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Prediction of CO<sub>2</sub> condensation heat transfer coefficient in a tube
Heo, Jaehyeok,Yun, Rin Elsevier 2015 INTERNATIONAL JOURNAL OF THERMAL SCIENCES Vol.89 No.-
<P><B>Abstract</B></P> <P>A prediction model of CO<SUB>2</SUB> condensation heat transfer coefficients was developed. The flow patterns in the present model were predicted by the Soliman model. The existing Thome et al. model was applied to predict heat transfer coefficients for the wavy-intermittent and annular flow. The modified Dittus–Boelter equation was utilized for the mist flow. Heat transfer coefficients in the annular-mist flow were calculated from the combination of models for the annular and the mist flow with the ratio of <I>We</I> number. The mean deviation of the present model with the experimental data of 589 points from seven different sources was 44.8%. The present model showed improved predictability compared to the existing models under high mass flux and high condensation temperature conditions, and with a small diameter tube.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CO<SUB>2</SUB> condensation heat transfer coefficient model was developed. </LI> <LI> Predictability under high mass flux and condensation temperature was improved. </LI> <LI> Mean deviation decreased with decreasing upper annular limit by <I>We</I> number. </LI> </UL> </P>
발전소 온배수 열회수를 위한 열교환기의 파울링 특성 및 예측
허재혁(Jaehyeok Heo),이동원(Dong Won Lee),김민휘(Min Hwi Kim),윤린(Rin Yun) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
Available heating energy from Domestic power plant effluent is about 465,182 Tcal, but only a few is used for fishing culture and agriculture and mostly release to the sea. Recently, the power plant heat effluent was included in new and renewable energy in Korea, and the rapid growth of the related research and market are expected. For efficient usage of heat effluent, sea water fouling is a important factor to overcome. In this research, general fouling characteristics in a heat exchanger were investigated and the performance degradation by sea water fouling was estimated.