Patent ID: 7797084

Claim:
An energy management system for managing consumed energy of a control target device including air conditioners in a building, said energy management system comprising: a pattern storage means, which stores a plurality of on and off patterns every predetermined unit of time; an analog pattern storage means, which stores a plurality of rates for every respective predetermined unit of time during rated operation; a program storage means, which stores programs for a year each predefined for each month or for each month and hour so as to reduce surplus load for every predetermined time; a digital control means, which reads out a program from the program storage means, reads out from the pattern storage means, an on and off pattern for the current month and hour specified by a preset program, and turns the control target device on and off for every predetermined unit of time; an analog control means, which reads out a program from the program storage means, reads out from the analog pattern storage means, a current month and hour operating ratio specified by the program, and controls an output rate for the control target device every predetermined time during rated operation, so as to reduce surplus load for every respective predetermined time, and a temperature monitoring means, which monitors a preset temperature, and stops control performed according to the program when a temperature that exceeds or falls below the preset temperature is detected.