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Heat transfer nanofluids for trigeneration systems: fabrication and experimental investigation of viscosity at below-ambient temperatures.

Author(s) : SICA L. U. R., NOBRE G. C. M., CONTRERAS E. M. C., BANDARRA FILHO E., SOTOMAYOR P. O., PARISE J. A. R.

Type of article: IJR article

Summary

A new generation of energy-efficient buildings has emerged with the development of trigeneration technology (simultaneous production of heating, refrigeration and electric power). The operation of trigeneration systems requires working fluids (such as refrigerant for chillers), lubricants as well as heat transfer fluids (refrigeration secondary fluids and prime-mover coolants). Likewise, the dispersion of solid nanoparticles of promising materials such as graphene and MWCNT can potentially enhance the thermal conductivity of heat transfer fluids. However, pressure drop increases due to enhanced viscosity, which cannot be overlooked. In the present work, three graphene/MWCNT-heat transfer nanofluids were synthesized, and the temperature dependence of viscosity at below-ambient temperatures (10 to 20 C) was experimentally investigated. This effect was analyzed using the two-sample variation of the Kolmogorov-Smirnov test. The nanofluids highest KS-dissimilarities occurred from 19.5 to C and the empirical cumulative distribution functions had followed a linear profile. The KS-test was extended to analyze the effect of the nanoparticle type on nanofluids which have been synthesized with the same base fluid. However, no significant KS-dissimilarity was encountered. The relative viscosity followed a linear monotonic increase for all samples. Predictions provided by five classical models had underestimated the present data. Maron and Pierce’s equation presented the lowest error.

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Pages: 163-174

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Details

  • Original title: Heat transfer nanofluids for trigeneration systems: fabrication and experimental investigation of viscosity at below-ambient temperatures.
  • Record ID : 30028707
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 129
  • Publication date: 2021/09
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2021.04.036
  • Document available for consultation in the library of the IIR headquarters only.

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