USC cools campus with 'water battery'

The University of the Sunshine Coast (USC) is using a thermal energy storage tank — coined ‘the water battery’ — to slash 40% of its grid energy use at its largest campus at Sippy Downs in Queensland.

Designed and built in partnership with Veolia, the system is claimed to be the first of its kind at an Australian university. The system consists of a three-storey tank of water that will be cooled by a complex thermal process powered by more than 6000 solar panels installed across the campus. The cooled water will be stored and used for air conditioning, which accounts for the greatest electricity use on campus.

The system is expected to save more than 92,000 tonnes of CO₂ emissions over 25 years, equivalent to the carbon emissions of 525 average Australian houses for the same period. It will lead to an estimated $100 million saving over the 25-year life of the project.

The 2.1 MW PV system, with panels spread across campus rooftops and carpark structures, will produce enough energy to cool 4.5 ML of water, effectively acting as a 7 MW battery.

USC Vice-Chancellor Professor Greg Hill said the system’s launch was a significant milestone in the university’s bid to become carbon neutral by 2025.

“Air conditioning accounts for 40% of our daily energy usage, so by eliminating this we are taking a major step towards our carbon neutral goal,” Professor Hill said.

“For a regional university to be leading the way on this is proof that we don’t need to be in the big cities to be taking big strides in new ideas in renewables, and for us that’s very exciting.

“This technology has the potential to change the way energy is stored at scale and we are hoping other organisations take inspiration and, indeed, copy us. The team behind this is already sharing the technology with schools, universities and companies around the world.

“At the same time, USC is using the technology to teach student engineers, designers and leaders of the future, while staff and students are able to track our energy savings through real-time monitoring across the campus.”

Danny Conlon, CEO and Managing Director for Veolia Australia and New Zealand, said, “We’ve enjoyed working with USC on such a unique and complex project. By working closely with the university, we’ve delivered a solution that makes them a leader in sustainable energy management in Australia. We’re delighted about the environmental and financial benefits this will bring them.”

Image courtesy of USC.