Cen54261ch07qxd 111803 957 am page 316 316

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Unformatted text preview: a are the required work inputs to the compressor for the reversible isothermal and actual cases, respectively. COMPRESSOR Air Cooling water FIGURE 7–52 Compressors are sometimes intentionally cooled to minimize the work input. cen54261_ch07.qxd 11/18/03 9:57 AM Page 316 316 FUNDAMENTALS OF THERMAL-FLUID SCIENCES EXAMPLE 7–15 Effect of Efficiency on Compressor Power Input Air is compressed by an adiabatic compressor from 100 kPa and 12°C to a pressure of 800 kPa at a steady rate of 0.2 kg/s. If the isentropic efficiency of the compressor is 80 percent, determine (a) the exit temperature of air and (b) the required power input to the compressor. SOLUTION A sketch of the system and the T-s diagram of the process are given in Fig. 7–53. Assumptions 1 Steady operating conditions exist. 2 Air is an ideal gas. 3 The changes in kinetic and potential energies are negligible. 4 The compressor is adiabatic. Analysis (a) We know only one property (pressure) at the exit state, and we need to know one more to fix the state...
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This document was uploaded on 11/28/2012.

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