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Two large reclaimed water pump stations owned and operated by the City of Santa Rosa, California, were retrofit for improved energy efficiency. A detailed energy audit developed mathematical pumping energy models to provide a scenario evaluation platform for the retrofit design, and
predict the performance of the retrofits. Three new pumps were purchased through a competitive bid process that took into account life cycle energy costs, and incentivized the pump vendors to balance pump performance and up-front cost. Both retrofits were measured for energy performance, and
yielded an 875 MWHr annual reduction in electricity demand, saving an estimated 96,000 per year. The post retrofit energy performance was measured and compared to the estimates from the mathematical models. Minor variances in energy performance between model predictions and measured performance
were attributed to real-world features that were not incorporated into the pumping energy models. California public programs targeting energy efficiency were vital, providing financial support for up-front engineering, a substantial cash incentive, and a loan for the capital cost.
Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.