Ammonia Rankine cycle heat engine calculation

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SUMMARY

The discussion centers on the calculation of an Ammonia Rankine Cycle heat engine, specifically analyzing the turbine entry conditions at 25 Bar and 60 degrees Celsius, and determining the outlet temperature at a turbine outlet pressure of 4 Bar. The output power requirement is 6 Gigawatts, prompting inquiries about the necessary mass flow rate of ammonia. Participants emphasize the importance of utilizing thermodynamic tables and pressure-enthalpy diagrams for accurate calculations, noting that some ammonia may condense in the turbine, which affects the analysis.

PREREQUISITES
  • Understanding of Rankine Cycle thermodynamics
  • Familiarity with ammonia as a working fluid
  • Knowledge of pressure-enthalpy (p-H) diagrams
  • Experience with thermodynamic tables for ammonia
NEXT STEPS
  • Study the thermodynamic properties of ammonia using ammonia thermodynamic tables
  • Learn how to interpret pressure-enthalpy (p-H) diagrams for ammonia
  • Research the calculations involved in determining mass flow rates for Rankine Cycle systems
  • Explore methods for analyzing condensation effects in turbine systems
USEFUL FOR

Engineers, thermodynamicists, and inventors interested in the design and analysis of ammonia-based Rankine Cycle heat engines, particularly those focused on optimizing performance and efficiency.

Biodelta
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Homework Statement
A Rankine Cycle heat engine uses ammonia as a working fluid, turbine entry temperature is 25 Bar at 60 degrees Celsius.

The turbine outlet pressure is 4 Bar, the question is: what is the outlet temperature? and if the output power is 6 Gigawatt (6x10^9 watt) what would the mass flow rate of the ammonia need to be for 6 Gigawatt? output
Relevant Equations
U = Q-W
A Rankine Cycle heat engine uses ammonia as a working fluid, turbine entry temperature is 25 Bar at 60 degrees Celsius.

The turbine outlet pressure is 4 Bar, the question is: what is the outlet temperature? and if the output power is 6 Gigawatt (6x10^9 watt) what would the mass flow rate of the ammonia need to be for 6 Gigawatt? output
 
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What are your thoughts on this so far? What other information/data do you have available? Do you really feel that the Relevant Equation that you listed is the correct one to use?
 
My first approach to solving this has been to use: H'mmm cut and paste from word does not work, I will create a PDF and send that, Regards Stuart, back in a few hours
 
Hello, Attached is my solution which I am looking for confirmation of, it is in PDF attachment.
Thanks for considering this matter.
Regards
Stuart
 

Attachments

Did you not have access to thermodynamic tables on ammonia (analogous to the steam tables) or to a pressure-enthalpy diagram for ammonia like this one: http://industrialheatpumps.nl/en/how_it_works/thermodynamic_cycle/
 
Thanks for that, I am a 67 year old retiree / inventor, and just wanted to get a few questions answered, I am not a student except for a few ideas I have. So my real question is how did the calculation stack up? is it valid? I am just looking at plug and play for this. I am also prepared to pay for a professional opinion.
Cheers
Stuart
 
Biodelta said:
Thanks for that, I am a 67 year old retiree / inventor, and just wanted to get a few questions answered, I am not a student except for a few ideas I have. So my real question is how did the calculation stack up? is it valid? I am just looking at plug and play for this. I am also prepared to pay for a professional opinion.
Cheers
Stuart
The p-H diagram shows that some of the ammonia will condense in the turbine. So your analysis is not correct. You can get your answer however using the p-H diagram.
 

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