Rack-mountable heat-exchanger for modular electronic systems

A system, comprising:

• a first rack-mountable chassis, comprising:
• an ambient airflow path in a first direction;
• a recirculating airflow path in a second direction perpendicular to the first direction;
• a heat exchanger disposed in the ambient airflow path and the recirculating airflow path, configured to isolate the ambient airflow path from the recirculating airflow path;
• and
• a second rack-mountable chassis, comprising:
• an internal airflow path in a third direction, wherein the internal airflow path is linked to the recirculating airflow path, and wherein the third direction is in a different plane from the second direction.

A heatsink connected to an electronic device, comprising:

• an ambient air inlet;
• an ambient air outlet;
• a recirculating air inlet connected to the electronic device;
• a recirculating air outlet connected to the electronic device;
• and
• ducting, configured to isolate recirculating air carried via the recirculating air inlet, and the recirculating air outlet from air carried via the ambient air inlet and the ambient air outlet.