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Homework Help: Find the Exit Temperature of the Air in the Compressor

  1. Feb 18, 2013 #1
    1. The problem statement, all variables and given/known data
    Air enters a compressor operating at steady state with a pressure of 14.7 lbf/in2, a temperature of 80°F and a volumetric flow rate of 18 ft3/s. The air exits the compressor at a pressure of 90 lbf/in2. Heat transfer from the compressor to its surroundings occurs at a rate of 9.7 Btu per lb of air flowing. The compressor power input is 90 hp. Neglecting kinetic and potential energy effects and modeling air as an ideal gas, determine the exit temperature in °F.

    2. Relevant equations

    3. The attempt at a solution

    I suspect that I need to use:

    Qcv+m'1(h1+v21/2) = m'2(h2 + v22/2) + Wcv

    Is Qcv = 9.7 Btu/lb and Wcv= 90 hp?
  2. jcsd
  3. Feb 19, 2013 #2


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    How do you expect to find v?
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