The Korea Institute of Machinery and Materials (KIMM) has successfully tested a large-capacity ultra-low temperature (ULT) Turbo-Brayton cooling system using a refrigerant with zero Global Warming Potential (GWP). This milestone marks the first time such technology has been demonstrated in Korea.
Led by Principal Researcher Junseok Ko, the KIMM team developed and tested the Turbo-Brayton cooling system, which achieved a cooling capacity of over 10 kW at -100 ℃. The technology showcases significant potential, particularly in industries requiring large-capacity cooling solutions, such as the semiconductor sector.
The Turbo-Brayton cooling technology employs a turbo machine rotating at ultra-high speeds, ranging between tens to hundreds of thousands of RPM. Initially used for specialized applications like superconducting cable cooling and LNG re-liquefaction, this technology is now gaining traction in the semiconductor and bio industries, where ultra-low temperature solutions are increasingly necessary.
One of the key advantages of the new system is its zero GWP refrigerant, addressing concerns about carbon neutrality and stringent refrigerant regulations. Traditional vapor-compression ULT chillers, which use high GWP refrigerants or potentially explosive natural alternatives, face limitations in scaling capacity and temperature control. The Turbo-Brayton system, however, offers a wide range of controllability, from 5.5 to 11 kW, enhancing operational flexibility.
The KIMM team has developed the core components, including a centrifugal compressor and turbo expander, entirely in-house. This achievement represents a significant leap in the domestic development of advanced cooling technologies.
"Through the cooling performance test, we have confirmed that the Turbo-Brayton cooling system can be used for large-capacity cooling of 10kW or larger at the ULT of -100 ℃," said Principal Researcher Junseok Ko. "Within three years, we aim to refine this technology for broader industrial applications, particularly in the semiconductor industry."
This research was supported by KIMM’s project for developing core machinery for ultra-low temperature cooling systems used in semiconductor manufacturing.
