Rolls-royce Corporation

Vivek Muthu

Chandana Jayamapathi Gajanayake

Pradip Chatterjee

Amit Kumar Gupta

A two-start helical heat exchanger comprises a helical baffle extending along a length of the heat exchanger and having first and second surfaces, wherein: the first surface of the baffle is arranged to provide a first helical fluid flow path for a first fluid; and the second surface of the baffle is arranged to provide a second helical fluid flow path for a second fluid, wherein the second fluid flow path is arranged in counter-flow with the first fluid flow path and a casing within which the baffle is mounted. The baffle is arranged such that first and second fluid flow paths are in thermal contact with each other through the baffle, and in thermal contact with the casing. The heat exchanger may be incorporated into a power converter, for example to cool the power converter. The heat exchanger may be used on an aircraft.

Heat exchanger

A thermal management device for dissipating heat from one or more electrical components in an aircraft, the thermal management device including: a heat spreader with a plurality of layers of annealed pyrolytic graphite, the heat spreader having higher thermal conductivity in a plane defined by the layers than in a direction perpendicular to the layers; a flow path for a cooling fluid defined through the heat spreader, such that at least a portion of the flow path is surrounded by the heat spreader, wherein the flow path is helical, around a central axis extending through the plurality of layers; and a housing encasing the heat spreader, the housing arranged to have one or more electrical components mounted there-on and to form a thermal interface between the heat spreader and one or more electrical components.

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Singapore, Singapore

Vivek Muthu