Comparisons of Nu correlations for H2O/LiBr solution in plate heat exchanger for triple effect absorption chiller application
2019
Song, Joo Young | Lee, Jae-won | Kang, Yong Tae
In this study, heat transfer characteristics of single-phase Water/Lithium Bromide (H2O/LiBr) solution in a plate heat exchanger (PHE) is evaluated for absorption chiller applications. The plate heat exchanger is arranged with single-pass and counter flow, and the chevron angle of corrugated plate is a high theta of 78.5°. The H2O/LiBr solution is used as working fluid with wide mass concentration ranging between 52.40% and 64.92%, Reynolds number ranging between 27.29 and 255.1 and Prandtl number ranging between 4.59 and 19.26. All of experiments are conducted within ±10% energy balance error range. It is found that the convective heat transfer coefficients range from 0.68 kW/m2·K to 2.92 kW/m2·K. Based on the experimental data, empirical Nusselt number correlation of the H2O/LiBr solution in the 78.5° plate heat exchanger is developed within ±20% error range. The Nusselt number correlation of the present study is applicable to predict the heat transfer characteristics of the H2O/LiBr solution with a wide range of LiBr concentration for triple effect absorption chiller applications.
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