Pool boiling heat transfer performance of nanofluid has been studied during the past few years. Some controversial results are reported in literature about the potential impact of nanofluids on heat transfer intensification. So the present study is motivated by these conflicting results. Whereas the mixtures of ethylene glycol and water are considered the most common water-based antifreeze solutions used in electronics cooling and automotive cooling systems, the present study is an experimental investigation of boiling heat transfer of CuO/ethylene glycol- water (60/40) nanofluids with low concentrations of nanoparticles. The results indicate that a considerable boiling heat transfer enhancement has been achieved by nanofluid compared to base fluid and the enhancement increases with increasing nanoparticles concentration and reaches 55% at a nanoparticles loading of 0.5% by weight. The results of the present study suggest application of low concentrated nanofluids made up of these mixtures as the based fluids in such cooling systems.

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