Stanford’s New Energy Plant Helps Cut Water use by 15%

June 17, 2015 By Linda Hardesty

Johnson Controls energy manageA new central energy facility at Stanford University is helping the school cut its water use by 15 percent.

Stanford’s new energy plant operates efficiently in any weather condition, thanks to heat recovery chillers, hot and cold water thermal energy storage, and a patented smart technology system that uses weather and electricity pricing forecasts to optimize operations. The central plant system is a key component of the Stanford Energy System Innovations (SESI).

Johnson Controls worked with Affiliated Engineers to deliver a custom-engineered heat-recovery process that is 70 percent more efficient than the cogeneration process Stanford used since 1987. York heat-recovery chillers will meet more than 90 percent of campus heating demands by capturing almost two-thirds of the waste heat generated by the campus cooling system to produce hot water for the heating system.

Along with a Metasys building automation system, Johnson Controls developed the Enterprise Optimization System, a predictive control software system to optimize cost and energy use based on the 10-day weather forecast and future grid electricity prices. The software is designed to predict hourly campus heating and cooling needs, and then determine how to best run the heat recovery, heating, and cooling equipment inside. It also will determine how much hot and cold water to store in the central energy facility’s water thermal storage tanks for later use.

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