sCO2 Technical Glossary & Terminology
A comprehensive reference for engineers and procurement leads navigating the technical landscape of supercritical CO2 technology.
Supercritical CO2 (sCO2)
Carbon dioxide held at or above its critical temperature (31.1°C) and pressure (7.39 MPa), exhibiting properties of both a gas and a liquid.
View Technical Context →GH4169 Alloy
A Chinese high-temperature nickel-based superalloy equivalent to Inconel 718. It is essential for sCO2 turbine blades due to its fatigue resistance at 650°C+.
View Technical Context →Transcritical Cycle
A thermodynamic cycle where the working fluid (CO2) is at supercritical state in the high-pressure side and subcritical in the low-pressure side.
View Technical Context →COP (Coefficient of Performance)
The ratio of heating or cooling provided to electrical energy consumed. Verified sCO2 units maintain a COP > 2.0 at -30°C.
View Technical Context →R744 Refrigerant
The industrial designation for CO2 used as a natural refrigerant. It has a GWP (Global Warming Potential) of 1 and ODP of 0.
View Technical Context →MW-Scale sCO2
Refers to large-scale energy recovery systems with power outputs starting from 1 Megawatt, typically using GH4169 Superalloy turbines.
View Technical Context →Missing a Term?
Our technical board updates this glossary monthly. If you have a specific metallurgical or thermodynamic query, consult our AI Analyst.
Ask Technical Hub