Sound-attenuating heat exchangers and methods of exchanging heat and attenuating sound within sound-attenuating heat exchangers

A method of exchanging heat and attenuating sound within a sound-attenuating heat exchanger, the method comprising:

• flowing a cooling fluid stream through a plurality of heat transfer-enhancing structures that extends from a first base side of a base region of the sound-attenuating heat exchanger;
• receiving, into a plurality of resonator cells of a sound-attenuating region of the sound-attenuating heat exchanger and via a plurality of resonator cell openings of the sound-attenuating heat exchanger, a sound wave that propagates within the cooling fluid stream, wherein the sound-attenuating region is positioned on a second base side of the base region, which is opposed to and faces away from the first base side of the base region, and further wherein each resonator cell opening of the plurality of resonator cell openings opens from a corresponding resonator cell of the plurality of resonator cells and toward the plurality of heat transfer-enhancing structures;
• attenuating the sound wave within the sound-attenuating region;
• receiving, with a plurality of elongate fluid conduits that is at least partially bounded by a planar region of the second base side that faces away from the first base side, a cooled fluid stream;
• exchanging thermal energy between the cooling fluid stream and the cooled fluid stream within the sound-attenuating heat exchanger;
• and
• maintaining fluid separation between the cooling fluid stream and the cooled fluid stream within the sound-attenuating heat exchanger.