American Journal of Modern Physics

Submit a Manuscript

Publishing with us to make your research visible to the widest possible audience.

Propose a Special Issue

Building a community of authors and readers to discuss the latest research and develop new ideas.

The Thermodynamics Cycles with a Reversible Chemical Reaction

The relevance: In the modern world, there is an urgent need for the efficient use of all possible heat sources for the subsequent production of mechanical work or electrical energy. The gradual depletion of fossil fuels on the planet is bringing humanity closer to a large-scale energy crisis. Since the conversion of heat into freely convertible work or electrical energy is possible with the help of heat engines, it is necessary to look for new ways to improve them. One of these ways can be the use of thermodynamic cycles with reversible chemical reactions. The main aim of the investigation of thermodynamic cycles with reversible chemical reactions, comparison and analysis of the results obtained and formulation of conclusions. Object: thermodynamic cycles of Carnot, Brighton and Stirling; mixtures of gases capable of changing their composition as a result of a reversible chemical reaction; chemical work. Methods: solving the problem of finding the efficiency coefficient using analytical methods solving the problem of finding the efficiency coefficient using analytical methods. Results: A Brighton, Carnot and Stirling thermodynamic cycles is considered in which the working substance is a chemically reacting gas with molar weight and heat capacity changing as a result of a reversible chemical reaction. By way of example, the reactions N2 + 3H2 →2NH3 and CO + 2H2 ↔ CH3OH is considered. For a constant heat supply, the cycles is characterized by the lower (Tlow) and upper (Ttop) temperature boundaries of existence; between these boundaries, the efficiency η can change from 0 to 1. Such peculiar properties are manifested because of two factors: reversibility of the chemical reaction and the special role of the chemical work in the conversion of heat into mechanical work, which minimizes the heat loss to the surrounding space in a closed thermodynamic cycles. The possibility of achieving a thermal efficiency in them equal to 1 in a limited temperature range does not depend on the type of cycle. The value of efficiency in Carnot and Stirling machines depends on the method of heat supply and removal at isotherms. Each of the Carnot, Stirling and Brighton cycles is characterized, respectively, by its parameter αC, αSt and αBr, which determines the condition for achieving efficiency η = 1. Heat engines operating on thermodynamic cycles with reversible chemical reactions are most efficient when using low potential heat sources.

Thermodynamic Cycle, Reversible Chemical Reaction, Chemical Work, Efficiency

APA Style

Kanysh Sabdenov. (2023). The Thermodynamics Cycles with a Reversible Chemical Reaction. American Journal of Modern Physics, 12(2), 14-20. https://doi.org/10.11648/j.ajmp.20231202.11

ACS Style

Kanysh Sabdenov. The Thermodynamics Cycles with a Reversible Chemical Reaction. Am. J. Mod. Phys. 2023, 12(2), 14-20. doi: 10.11648/j.ajmp.20231202.11

AMA Style

Kanysh Sabdenov. The Thermodynamics Cycles with a Reversible Chemical Reaction. Am J Mod Phys. 2023;12(2):14-20. doi: 10.11648/j.ajmp.20231202.11

Copyright © 2023 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

1. I. P. Bazarov, Thermodynamics (Pergamon, New York, 1964).
2. A. P. Baskakov, B. I. Berg, O. K. Vitt, Yu. V. Kuznetsov, and N. F. Filippovskii, Heat Engineering (Energoatomizdat, Moscow, 1991) [in Russian].
3. R. Andriani, F. Gamma, and U. Ghezzi. (2011). Thermodynamic Analysis of a Turboprop Engine with Intercooling and Heat Recovery. Trans. Jpn. Soc. Aeronaut. Space Sci. 54 (183), 44. https://doi.org/10.2322/tjsass.54.44
4. Y. Cui and K. Deng. (2014). Thermodynamic model and optimization of a miller cycle applied on a turbocharged diesel engine. J. Therm. Sci. Technol. 9 (1). https://doi.org/10.1299/jtst.2014jtst0001
5. K. O. Sabdenov, M. Erzada, and A. T. Suleimenov. (2019). The Possibility of Converting Energy in Space with the Aid of a Chain Heat Machine Operating on Methane and Nitrogen. J. Eng. Phys. Thermophys. 92 (3), 574. https://doi.org/10.1007/s10891-019-01965-z
6. T. Kanda, M. Sato, T. Kimura, and H. Asakawa. (2018). Expander and Coolant-Bleed Cycles of Methane-Fueled Rocket Engines. Trans. Jpn. Soc. Aeronaut. Space Sci. 61 (3), 106 (2018). https://doi.org/10.2322/tjsass.61.106
7. E. Takahashi, H. Kojim, and H. Furutani. (2015). Advanced ignition technology for the achievement of high thermal efficiency of internal combustion engine. Synth. Engl. Edit. 8 (4), 187. https://doi.org/10.5571/syntheng.8.4_187
8. J. Nizar, M. Mukai, R. Kagawa, H. Nakakura, O. Moriue, and E. Murase. (2012). Amelioration of combustion of hydrogen rotary engine. Int. J. Automot. Eng. 3 (3), 81. https://doi.org/10.20485/jsaeijae.3.3_81
9. T. Fukui, T. Shiraishi, T. Murakami, and N. Nakajima. (1999). Study on high specific power micro-Stirling engine. JSME Int. J., Ser. B. 42 (4), 776. https://doi.org/10.1299/jsmeb.42.776
10. Sh. Kojima. (2019). Performance of Curzon-Ahlborn engine along with its engine speed and compression ratio. J. Therm. Sci. Technol. 14 (2), JTST0024. https://doi.org/10.1299/jtst.2019jtst0024
11. H. Fujiki, Ch. Nakagawa, Y. Takeda, and H. Cho. (2016). Fabrication and output power characteristic of a pulley-type SMA heat-engine with the cooling mechanism contained in pulley. Trans. Mater. Res. Soc. Jpn. 41 (3), 285. https://doi.org/10.14723/tmrsj.41.285
12. K. O. Sabdenov. (2021). Effect of Molar Mass Variation on a Flame Temperature and a Burning Rate. Combust., Explos. Shock Waves, 57 (1), 46. https://doi.org/10.1134/S0010508221010056
13. Ya. B. Zel’dovich, G. I. Barenblatt, V. B. Librovich, and G. M. Makhviladze, Mathematical Theory of Combustion and Explosions. Consultants Bureau, New York, 1985.
14. K. O. Sabdenov. (2021). The thermodynamic Brayton cycle with a reversible chemical reaction. Tech. Phys. 66, 1275–1283. https://doi.org/10.1134/S1063784221090164
15. Vargaftik N. B. Handbook of thermophysical properties of liquids and gases. Moscow: Nauka, 1972 [in Russian].
16. G. Walker. Stirling-cycle machines. University of Calgary, Canada. Clarendon Press, Oxford, 1973.
17. Wentworth W. E., Chen E. (1976). Simple thermal decomposition reactions for storage of solar thermal energy. Sol. Energy. 18, 205. doi: 10.1016/0038-092X(76)90019-0.
18. Williams O. M. (1980). A comparison of reversible chemical reactions for solar thermochemical power generation. Revue Phys. Appl. 15 (3), 453. DOI: https://doi.org/10.1051/rphysap:01980001503045300
19. Egenolf-Jonkmanns B., Bruzzano St., Deerberg G., et all. (2012). Low temperature chemical reaction systems for thermal storage. Energy Procedia. (30), 235. DOI: https://doi.org/10.1016/j.egypro.2012.11.028
20. Jun Li, T. Zeng, N. Kobayashi, et all. (2019). Lithium Hydroxide Reaction for Low Temperature Chemical Heat Storage: Hydration and Dehydration Reaction. Energies. 12 (19), 3741. DOI: https://doi.org/10.3390/en12193741