Patent ID: 6578770
Filing Date: 2003-06-17
Classification: F24F,G01N,G05D,Y02A,Y02B

Abstract:
A system for monitoring and modifying the quality and temperature of air within a conditioned space and including a blower unit, a temperature moderating unit and a control unit, said control unit comprising:A) a thermostat including temperature set point establishment means and temperature control means for selectively activating said temperature moderating unit when the temperature of the conditioned space deviates by a predetermined amount from the established temperature set point; and B) CO2 concentration measuring and control apparatus for the conditioned space, said CO2 concentration measuring and control apparatus comprising: 1) a CO2 sensor comprising: a) a reference electrode source of oxygen anions; b) a lower electrical reference electrode coupled to said reference electrode source of anions; c) a solid electrolyte coupled to said lower reference electrode; d) a buffer layer; and e) an upper electrode coupled to said buffer layer; 2) CO2 concentration measuring apparatus in which: a) an electrical voltage is applied between said lower electrical reference electrode and said upper electrical electrode, said electrical voltage having a cyclic waveform and instantaneous values between a predetermined negative voltage and a predetermined positive voltage; and b) the current through said electrolyte measured, at a predetermined voltage intermediate said predetermined negative voltage and said predetermined positive voltage, is representative of the CO2 concentration; and 3) CO2 concentration modifying apparatus responsive to the measurement of at least a first predetermined CO2 concentration for turning on said blower unit.