Supercritical CO2 Turbine


Infinity Turbine is now working on a S-CO2 Brayton Cycle Turbine that uses waste heat to make electricity.

The advantages of a R744 (CO2) based working fluid system are smaller size and increased efficiency.

The challenges of designing a Supercritical CO2 Brayton Cycle:

  1. 1. Sealing:  The high pressures of supercritical CO2 necessitate a strong assembly and secure sealing with CO2 grade O-rings and gaskets. 

  1. 2. CO2 Turbine:  The turbine rotor has to be able to withstand both liquid and gas.  CO2 in the supercritical state is a very dense gas.

  1. 3. Feedpump: The feedpump needs to withstand a 300-750 psi inlet and 2,000 psi exit pressure.  This is done best with a positive displacement pump.  Small pumps are very difficult to find.  Many pump manufacturers claim to have them, but they do not (or they will not function with the higher exit pressure).

  1. 4. Assembly: The pump and turbine housing needs to be very strong, and easily adaptable to change (especially during development). The more modular the assembly, the more likely the development can go to commercial project in fewer steps. Using a interchangeable modular block system allows easy maintenance and upgrades to components.

  1. 5.Drive: A magnetic coupling and reduction gear are    essential to utilizing the high speed rotational output of the system. This allows the power output to drive a conventional speed AC or DC generator.

  1. 6.Size:  The high efficiency of the Supercritical CO2 cycle allows the system to be a fraction of the size of conventional ORC equipment.  It also allows 2-5 times increase in power output in the same footprint.

We'll start with a proof-of-concept with our ITmini platform, then move up to a IT10 platform, then finally with a IT250 kW platform. 

Because our turbines are modular, we can scale up to any size.  The ultimate design goal would be around 3 MW.

Greg Giese

Infinity Turbine LLC



Infinity Turbine

R744 Supercritical CO2 Turbine

Advantages of S-CO2 Brayton Cycle - Using a Infinity CO2 Turbine with new Innovations:

  1. Temperature Range 100-500 C

  2. Efficiency 40-50 %

  3. Working Fluid - Refrigerant is CO2 ( R744 ) S-CO2

  4. No Extermal Feedpump

  5. No Mechanical Gearbox

  6. Indirect Drive Mag Gear

  7. Standard Generator

  8. One Modular Helix Heat Exchanger which performs both tasks as evaporator and condenser

  9. Supercritical S-CO2 Cycle is much more efficient that standard ORC cycle

  10. Load System with Dry Ice as Working Fluid

  11. To Reload Working Fluid Fluid, Add Dry Ice

  12. No Pipes - System Uses Proprietary Modular Block System

  13. Working Fluid Metered by Solid State Device

  14. Magnetic Coupling is Hermetically Sealed

  15. Reduced Build Time and Cost

  16. Compact Design

  17. One Moving Part within Sealed Turbine and Helix Heat Exchangers

  18. Magnetic Gear Drive can Power 1,800-3,600 RPM Standard Rotary Devices Including Pumps and Generators

  19. Uses Modular Block Concept

  20. Nano Fluid Additive for Increased Heat Transfer

  21. Cavitation Vaporization Pre Heat


This system is designed for waste heat.  While ORC (Organic Rankine Cycle) is designed for lower grade heat, this system is for waste heat above 140 C.

To run the system, you need to provide a heated liquid flow (hot water, steam, hot oil, etc.) and cool liquid flow (cool water).

Copyright 2013 Infinity Turbine LLC