Exergy Efficiency Calculation Formulas

Play an AI-generated podcast conversation about this lesson

What type of conditions are fully transient conditions machines or systems more convenient for?

Non-adiabatic conditions (correct)

Endoreversible conditions

Irreversible conditions

Steady state conditions

In the context of exergy efficiency, what has been proved necessary for C.H.P. configurations?

Thermofrigopump efficiency

Irreversible efficiency

Exergy efficiency (correct)

Entropy efficiency

What is the key difference between exergy efficiency of a machine and the corresponding system efficiency?

Adiabatic vs. non-adiabatic operation

Energy consumption

Temperature dependency

Efficiency loss in heat transfer (correct)

Which method has been used for comparison that involves cases of adiabatic and non-adiabatic configurations?

Entropy flux method Signup and view all the answers

What has been done to the objective function in terms of classical efficiencies?

Reevaluation based on energy consumption Signup and view all the answers

What is a significant contribution proposed by the author in terms of extending the classical efficiencies?

Introduction of useful effect criteria Signup and view all the answers

What is the general definition of exergy efficiency?

The ratio of Useful Exergy U.Ex divided by Exergy Consumed Ex.C Signup and view all the answers

In which case could the machine exergy efficiency be one?

Only in the endoreversible case Signup and view all the answers

Which type of system exergy efficiency occurs in both endo and exo reversible cases?

Thermo Frigo Pump system efficiency Signup and view all the answers

What happens to the exergy efficiency when going from machine efficiency to system efficiency?

Decreases Signup and view all the answers

In the context provided, what does 'w + w'' represent?

Heat transfer irreversibilities Signup and view all the answers

What does 'q F' represent in the equations?

Heat Transferred to the Fluid Signup and view all the answers

What does the exergy efficiency of a machine represent?

Internal irreversibilities of the machine Signup and view all the answers

Why is optimization theoretically possible in a thermomechanical machine?

Due to two degrees of freedom Signup and view all the answers

How can unitary cost Ci be related to the dimensions of a machine?

Through heat transfer conductances Signup and view all the answers

What characterizes machine or system performance in the absence of supplementary constraints?

First law efficiency Signup and view all the answers

Why must a constraint be added for reverse cycle machines in optimization?

To bound tC and tF variables Signup and view all the answers

What does optimization of Eq.(14), (15), or (17) give for reverse cycle machines?

Same solution due to intercalation Signup and view all the answers