Hesam Semsarilar

Hesam Semsarilar

University of South Australia

Use of CO2 as a volatile heat-transfer fluid in thermal energy storage


Thermal Energy Storage (TES) has been used by mankind for millennia and has been a key industrial process for more than a century. More recently, ice-on-coil TES systems have become an integral part of commercial air conditioning as a means of a highly cost‐effective and environmentally sustainable energy storage. 

A recent collaborative study by the University of South Australia and Glaciem Cooling Technologies has identified improvements in both the capacity and heat-transfer rate of low-temperature TES systems when the primary refrigerant is interfaced directly with the phase change material. Use of CO2 as both the primary refrigerant and the volatile heat-transfer medium in ice‐on‐coil TES systems will greatly improve system heat-transfer characteristics by eliminating sensible heat-transfer losses. Further improvement in the efficiency of the cooling system is achieved through higher saturated suction temperatures requirement. Finally, higher heat-transfer rate can be achieved with lower input power due to thermophysical and hydraulic properties of CO2 compared to typical secondary refrigerants. 

About Semsarilar
Semsarilar is a design engineer whose background is in the field of industrial automation and robotics. His recent role as a senior research engineer at the University of South Australia has involved working closely with Glaciem Cooling Technologies in the field of industrial refrigeration, developing customised CO2 solutions that are often integrated with thermal storage for maximum utilisation of renewable energies.