Performance Analysis and Optimization of Compressed Air Energy Storage Integrated with Latent Thermal Energy Storage

Xiaoli Yu, Wenbo Dou, Zhiping Zhang, Yan Hong, Gao Qian, Zhi Li*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Recovering compression waste heat using latent thermal energy storage (LTES) is a promising method to enhance the round-trip efficiency of compressed air energy storage (CAES) systems. In this study, a systematic thermodynamic model coupled with a concentric diffusion heat transfer model of the cylindrical packed-bed LTES is established for a CAES system, and the numerical simulation model is validated by experimental data in the reference. Based on the numerical model, the charging–discharging performance of LTES and CAES systems is evaluated under different layouts of phase change materials (PCMs) in LTES, and the optimal layout of PCM is specified as a three-stage layout, since the exergy efficiency of LTES and round-trip efficiency are improved by 8.2% and 6.9% compared with a one-stage layout. Then, the proportion of three PCMs is optimized using response surface methods. The optimization results indicate that the exergy efficiency of LTES and round-trip efficiency of the CAES system are expected to be 80.9% and 73.3% under the PCM proportion of 0.48:0.3:0.22 for three stages, which are 7.0% and 13.1% higher than the original three-stage PCMs with equal proportions.
Original languageEnglish
Article number2608
Number of pages19
JournalEnergies
Volume17
Issue number11
DOIs
Publication statusPublished - 28 May 2024

Keywords

  • underground energy storage
  • compressed air energy storage
  • latent thermal energy storage
  • compression waste heat recovery

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