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The Space Station requirements are divided into eleven systems. One of these systems, the Environmental Control/Life Support System (ECLSS) is further divided into seven functional categories as follows: Atmosphere Revitalization System, Atmosphere Pressure and Composition Control System, Module Temperature and Humidity Control System, Water Management System, Waste Management System, EVA Support and Safe Haven. The paper reviews the requirements for ECLSS in terms of the initial and growth operational capabilities of the Reference Space Station architecture. The paper reviews some of the results of a systems engineering study under way. Both regenerative and nonregenerative ECLSS techniques are reviewed. A design for all of the primary and backup technologies was established so that accurate trade studies could be performed. Each technology design started at a common interface condition for competing technologies.

The Space Station Environmental Control and Life Support System (ECLSS) consists of 51 functions. These functions are mostly independent of interactions. One exception is the regenerative air revitalization functions of carbon dioxide (CO2) removal, carbon dioxide (CO2) reduction and oxygen (O2) generation. Integration of these interdependent functions and humidity control into a single system provides significant opportunities for process simplification and reductions in power, weight and volume requirements compared to the use of discrete subsystems. An example of the magnitude of the opportunities provided is given by the ARS-1 developed by Life Systems under the sponsorship of National Aeronautics and Space Administration (NASA). Information presented in this paper quantifies the savings achieved by this integration and identifies other advantages available through process integration.