• 제목/요약/키워드: 히트파이프

검색결과 337건 처리시간 0.025초

진공관형 집열기 히트파이프 접촉방식에 따른 집열성능 비교 (Comparison of Collecting Performance according to Contact Types of Heatpipe in Vacuum Tube Type Solar Collector)

  • 윤지훈;정인국;이중섭;정경택;서정세
    • 한국기계가공학회지
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    • 제10권6호
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    • pp.122-127
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    • 2011
  • In this study, it was compared collecting performance according to contact types between heatpipe and manifold of vacuum tube type solar collector. Between two types, direct contact type is better in collecting performance. On the other hand, Indirect type have advantage in maintenance. In the result of numerical analysis, As the temperature of heatpipe and flow rate of working fluid increased, difference of outlet mean temperature of two types became large. Also, it could be confirmed, as contact resistance between heatpipe and copper tube in indirect type increased, the difference increased too. Useful data in selection and design in vacuum tube type solar collector were proposed by the results of numerical analysis.

온도측정에 의한 히트파이프의 수명예측 (Prediction of Life of Heat Pipes by Measuring Temperature Distribution)

  • 신흥태;;이윤표
    • 대한기계학회논문집B
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    • 제23권7호
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    • pp.856-863
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    • 1999
  • The thermal performance degradation of heat pipes is caused by the non-condensable gas generation mainly due to the electrochemical corrosion which results from the reaction of working fluids with tube materials. In this study, a simplified method described below was proposed to estimate the life of heat pipes concerning the non-condensable gas generation. The temperature distributions at the outer surface of heat pipes was measured, and based on them the amount of non-condensable gas of hydrogen was estimated. Applying it to the Arrhenius model, the mass generation of hydrogen and the volume occupied by the gas In heat pipes could be estimated for an operating temperature and time. Moreover, this simplified method was applied to the accelerated life test of nine methanol-stainless steel heat pipe samples.

나노유체를 이용한 히트파이프 핫척의 열적 특성 (Thermal characteristics of Nanofluidic Heatpipe Hot Chuck)

  • 임택규;이석호;김대현;이충구
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2008년도 추계학술대회B
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    • pp.2110-2115
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    • 2008
  • In this study, We disigned and manufactured the Hot Chuck which can be operated until $120^{\circ}C$. Its shape is circular, wide is 300mm and depth is 15mm. Two types working fluid was used as working fluid(distilled water, 0.1%-$TiO_2$ nanofluid). The experimental results were compared to each working fluid. The effect of various working fluid, charging volume ratio was investigated. Also we investigated heat transfer rate against each working fluid. By using nanofluid, heat transfer rate can be enhanced and the wick structure can be constructed automatically on smooth surface. The experiment of 40% charged 0.1%-$TiO_2$ nanofluid showed the best performance of thermal accuracy and uniformity. To improve performance of Hot Chuck, more study is needed.

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히트파이프 성능예측 열전달계수 측정 (Measurement of The Thermal Transfer Coefficient Predicting Efficiency of The Heat Pipe)

  • 임수정;문종민;이광훈
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2008년도 추계학술대회B
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    • pp.2039-2042
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    • 2008
  • Recently, Electronic & Electrical Products have problems how to reduce heat in trend reducing size and increasing speed. heat pipes worked by latent heats can solve problems for effective and quiet electronic applications. Heat Pipes have to be suitably designed for the external conditions due to showing optimum performance. it has influence on efficiency of heat pipes to the exterior structure changed by length, bending angle, diameter. Designing heat pipes has depended on experience from trial and error. this method wasted too many resources, but can't guarantee efficiency. to prevent those wastes, this study aims at making the thermal transfer coefficient predicting efficiency. In this study, the thermal transfer coefficient has been made from experimental results that used variables - lengths between heat source and radiation, bending angles, diameters of heat pipes. variables become non-dimensional in modeling process for making the coefficient.

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평판형 히트파이프의 표면온도 분포에 관한 실험적 연구 (An Experimental Study of surface temperature distribution in Flat-Plate Heat Pipe)

  • 주상현;이영수;나호상;조성환
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2007년도 동계학술발표대회 논문집
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    • pp.635-639
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    • 2007
  • In this study, optimal design and test of flat-plate heat pipe were carried out in order to improve both thermal response and surface temperature uniformity of heating plate. Experimental results show that the thermal response of flat-plate heat pipe is faster than that of a conventional heating type ones along with less weight and cost. The surface temperature uniformity is also improved.

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조합형 윅을 사용한 히트파이프의 작동특성에 관한 실험적 연구 (Experimental study on the working characteristic of a heat pipe with combined wick)

  • 홍진관;부준홍;정원복
    • 설비공학논문집
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    • 제11권2호
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    • pp.236-243
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    • 1999
  • Aluminum/Freon-22 heat pipes were manufactured and tested which have a special wick geometry combining axial groove and screen mesh. There were 14 axial grooves in a cross-section and these were covered by two layers of 350 mesh screens to enhance the thermal performance. The performance test was conducted by varying the thermal load and tilt angle. Furthermore, the operation limits and overall heat transfer coefficient were investigated. The experimental results will be useful in a variety of applications, especially in design and manufacturing of a high-efficiency heat exchanger and energy recovery systems.

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확관 응축부를 갖는 진공관형 태양열 집열기용 히트파이프 성능 비교 연구 (A Comparative Study of Heat Pipes with Enlarged Condenser Section for Evacuated Solar Collectors)

  • 부준홍;정원복;곽희열
    • 한국태양에너지학회 논문집
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    • 제22권4호
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    • pp.18-25
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    • 2002
  • For application to medium temperature solar collerctors $(80\sim120^{\circ}C)$, a heat pipe should be designed properly to efficiently transfer heat to a hotter condenser than common applications. Among many wick structure candidates for heat pipes of this type, a slab wick was selected based on promising performance data reported previously. The thermal performance of slab wick heat pipes, screen wick heat pipes and thermosyphons with enlarged condenser section were experimentally investigated for comparison purpose. The heat pipes were 8.0 mm O.D. (evaporator section) and 25.4 mm O.D. (condenser section) made of copper. The experimental data of the heat pipes were analysed in terms of thermal resistance against thermal load and coolant temperature.

소결윅 특성이 히트파이프의 열수송 한계에 미치는 영향 (Effects of the Sintered Wick Characteristics on the Heat Transport Limitations of the Heat Pipes)

  • 김근배;김유
    • 한국군사과학기술학회지
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    • 제9권2호
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    • pp.127-135
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    • 2006
  • Experimental studies of the cylindrical sintered-copper wick heat pipes were carried out to investigate the capillary heat transfer characteristics. Six models of the sintered-copper wick heat pipes were manufactured and tested to evaluate the heat transport limitations and the thermal characteristics. Also the performance of the heat pipes was analyzed theoretically and compared with the test results. The heat pipe models are divided into two sintered-wick groups and the nominal particle sizes are $180{\mu}m$(wick #1) and $200{\mu}m$(wick #2) respectively The experimental results showed that, the porosity of wick #1 was higher than that of wick #2, and also the wick #1 was generally superior than the wick #2 for the heat transport capability. The maximum heat transport rates were increased as the wick thicknesses and the vapor temperatures were increased.

히트파이프를 부착한 구동모터의 냉각성능에 관한 연구 (Investigation of Cooling Performance of the Driving Motor Utilizing Heat Pipe)

  • 이동렬
    • 동력기계공학회지
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    • 제10권4호
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    • pp.11-16
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    • 2006
  • This research is to verify the cooling effect of the acting surface on the rotary motor using heat pipe and conventional cooling fan. In order to show the cooling performance of the rotary motor and heat pipe with the fin-typed heat sink, the surface temperature of the motor and condenser was measured in real time. The experiments were also conducted as for not only cooling device installed with heat pipe only, but with heat pipe and conventional cooling fan simultaneously. The present experiment reveals that the cooling combination of the heat pipe and cooling fan is far superior to the conventional cooling device for the driving motor such as the fin-typed heat sink. When the driving voltage of 20V and 14V were supplied to the driving motor, the cooling performance of the rotary motor with heat pipe was 170% and 500%, respectively better than that without heat pipe on steady state condition.

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히트파이프를 이용한 매스콘크리트의 수화열 제어에 관한 실험 연구 (An Experimental Study on the Hydration Heat Control of Mass Concrete Using Heat Pipe)

  • 백동일
    • 한국해양공학회지
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    • 제21권6호
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    • pp.81-86
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    • 2007
  • In order to eliminate the hydration heat of mass concrete, this paper reports the results of hydration heat control in mass concrete using the OCHP (Oscillating capillary tube heat pipe). In the summarized results of the mock up experiments, distributing the heat pipe at 300 mm intervals based on the center of the test specimen was the most effective. A 200 mm turn interval for the heat pipe was measured to be the most appropriate, taking into account the reinforcement placing at the actual site. Therefore, when the hydration heat control method using the heat pipe developed in this study is applied, not only canconstruction efficiency & a reduction in the necessary construction time be expected, but so can outstanding economical effects.