对于使用低温热源的溴化锂吸收式制冷机，可以采用降膜式发生器改善传热传质，提高机组的性能。本文提出了一个水平管束构成的降膜式发生器的数学模型，求得了传热传质特性的数值解，并以热水为热源对一个由８排水平管构成的发生器模型进行了试验研究，数值解和试验结果吻合程度较好，通过分析得出了有益于降膜式发生器传热传质的一些结论。 For the use of low-temperature heat source of lithium bromide absorption chiller, you can use the falling film generator to improve heat and mass transfer, improve the performance of the unit. In this paper, a mathematical model of the falling film generator consisting of horizontal tube bundles is proposed. The numerical solution of the heat and mass transfer characteristics is obtained. A generator model consisting of 8 horizontal tubes is studied with hot water as the heat source , The numerical solution is in good agreement with the experimental results, and some conclusions that are beneficial to the heat and mass transfer of the falling film generator are obtained through analysis.