A computer system has a chassis, a plurality of interconnected panels mounted on the chassis in a manner defining an interior space at least partially encompassed by the panels, a circuit assembly, an electrically-powered fan within the interior space, and an energy conversion device mounted within the interior space. One or more of the panels has an airflow opening therein. The circuit assembly is mounted on the chassis within the interior space and includes a heat generating system component. The heat generating system component includes a surface from which energy in the infrared (IR) electromagnetic spectrum is emitted during operation thereof. The energy conversion device is configured for converting the emitted infrared energy to electrical energy and is electrically connected to the electrically-powered fan for providing the electrical energy thereto.