1.前言在此特集发表之际,应邀为其写序,打算概述一下压缩机的重大演变过程,并进而涉及其今后的发展动向。过去,对于制冷量100吨以下和100吨以上的应用场合,只在往复式和透平式两种机型中加以选择。目前,冷冻用压缩机的确种类繁多,就连冷冻空调技术人员对其选择也感到茫然不知所措。 1. Preface When this special feature was published, it was invited to write an order for it, intending to outline the major evolution of the compressor and its future developments. In the past, the cooling capacity of 100 tons and below 100 tons and more applications, only in reciprocating and turbine two models to choose from. At present, there are indeed a large variety of refrigerating compressors, and even the refrigeration and air-conditioning technicians are at a loss what to do with their choices.