There is a need for an automotive engine cooling system capable of handling increased heat load while, at the same time, having reduced size and weight. This paper evaluates a concept for an engine cooling system with a passive heat accumulator that averages out peak heat loads. Heat load averaging permits relaxation of the cooling system requirements and allows substantial reduction of system size and weight. This also translates to a smaller coolant inventory allowing for faster engine warm-up and reduced emissions of harmful pollutants during a cold engine start.
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