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The paper reviews one of the possible approaches to developing an analysis technique of Oxygen Generation System (OGS) thermal conditions. As an object of simulation a 30% KOH water electrolysis system with forced electrolyte circulation through the both electrolyzer chamber followed by separation of a gas/liqiud mixture using hydrophobic porous membranes. A formalized description of the key system components (an electrolyzer, set of coolers, separator, canister) is presented. A mathematical model simulating stationary and non-stationary thermal conditions of the system is constructed and its programming is reviewed. Some results of computational and operational experiments obtained for checking the model adecuacy are presented.

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.