Question

Discuss the topic of exergy what doesit reprsent ? what does the exergy balance tell us ? how can we use exergy analysis ?

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Answer 1

Exergy (also known as availability) is the maximum possible work that can be obtained from a cycle of a heat engine. The maximum possible work is obtained in a reversible process.Exergy is the tool, which indicates how far the system departs from equilibrium state.It to determine the potential for useful work in a certain amount of energy; otherwise the exergy is the portion of energy that can be transformed into useful work.Exergy balance for a closed system can be developed by combining the energy and entropy balances for a closed system

When a closed system undergoes a process from state 1 to state 2, its energy and entropy balances are

Energy Balance:               
Entropy Balance:   

When a closed system undergoes a process from state 1 to state 2, its energy and entropy balances are

Energy Balance:               
Entropy Balance:   

• The first term is the exergy transfer by heat.
• The second term is the exergy transfer by work.

Exergy analysis used to determine type ,location and magnitude of energy location in a system.

used to find means to reduce losses to make the energy system more efficient.

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