Abstract
To prevent compressor explosion accidents in a split air conditioner during pump-down operation, diesel compression combustion was experimentally investigated using a mixture of lubricating oil, refrigerant, and air. The effect of the concentration of additives in the lubricating oil on combustion suppression was investigated. The lubricating oil used was polyol ester oil, and the additives included phenolic antioxidant (A1) and phosphorus antiwear agent (P1). The refrigerants were R22, R32, R1234yf, and R290. The experimental results revealed that as the concentration of the additives increased, the combustion range became narrower and the maximum pressure decreased. Moreover, their suppression effects varied depending on the refrigerant. The pressure waveform changed before the combustion occurred, and it is speculated that the deformation of the pressure waveform was related to the refrigerant combustion.
Published Version
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