Abstract
A compressor rupture accident may occur because of erroneous operation during the pump-down of residential split air conditioners. An engine for a model airplane was used to simulate a refrigerant compressor, and experiments were conducted on the diesel combustion of mixtures of refrigeration oil, refrigerant, and air. The effect of the reaction inhibitor concentration in the refrigeration oil on combustion suppression was investigated. The refrigeration base oil used was polyol ester oil, and the additives were phenolic antioxidants (A1), epoxy stabilizers (A2), and phosphorus antiwear agents (P1). The refrigerants used were R22, R32, R1234yf, and R290. R22 is old and non-flammable; however, it was selected because it is the refrigerant with the most reports of compressor explosion accidents. R1234yf is not currently used in split air conditioners, but a mixture of R32 and R1234yf may be used in the future; therefore, R1234yf was chosen. The combustion range became narrower and the maximum pressure decreased as the concentration of the additive increased. Additive A2 showed a suppression effect on many refrigerants even when 1 wt% was added. In particular, for R290 and R1234yf, the concentration range of diesel explosions was significantly reduced.
Published Version
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