Due to the great potential of propane in environmental protection and thermodynamic properties, the promotion of propane room air conditioner will make a great contribution to environmental protection. The defrosting behaviors of propane room air conditioner system and rotary compressor were studied by experiments in this paper. Experimental analysis redefines and distinguishes defrosting time and frost melting time, and their relationship with condition temperature is different. The experimental results show that the lower the ambient temperature was, the longer the defrosting time was, but the shorter the frost melting time on the outdoor heat exchanger was. The state of the oil sump and foam layer in propane rotary compressor using Mineral Oil (MO) was recorded and the variation reason for liquid level was analysed during defrosting. Combined with the change of viscosity and liquid level of the oil sump, the experimental results show that the compressor has abnormal oil discharged, and the lower the ambient temperature was, the larger the oil discharge was under three conditions during defrosting process. The total mass of the mixture in the oil sump under the three working conditions is 275.18 g, 289.10 g and 276.41 g, the lubricating oil is 202.97 g, 200.23 g and 189.71 g, and the refrigerant mass is 72.21 g, 88.87 g and 86.71 g respectively when the defrosting process ended. This study will provide an experimental basis of the reliability study and application of propane air conditioners.

由于丙烷在环保和热力学性能方面的巨大潜力，丙烷房间空调的推广将为环境保护做出巨大贡献。本文通过实验研究了丙烷房间空调系统和旋转压缩机的除霜行为。实验分析重新定义和区分了化霜时间和融霜时间，它们与工况温度的关系是不同的。实验结果表明，环境温度越低，除霜时间越长，但室外换热器的融霜时间越短。记录了使用矿物油（MO）的丙烷回转式压缩机油底壳和泡沫层的状态，并分析了除霜过程中液位变化的原因。结合油底壳黏度和液位的变化，实验结果表明，压缩机出现异常排油现象，环境温度越低，除霜过程中三种工况的排油量越大。三种工况下油底壳中混合物的总质量分别为275.18g、289.10g和276.41g，润滑油为202.97g、200.23g和189.71g，制冷剂质量为72.21g、88.87.1g和88.87g g 分别在除霜过程结束时。本研究将为丙烷空调的可靠性研究和应用提供实验依据。除霜过程中三种情况下的排油量越大。三种工况下油底壳中混合物的总质量分别为275.18g、289.10g和276.41g，润滑油为202.97g、200.23g和189.71g，制冷剂质量为72.21g、88.87.1g和88.87g g 分别在除霜过程结束时。本研究将为丙烷空调的可靠性研究和应用提供实验依据。除霜过程中三种情况下的排油量越大。三种工况下油底壳中混合物的总质量分别为275.18g、289.10g和276.41g，润滑油为202.97g、200.23g和189.71g，制冷剂质量为72.21g、88.87.1g和88.87g g 分别在除霜过程结束时。本研究将为丙烷空调的可靠性研究和应用提供实验依据。