In this study, single-phase H₂O/LiBr solution heat transfer and frictional pressure drop characteristics in plate heat exchangers (PHEs) with two different chevron angles are experimentally evaluated for triple-effect H₂O/LiBr absorption chiller applications. The test PHEs are single-pass exchangers with 20 plates. Chevron angles are 78.5° and 55.7° for high- and low-theta PHEs, respectively. Heat transfer and frictional pressure drop experiments in the PHEs were conducted with LiBr concentration ranging from 50.21% to 64.92% (which is the widest concentration range for triple-effect absorption application), solution Reynolds number from 19.39 to 479.10, and Prandtl number from 3.63 to 24.40. All experiments were conducted within a ± 3% energy balance error range, and the heat transfer and frictional pressure drop correlations are developed and applicable within ± 14% and ± 6% error ranges, respectively, by considering the effect of the chevron angle. The correlations developed in this study are compared with correlations from literature. Finally, it is found that the chevron angle of the PHE does not give a significant effect on the energy savings.

在这项研究中，单相H ₂中的板式换热器（板式换热器）具有两个不同的人字形角O /溴化锂溶液的热传递和摩擦压降特性实验评价为三重效应的H ₂O / LiBr吸收式制冷机的应用。测试的PHE是带有20个板的单程交换器。高和低θPHE的人字形角度分别为78.5°和55.7°。在PHE中进行传热和摩擦压降实验，其中LiBr浓度为50.21％至64.92％（这是三效吸收应用的最大浓度范围），溶液雷诺数为19.39至479.10，普朗特数为3.63至24.40。所有实验均在±3％的能量平衡误差范围内进行，通过考虑人字形角度的影响，建立了传热和摩擦压降相关性，并分别在±14％和±6％误差范围内适用。本研究中建立的相关性与文献中的相关性进行了比较。最后，