A HEAT EXCHANGER WITH COOLING ARCHITECTURE

An heat exchanger (20) and method for forming the heat exchanger (20), the heat exchanger (20) including a cooling architecture (122) comprising at least one unit cell (132, 132a) having a set of walls (138) with a thickness, the set of walls (138) defining fluidly separate conduits (124, 124c, 124h) having multiple openings (140, 140a, 140b), each of the multiple openings (140, 140a, 140b) having a hydraulic diameter; wherein an average fluid temperature (Tf) to material temperature limit (Tm) ratio TfTm is greater than 0 and less than or equal to 1.250