What Does Extensity Mean in Endoreversible Thermodynamics?

  • Thread starter Thread starter babbagee
  • Start date Start date
  • Tags Tags
    article
Click For Summary
SUMMARY

The discussion centers on the concept of extensity in Endoreversible Thermodynamics, specifically addressing the distinction between extensive and intensive variables. Participants clarify that 'extensity' refers to extensive variables, such as entropy, which scale with system size, while 'intensity' pertains to intensive variables, like temperature, which do not. The notion of endoreversible systems indicates that irreversible processes can be modeled as energy exchanges between reversible subsystems, with transport equations capturing the irreversible aspects.

PREREQUISITES
  • Understanding of thermodynamic principles, particularly the laws of thermodynamics.
  • Familiarity with the concepts of extensive and intensive variables.
  • Knowledge of Endoreversible Thermodynamics and its applications.
  • Basic grasp of transport equations in thermodynamic systems.
NEXT STEPS
  • Research the differences between extensive and intensive variables in thermodynamics.
  • Study the principles of Endoreversible Thermodynamics in detail.
  • Examine transport equations and their role in modeling irreversible processes.
  • Explore case studies of endoreversible engines and their efficiencies.
USEFUL FOR

This discussion is beneficial for thermodynamics students, researchers in energy systems, and professionals interested in the modeling of irreversible processes in thermodynamic cycles.

babbagee
Messages
71
Reaction score
0
I am doing a project for my thermodynamics class and I have decided to do it on Endoreversible Thermodynamics. I Have read a few articles but I am having some difficulty understanding parts of it. I have not read the whole article, still in the beginning. But from the intro are they saying that Endoreversible engines overall are irreversible but can be broken down to multiple subsystems, which are reversible? Secondly I am having a hard time understanding what they mean by the use of the word extensity or extensities . Any help would be greatly Appreciated.

sorry totally forgot to link the article.

http://www.qucosa.de/fileadmin/data/qucosa/documents/5641/data/Masterarbeit.pdf

Thank you in advance
 
Last edited:
Science news on Phys.org
I quickly scanned the first 2 sections, 'extensity' seems to mean 'extensive variable', and 'intensity' means 'intensive variable'. For example, the entropy is extensvie (since doubling the size of the system doubles the entropy), but temperature is intensive- it remains the same.

The concept of endoreversible seems to be that irreversible systems can be approximated by directed fluxes of energy between reversible systems- the transport equations contain all the 'irreversible parts' of the system.
 

Similar threads

What does it mean to specify the extensive state of an ideal gas?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad How can a process be isentropic but not reversible or adiobatic?
  • · Replies 2 ·
Replies
2
Views
4K
Undergrad What Does Falsifiability Mean in the Context of Science?
  • · Replies 26 ·
Replies
26
Views
3K
Recommendation for project related to thermodynamics
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Proof of thermodynamic stability condition
  • · Replies 4 ·
Replies
4
Views
3K
Extensive / Intensive variables in thermodynamics
  • · Replies 3 ·
Replies
3
Views
2K
What exactly does the proposed 4th law of thermodynamics mean?
  • · Replies 3 ·
Replies
3
Views
1K
Chemistry Entropy in isolated composite system for irreversible process
  • · Replies 3 ·
Replies
3
Views
2K
Chemistry Show that book levitation by absorption of heat violates 2nd law
  • · Replies 13 ·
Replies
13
Views
3K
Chemistry What does the differential of U mean in an irreversible process?
  • · Replies 11 ·
Replies
11
Views
2K