1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Liquefying nitrogen

  1. Apr 5, 2014 #1

    Maylis

    User Avatar
    Gold Member

    ImageUploadedByPhysics Forums1396753337.687284.jpg

    Sorry for the template not being present, when I use my phone it doesn't show up. I am trying the problem about liquefying liquid nitrogen, and I am having my first problem finding the latent heat of vaporization at 280.6 K. I try using trouton's rule, and I get a domain error because the inside is negative with a power of 0.38.


    I can't really tell if my drawing is right, I am assuming that the order in which it enters the system is a throttle valve, then a heat exchanger. Some vapor leaves the system, which is the combined throttle valve and heat exchanger, before entering the heat exchanger. Then, the rest goes through the heat exchanger.
     

    Attached Files:

    Last edited: Apr 5, 2014
  2. jcsd
  3. Apr 6, 2014 #2

    Maylis

    User Avatar
    Gold Member

    Here is a new attempt, this time I made the inlet condition the reference. I am still stuck about the vaporization enthalpy using troutons rule and getting a negative number due to the reduced temperature being greater than unity

    ImageUploadedByPhysics Forums1396764658.823847.jpg
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Liquefying nitrogen
Loading...