Determine the entropy change of air during this

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Unformatted text preview: 9 Entropy Change of an Ideal Gas Air is compressed from an initial state of 100 kPa and 17°C to a final state of 600 kPa and 57°C. Determine the entropy change of air during this compression process by using (a) property values from the air table and (b) average specific heats. cen54261_ch07.qxd 11/18/03 9:57 AM Page 299 299 CHAPTER 7 T Pa 0k P2 = 600 kPa P2 T2 = 330 K 0 =6 2 AIR COMPRESSOR P1 = Pa 100 k 1 P1 = 100 kPa s T1 = 290 K FIGURE 7–34 Schematic and T-s diagram for Example 7–9. SOLUTION A sketch of the system and the T-s diagram for the process are given in Fig. 7–34. We note that both the initial and the final states of air are completely specified. Assumptions Air is an ideal gas since it is at a high temperature and low pressure relative to its critical-point values. Therefore, entropy change relations developed under the ideal-gas assumption are applicable. Analysis (a) The properties of air are given in the air table (Table A–21). Reading s° values at given temperatures a...
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