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本文以节能和保护臭氧层为目标，研究以自然工质丙烷（Ｒ２９０）替代Ｒ２２的理论与实际应用的问题。本文首先利用数值解法编程计算了以丙烷为工质的小型制冷系统毛细管的长度，为以丙烷为工质的小型制冷系统毛细管的选择建立一定的理论依据。再以丙烷和Ｒ２２的热物性和理论循环分析为基础，在相应的小型制冷系统上进行了一系列的实验，结果表明：丙烷是一种很好的替代工质。另外，本文还对丙烷的可燃性进行了研究探索，提出了在丙烷中加入少量非可燃物以降低其可燃性的设想，并进行了相应的可燃性实验，结果表明：在丙烷中加入少量非可燃物可部分抑制其可燃性。
In order to save energy and protect the ozone layer, this paper studies the theory and practical application of replacing R22 with natural refrigerant propane (R290). In this paper, the length of the capillaries of a small refrigeration system using propane as the working fluid is calculated and calculated by numerical solution firstly, and a certain theoretical basis is established for the selection of the capillaries of a small refrigeration system using propane as the working fluid. Based on the thermophysical properties and theoretical cycle analysis of propane and R22, a series of experiments were carried out on corresponding small refrigeration systems. The results show that propane is a good substitute for working fluid. In addition, this paper also explores the propane flammability, propane proposed to add a small amount of non-flammable to reduce its flammability of the idea, and the corresponding flammability test results show that: adding a small amount of non-propane Combustibles can partially suppress their flammability.