Sectioned gas turbine engine driven by sCO2 cycle

A method of operating a sectioned heat exchanger system of a gas turbine engine, comprising:

• receiving a working fluid with an inlet manifold;
• distributing the working fluid to a plurality of circuits including at least first and second circuits configured to transfer heat with respect to the working fluid, each of the first and second circuits having a circuit heat exchange channel;
• passing the working fluid through an outlet manifold and to an outlet;
• measuring a first parameter of the first circuit with a first sensor;
• measuring a second parameter of at least one of the outlet and the second circuit with a second sensor;
• selectively isolating at least one of the plurality of circuits with a controller of the gas turbine engine and by closing at least one of the first and second circuits in response to detecting a leak based on a parameter difference between the first and second parameters.

A system of a gas turbine engine, comprising:

• a compressor;
• a turbine;
• a sectioned heat exchanger fluidly interposing the compressor and turbine, the sectioned heat exchanger including:
• an inlet manifold configured to receive a working fluid;
• a plurality of circuits including at least first and second circuits configured to transfer heat with respect to the working fluid, each of the first and second circuits having a circuit inlet valve, a circuit heat exchange channel, and a circuit outlet valve;
• an outlet manifold configured to pass the working fluid to an outlet;
• a first sensor configured to measure a first parameter of the first circuit;
• a second sensor configured to measure a second parameter of at least one of the outlet and the second circuit;
• and
• a controller of the gas turbine engine and configured to selectively isolate at least one of the plurality of circuits by closing at least one of the first and second circuits in response to detecting a leak based on a parameter difference between the first and second parameters.