AVAILABLE AND UNAVAILABLE ENERGY
The energy content of a system can be divided into two part.- Available energy, which under ideal conditions may be completely converted into work
- Unavailable energy which is usually rejected as waste.
REVERSIBLE WORK IN A NON-FLOW PROCESS
AVAILABILITY
The maximum useful work that can be obtained from the system such that the system comes to a dead state, while exchanging heat only with the surroundings, is known as availability of the system. Here the term dead state means a state where the system is in thermal and mechanical equilibrium with the surroundings.
IRREVERSIBILITY
Work obtained in an irreversible process will always be less than that of a reversible process. This difference is termed as irreversibility (i.e.) the difference between the reversible work and the actual work for a given change of state of a system is called irreversibility.
I=Wrev- Wact
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