The discussion revolves around the possibility of turbine exhaust temperatures reaching below zero Celsius, specifically in the context of a turbine operating under certain inlet and exit conditions. Participants are examining the calculations related to exhaust temperatures and the implications of using different models for the working fluid.
Participants have not reached a consensus on the feasibility of the calculated exhaust temperature or the nature of the working fluid, indicating that multiple competing views remain. The discussion is unresolved regarding the implications of the calculations and the appropriate model to use.
There are limitations regarding the clarity of the OP's calculations, as they have not been provided in the current thread. Additionally, the discussion may depend on the definitions and assumptions related to the working fluid and the thermodynamic model applied.
Instead of making us guess, why don't you post your calculations?Albertov123 said:Could turbine exhaust temperature be negative celsius?
My calculations yield 176 K. Is that possible?
Inlet conditions are 7.8 MPa and 625 K. Exit pressure is 1 atm. (100 kPa.)
CWatters: The OP posted his calculations before this thread was moved to the HW forum, then the calculations disappeared from the thread. As far as I can recall, the working fluid was a van der Waals gas rather than an ideal gas, with certain values given for the constants in the vdW equation of state.CWatters said:Is this a steam turbine?
PS: Check out the forum rules for the homework sections.