The Brayton cycle the basic thermal power cycle implemented in gas turbines. ASCEND provides support for modelling Brayton cycles with a range of models of increasing complexity.
The models are provided in the file models/johnpye/fprops/brayton_fprops.a4c. These models make use of the FPROPS fluid properties library to obtain high-accuracy thermodynamic property evaluation. Some earlier models using ideal air as the working fluid are available in the model file models/johnpye/brayton.a4c.
See also Combined-cycle gas turbine
Split Brayton Cycle
This cycle has been identified as highly efficient when the working gas is supercritical carbon dioxide (sCO2), and is under active development for potential use in next-generation solar thermal and nuclear power plants. The configuration is shown below.
The model brayton_split_co2, contained in the file models/johnpye/fprops/brayton_split.a4c, implements this cycle. The T-s diagram of the cycle in our default configuration is shown below:
Regenerative Brayton cycle
This cycle is implemented in the model brayton_regen, contained in the file models/johnpye/fprops/brayton_fprops.a4c. The T-s diagram of the cycle in our default configuration is shown below:
Regenerative Brayton cycle with reheat and intercooling
This cycle is an improvement on the simple regenerative Brayton cycle as it allows the compression and expansion to take place at closer to a uniform temperature, increasing the area inside T-s cycle loop. The model is shown here is brayton_regen_reheat_intercool_co2 from models/johnpye/fprops/brayton_fprops.a4c.