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In reality the required work input would be even

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Unformatted text preview: ity of steam power plants in electric power generation. If we were to compress the steam exiting the turbine back to the turbine inlet pressure before cooling it first in the condenser in order to “save” the heat rejected, we would have to supply all the work produced by the turbine back to the compressor. In reality, the required work input would be even greater than the work output of the turbine because of the irreversibilities present in both processes. 2 ∫ P dυ 2 wrev = 1 (b) Closed system FIGURE 7–41 Reversible work relations for steady-flow and closed systems. ∫ W = –∫ υ dP W = –∫ υ dP 2 W = – υ dP 1 2 1 2 1 FIGURE 7–42 The larger the specific volume, the greater the work produced (or consumed) by a steady-flow device. cen54261_ch07.qxd 11/18/03 9:57 AM Page 306 306 FUNDAMENTALS OF THERMAL-FLUID SCIENCES In gas power plants, the working fluid (typically air) is compressed in the gas phase, and a considerable portion of the work output of the turbine is consumed by the compressor. As a result, a gas power...
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