Electronic cooling system having a ventilating duct

A heat dissipation device comprising:

• a first heat sink having a plurality of fins;
• a first fan attached to a side of the first heat sink;
• a second heat sink having a plurality of fins;
• a second fan attached to a side of the second heat sink;
• and
• a fan duct interconnecting the first fan and the second heat sink, comprising an inlet portion facing the first fan and an outlet portion facing the second heat sink.

A computer system comprising:

• an enclosure defining a plurality of louvers;
• a printed circuit board received in the enclosure;
• a heat-generating electronic component mounted on the printed circuit board;
• a heat pipe having an evaporating portion thermally connecting with the electronic component and first and second condensing portions;
• a first heat sink thermally connecting with the first condensing portion;
• a second heat sink thermally connecting with the second condensing portion;
• a fan duct interconnecting the first and second heat sinks;
• and
• a fan assembly generating an airflow first flowing through the first heat sink, then the fan duct, the second heat sink and finally the louvers of the computer enclosure to leave the computer system.