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Only recently few Far East companies have started to experimentally investigate the possibility of using the “nanolubricants” in refrigeration compressors in particular for the compressor typologies, like scroll ones, which efficiency is more affected by the lubricant performance. Lee et al. (2006) investigated the behaviour of the thrust slide-bearing of a scroll compressor with R22 and mineral oil with carbon nano particles added. The Authors found out experimentally that the nano particles (0.1 mass percentage in oil) increase up to 225% the breaking pressure of the oil film. The cooling performance of the contact surfaces was shown to be by far more efficient than the pure oil. The friction coefficient with pure oil was found to be higher than the one with oil+nano-particles. As an outcome, the wear of the surfaces in contact after several working hours was measured to be lower with the “nano lubricant”. Furthermore, the addition of carbon or copper oxides or aluminium oxides or titanium oxides nano particles to liquids is recognised to improve significantly the single-phase HTC in several applications (the behaviour in two-phase applications is still a much debated question). The very “intriguing” hypothesis is then: since the addition of nano particles is expected to improve significantly the lubricant performance in terms of compressor reliability and efficiency, should we expect also that the nano particles induce in the lubricant also an improvement in the heat transfer performance, as it happens when adding the same particles to liquids? If this should occur, the circulating oil could be an opportunity for increasing refrigerating machines efficiency, rather than a source of concerns for the engineers. List of Acronyms HTC: Heat Transfer Coefficient POE PolyOlEster MO: Mineral Oil PAG PolyAlchilenGlycol OCR Oil Circulation Ratio References Cremaschi L., Hwang Y., Radermacher R., 2005, Experimental investigation of oil retention in air conditioning systems, Int. J. Refrigeration, 28: 1018-1028. Field B. S., Hrnjak P., 2006, Pressure drop of two-phase refrigerant-oil mixtures in a small channel, 11th Int. Refr. Air-Conditioning Conf., R148: 1-8. Hwang Y., Lee J-P., Radermacher R., 2007, oil distribution in a transcritical CO2 air-conditioning system, Appl. Therm. Eng. (in press) Kedzierski M. A., 2001, The effect of lubricant concentration, miscibility, and viscosity on R134a pool boiling, Int. J. Refrigeration, 24(4): 348-366. Kedzierski M. A., 2007, Effect of refrigerant oil additive on R134a and R123 boiling heat transfer performance, Int. J. Refrigeration, 30: 144-154. Lee J. K., Kim H. S., Lee B. C., Park J. S., 2006, Performance evaluation of nano- lubricants at thrust slide-bearing of scroll compressors, 11th Int. Refr. Air-Conditioning Conf., C023: 1-8. Liu G., Li X., Fan R., 2004, Enhancing AW/EP property of lubricant oil by adding nano Al/Sn particles, Tribology letters, 18(1): 85-90.PDF Image | Circulating lubricant and effects of refrigeration circuits
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