抄録
Discussed here is electricity monitoring using wireless sensor nodes in 10 convenience stores. Through field experiments, we clarified the reason why energy-saving of convenience stores is difficult. Simply said the answer is “the effect of measures for saving power does' have a close connection with reduction of electric bill. Many equipment without display cooler and freezers and air-conditioning has stable and small power consumption in average temperature. If we can cut these power consumption, their values are small in comparison with total power consumption. Power consumption of display cooler and air-conditioning has large part of total power consumption, and fluctuate largely every day due to changing temperature and human behavior. This fluctuation masks the effect of individual measures. Therefore, we can’t obtain the evidence of the effect of measures from electric bill. How can we know adequate level of power consumption, in other word “reference” for power-saving? In order to make “reference” for achieving power profiling, it would be necessary to gather and analyze a large amount of power consumption data during a long period of time with several kinds of equipment.
