Comprehensive optimization of a novel thermo-hydraulic machine for mechanical power generation
DOI:
https://doi.org/10.24425/ather.2025.154178Abstract
This paper is dedicated to the multi-aspect optimization of a novel thermo-hydraulic machine with liquid piston operating according to organic Rankine cycle, designed for mechanical power generation from low temperature reservoirs. This involves the implementation of thermodynamic and hydraulic analyses. Several issues have been identified in thermohydraulic machines built to date, particularly the limitation imposed by the location of the expansion phase under the equilibrium dome, which constrains maximum output work. This issue is addressed through the application of steam superheating followed by the organic Rankine cycle. The thermodynamic analysis showed that the R1233zd is the most suitable working fluid for the suggested novel machine within the temperature range of 65−130°C. The selection of the best working fluid was followed by the dimensioning of the hydraulic part of the machine under optimal operating conditions. A new parameter was introduced to link the gas and hydraulic sides of the machine. It is about the time scale of the cycle which influences significantly the mechanical output power. Furthermore, mathematical modelling of the hydraulic part of the machine concludes that high mechanical power output can only be achieved only in modes of operation with high thermal efficiencies. Conversely, operational modes with high second law efficiencies fail to deliver high mechanical power levels. These two conclusions can be regarded as equivalent to the various postulates of the second law of thermodynamics.References
[1] Shah, Y.T. (2022). Advanced power generation systems: Thermal sources (1st ed.). CRC Press. https://doi.org/10.1201/9781003328087
[2] Yilmaz, F. (2019). Energy, exergy and economic analyses of a novel hybrid ocean thermal energy conversion system for clean power production. Energy Conversion and Management, 196, 557–566. https://doi.org/10.1016/j.enconman.2019.06.028
[3] Khaligh, A., & Onar, O.C. (2010). Energy harvesting: Solar, wind, and ocean energy conversion systems. CRC Press. https://doi.org/10.1201/9781439815090
[4] Tong, W. (2010). Fundamentals of wind energy. WIT Transactions on State of the Art in Science and Engineering, 44, 3–48. https://doi.org/10.2495/978-1-84564-205-1/01
[5] Igwe, C.I. (2021). Geothermal energy: A review. International Journal of Engineering Research & Technology, 10(3). https://doi.org/10.17577/IJERTV10IS030164
[6] Benti, N.E., Gurmesa, G.S., Argaw, T., Aneseyee, A.B., Gunta, S., Kassahun, G.B., Aga, G.S., & Asfaw, A.A. (2021). The current status, challenges and prospects of using biomass energy in Ethiopia. Biotechnology for Biofuels, 14(1), 209. https://doi.org/10.1186/s13068-021-02060-3
[7] Pan, Y., Yang, F., Zhang, H., Yan, Y., Yang, A., Liang, J., & Yu, M. (2022). Performance prediction and working fluid active design of organic Rankine cycle based on molecular structure. Energies, 15(21), 8160. https://doi.org/10.3390/en15218160
[8] Pan, L., & Wang, H. (2013). Improved analysis of organic Rankine cycle based on radial flow turbine. Applied Thermal Engineering, 61(2), 606–615. https://doi.org/10.1016/j.applthermaleng.2013.08.019
[9] Humphrey, H.A. (1909). An internal-combustion pump, and other applications of a new principle. Proceedings of the Institution of Mechanical Engineers, 77(1). https://doi.org/10.1243/PIME_PROC_1909_077_019_02
[10] Van de Ven, J.D., & Li, P.Y. (2009). Liquid piston gas compression. Applied Energy, 86(10), 2183–2191. https://doi.org/10.1016/j.apenergy.2008.12.001
[11] Van de Ven, J.D. (2009). Mobile hydraulic power supply: Liquid piston Stirling engine pump. Renewable Energy, 34(11), 2317–2322. https://doi.org/10.1016/j.renene.2009.01.020
[12] Motamedi, M., Ahmadi, R., & Jokar, H. (2018). A solar pressurizable liquid piston Stirling engine: Part 1, mathematical modeling, simulation and validation. Energy, 155, 796–814. https://doi.org/10.1016/j.energy.2018.05.002
[13] Ahmadi, R., Jokar, H., & Motamedi, M. (2018). A solar pressurizable liquid piston Stirling engine: Part 2, optimization and development. Energy, 164, 1200–1215. https://doi.org/10.1016/j.energy.2018.08.197
[14] Semmari, H., Stitou, D., & Mauran, S. (2012). A novel Carnot-based cycle for ocean thermal energy conversion. Energy, 43(1), 361–375. https://doi.org/10.1016/j.energy.2012.04.017
[15] Mauran, S., Martins, M., Stitou, D., & Semmari, H. (2012). A novel process for engines or heat pumps based on thermal-hydraulic conversion. Applied Thermal Engineering, 37, 249–257. https://doi.org/10.1016/j.applthermaleng.2011.11.026
[16] Stitou, D. (2013). Transformation, conversion, stockage, transport de l’énergie thermique par procédés thermochimiques et thermo-hydrauliques. Habilitation à Diriger des Recherches, Université de Perpignan. https://tel.archives-ouvertes.fr/tel-00841655
[17] Borgogno, R., Mauran, S., Stitou, D., & Marck, G. (2017). Thermal-hydraulic process for cooling, heating and power production with low-grade heat sources in residential sector. Energy Conversion and Management, 135, 148–159. https://doi.org/10.1016/j.enconman.2016.12.064
[18] Semmari, H., Mauran, S., & Stitou, D. (2017). Experimental validation of an analytical model of hydraulic motor operating under variable electrical loads and pressure heads. Applied Energy, 206, 1309–1320. https://doi.org/10.1016/j.apenergy.2017.10.010
[19] Zebbar, D., Guelib, A., Kherris, S., Zebbar, S., Mostefa, K., & Kaddouri, N. (2019). Thermodynamic study and analysis of thermohydraulic cycle for power generation. Recueil de Mécanique, 3(2), 299–305 (in French). https://doi.org/10.5281/zenodo.2581463
[20] Semmari, H. (2012). Production d’électricité par procédé thermohydraulique: Application à l’exploitation de l’énergie thermique des mers. Thèse de doctorat, Université de Perpignan (in French).
[21] Zebbar, D., Guelib, A., Rahmani, Z., Zebbar, S., & Kherris, S. (2022). Machine thermohydraulique pour la production continue de puissance mécanique avec piston liquide fonctionnant suivant le cycle de Rankine. Algeria, Patent No. 220156.
[22] Martins, M. (2010). Nouveau procédé thermo-hydraulique appliqué au rafraîchissement solaire de l’habitat: Analyse et optimisation thermodynamiques. Thèse de doctorat, Université de Perpignan (in French).
[23] Maalem, Y., Madani, H., & Mehemmai, M. (2023). Modélisation mathématique et simulation numérique des performances de refroidissement de différentes unités de réfrigération à compression de vapeur: application de nouveaux fluides frigorigènes. Revue des Sciences et Sciences de l’Ingénieur, 10(1), 21–39 (in French).
[24] Bell, I.H., Wronski, J., Quoilin, S., & Lemort, V. (2014). Pure and pseudo-pure fluid thermophysical property evaluation and the open-source thermophysical property library CoolProp. Industrial & Engineering Chemistry Research, 53(6), 2498–2508. https://doi.org/10.1021/ie4033999
[25] Borgogno, R. (2017). Procédé thermo-hydraulique solaire appliqué à la trigénération dans le secteur résidentiel. Thèse de doctorat, Université de Perpignan (in French). https://tel.archives-ouvertes.fr/tel-01620245
[26] Çengel, Y.A., & Cimbala, J.M. (2006). Fluid mechanics: Fundamentals and applications. McGraw-Hill Higher Education.
[27] Regin. (2024). GF2/GF3 Rev. C 2- and 3-way DIN-standard flanged valve. https://www.regincontrols.com/globalassets/pimmediafiles/documents/gf2_gf3_ps10097_en.pdf (accessed 7 Jul. 2024).
[28] Savić, V., Knežević, D.M., Lovrec, D., Jocanović, M., & Karanović, V. (2009). Determination of pressure losses in hydraulic pipeline systems by considering temperature and pressure. Strojniški vestnik – Journal of Mechanical Engineering, 55(4), 237–243.
[29] Pirro, D.M., Wessol, A.A., & Wills, J.G. (2001). Lubrication fundamentals (2nd ed.). CRC Press.
[30] OEM Dynamics. (2024). Oil viscosity/temperature chart. https://oemdynamics.us/documents/InstructionBooks/viscosity.pdf (accessed 7 Jul. 2024).
[31] Majumdar, S.R. (2003). Oil hydraulic systems: Principles and maintenance. McGraw-Hill.
[32] Chapple, P. (2002). Principles of hydraulic system design (1st ed.). Coxmoor Publishing Company.
