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介绍了国外的三效吸收式制冷和热泵循环的研究概况，对其所适用的工况、热力性能及其工质的研究进展进行了综述，指出了使三效机组具有竞争力迫切需要解决的一些问题。
The research status of the three - effect absorption refrigeration and heat pump cycle in foreign countries is introduced. The applicable conditions, thermal properties and working conditions of the three - effect absorption refrigeration cycle are reviewed. The problems that make the three - effect unit competitive are urgently needed some problems.