Difference between the various COP formulae

Click For Summary
SUMMARY

The discussion focuses on the differences between various Coefficient of Performance (COP) formulae, specifically addressing the equation COPref = Qc/Win and its alternative form COPref = (h1-h4)/(h2-h1). The user seeks clarity on whether these equations are interchangeable or context-specific. Additionally, the term "isostere" is explored, with the user clarifying that it refers to constant concentration, distinguishing it from related terms like isobar and isotherm.

PREREQUISITES
  • Understanding of thermodynamic principles, particularly the Coefficient of Performance (COP).
  • Familiarity with enthalpy changes in thermodynamic cycles.
  • Knowledge of basic refrigeration and heat pump concepts.
  • Awareness of terminology related to thermodynamic properties, such as isostere, isobar, and isotherm.
NEXT STEPS
  • Research the derivation and applications of the COP formula in refrigeration systems.
  • Study the implications of enthalpy changes in thermodynamic cycles using software like EES (Engineering Equation Solver).
  • Explore the concept of isostere in various scientific contexts, particularly in chemistry and thermodynamics.
  • Investigate different forms of COP equations and their specific applications in engineering scenarios.
USEFUL FOR

Students and professionals in thermodynamics, mechanical engineers, and anyone involved in the design and analysis of refrigeration and heat pump systems.

influx
Messages
162
Reaction score
1

Homework Statement


39d88c.png


Homework Equations


N/A

The Attempt at a Solution


My question is a simple one: how is the above equation for COPref different to the COPref equations I've already encountered (such as COPref = Qc/Win = (h1-h4)/(h2-h1). Is the above just a different form of these? Or is the above only used in specific situations?

Also, one other question. What does ''isostere'' mean exactly? I know isobar means equal pressure and isotherm means equal termperature but can't seem to put my finger on what ''isostere'' means. Wikipedia gives this: https://en.wikipedia.org/wiki/Isostere

But I think that is referring to isostere in a different context?

Thanks
 
Last edited:
Physics news on Phys.org
I edited the above post to include the isostere question but I have now found out that it means constant concentration. However, I can't seem to edit the above post to reflect this hence I decided to post this message.
 

Similar threads

How to calculate a coefficient of performance (COP)
  • · Replies 12 ·
Replies
12
Views
8K
Undergrad Cannot understand formula for molar heat capacities of an ideal gas
  • · Replies 22 ·
Replies
22
Views
4K
Find the difference in pressure between each atmosphere
  • · Replies 1 ·
Replies
1
Views
2K
Difference between ΔG and ΔG° in Thermodynamics
  • · Replies 2 ·
Replies
2
Views
2K
Small sample test for the difference between two means
  • · Replies 1 ·
Replies
1
Views
2K
U-Tube Manometer: What is the Difference in Pressure Between Points B and A?
  • · Replies 3 ·
Replies
3
Views
5K
The difference between strain and strain_y
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Empirical temperature scales using different thermometers
  • · Replies 7 ·
Replies
7
Views
3K
Chemistry How to explain the difference between recompression of ideal gas reversibly and irreversibly after initial irreversible expansion?
  • · Replies 5 ·
Replies
5
Views
3K
Semi empirical mass formula derivation help
  • · Replies 4 ·
Replies
4
Views
2K