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Homework Help: Thermofluids Air Conditioning Unit TS diagram

  1. Mar 11, 2016 #1
    1. The problem statement, all variables and given/known data
    To plot a TS diagram given the relevant data here http://imgur.com/Q9RNL8P for an air conditioning unit.

    2. Relevant equations
    R134a is being used in an air conditioning unit, steam tables for -5hf 0hf and -5sf 0sf written below in exrapolation.

    3. The attempt at a solution
    I've extrapolated the -2.7 to find the base pressure that goes into the evaporator from point 4 here http://imgur.com/zl4eIGJ

    And finally this is my plot from what I understand http://imgur.com/XE4HVtt

    I can see that point one is superheated so wouldn't I take the lower pressure as the -2.7degrees.

    • But the pressure at -2.7 degrees is 2.7006 bar
    • and the pressure of 5.2 degrees is 2.554 bar
    How is the warmer temperature a lower pressure?
    Am I right in setting the bottom pressure line at the -2.7 degrees?

    Thanks for reading I would appreciate any help with this.
  2. jcsd
  3. Mar 16, 2016 #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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