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Design of a bench-scale ammonia-SrCl2 thermochemical storage system using numerical modelling
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. (Thermal Energy Storage)ORCID iD: 0000-0002-1806-9749
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
Technical University of Denmark - DTU. (Energy Conversion and Storage)
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration. (Thermal Energy Storage)ORCID iD: 0000-0001-9556-552X
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2019 (English)In: Eurotherm Seminar #112 - Advances in Thermal Energy Storage, Lleida, 2019, article id D128Conference paper, Published paper (Other academic)
Abstract [en]

This work presents the numerical modelling of a bench-scale thermochemical storage (TCS) system based on the reversible absorption-desorption of ammonia in strontium chloride. The modelling is performed using the ASPEN software and was validated against experimental data from literature on a different TCS system configuration but using the same reaction pair. The modelled TCS system in this work comprises two identical reactors, alternatively operating as absorber or desorber with a storage capacity of 0.5 kWh. The system is designed to store and release heat under 8 bar of NH3 pressure, with the two identical reactors respectively undergoing desorption at 82 °C and absorption at 79 °C. Together with the two reactors, a liquid ammonia storage tank is used as a buffer (10 bar at 25 oC). The desorption half-cycle of the system is made of the desorber (82 °C, 8 bar), a compressor (8-10 bar), a cooler (108-25 °C), a pump (to pump liquid ammonia) and the liquid ammonia storage (25 °C, 10 bar). The absorption half-cycle starts form the liquid ammonia storage tank and goes via an expansion valve (10-8 bar) and then a heater (18-25 °C) towards the absorber (79 °C, 8 bar). In the model, the desorption and absorption are respectively driven by an external heater and cooler, which represent a waste heat source and a heat sink respectively. The efficiency of the TCS system was found to be of 67 % and 61 % for the absorption and desorption half-cycles, respectively. A sensitivity analysis was also conducted to identify optimum operating conditions. In conclusion, this study presents an ammonia-SrCl2 TCS bench-scale system that allows simultaneous heat storage and retrieval, as the basis for the practical construction of the system. This is expected to provide inspiration and operational analysis to accommodate the design of similar TCS systems for storing surplus industrial heat.

Place, publisher, year, edition, pages
Lleida, 2019. article id D128
Keywords [en]
thermochemical storage (TCS), NH3-SrCl2 system, absorption, desorption, numerical modelling, Aspen
National Category
Energy Systems
Research subject
Energy Technology; Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-251919ISBN: 978-84-9144-155-7 (print)OAI: oai:DiVA.org:kth-251919DiVA, id: diva2:1317450
Conference
Eurotherm Seminar #112 : Advances in thermal energy storage, 15-17 May 2019, University of Lleida, Spain
Projects
Neutrons for Heat Storage (NHS)- A Nordforsk project
Funder
NordForsk
Note

QC 20190523

Available from: 2019-05-22 Created: 2019-05-22 Last updated: 2019-05-23Bibliographically approved

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