Support AB32 GHG Reductions and Save Cost As Well?. Wayne Spittal AWWA CA/NV Section Spring 2008, Hollywood CA. The Issue. Global warming has now been firmly bought to the attention of the general public Internationally
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AWWA CA/NV Section
Electric Power Research Institute, Energy Audit Manual for Water/Wastewater Facilities, (Palo Alto: 1999), Executive Summary
Ref: CEC Martha Krebs PhD, Feb 2007
Source: “California Climate Policy Landscape,” Shankar B. Prasad, Deputy Secretary for Science & Environmental Justice, California Environmental Protection Agency, September 2006.
Up to 95% of energy consumption is used for pumping
Electric motors driving pumps are not necessarily efficient
Purchasing decision lead by lowest up from cost, not efficiency
Pump scheduling systems so-far have focused mainly on time-of-use kWh and peak kW charge avoidance
However, targeting efficiency for each pump and pump station can also lead to considerable kWh reductions
Each kWh saved also leads indirectly to CO2 and other greenhouse gas (GHG) reductions
Reducing the kWh/MG/ft should therefore be a goal for every water utility in respect of emissions management
Unfortunately static testing of pumps and individual pump upgrades is not enough on its own
The dynamics of a moving system curve means real-time pump selection is required
Current day / real-time
Solver / EPAnet
PC on LAN
Water Utility SCADA System
Of the 5 techniques employed, energy efficiency improvements produced the most unexpected outcome
The optimizer software used searches for the lowest cost schedules that deliver the required mass balance of water within specified system constraints
Part of the half-hourly adaption routine is to dynamically calculate energy use and cost for each feasible schedule
Part of this calculation is to hydraulic model and compare the feasible schedules. This means overall pump wire-to-water efficiency becomes an important factor.
Selected field results ..
Installed in some of the largest US cities, some operating since 2004
Greenhouse gas reductions through efficiency improvements