Patent ID: 6161764
Filing Date: 2000-12-19
Classification: F24F,Y02B

Abstract:
A controller for controlling mechanical cooling equipment and ventilating equipment for conditioning air within an enclosed space in response to signals indicative of air temperature and of at least one non-temperature air parameter respectively, the ventilating equipment being responsive to a ventilating equipment control signal to exchange a variable proportion of air within the space for air outside the space, the controller comprising:economizer control apparatus operable in response to a space thermostat signal indicating that a temperature in the enclosed space is above a setpoint temperature, and an enthalpy sensor signal indicating that air outside the enclosed space is suitable for providing cooling within the space, to produce mechanical cooling equipment control signals, said economizer control apparatus further being operable to produce an economizer control signal;air temperature apparatus connected to receive the economizer control signal and operable, at least partially dependent on the economizer control signal, to produce an air temperature control signal representative of a commanded temperature change of air entering the space;air quality apparatus operable to produce an air quality control signal representative of a commanded change in a non-temperature parameter of air within the space; anda signal processor connected to receive the air temperature and air quality control signals, and operable to produce a ventilating equipment control signal based on the one of the air temperature control signal, and air quality control signal which corresponds to the greater exchange of air within the space for air outside the space, the ventilating equipment control signal being suitable for causing ventilating equipment receiving the ventilating equipment control signal to increase the proportion of air within the enclosed space exchanged for air outside the space at least in part in response to the space thermostat and enthalpy sensor signals.