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Most conventional fluids, such as water, ethylene glycol and engine oil, have limited thermal capabilities properties, which may impose restrictions in many thermal applications. On the other hand, correctly there is an extensive research that has proven that nanofluids (suspensions of nanometer-sized metallic particles in a base fluid) are better heat transfer agent than conventional fluids, e.g. [1]. An important application of nanofluids can be used in refrigeration systems such as automobile radiators with an important impact in the reduction of the sizes of radiators.