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이용화(Y.H.Lee),이동호(D.H.Rie),카시와기타카오(T.Kashiwagi),서정윤(J.Y.Seo) 한국태양에너지학회 1995 한국태양에너지학회 논문집 Vol.15 No.1
본 연구는 H₂0/LiBr 과 NH₃/ H₂O계를 사용하는 2단2원 흡수식 사이클의 특성에 관한 연구이다. 이 사이클은 2개의 단효용 사이클로 이루어져 있으며, 저온단의 흡수기와 응축기에서 얻어진 열을 고온단의 증발기에서 이용하는 사이클로서 저온단의 증발기 및 응축기의 온도, 재생기 온도, 열교환 온도차를 파라메터로 하여 계산한 결과 다음과 같은 결론을 얻었다. 2단2원사이클의 성립범위를 확인하였으며 본 계산조건에서 50~70℃의 승온폭을 얻을 수 있었다. 또한 50℃의 난방온도를 얻기위한 최적재생온도는 105℃, 최대 COP를 얻기위한 저온측사이클의 응축압력은 16℃, 그리고 이 조건에서 저온측 사이클으 응축압력을 단효용 사이클의 경우보다 낮게 억제하는 것이 가능함을 알았다. This paper concerns the study of a two-stage binary absorption cycle employing the refrigerant/ absorbent combinations of LiBr / H₂0 and NH₃/ H₂O. This cycle consists of coupling two single-effect absorption cycles so that the first stage absorber and condenser produces heating water to evaporate refrigerant in the evaporator of the second stage. The effect of operating variables such as evaporator temperature, condenser and absorber temperature, and generator temperature on the coefficient of performance and temperature lift have been studied for two-stage binary absorption heat pump systems. It is found that this cycle has a large temperature lift at 105℃ of optimum generator temperature to obtain 50℃ of condenser temperature.
증기흡수시(蒸氣吸收時) 계면활성제액적간(界面活性劑液滴間)에 발생(發生)하는 마랑고니대류거동(對流擧動)의 가시화(可視化)
이동호,최국광,백목효부,서정윤,Rie, D.H.,Choi, K.K.,Kashiwagi, T.,Seo, J.Y. 대한설비공학회 1992 설비공학 논문집 Vol.4 No.2
In most absorption machines, absorption enhancement has been achieved by adding small amount of surfactant additive, which introduced the surface tension difference between absorbent and surfactant droplets in the vapor absorption. The aim of this study is to understand a basic mechanism of Marangoni convection and its effectiveness in the vapor absorption enhancement. In this study, nonflowing aqueous solution of LiBr 60 mass% was exposed to saturated water vapor under the condition that two dropwises surfactant were fixed on the absorbent surface. Our experiments achieved to visualize the enhanced heat and mass transfer phenomena by the effect of Marangoni convection through the laser holographic interferometry. Also, Marangoni convection behavior was obtained by using tracer method.
低溫再生器2熱源2重效用 Series Flow Cycle의 特性 解析 (第1報 電熱特性)
이동호(D. H. Rie) 한국태양에너지학회 1996 한국태양에너지학회 논문집 Vol.16 No.4
本 硏究는 低溫再生器에서 溶液 再生 熱源으로 低溫熱을 補助熱源으로 利用가능한 2熱源 2重效用 吸收 사이클特性을 糾明하기 위한 첫단계로서 直列溶液循環型 2重效用 吸收사이클 解析이다. 本 解析은 低溫 再生器에서 必要한 再生熱의 一部를 太陽熱 또는 排熱 등과 같은 低溫 補助 加熱源을 利用하여 熱의 有用性 檢證을 위한 基礎 手段으로 加熱源 入口 溫度, 溶液 循環量을 變化시켜 2重效用 吸收 사이클 效率 및 蒸發器, 吸收器, 凝縮器, 溶液 熱交換器의 KA 變化에 따른 傳熱特性에 대해 把握함을 目的으로 한다. A double-effect simulation model is applied to a Lithium-Bromide/water system, with the objective of evaluating the possibilities of effectively utilizing waste-heat as a secondary heat source for the low-temperature generator. In this study, cycle simulation has been carried out to clarify the effect of heat exchange in order to predict the performance of absorption refrigeration cycles using waste heat.
수직관내(垂直管內)를 흘러내리는 액막식(液膜式) 흡수기(吸收器)의 흡수(吸收) 및 열전달특성(熱傳達特性)(제(第)2보(報) 열전달특성(熱傳達特性))
엄기찬,이동호,최국광,카시와기 타카오,서정윤,Ohm, K.C.,Rie, D.H.,Choi, G.G.,Kasiwagi, Takao,Seo, J.Y. 대한설비공학회 1993 설비공학 논문집 Vol.5 No.4
This is the second report of a three part study on the absorption and heat transfer characteristics of absorber, the correlation of refrigerating capacity and heating capacity. The 2nd report deals with the heat transfer characteristics of a vertical falling film type absorber of inner copper tube. The solute is LiBr-Water solution(60wt%) and the solvent is water vapor. The film Reynoles numbers are varied in the range of 35~130. The states of LiBr solution at the top of absorber are supercooled liquid and superheated liquid. The results are summarized as follows ; Heat transfer results reveal that for the absorption of falling film, the state of LiBr solution appears to be influential in determining the heat transfer. Thus, for the state of supercooled liquid, heat transfer coefficient decreases with increasing the film Reynolds number, but in the condition of superheated liquid, it increases conversely. The mass transfer coefficients that were presented in the 1st.report and heat transfer coefficients of this paper are presented as the dimensionless correlation. The optimum water flowrate which brings about maximum value of heat flux in the film exists, and that increases with increasing the cooling water temperature.
저온재생기 2열원 2중효과 Parallel Flow Cycle의 특성해석
최국광(K.K.Choi),이동호(D.H.Rie) 한국태양에너지학회 1997 한국태양에너지학회 논문집 Vol.17 No.3
본 연구는 저온재생기에서 용액 재생 열원으로 저온열을 보조열원으로 이용가능한 2열원 2중효용흡수 사이클특성을 규명하기 위한 방법으로 병렬 용액 순환형 2중 효용 흡수 사이클 해석을 수행한다. 본 해석은 저온 재생기에서 필요한 재생열의 일부를 태양열 또는 배열 등과 같은 저온 보조 가열원을 이용하여 열의 유용성 검증을 위한 기초 수단으로 가열원 입구 온도, 용액 순환량을 변화시켜 2중효용 parallel flow cycle의 특성을 규명한다. Cycle simulation of the double effect parallel flow mxle1 is applied to a lithium-Bromide/water system, with the objective of evaluation the possibilities of effectively utilizing waste-heat as a secondary heat source for the low-temperature generator. In this study, cycle simulation has been carried out to clarify the effect heat exchange in order to predict the performance of absorption refrigeration cycles using waste heat.
이동호,신현준,유지오 한국산업안전학회 1999 한국안전학회지 Vol.14 No.4
In this study, the computer code for the optimal design of road tunnel ventilation system based on one-dimensional analysis of the air flow was developed. The control volume method was used to calculate the air velocities and the concentration distribution of pollutants(CO, NOx, Particulate) for various tunnel ventilation system. This code was validated by comparing the calculation results to the practical design data for the road tunnel ventilation system. The calculation results were in accord with the practical design data.