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Homework Help: Thermodynamics: Polytropic Process

  1. Sep 2, 2015 #1
    1. The problem statement, all variables and given/known data

    Q1- 0.15 kg of air (Ideal) compressed in a polytropic process (PV1.5=C) from 0.06 m3 to 0.01 m3. If the initial pressure was 0.25 MPa. Determine:

    1- The initial temperature and the final pressure.

    2- The work done during the process.

    2. Relevant equations

    P1 V1 = m R T
    P1 V11.5= P2V21.5=C
    W1-2= (P2V2 - P1V1)/(1-n)

    3. The attempt at a solution

    P2= P1(V1/V2)1.5= 0.25*103(0.06/0.01)1.5

    P2=3674.23 kPa --> The final pressure

    T1= (P1V1)/(mR)=(0.25*103*0.06)/(0.15*0.287)

    T1=348.43 K --> The initial temperature

    W1-2= (P2V2 - P1V1)/(1-n) = (3674.23*0.01 - 0.25*103*0.06)/(1-1.5)

    W1-2= -43.48 Kj --> The work during the process
  2. jcsd
  3. Sep 7, 2015 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
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