介绍了几种三效溴化锂吸收式制冷循环，并利用计算机对其模拟优化，认为双冷凝器耦合的串联和并联（ＤＣＣＳＡ、ＤＣＣＰ）循环比较适合我国国情；研制了三效机样机，分析了机组变工况运行数据，较为详细地阐述了ＤＣＣＳＡ和ＤＣＣＰ循环特性，指出它们与双效机在设计、运行、控制方面的差异。 Several kinds of three-effect lithium bromide absorption refrigeration cycle are introduced and simulated by computer. The DCCSA and DCCP circulation are considered to be more suitable for our national conditions. The prototype of three-effect machine is developed and analyzed. Variable operating conditions data, a more detailed description of DCCSA and DCCP cycle characteristics, pointing out that they and double effect machine in the design, operation, control differences.