Mar 17th 2017, 05:45 AM
Join Date: Mar 2017
Hello, I had it in the exam last week and wanted to make sure I did alright, I think I did a mistake on B) though, but not sure.
I don't know how to write equations and all of that here on the internet, only in papers, but i'll try to explain it in computer writing as much as I can
for A) it wants mass flowrate which is m and dot on top of it.
I used equation of
cause heat is loss so its minus, so therefore the equation is like this with plugging the numbers
For B) I didn't know exactly what to do, but I knew work output is given which is 0.5 MW, it's in MEga Wats, so I did convert it to KiloWats first of all, so what i did basically is i divided it to the m dot that I got from A.
so I did this basically
and cause the /second from Wats which is J/s will cancel out the seconds from Kilogram/s which is from the mass flowrate, the answer that I had was.
= 350.9 KJ/Kg
Please tell me this is right, it weights 10 marks out of the total mark of this semester. if not right tell me what the B solution is, thanks.