Researchers at the University of South Australia (UniSA) have developed a revolutionary refrigeration system that could significantly reduce energy consumption and greenhouse gas emissions in supermarkets, hospitals, and other large-scale cooling applications.
The innovative indirect evaporative (dew point) carbon dioxide (DP-CO₂) refrigeration system, co-developed by UniSA and Glaciem Cooling Technologies, has been installed and tested at a new Coles supermarket in Norwood, South Australia.
Preliminary results from the RACE for 2030 CRC research program are promising, showing a 19 per cent reduction in annual refrigeration energy consumption and a 37 per cent decrease in peak electricity demand.
These significant improvements could lead to substantial reductions in greenhouse gas emissions and operational costs for businesses.
Dr Tim Lau, chief investigator and sustainable energy researcher at UniSA, explained the system’s efficiency: “The system uses dew point coolers to pre-cool the ambient air, allowing the overall system to operate efficiently, even in hot climates exceeding 40 degrees Celsius, reducing energy usage by more than a third, compared to conventional systems during summer months.”
The potential impact of this technology is substantial, considering that heating, ventilation, air conditioning, and refrigeration can account for up to 70 per cent of customers’ electricity usage and 24 per cent of Australia’s total electricity consumption.
The researchers have developed a computational model to assess the system’s potential across various sectors, including hospitals, meat processing plants, cold storage facilities, and aquariums. The greatest benefits are expected in hot, dry climates like central Australia.
This groundbreaking project builds upon previous research conducted by UniSA, which earned researchers the 2015 ANSTO Eureka Award for Innovative Use of Technology.
The earlier work focused on developing a new phase change material (PCM) aimed at reducing storage size and cost while improving methods for charging and discharging conventional refrigeration systems.
As the world seeks more sustainable solutions to combat climate change, innovations like this energy-efficient refrigeration system could play a crucial role in reducing the carbon footprint of various industries.
Dr Lau concluded: “This project paves the way for greener and more cost-effective commercial refrigeration, not only in Australia but across the world”.