Heated header for subfreezing heat exchanger

A heat exchanger header comprising:

• a body with an outer surface and an inner surface, wherein the inner surface defines a plenum and a first outlet fluidically connected with the plenum;
• a first inlet extending through the body and fluidically connected with the plenum and configured to be fluidically connected to a cold air system on an aircraft;
• a heating fluid channel formed in the body between the outer surface and the inner surface and extending from a second inlet to a second outlet, wherein the heating fluid channel is fluidically isolated from the plenum and configured to be fluidically connected to a heating fluid source;
• an insulation layer covering the outer surface of the body;
• a first wall defining the inner surface of the body, wherein the first wall fluidically isolates the plenum and the heating fluid channel;
• a second wall attached to the first wall opposite the plenum, wherein the heating fluid channel is between the first wall and the second wall;
• and
• a third wall, wherein the third wall defines the outer surface of the body, and wherein the third wall attaches to the second wall opposite the first wall defining an insulating air gap between the second wall and the third wall and the insulating air gap comprises one or more fins;
• wherein the heating fluid channel comprises at least one partition that defines a path from the second inlet to the second outlet.

A heat exchanger comprising:

• a core comprising:
• a first layer comprising at least one passageway that extends in a first direction from an inlet to an outlet;
• and
• a second layer contiguous with the first layer comprising at least one passageway extending in a second direction;
• and
• a header comprising:
• a body with an outer surface and an inner surface, wherein the inner surface defines a plenum and a first outlet that fluidically connects the plenum and the inlet of the first layer of the core;
• a first inlet extending through the body and fluidically connected with the plenum and configured to be fluidically connected to a cold air system of an aircraft;
• a heating fluid channel formed in the body between the outer surface and the inner surface and extending from a second inlet to a second outlet, wherein the heating fluid channel is fluidically isolated from the plenum and is configured to be fluidically connect to a heating fluid source;
• and
• an insulation layer covering the outer surface of the body;
• wherein the header further comprises:
• a first wall defining the inner surface of the body, wherein the first wall fluidically isolates the plenum and the heating fluid channel;
• a second wall attached to the first wall opposite the plenum, wherein the heating fluid channel is between the first wall and the second wall;
• and
• a third wall, wherein the third wall defines the outer surface of the body, and wherein the third wall attaches to the second wall opposite the first wall defining an insulating air gap between the second wall and the third wall and the insulating air gap comprises one or more fins.