自1834年在伦敦工作的美国发明家波尔金斯(Perkins)造出了第一台制冷机以来,制冷技术已通过了一个半世纪的逐步发展。人们在不断地研究新型制冷循环,寻找各种新工质,发展新的制冷原理与机器结构。时至今日,制冷技术,特别是蒸汽压缩式制冷技术已发展到相当完善的地步。但直到最近几年,科学家才开始注意到一个严重 Refrigeration technology has evolved over a century and a half since the first chiller was manufactured by Perkins, the American inventor working in London in 1834. People are constantly studying new refrigeration cycle, looking for a variety of new working substance, the development of new refrigeration principles and machine structure. To date, refrigeration technology, especially steam compression refrigeration technology has been developed to a very perfect point. But it was only in recent years that scientists began to notice a serious one