with slow cooling time was the porabolic form and the value of J. was the highest at the 40 hour slow cooling time. And also, the value of J$_{c}$, along the annealing time in $O_2$ in the case of the slow cooling time 40 hour was inclined to increase with annealing time. Consequently, it can be suggested that proper slow cooling titre and annealing time along slow cooling in MPMG process be important to improve the critical characteristics.stics.

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Cooling Performance Analysis of Water-Cooled Large Area Magnetron Sputtering System (대면적 마그네트론 스퍼터링 증착장비의 수냉시스템 방열성능 해석)

  • Kim, Kyoung-Jin
    • Journal of the Semiconductor & Display Technology
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    • v.9 no.2
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    • pp.111-116
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    • 2010
  • In a large area magnetron sputtering system, which is under the influence of high heat load from the plasma, it is necessary to use the effective water cooling in order to maintain the proper deposition performance and the economic use of target materials. A series of three-dimensional numerical simulations are carried out on the simplified model of the large area magnetron sputtering system with the cooling plate that includes the U-shaped water channel. The analysis is focused on the effects of water channel geometry, cooling water flowrate, thermal conductivity of target material, and the degree of target erosion on the cooling performance of cooling plate, which is represented by the temperature distribution of target material.

Development of Passive Cooling System for Communication Cabinet by Latent Heat Material. (잠열재를 이용한 통신 캐비넷용 Passive 냉각시스템 개발)

  • Chung, Dong-Yeol;Park, Shung-Sang;Peck, Jong-Hyeon
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.1385-1390
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    • 2009
  • In this study the purpose is development of passive cooling system for telecommunication cabinet used by latent heat material. This cooling system is not required for electronic power. It was tested for the performance of the telecommunication combined latent heat material with $48^{\circ}C$ of phase changed temperature and heat pipe. At $45^{\circ}C$ of outside temperature, when heater power was 1,000 W and 1,500 W, the inside temperature of the cabinet was $55^{\circ}C$ and $62^{\circ}C$. This system was showed better performance than the other systems.

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