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A Functional Thermochemical Energy Storage System for Mobile Applications: Design and Performance Analysis

Authors: Jure Galović, Peter Hofmann


Thermochemical energy storage (TCES), as a long-term and lossless energy storage principle, provides a contribution for the reduction of greenhouse emissions of mobile applications, such as passenger vehicles with an internal combustion engine. A prototype of a TCES system, based on reversible sorption reactions of LiBr composite and methanol has been designed at Vienna University of Technology. In this paper, the selection of reactive and inert carrier materials as well as the design of heat exchangers (reactor vessel and evapo-condenser) was reviewed and the cycle stability under real operating conditions was investigated. The performance of the developed system strongly depends on the environmental temperatures, to which the reactor vessel and evapo-condenser are exposed during the phases of thermal conversion. For an integration of the system into mobile applications, the functionality of the designed prototype was proved in numerous conducted cycles whereby no adverse reactions were observed.

Keywords: Mobile applications, LiBr composite, methanol, performance of TCES system, sorption process, thermochemical energy storage.

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[1] M. Jakobi and P. Hofmann, “Residual Heat Utilisation in Vehicles by Thermochemical Energy Storage,” Motortechnische Zeitschrift (MTZ), no. 77, 2016, pp. 44–49.
[2] M.-M. Druske et al., “Developed Materials for Thermal Energy Storage: Synthesis and Characterization,” Energy Procedia, vol. 61, Jan. 2014, pp. 96–99.
[3] F. Trausel, A.-J. de Jong, and R. Cuypers, “A Review on the Properties of Salt Hydrates for Thermochemical Storage,” Energy Procedia, vol. 48, 2014, pp. 447–452.
[4] K. E. N’Tsoukpoe, T. Schmidt, H. U. Rammelberg, B. A. Watts, and W. K. L. Ruck, “A systematic multi-step screening of numerous salt hydrates for low temperature thermochemical energy storage,” Applied Energy, vol. 124, Jul. 2014, pp. 1–16.
[5] J. Galovic, F. Havlik, and P. Hofmann, “Modular Thermochemical Heat Storage for Engine Preheating,” ATZ, Nov. 2018 pp. 96–101.
[6] M. Jakobi and P. Hofmann, “Restwärmenutzung im Fahrzeug durch thermochemische Energiespeicher,” in Proc. FVV Spring Conference, Germany, 2015.
[7] M. Jakobi, “Entwicklung eines thermochemischen Wärmespeichers auf Basis von Salzhydraten zur Verwendung in Kraftfahrzeugen” Dissertation, Institut für Fahrzeugantriebe und Automobiltechnik der TU Wien, Wien, 2015.
[8] P. A. J. Donkers, L. C. Sögütoglu, H. P. Huinink, H. R. Fischer, and O. C. G. Adan, “A review of salt hydrates for seasonal heat storage in domestic applications,” Applied Energy, vol. 199, Aug. 2017 pp. 45–68.
[9] P. Hofmann and F. Havlik, “Heat Recovery in Passenger Cars by Thermochemical Heat Storage Materials.” in Proc. FVV Spring Conference, Germany Project no. 1155, 2018.
[10] N. Yu, R. Z. Wang, and L. W. Wang, “Sorption thermal storage for solar energy,” Progress in Energy and Combustion Science, vol. 39, no. 5, Oct. 2013, pp. 489–514.
[11] K. E. N’Tsoukpoe, H. Liu, N. Le Pierrès, and L. Luo, “A review on long-term sorption solar energy storage,” Renewable and Sustainable Energy Reviews, vol. 13, no. 9, Dec. 2009, pp. 2385–2396.
[12] A. Fopah Lele, “A Thermochemical Heat Storage System for Households: Thermal Transfers Coupled to Chemical Reaction Investigations,” Dissertation, Leuphana University of Lüneburg, Germany, 2015.
[13] International Union of Pure and Applied Chemistry, Ed., International thermodynamic tables of the fluid state. 12: Methanol. Oxford: Pergamon Press, 1993.