Numerical Modelling and Performance Analysis of a Packed Bed Electric Thermal Energy Storage System Integrated with a Rankine Cycle
Author
Olesen, Jakob Nørregård
Term
4. term
Education
Publication year
2025
Submitted on
2025-05-28
Pages
69
Abstract
The transition towards renewable energy sources necessitates efficient energy storage solutions to balance supply and demand fluctuations. This thesis presents a numerical modeling and performance analysis of a packed bed thermal energy storage (PBTES) system integrated with a Rankine cycle. The study develops a one-dimensional, transient numerical model to simulate temperature evolution and heat transfer during charging and discharging cycles. The model is validated against existing reference data from a PBTES facility, demonstrating its reliability in predicting system behavior. A parametric sensitivity analysis is conducted exploring the effects of particle size, mass flow rate, and void fraction on temperature distribution and pressure loss. To evaluate system performance during discharge, both single-pressure and Dual- Pressure (DP) Rankine cycles are integrated with a Heat Recovery Steam Generator, and metrics such as thermal efficiency, power output, and round-trip efficiency are assessed. The integration of a DP Rankine cycle improves heat recovery while maintaining a thermal efficiency of approximately 36%. In conclusion, this thesis demonstrates the viability of a packed bed thermal energy storage system integrated with a Rankine cycle for flexible, grid-scale energy storage
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