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Homework Help: Condensing steam

  1. Oct 12, 2011 #1
    1. The problem statement, all variables and given/known data
    If we have a containment sprayed by a subcooled water to condense the steam, the pressure decreased from 5 bar to 4 bar, calculate the amount of sprayed water required as a minimum to decrease this pressure?
    Heat of vaporization 2550 kJ/Kg, steam at saturated condition, subcooling 70c and C=4kJ/kg-k which is constant over pressure and temperature.

    2. Relevant equations

    3. The attempt at a solution

    at 1 kg we have Q=2550kJ ,

    Q=mC(T2-T1)------> m=2550kJ/((4kJ/kgk)x(100-70)K)=21.25 Kg!!

    do you agree with me?
  2. jcsd
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