4 replies to this topic

[alfirin]

Dear all,

I am trying to produce the grand composite curves for two different problems, which can been seen in the two pictures attached.

In both cases, the only data available are shown in the pictures. I can also use steam tables, which are given during the exam. The grand composite curves do not need necessarily to be produced in scale.

These are previous exam questions and I am not sure how to answer them. I have been taught to produce the grand composite curve when I am given the tota site profiles. This occasion is, however, different.

It is the only major part of my module, which I cannot solve so any help will be appreciated!

Thanks in advance.

Attached Files

•  Utility1.jpg   48.48KB   30 downloads
•  Utility2.jpg   30.84KB   26 downloads

[Zauberberg]

Have a look at this thread and the materials attached therein:

http://www.cheresour...pinch-analysis/

[alfirin]

Have a look at this thread and the materials attached therein:

http://www.cheresour...pinch-analysis/

Thank you a lot. I have seen this thread before, but it wasn't really helpful to me. I did some calculations on my own and I attached them as a pdf. Could someone have a look and tell me if I'm thinking correctly? My diagrams are not the really detailed, but I guess they are good enough to show what I mean.

Regards

Attached Files

•  GCC.pdf   147.62KB   26 downloads

[pavanayi]

Alfirin,

Check your math..

110*(1000/3600)*(3301-1214) = 63.77 MW

So it might be better to check all other calcs too !!!

BTW.. the methodology is proper. It makes sense.. I cant find any scales on your x axis on the T-H diagram, so I have not focused much on that figure.

Also, you might want to state the new VHP demand in TPH, rather than enthalpy

Edited by pavanayi, 09 May 2011 - 10:10 AM.

[alfirin]

Alfirin,

Check your math..

110*(1000/3600)*(3301-1214) = 63.77 MW

So it might be better to check all other calcs too !!!

BTW.. the methodology is proper. It makes sense.. I cant find any scales on your x axis on the T-H diagram, so I have not focused much on that figure.

Also, you might want to state the new VHP demand in TPH, rather than enthalpy

Thank you for your quick comment.

I wasn't paying much attention to calculations and graphs at this stage. I wanted to see if my methodology and my way of thinking are correct. I will do the calculations again and post them. I will also try to solve the second one, which is slightly different than the first.

Regards