# TAILIEUCHUNG - Lecture Companion site to accompany thermodynamics: An engineering approach (7/e): Chapter 8 - Yunus Çengel, Michael A. Boles

## Chapter 8 - Exergy: A measure of work potential. After studying this chapter you will be able to: Examine the performance of engineering devices in light of the second law of thermodynamics; define exergy (also called availability), which is the maximum useful work that could be obtained from the system at a given state in a specified environment; define reversible work, which is the maximum useful work that can be obtained as a system undergoes a process between two specified states;. | Chapter 8 Exergy: A Measure of Work Potential Study Guide in PowerPoint to accompany Thermodynamics: An Engineering Approach, 7th edition by Yunus A. Çengel and Michael A. Boles The energy content of the universe is constant, just as its mass content is. Yet at times of crisis we are bombarded with speeches and articles on how to “conserve” energy. As engineers, we know that energy is already conserved. What is not conserved is exergy, which is the useful work potential of the energy. Once the exergy is wasted, it can never be recovered. When we use energy (to heat our homes, for example), we are not destroying any energy; we are merely converting it to a less useful form, a form of less exergy. Exergy and the Dead State The useful work potential of a system is the amount of energy we extract as useful work. The useful work potential of a system at the specified state is called exergy. Exergy is a property and is associated with the state of the system and the .

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