Fuel and oil heat management system for a gas turbine engine

A system for transferring heat energy among a heat generating gas turbine engine, a heat generating accessory drive coupled to the gas turbine engine, a stream of fuel flowing at a metered flow rate, and a stream of cooling air, comprising:

• a first oil circulation loop wherein a first flow of oil circulates through the accessory drive, a first air-oil cooler having a first, regulated portion of the cooling air stream also passing therethrough, and a first fuel-oil heat exchanger;
• a second oil circulation loop wherein a second flow of oil circulates through the gas turbine engine, a second air-oil cooler having a second, regulated portion of the cooling air stream also passing therethrough, and a second fuel-oil heat exchanger;
• means for conducting at least a portion of the metered fuel stream, in sequence, through the first fuel-oil heat exchanger, the second fuel-oil heat exchanger, and a main fuel pump, the main fuel pump operating at a fuel delivery rate in excess of the metered fuel flow rate;
• a fuel controller for receiving the fuel flowing from the main fuel pump and dividing the received fuel between a supply stream having a flow rate equal to the metered flow rate, and a bypass stream having a flow rate equal to the excess of the main pump delivery rate over the metered flow rate;
• and
• means, in fluid communication with the fuel controller and the conducting means, for returning the bypass fuel stream into the fuel conducting means upstream of the main fuel pump at a plurality of distinct locations.