EFFICIENCY OF THE REGENERATIVE CYCLE OF BRIGHTON WITH VARIABLE THERMOPHYSICAL PROPERTIES OF THE WORKING FLUID (Part 2)


  • A.A. Khalatov Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine
  • S.D. Severin Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine
  • O.S. Stupak Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine
  • O.V. Shihabutinova Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine
Keywords: Brighton cycle with heat recovery, variable thermophysical properties of the working fluid, efficiency

Abstract

The data about thermodynamic efficiency of the ideal Brighton cycle with heat regeneration with constant thermophysical properties of the working fluid, as well as the Brighton cycle with heat recovery and the wetting of the working fluid at the inlet to the turbine (with variable thermophysical properties of the working fluid). The inapplicability of comparison of the thermal efficiency of the Brighton cycle with heat recovery and the wetting of the working fluid at the inlet to the turbine with the thermal efficiency of the equivalent ideal Carnot cycle is shown.

The analysis of the thermodynamic efficiency of an ideal regenerative Brighton cycle with a decrease in the working body at the entrance to the turbine allows us to make the following conclusions:

  1. With the growth of the mass moisture content of the working fluid when entering the turbine, the thermal efficiency of the regenerative cycle increases, but decreases with an increase in the degree of increase in the pressure level in the cycle.
  2. High values ​​of the thermal efficiency of the cycle () can be achieved with relatively small values ​​of the degree of increase in the pressure in the cycle () and high (up to d = 0,5) values ​​of the mass moisture content of the working body when entering the turbine.
  3. It is shown that under certain conditions the thermal efficiency of the regenerative cycle with the decrease of the working body when entering the turbine may be greater than the thermal efficiency of a similar ideal Carnot cycle, which does not contradict the second law of thermodynamics, since the condition for the implementation of the Carnot cycle is the immutability of the thermophysical properties of the working body in a loop In this regard, the use of the expression for the thermal efficiency of the ideal Carnot cycle is not used as a criterion for assessing the efficiency of cycles of power plants with highly variable thermophysical properties of the working fluid.
  4. It is also shown that the thermal efficiency of the regenerative cycle with the decrease of the working body when entering the turbine is always lower than the thermal efficiency of the equivalent non-equilibrium Carnot cycle with a change in the specific heat of the working fluid, which corresponds to the second law of thermodynamics.
  5. It is shown that the Brighton regenerative cycle with a decrease in the working body before the turbine can be represented as a conditional cycle with a higher maximum temperature of the cycle, which, depending on the mass content of the moisture content of the working body, can in 1,2 ... 2,5 times exceed the actual maximum temperature cycle, which determines the high values ​​of its thermal efficiency.

References

1. Burdakov V.P., Dzyubenko B.V., Mysnyankin S.Yu., Mihaylova T.V., [Thermodynamics: a textbook for high schools.]. Moscow: Drofa, 2009. Vol. 1. 479 p., Vol. 2. 361 p. [in Russian].
2. Burtsev S.I., Tsvetkov Yu.N. [Wet air. Composition and properties: Tutorial.] St. Petersburg: SPb GAHPT. 1998. 146 p. [in Russian].
3. Novikov I.I. [Thermodynamics: A manual for students of power engineering and heat engineering specialties of technical colleges.] Moscow: Mashinostroenie [Mechanical engineering], 1984.592 p. [in Russian].
4. Kudinov V.A., Kartashov E.M. [Technical thermodynamics. Textbook for technical colleges.] Moscow: Vysshaya shkola [High school], 2000. 261 p. [in Russian].
5. Arseniev L.V. & Tyryshkina V.G. (Ed.). [Gas turbine installations: design and calculation: Reference guide.] Leningrad: Mashinostroenie [Mechanical engineering], 1978. 232 p. [in Russian].
6. Khalatov A.A., Kovalenko A.S., Severin S.D., Kovalenko G.V. [Possibilities of increasing the efficiency of air heat utilization for gas turbine drives.] Promyshlennaya teplotekhnika [Industrial Heat Engineering], 2015. V. 37. № 6. P. 21–30. [in Russian].

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PDF Downloads: 10
Published
2018-12-18
How to Cite
Khalatov, A., Severin, S., Stupak, O., & Shihabutinova, O. (2018). EFFICIENCY OF THE REGENERATIVE CYCLE OF BRIGHTON WITH VARIABLE THERMOPHYSICAL PROPERTIES OF THE WORKING FLUID (Part 2). Thermophysics and Thermal Power Engineering, 41(3), 5-13. https://doi.org/https://doi.org/10.31472/ttpe.3.2019.1
Section
Heat and Mass Transfer Processes and Equipment, Theory and Practice of Drying