tailieunhanh - Energy Management Systems 2012 Part 4

Tham khảo tài liệu 'energy management systems 2012 part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 48 Energy Management Systems Fig. 9. Distribution of electrical and gas meters 49 Methodology Development for a Comprehensive and Cost-Effective Energy Management in Industrial Plants Fig. 10. CuSum of the hydraulic press energy consumption Due to the modality of CuSum construction a meaningful change in the slope of the curve highlights the presence of energy consumption anomalies. A warning or an alarm for the operator could be set when the CuSum reaches an upper or a lower limit. As proposed in Cesarotti et al. 2010 the first warning limit values are the 3o of initial population the second alarm limit values are set evaluating the particular sensitiveness of the monitored users. Using these limit values an alert has been given in October 2008 to point out that energy was being wasted the emerged problems were essentially linked to bad maintenance procedures and an excessive heating of hydraulic oil. The improvement in these two topics bring a great change in the press performance as it s reported in Figure 11 in Table 8 an estimate of the reached saving is also described. Fig. 11. CuSum of the hydraulic press energy consumption after .