Flownex users can model all the components in a sCO2 cycle in various degrees of complexity. This ranges from using performance charts as well as more detail for the systems that needs to be investigated in more detail. Flownex has the capability to do the analysis for a steady-state study as well as a dynamic analysis if transient effects and control responses need to be investigated.

The two-phase CO2 fluid packaged and shipped with Flownex allows modelling in the supercritical ranges. Even though the actual cycle requires the fluid to remain a gas during operation, this functionality allows designers to verify operating philosophies aimed in keeping fluid within the single phase region.

CO2-Brayton-cycleFlownex can be used as the tool of choice for researching, improving and optimising sCO2 Brayton cycles because it can simulate outputs required in:

  • Flow losses
  • Heat transfer
  • Critical mass flow (choking)
  • Complete cycle efficiency
  • Operating ranges
  • Start-up and shutdown analysis
  • Control system design
  • Operator training
  • Component sizing

The capability of Flownex to model the Brayton cycle was proven during extensive work done in the Nuclear industry when helium was used as the operating fluid for the High-Temperature Reactors.

Furthermore, Gas Technology Institute (GTI) utilizes Flownex to simulate and optimize the transient operation of their $119M, 10 MWe, sCO2 pilot plant’s main process loop. Allowing them to better understand the transient operational ranges of their components and evaluate control philosophies.

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