Hamilton Sundstrand Corporation

Gregory M Ott

George Eugene Wilmot, Jr

Diane G Drew

A thermal management system comprises a first heat exchanger having an inlet and an outlet, a second heat exchanger having an inlet and an outlet, a fluid loop, a first heat pump, and a second heat pump. The fluid loop circulates a fluid, and forms a continuous path between the first and second heat exchangers. The first heat pump is connected to the fluid loop and is disposed between the outlet of the second heat exchanger and the inlet of the first heat exchanger. The second heat pump is connected to the fluid loop and is disposed between the outlet of the first heat exchanger and the inlet of the second heat exchanger.

Thermal management system with staged cooling

A thermal management system avoids problems associated with the recirculation of fuel through a fuel tank on an aircraft in a system that includes a fuel reservoir ( ), a pump ( ) for pumping fuel from the reservoir ( ) to a first heat load ( ) and then to a check valve ( ) to a junction ( ). At least one second heat load ( ), ( ), ( ) is connected to the junction ( ) and a fuel/fan air heat exchanger ( ) having a fan air flow path in heat exchange relation with a fuel flow path having a fuel discharge end ( ) connected to the junction ( ). The fan air flow path is adapted to be connected to receive compressed air from the fan ( ) of an engine ( ). A bleed air/fuel heat exchanger ( ) receives fuel from the second heat load and bleed air from the engine ( ) and is connected to deliver fuel to the engine ( ). A control valve ( ) is interposed between the second heat load and the engine ( ) for proportioning the flow of fuel to the engine ( ) and the fuel fan heat exchanger ( ) so that excess fuel is recirculated without reintroduction into the fuel reservoir ( ).

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Feeding Hills, MA, United States of America

Gregory M Ott