Patent Document ID: 20020035927
Application ID: 09948410
Patent Flag: 0

Claim One:
1. An apparatus for providing an enclosed environment for enclosing a space wherein the enclose environment is different from an outside ambient environment, comprising: one or more oxygen concentrators or nitrogen generators for changing a concentration of oxygen in said enclosed environment; a CO 2 scrubber for reducing a concentration of CO 2 in said enclosed environment; an oxygen sensor for sensing a concentration of oxygen in said enclosed environment; an CO 2 sensor for sensing a concentration of CO 2 in said enclosed environment; a controller for: (i) receiving oxygen concentration input from said oxygen sensor, and for receiving CO 2 concentration input from said CO 2 sensor, (ii) outputting activation signals to at least one of: said oxygen concentrators and said CO 2 scrubber when at least one of said oxygen concentration input and said CO 2 concentration input is outside of a predetermined range; a predictor for predicting at least one of a concentration of oxygen and a concentration of CO 2 in said enclosed environment, wherein said predictor uses one or more of: (1) a volume of said enclosed environment; (2) a number of persons or animals expected to occupy said enclosed environment; (3) an oxygen removal or supply rate of said oxygen concentrators; (4) a nitrogen addition or supply rate of said nitrogen generators (5) a number of said oxygen concentrators; (6) a number of said nitrogen generators (7) a per-person oxygen consumption rate; (8) a per-person carbon dioxide production rate; (9) an initial oxygen concentration in said enclosed environment; (10) a concentration of CO 2 said enclosed environment; (11) a CO 2 concentration in the outside ambient environment; (12) a airflow rate through said CO 2 scrubber; (13) an efficiency of said CO 2 scrubber at removing CO 2 from air in said enclosed environment; and (14) an air exchange rate in said enclosed environment expected to be provided by a fan.