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This paper deals with the Functions Effectiveness Model (FEM) for Design of the Integrated Regenerative Life Support Systems (IRLSS) based on the physico-chemical methods of the crew metabolic–waste products transformation to controlled components of human environment and intended for the initial problem solution of the IRLSS technology synthesis. The Functions Effectiveness Model of the IRLSS is utterly based on the conceptual model of the Manned Orbital Station Ecologic–Technical System (1), which includes the IRLSS and links of environment: the Space Station Design, the Spaceship crew (CREW), the Space Cabin Atmosphere (SCA), the Thermal Control System (ThCS), the Energetic-Support System (ESS) and the Auxiliary Systems (AS).

This paper deals with a functions analysis methodology of the Space Orbital Stations' and Interplanetary Vechicles' Ecological/Technical System (ETS) intended for research into various stages of the system life cycle based on methods of simulation. The man-made ecosystem of any spacecraft is distinguished from the natural ecosystem as follows: (a) Man is the decisive part of the system defining the main requirements to its properties, functions and developing laws; (b) the processes of controlled substance turnover are accomplished in the limited number of technical units at rates substantially exceeding those of slow natural processes. That is why the similar system shall be defined as the ecological/technical system. The ETS conceptual model is substantiated.