Abstract: A heat exchanger includes a heat exchanger shell formed from a first metal material, and a plurality of heat exchanger tubes extending through a plurality of tube openings in the heat exchanger shell. The plurality of heat exchanger tubes are formed from a second metal material different from the first metal material. A galvanic isolator is located at each tube opening of the plurality of tube openings, radially between the tube opening and the corresponding heat exchanger tube of the plurality of heat exchanger tubes. The galvanic isolator is configured to mitigate a galvanic reaction between the heat exchanger shell and the plurality of heat exchanger tubes.

Abstract: Disclosed is a method of in-situ application of a conformal surface treatment to an internal surface of a heat exchanger of a chiller comprising providing a surface treatment solution to an inlet of the heat exchanger of the chiller, urging a flow of the surface treatment solution along a flowpath from the inlet past a plurality of heat transfer tubes to an outlet of the heat exchanger of the chiller, collecting the surface treatment solution, forming the conformal surface treatment along an internal surface of the first manifold, the plurality of heat transfer tubes, the second manifold, and a plurality of interconnections therebetween, stopping the flow of the surface treatment solution, and removing the surface treatment solution from the chiller.