Thermodynamics property calculation

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Discussion Overview

The discussion revolves around calculating thermodynamic properties of air given its temperature and pressure. The focus is on determining internal energy, quality, enthalpy, and specific volume, with an emphasis on the theoretical framework and practical application of equations related to ideal gases.

Discussion Character

  • Homework-related, Technical explanation

Main Points Raised

  • The original poster (OP) expresses confusion about how to derive the necessary properties from the given temperature and pressure, noting a lack of formulas.
  • One participant suggests assuming air behaves as an ideal gas and using the corresponding formulas to find the required properties.
  • Another participant mentions the possibility of obtaining formulas through polynomial fitting and refers to a specific website for thermodynamic data.
  • A later reply comments on the age of the original post, implying that the OP may have resolved their question by now.

Areas of Agreement / Disagreement

No consensus is reached on the approach to solve the problem, as participants offer differing methods and assumptions regarding the behavior of air.

Contextual Notes

There are limitations regarding the assumptions made about air as an ideal gas, and the discussion does not resolve the mathematical steps necessary for the calculations.

xzibition8612
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Homework Statement



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.

Homework Equations



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

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.
 
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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.
 
you can get the formulas by polynomial fitting. The orginal data can be calculated from www.eThermo.us
 
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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