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The Space Exploration Initiative, (SEI), has renewed interest in examining various technologies for generating electrical power in space as well as on the surface's of the Moon and Mars. One technology that is of interest is the Closed Brayton Cycle, (CBC). Recent work has further enhanced the capability to perform accurate preliminary design and optimization of CBC power conversion systems for space applications. The basic building block of the computer codes used for this work has been the Closed Cycle Engine Performance, (CCEP), code developed by John Klann at NASA Lewis Research Center. This model was originally developed for the preliminary design and performance analysis of the Space Station Freedom dynamic power conversion system. Improvements to the model have included linking CCEP with the public domain optimization code COPES/ADS. This linkage has greatly enhanced the utility of the program and streamlined the design process.