The performance characteristics of two specific three fluid, cross flow, heat exchanger configurations have been determined; and then evaluated comparatively with other conceivable arrangements previously analyzed. Results have been presented in terms of the temperature effectiveness of two of the fluid streams as a function of heat exchanger size for sets of fixed operating conditions. These results are presented over a wide range of operating parameters for a single pass configuration, but only for selected two pass conditions. Where possible, general conclusions as to the advantages and disadvantages of the configurations analyzed in this effort compared to those previously evaluated are presented. This comparative evaluation was conducted over the entire range of operating parameters analyzed for the single pass, three fluid, cross flow heat exchanger.