Duquesne University is a landlocked but growing university in the heart of Pittsburgh. The Power Center, a new LEED project, was added to the central cooling plant upon completion. Additionally, the AJ Palumbo Center HVAC cooling systems were going to be replaced in the near future so additional cooling capacity was needed. Room for an additional cooling tower was hard to come by so it was decided to use the existing cooling tower capacity that was available at night. So an ice making chiller and 6000 tn hours of energy storage were installed to the existing cooling plant.

The University is now very cooling diverse as it is able to cool with nighttime and or daytime grid energy using electric chillers, or cool using absorption chillers fired with waste heat or natural gas, or cool with energy storage made and stored off peak. Additionally, the university has a combined heat and power generation system that, when combined with energy storage and absorption cooling opens up many demand response opportunities. The load shed results have been favorable under the Duquesne ACT 129 Demand Response Events that were issued through June 2012. This was done by reducing the electric chiller(s) operation under peak load management parameters.

Ice Thermal Storage