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Homework Help: Archived Initial and Final Conditions

  1. Oct 13, 2013 #1
    1. The problem statement, all variables and given/known data

    Given: A sealed, rigid container (cannot change shape or size) containing steam at the shown conditions has heat added until it reaches the final shown state.

    Determine: a) heat added, b) work performed, c) change in internal energy of the system, and d) final system pressure

    2. Relevant equations

    Q = W + Δu

    Also given: T1= 200 deg C, mass = 10kg, volume = 1m^3 (for initial conditions)
    T2 = 350 C (for final conditions)

    The pressures I found in the thermo tables for the corresponding temperatures are:
    P1 = 1554.9 KPa
    P2 = 16529 KPa

    3. The attempt at a solution

    What I know is it's a saturated vapor system since it stated steam in the problem statement and closed system so no work is done.

    From that I was able to answer b) W = 0 and c) Q = 0 + m(u1-u2) --> 10Kg(2594.2-2418.3) KJ/kg = 1759 KJ of internal energy. The u's I got from thermo tables.

    The two I'm having a hard time with is a) the heat added to the system and d) final system pressure.
  2. jcsd
  3. Feb 7, 2016 #2
    First of all, the "conditions" are not mentioned. But we can proceed nevertheless.

    The OP answered (b) and (c). The answer of (a) is but the answer of (c). The answer to (d) can be obtained using the ideal gas equation.
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