Refrigeration TechnologyRefrigeration Technology0023-124X2782-4241Eco-Vector9836810.17816/RF98368Research ArticleBezmaslyanye sistemy na R744 dlya promyshlennogo i kommercheskogo kholodaHafnerA.Armin.Hafner@sintef.noNeksaP.-LadamY.-EIKEVIKT. M-1511201210111202325012022Copyright © 2012, Hafner A., Neksa P., Ladam Y., EIKEVIK T.M.2012безмасляный компрессорхолодильная система на R744центробежный компрессорпромышленный и торговый холод[Dang, C., N. Haraguchi and H.E. Yamada. Effect of lubricant oil on boiling heat transfer of carbon dioxide. in 7th IIR-Gustav Lorentzen Conference. 2006. Trondheim, Norway.][Dang, C., K. Lino and K. Hihara. Effect of PAG-type lubricating oil on heat transfer characteristics of supercritical carbon dioxide cooled inside a small internally grooved tube. International Journal of Refrigeration, 2010. 33.][Hambraeus, K. 1995. Heat transfer of oil-contaminated HFC134a in a horizontal evaporator. International Journal of Refrigeration, 18(2).][Gao, L., T. Honda and S. Koyama. Experiments on flow boiling heat transfer of almost pure CO2 and CO2-oil mixtures in horizontal smooth and microfin tubes. HVAC&R Res, 2007. 13(3).][Gao, L. and T. Honda. Flow and heat transfer characteristics of refrigerant and PAG oil in the evaporator of a CO2 heat pump system. in 7th IIRGustav Lorentzen Conference. 2006. Trondheim, Norway.][Koyama, S. et al. Experimental study on flow boiling of pure CO2 and CO2-oil mixtures inside horizontal smooth and microfin copper tubes. in 6th IIR-Gustav Lorentzen Conference. 2004.Glasgow, UK.][Thome, J.R. 1995. Comprehensive thermodynamic approach to modeling refrigerant-lubricating oil mixtures. HVAC&R Research, 2.][Yamaguchi, H., Zhang, X.R., Fujima, K. 2008. Basic study on new cryogenic refrigeration using CO2 solid-gas two phase flow. International Journal of Refrigeration 31.][Youbi-Idrissi, M. and J. Bonjour. The effect of oil in refrigeration: Current research issues and critical review of thermodynamic aspects. International Journal of Refrigeration, 2008. 31(2). WO94/29597 Sketch of turbo compressor, as example.]