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Surface tension, viscosity, and thermal conductivity of nanolubricants and vapour pressure of refrigerant/nanolubricant mixtures.

Number: pap. ID: 194

Author(s) : NIKITIN D., ZHELEZNY V., PRIHODCHENKO N., et al.

Summary

The results of thermophysical properties research of the refrigeration compressor lubricant (mineral oil ISO 9) with nanoparticles of MoS2 (70 nm) and Cu (50 nm), and measurements of vapor-liquid equilibrium for the refrigerant R600a/nanolubricant mixtures are presented. Series of measurements were completed for surface tension (maximum bubble pressure method), thermal conductivity (steady-state hot-wire method), viscosity (capillary tube method), and saturated vapor pressure (static method). The size and the concentration of nanoparticles in the lubricant were determined by dynamic light scattering (laser correlation spectroscopy). Obtained results (in particular case, decrease in surface tension of nanolubricants, increase the thermal conductivity and vapour pressure of refrigerant/lubricant mixtures) demonstrated a positive effect of nanoparticles to the refrigeration working fluids. Thus, the use of nanorefrigerants could enhance energy efficiency of refrigerating vapour compressor systems.

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Pages: 8 p.

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Details

  • Original title: Surface tension, viscosity, and thermal conductivity of nanolubricants and vapour pressure of refrigerant/nanolubricant mixtures.
  • Record ID : 30001625
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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