Ammonia Rankine cycle heat engine calculation

[Biodelta]

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

 

[Chestermiller]

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?

 

[Biodelta]

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

 

[Biodelta]

Hello, Attached is my solution which I am looking for confirmation of, it is in PDF attachment.
Thanks for considering this matter.
Regards
Stuart

 

[Chestermiller]

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/

 

[Biodelta]

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

 

[Chestermiller]

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.