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Archived Mixing steam at different pressures

  1. Apr 20, 2013 #1
    1. The problem statement, all variables and given/known data
    steam flow through a line is 3.5 kg/s at 650 kps and .9 dry. It enters a mixing line where it exits at 800kpa, dry and saturated. The mixing steam is throttle from 2000kps to 800kpa. What is the mass of throttling steam added to have a final mixture of 800 kpa dry steam.


    2. Relevant equations
    steam tables
    q=mcΔT


    3. The attempt at a solution

    @650: hf=684 hfg=2076 hg=2552
    @800: hf=721 hfg=2048 hg=2769
    @2000:hf=908 hfg=1890 hg=2798
     
  2. jcsd
  3. Feb 4, 2016 #2
    To do this, we need to assume that the throttled steam was saturated. Otherwise the problem can't be solved.

    Enthalpy rate of entering 650 kpa stream = 3.5((0.1)(684)+(0.9)(2552))=8278.2 kJ/s
    Specific enthalpy of 2000 kPa steam = 2798 kJ/kg
    Specific enthalpy of 800 kPa product steam =2769 kJ/kg

    From heat balance on system, 8278.2 + 2798 w = (3.5+w) 2769

    w = 48.7 kg/s
     
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