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Homework Help: Thermodynamics property calculation

  1. Oct 2, 2013 #1
    1. The problem statement, all variables and given/known data

    Air has a temperature of 227 Celsius and a pressure of 1000 kPa. Determine the internal energy, quality, enthalpy, and specific volume if it exists.

    2. Relevant equations

    A state is defined by two properties. All other properties can be derived from two independent properties.

    3. The attempt at a solution

    Ok so in theory two independent properties define the state, so I should be able to do this problem. Problem is there are no formulas relating them.....I am totally lost right now. I only know the concept, but have no tools. Anyone help me pls.
  2. jcsd
  3. Oct 2, 2013 #2


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    Gold Member

    If I had to guess, I think you are allowed to assume the air is an ideal gas, and then use the formulas for an ideal gas to figure out what you need to.
  4. Dec 16, 2015 #3
    you can get the formulas by polynomial fitting. The orginal data can be calculated from www.eThermo.us
  5. Dec 16, 2015 #4


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    Staff Emeritus
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    Homework Helper

    The OP was looking for an answer 2 years ago. He either found it by now or ...

    Please check the dates in the thread before posting (or necro posting) to a thread which is months, if not years, old.
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