The Engine - transferred per cycle: A measure of the...

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The Engine The basic operation cycles of an engine consist of extracting heat from a reservoir, performing work, and supplying heat to another reservoir (see Figure 19.1). After one complete cycle the gas in the system returns to its original state. Since it has the same temperature at the beginning and at the end of the cycle, its internal energy did not change. The first law of thermodynamics tells us that the net work done per cycle therefore must equal the net heat
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Unformatted text preview: transferred per cycle: A measure of the performance of an engine is its thermal efficiency e, which is defined as the ratio of the work done per cycle and the heat absorbed per cycle A 100% efficiency will be obtained if and only if Q C = 0. However, the second law of thermodynamics clearly states that it is impossible to change heat completely into work. Thus, there are no perfect engines. Figure 19.1. The engine....
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This document was uploaded on 11/25/2011.

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