Bearing compartment sealing system with passive cooling

A sealing system for a bearing compartment of a gas turbine engine, the sealing system comprising:

• a runner configured to extend circumferentially around a rotating component, wherein the runner is formed of a material with low radial thermal growth, wherein the runner is configured to fit to the rotating component to remove heat away from the runner and wherein the runner includes an outer surface configured to provide passive cooling for the runner in the bearing compartment;
• a static structure located radially outboard of the runner defining a sealing compartment, the static structure including:
• a retainer assembly;
• a first carbon seal element disposed in the retainer assembly on an oil side of the sealing compartment and radially outboard of the seal runner, the first carbon seal element configured for contact with the seal runner to prevent oil leakage from the bearing compartment;
• a second carbon seal element disposed in the retainer assembly on an air side of the sealing compartment and radially outboard of the seal runner, the second carbon seal element configured for non-contact with the seal runner along an entire axial extent of the second carbon seal element;
• and
• one or more openings in the retainer assembly to admit a flow of buffer air to pressurize the sealing compartment, the one or more openings configured to admit the flow of buffer air into the sealing compartment at a location radially outboard of a radial extent of the first carbon seal element and the second carbon seal element;
• wherein the runner is configured to operate without direct oil cooling.