• Branko B Pejović, Tehnološki fakultet, Zvornik, Univerzitet u Istočnom Sarajevu, Bosnia and Herzegovina
  • Mitar D Perušić, Tehnološki fakultet, Zvornik, Univerzitet u Istočnom Sarajevu, Bosnia and Herzegovina
  • Vladan D Mićić, Tehnološki fakultet, Zvornik, Univerzitet u Istočnom Sarajevu, Bosnia and Herzegovina
  • Goran S Tadić, Tehnološki fakultet, Zvornik, Univerzitet u Istočnom Sarajevu, Bosnia and Herzegovina
  • Stefan M Pavlović, Tehnološki fakultet, Zvornik, Univerzitet u Istočnom Sarajevu, Bosnia and Herzegovina

One Possibility for Graphical Representation of Real Gas Energy Values for Characteristic Change of the State

  • In this paper, for the case of isothermal quasistatic characteristic change of the state of real gas is given graphical representation respectively determination of the most important energy values in h-s and T-s diagrams. At present, by using the fundamental theorem of differential calculus, the first and second law of thermodynamics is written in differential form, dependence is derived that allowed precise graphic design to determine the most important values of the process (technical work and amount of exchanged heat) to h-s diagram, over certain straight lines which represent the height differences. Performed graphic design, is applied to two typical cases in the same diagram. Also, a comparison is per formed with same change of state in the case of an ideal gas. In the second part of this paper, starting from the fact that for the behavior of real gas, co-ordinate systems h, s and T, s are suitable but p, v systems, the proposal is given to the graphic representation of the changes of enthalpy and internal energy in heat T-s diagram. In this case, it is used the lines of constant enthalpy and internal energy i. e. that is their point of intersection with isobars, which passing through the end point of analyzed the change of state. It is shown that the change of enthalpy and internal energy in T-s diagram can be presented planimetry over the appropriate areas. Based on the certain change of enthalpy and internal energy, by using the both form of the first law in thermodynamic, it is shown that in addition to the amount of exchanged heat, but it is possible for volume and technical work, for the proposed change of state of real gas, also can be represented graphically in T-s diagram, over suitable equivalent areas, which was the basic idea of this paper. Dis played graphics solutions in relation to the analytical solutions allows more efficient theoretical study of thermodynamic process which is observed from different points, they significantly assist for clear understanding of the problem and improve of mutual understanding.
  • Keywords
    real gases and vapors, isothermal quasistatic change, energy thermodynamic values, T-s and h-s diagrams, differential calculus, graphical representation of values, graphical construction
  • Pages
    11 - 25
  • Submitted
    04/03/2013
  • Revised
    07/27/2013
  • Accepted
    07/27/2013
  • BIBLID
    0350-218X, 39 (2013), 1-2, 11-25
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