Notes%2010.25.10

Notes%2010.25.10 - Remember the First Law of...

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1 Remember the First Law of Thermodynamics? Q - W = E (closed system) The equals sign is important- we can convert one form of energy to another. This law places no restriction on an energy conversion other than equality. Open system statement is the same
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2 2nd Law of Thermodynamics will help us: determine direction of change for a process, establish the final equilibrium state, define ideal performance for energy conversion devices, determine the quality of energy, determine if a process is irreversible, and define an absolute temperature scale.
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3 2nd Law of Thermodynamics It informs about quality of energy and direction of flow; thus, it will be stated in terms of inequalities . It’s a non-conservation law It will typically be negatively stated - tell us what we can’t do No one statement covers all facets of the second law
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4 2nd Law of Thermodynamics It has implications for economics, theology and philosophy, and other fields. These make fun and interesting discussions…however, we’ll focus on engineering applications of 2nd law. It is a matter of experience, of observations of what happens in nature….experimental evidence.
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5 A sample of statements regarding direction of processes All spontaneous processes result in a more probable state. Heat energy cannot of itself pass from a colder to hotter body. Once you open a can of worms, the only way to recan them is with a larger can.
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6 Clausius Statement of 2nd Law of Thermodynamics: It is impossible to operate a cyclic device in such a manner that the sole effect external to the device is the transfer of heat from one heat reservoir to another at a higher temperature.
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Notes%2010.25.10 - Remember the First Law of...

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