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PROBLEM: Turbine connected via adiabatic valve to air supply

  1. Sep 15, 2009 #1
    1. The problem statement, all variables and given/known data

    Air turbine used to drive a application in a machine shop is supplied with air
    from the factory air supply main where the conditions are 0.6 MN/m^2 and 31 ºCthrough an adiabatic throttle valve which reduces the pressure to 0.3 MN/m^2. In the turbine the air expands further adiabatically to atmospheric pressure of
    0.1013 MN/m^2 and -10 ºC. Calculate the required air flow to produce a power output of 0.8 kw. If the turbine were replaced by a reciprocating air motor having the same power output and expanding the air accordingly to the law pV^n = k
    between the same initial and final states, the air still being throttled before
    entering the motor find the index n and the percentage reduction in air flow rate.

    2. Relevant equations

    dQ - dW = dU
    dh = du + d(pv) = 0 (for adiabatic process)

    3. The attempt at a solution
     
  2. jcsd
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