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윤점열,이관수,김현영,강희찬,Yun, J.Y.,Lee, K.S.,Kim, H.Y.,Kang, H.C. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.2
This study is to systematically analyze the effect of various kinds of design parameters on heat transfer and pressure drop characteristics of heat exchanger with a slit fin. TAGUCHI method, known to us as a very reasonable tool in the parametric study, is employed in the present work. Experimental factors have been limited to seven cases, considering the production of sample and the cost. The 18 kinds of large scale models are made by compounding level on each factor and the heat transfer and flow characteristics on each model has been analyzed. The present results allow us to be able to quantitatively estimate the various parameters affecting the heat exchanger performance, and main factors for an optimum design of a heat exchanger have been selected. The optimum design value on each parameter was presented and the reproducibility on the results was guaranteed.
전열관 형상과 냉동기유 효과를 고려한 공조기기의 성능예측
윤점열,이관수,이동진,Yun, J.Y.,Lee, K.S.,Lee, D.J. 대한설비공학회 1994 설비공학 논문집 Vol.6 No.4
Computer simulation model for predicting more accurately the heat transfer performance of the evaporator and condenser which have significantly affected on the performance of air-conditioner has been suggested. In this model oil and micro-fin tube used in a actual unit are considered to simulate the more realistic case. The effects of oil and micro-fin tube on the performance of an air-conditioner have been investigated. It is found that the present model requires higher pressure than the existing model due to the characteristics of the tube considered. However, it turns out that the present model is very close to an actual cycle. As the amount of oil inside the tube increases, condensation heat transfer coefficient shows a linear decrease irrespective of a kind of oil, while evaporation heat transfer coefficient increases slightly in the oil with low viscosity and decreases exponentially in the oil with high viscosity. Pressure drop in both evaporator and condenser increases linearly irrespective of a kind of oil. It is also found that the effect of the variation of oil concentration on the magnitude of two-phase region is negligible.