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장주찬(Ju-Chan Jang),이석호(Seok-Ho Rhi),이충구(Chung-Gu Lee) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.4
Experimental studies on single-phase toroidal circulation loop(thermosyphon) have been performed in the present study with Ag-nanofluids as a working fluids. The present paper deals with an experimental study on the heat transfer behavior of single-phase toroidal loop. Toroidal loop charged with nanofluid has been constructed and a number of tests have been carried out. Different geometric parameter, e.g., orientation has been investigated. The tests were conducted employing two fluids: distilled water and Ag-nanofluid of various volume concentrations. The experiments at Rayleigh number from 10? to 10? showed a systematic and slight deterioration in natural convective heat transfer. It was observed that the deterioration due to the particle concentration was in the range of 5-10%. At a given particle concentration of 0.05%, abrupt decrease in the Nusselt number and the Raleigh number was observed. The present study with toroidal loop shows that the application of nanofluids for heat transfer intensification should not be decided only by the effective thermal conductivity with increasing particle concentration.
장주찬(Ju-Chan Jang),이석호(Seok-Ho Rhi),김선국(Sun-kook Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The present research investigated the battery thermal management for future electric/hybrid vehicle. The experimental system for the thermal management of a Li-ion battery system was designed for a future hybrid and electric vehicles. Specially, the present thermal management system has adopted a loop type heat pipe cooling method for high efficiency cooling. In the present study, the experimental results show that the present heat pipe system is able to transfer the entire dissipated heat and each cell temperature is maintained under 50℃ when each cell of battery give off 50 watt of heat. Hence, battery module temperature uniformity is one such parameter and the optimum operating range is different. We then carried out the experimental study with loop type heat pipe cooling system in battery thermal management system.
평판형 증발부를 갖는 루프히트파이프의 열유동 및 보상챔버의 역할
이석호(Seok-Ho Rh),김용만(Yong-Man Kim),장주찬(Ju-Chan Jang),황규동(Kyu-Dong Hwang),이충구(Chung-Gu Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
The present study carried out experimental and analytical study of a Loop Heat Pipe(LHP), employing various working fluids, different system orientation modes and so on. This paper presents a LHP employed micro ceramic wicks and various working fluid such as Ammonia, Water and R-134a are used as working fluid. We observed how LHP was affected by different compensation chamber temperature and system mode. The best perpermance was achieved from CC-mode with R-134a. Futhermore, we simulated LHP in each various environments. As a result, an important fundamental data required for the establishment of the theoretical prediction of LHP performance was obtained.
사각 평판 증발부를 갖는 루프히트파이프에서의 마이크로 열유동
이석호 ( Seok O Phi ),김용만 ( Yong Man Kim ),장주찬 ( Ju Chan Jang ),이충구 ( Chung Gu Lee ),황규동 ( Kyu Dong Hwang ) 충북대학교 산업과학기술연구소 2010 산업과학기술연구 논문집 Vol.24 No.2
The loop heat pipe technology in future space, electronics cooling, automotive and other various fields requires careful design considerations of certain variables related to the loop operation in regard to the heat transport, geometry and selected working fluid. In the present research, the experimental and simulation studies have been carried out to obtain the optimum design characteristics in the construction of loop heat pipe which has the rectangular evaporator and the compensation chamber. The present loop heat pipe have been built and tested, where they differ from each other on their compensation chamber geometry and working temperature. In the present study, the working fluids were R-134a and water in substitution of the conventional ammonia. The present study presents a loop heat pipe(LHP) employed micro ceramic wicks in the evaporator to make working fluid circulation. We observed how LHP was affected by different compensation chamber temperatures and system orientation modes. The best performance was achieved from CC-mode with R-134a. Futhermore, the simulation results by thermal resistance network model agree with the experimental results.