对采用微通道管阵列的氨水吸收器进行了实验研究。液氨-水溶液以降膜模式在一组小直径冷却液管周围流动，而蒸汽则向上流经管阵列，与降膜形成逆流。之前对设计用于10.55 kW冷负荷（19.28 kW吸收器负荷）住宅热泵的吸收器进行的研究表明，该技术有潜力在不进行表面处理或强化的情况下实现较高的传热和传质速率，且溶液和冷却液压降相对较低。 然而，这些之前的综合分析和实验研究表明，溶液分布问题可能会导致所提供表面积的不完全利用。在本研究中，我们构建了一个具有光接入的吸收体，以便对原始吸收体的各种改进进行评估，尤其是溶液分配机制。实验覆盖了广泛的溶液和冷却剂流速以及蒸汽分数，以确定整体和溶液侧的传热传质系数。 研究发现，尽管改进后的吸收器的表面积仅为0.456 m2，约为原始原型吸收器表面积的30%，但它能够转移高达15.1 kW的负载，几乎等于原始较大吸收器的负载。性能的显著提高归功于流量分布的显著改善。该吸收器内流动的可视化记录也证实了显著改善的流动分布和表面在传热传质过程中的更高参与度。 单元:干燥:研讨会论文，加利福尼亚州阿纳海姆，2004年

An experimental investigation of an ammonia-water absorber that utilizes microchannel tube arrays was conducted. Liquid ammonia-water solution flows in the falling-film mode around an array of small diameter coolant tubes, while vapor flows upward through the tube array countercurrent to the falling film. Previous investigations of an absorber designed for use in a 10.55 kW cooling load (19.28 kW absorber load) residential heat pump demonstrated the potential of this technology for achieving high heat and mass transfer rates with no surface treatment or enhancement and with relatively low solution and coolant pressure drops. However, these previous integrated analytical and experimental studies indicated that solution distribution problems might be resulting in incomplete utilization of the provided surface area. In the present study, an absorber with optical access was constructed so that various improvements to the original absorber, including particularly the solution distribution mechanism, could be evaluated. Experiments covering a wide range of solution and coolant flow rates and vapor fractions were used to determine the overall and solution-side heat and mass transfer coefficients. It was found that although the surface area of this improved absorber was only 0.456 m2, approximately 30% of the surface area of the original prototype absorber, it was able to transfer duties as high as 15.1 kW, almost equaling the load of the original larger absorber. This significant increase in performance is attributed to the substantially improved flow distribution. Visual documentation of the flow in this absorber also confirmed the significantly improved flow distribution and higher participation of the surface in the heat and mass transfer process.Units: SI