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Help with refrigeration properties table

  1. May 3, 2009 #1
    Hey guys,

    Just a bit stuck with getting enthalpy values off a table I have in a text book.

    If we look at R-22 for example, the text book gives me different answers than what is available on the net. If I use the values that are given to me on the net I get the correct value.

    The blue ones are what seem to be the correct enthalpys, the red is what my text book has given to me. Why is there always a ~154kJ/kg difference for the enthalpies between my book and the correct answer?(for both saturated liquid and vapour and it seems the same for superheated vapour)
     

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  2. jcsd
  3. May 4, 2009 #2
    enthalpy is defined relative to a reference state, it isnt the absolute value.
     
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