• Title/Summary/Keyword: 열전도 역산법

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Measurement of Critical Heat Flux Using the Transient Inverse Heat Conduction Method in Spray cooling (비정상 열전도 역산법에 의한 분무냉각 임계열유속(CHF)의 측정에 관한 연구)

  • Kim, Yeung Chan
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.40 no.10
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    • pp.653-658
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    • 2016
  • A study on the measurement of critical heat flux using the transient inverse heat conduction method in spray cooling was performed. The inverse heat conduction method estimates the surface heat flux or temperature using a measured interior temperature history. The effects of the measuring time interval and location of temperature measurement on the measurement of critical heat flux were primarily investigated. The following results were obtained. The estimated critical heat flux decreased as the time interval of temperature measurement increased. Meanwhile, the effect of measurement location on critical heat flux was not significant. It was also found, from the experimental results, that the critical superheat increased as the measurement location of thermocouple neared the heat transfer surface.

A Study of the Effect of Grouting Region on the Solution of Line Source Analysis (그라우팅 영역이 선형열원 해석에 미치는 영향에 관한 연구)

  • Lee, Se-Kyoun;Woo, Joung-Son;Ro, Jeong-Geun
    • Journal of Energy Engineering
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    • v.19 no.3
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    • pp.143-150
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    • 2010
  • Line source method of borehole system assumes the entire surrounding medium is uniform. However, thermal properties of grouting region are considerably different from those of surrounding soil. In this study we investigate the effect of grouting materials on the solution of line source method with the aid of numerical analysis. This numerical model generates the temperature of borehole fluid with which line source solution can be obtained. Then this solution can be compared with input condition of numerical model. The results of this comparison show that thermal conductivity and borehole thermal resistance of line source solution are approximately 86% and 91% of the input condition of numerical model. Chart method is developed in this study to find the numerical input conditions (thermal conductivity and borehole thermal resistance) from the line source solution. Thermal response test of test borehole is conducted, the results of which are approximately consistent with the Chart method. Thermal property changes of grouting materials on the line source solution are also examined.