Performance of organic oils in solar thermal collection is limited due to their low thermal conductivity when they are compared to\nmolten salt solutions. Extraction of organic oils from plants can be locally achieved. The purpose of this study was to investigate\nthe effect of use of copper nanoparticles in some base local heat transfer fluids (HTFs). Addition of volume fraction of 1.2% of the\ncopper nanoparticles to oil-based heat transfer fluids improved their thermal conductivity as deduced from the thermal heat they\nconducted from solar radiation. The oil-based copper nanofluids were obtained by preparation of a colloidal solution of the\nnanoparticles.
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