Overall balance vs. differential balance

  • Thread starter gfd43tg
  • Start date
  • #1
gfd43tg
Gold Member
953
49
Hello,

when doing mass and/or energy balances, how does one know when one should use a differential balance over a total balance? It would help when knowing how to approach a given problem.
 

Answers and Replies

  • #2
Bystander
Science Advisor
Homework Helper
Gold Member
5,279
1,337
Experience. Do it both ways until you see the differences.
 
  • #3
21,628
4,911
I think what Bystander is saying is that, if you have enough information to do the overall balance(s) and don't need to know details within the equipment, then you can use the overall balance. But, if you are missing information to do the overall balance, and the differential balance can provide that information, then you need to do the differential balance.

Chet
 
  • #4
Bystander
Science Advisor
Homework Helper
Gold Member
5,279
1,337
Is there a universal set of rules? No. Any rough, general principles that can be commonly applied? "Small differences between large numbers argue for differential methods."
What balances are interesting/useful/relevant for the system being analyzed? Pipeline: mass out/mass in (a tough problem in custody transfer). Gold mining: recovered metal mass/ore mass or tailings mass/ore mass. Coal desulfurization: sulfur mass/coal mass or treated coal mass/untreated coal mass.
The approach to the problem is dictated by the problem statement.
 

Related Threads on Overall balance vs. differential balance

  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
3
Views
4K
  • Last Post
Replies
9
Views
5K
Replies
3
Views
2K
  • Last Post
Replies
2
Views
3K
Replies
1
Views
2K
Replies
2
Views
3K
Replies
1
Views
10K
  • Last Post
Replies
4
Views
6K
  • Last Post
Replies
1
Views
7K
Top