• 제목/요약/키워드: 루프형 2상 유동 열사이폰

검색결과 4건 처리시간 0.016초

루프형 2상 유동 열사이폰의 유동 불안정에 관한 실험적 연구 (Experimental Study on Instability of Two-Phase Loop Thermosyphon)

  • 이석호
    • 설비공학논문집
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    • 제14권5호
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    • pp.408-414
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    • 2002
  • The instability of two-phase loop thermosyphons (TLTs) was investigated experimentally. Three orifice type inserts were used to study the effect of change in the pressure drop in the flow channel of the TLT on the flow instability and temperature fluctuation. It is observed that a decrease in the size of the orifice insert from 3.7mm (no insert) to 0.71mm drastically reduced the fluctuation of the temperature, especially at the evaporator section of the TLT With the orifice type insert of 0.71 mm for the TLT, the overall temperature fluctuation was almost completely eliminated, especially at higher power input to the TLT.

다양한 규모의 루프형 2상 유동 열사이폰의 시뮬레이션 (Simulation Study on Various Scale of Two-Phase Loop Thermosyphons)

  • 이석호;이기우
    • 설비공학논문집
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    • 제14권5호
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    • pp.398-407
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    • 2002
  • An experimental and analytical study was made on the heat transfer characteristics of one small (150 W), two medium (60 and 1,500 W, respectively) and two large (7,500and 100,000 W) two-phase loop thermosyphons (TLT), and the results from the experiments were used to see if a computer simulation code alone for such TLT heat transfer systems would give any meaningful quantitative results without being accompanied with some benchmark experimental verification. Two simulation methods were used for the analysis of the systems, i.e., the lumped and the sectorial thermal resistance methods. The study clearly shows that the computer simulation for the three TLTs can predict the most cases of the affecting parameters involved, provided that correct empirical correlations are used. To do so, however, the interior temperature distribution had to be verified by experiment.

루프형 2상 유동 열사이폰 열교환기에 관한 연구 (Study on Two-Phase Loop Thermosyphon Heat Exchanger)

  • 이기우;박기호;이석호
    • 설비공학논문집
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    • 제14권9호
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    • pp.717-724
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    • 2002
  • A heat exchanger (100,000 W) using two-phase loop thermosyphons (TLT) was developed as a waste heat recovery system. An experimental and simulation study was carried out on the heat transfer characteristics of TLT heat exchanger, and the results from the experiments were used to see the possibility which the TLT heat exchanger could be an alternate solution for waste heat recovery system. The experimental results showed the provisional results as a waste heat recovery system. Also computer simulation code can predict the TLT system about the effects of various variables for the operation. Computer simulation results based on the thermal resistance networks were compared with the experimental results. The study clearly shows that the computer simulation for the TLT heat exchanger can Predict the most cases of the affecting parameters involved, provided that correct empirical correlations are used.

나노유체를 이용한 2상유동 2성분 루프형 열사이폰 (Two-Phase Two-Component Loop Thermosyphon with Nanofluid)

  • 이석호;박종찬;차경일;임택규;이충구;신동륜;박기호
    • 설비공학논문집
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    • 제18권5호
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    • pp.384-392
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    • 2006
  • Reported are the heat transfer characteristics of a two-phase loop thermosyphon (TLT) with nanofluids consisted of nano-size silver particles and distilled water as the working fluid. The nanofluids used in the present study are dispersed solutions with various amount of silver nanoparticle in distilled water. It is seen from the present study that the heat transfer performance of the test TLT with nanofluids increased as much as about 2 times higher than that of a TLT with pure water as the working fluid based on same heat flux. The study also showed that there was no deterioration of the TLT performance with time, up to a period of 8 days of continuous operation which implies that there was no coagulation of nanoparticles within the working nanofluid during the operation of the test TLT.