Ammonia Rankine cycle heat engine calculation

  • Thread starter Biodelta
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  • #1
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
 

Answers and Replies

  • #2
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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?
 
  • #3
Biodelta
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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
 
  • #4
Biodelta
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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

  • Physics Forum Question.pdf
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  • #5
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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/
 
  • #6
Biodelta
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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
 
  • #7
22,428
5,266
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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