Nanorefrigeration Oil Formed by C60, CNTs and Mineral Oil for Air Conditioner

Abstract:

To improve the energy efficiency of refrigeration systems, carbon nanopowders, such as fullerene (C60) and carbon nanotubes (CNTs), are used widely because of their remarkable lubrication and heat transfer capacities. In this work, the dispersion stabilities of mineral oil with added C60, CNTs, and compound C60/CNTs nanopowders were investigated, respectively, by means of sedimentation observation and UV–visible scanning spectrophotometry. The results show that the two methods correspond well. C60 is more stable than CNTs with increasing time; the absorbency of fullerene nanorefrigeration oil displays increasing order with increased concentration, whereby 2 g/L is the inflection point; but a similar pattern appears in CNTs–oil only when the concentration is below 0.5 g/L, after which the concentration of the suspension cannot be measured by the absorbency because their values are alike. The agglomeration of CNTs in mineral refrigeration oil can be restored and it may not create any problems when employed in operational refrigeration systems. The different preparation procedures of compound C60/CNTs–oil exert a large influence on dispersion stability; by grinding fullerene first, one obtains the best dispersion stability of the complex nanorefrigeration oil, in comparison with other methods.

• Periodical: Advanced Materials Research (Volume 629)
• Pages: 247-254
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.629.247
• Online since: December 2012
• Authors: Mei Bo Xing, Rui Xiang Wang
• Keywords: Cnts, Dispersion Stability, Fullerene C60, Mineral Refrigeration Oil

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