Method and apparatus for power load shedding

G - Physics – 05 – D

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323/1.15

G05D 23/20 (2006.01) F25D 29/00 (2006.01) G05D 23/19 (2006.01) G06G 7/63 (2006.01) H02J 3/14 (2006.01)

Patent

CA 1162981

ABSTRACT OF THE DISCLOSURE A method and apparatus for the control of power consumption in individual space-conditioning loads fed by an electric power network utilizes a commandable, programmable temperature control device which gradually, substantially continually changes the control setpoint in response to an external signal to reduce power consumption such that tem- perature changes go relatively unnoticed by the occupants. A radio receiver or the like is utilized to receive a signal from the power utility company and, in response to the sig- nal, the setpoint function of the thermostat associated with the load becomes an electronically simulated function in accordance with the invention and the user-control setpoint is removed from the control loop. The effective load shedding is also greatly enhanced by the provision of an integral reset function in addition to the conventional pro- portional control within the temperature control system. The use of a plurality of such systems enables the power utility to control electric power network peak load with a minimum impact on the comfort of individuals in the conditioned spaces. In the cooling mode, the temperature setpoint is caused to be slowly raised or ramped in a substantially con tinuous manner to a predetermined maximum temperature during the peak power consumption hours and, thereafter, is ramped back down to the fixed rate until the conditioned space is returned to its original temperature at which point control is returned to the user. Conversely, in the heating mode, the setpoint is ramped downward to a predetermined minimum temperature limit during peak power consumption hours and, thereafter, ramped back upward to its original setpoint at which time control is also returned to the user.

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