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Techno-economic evaluation and cost-efficiency optimization of novel thermally integrated pumped thermal energy storage system using ejector-expansion heat pump

Author

Listed:
  • Jing, Dongmei
  • Shawabkeh, Ali
  • Chauhan, Bhupendra Singh
  • Moria, Hazim
  • Ayed, Hamdi
  • Mouldi, Abir

Abstract

Pumped thermal energy storage is increasingly recognized as a promising long-duration energy storage technology due to its geographic flexibility, cost competitiveness, and environmental compatibility. Conventional thermally integrated pumped thermal energy storage systems employing vapor-compression heat pumps coupled with organic Rankine cycles are limited in power-to-power efficiency. To overcome these limitations, this study develops and analyzes two novel configurations: (i) a system integrating an ejector-expansion heat pump, and (ii) a further improved design with a booster-assisted ejector-expansion heat pump. A comprehensive thermo-economic model is established, validated with literature data, and applied to quantify charging power, discharging performance, levelized cost of storage, and the power-to-power efficiency. Influence of key design variables on systems’ behavior are appraised via a comprehensive parametric analysis. The results show that ejector-expansion heat pump integration reduces compressor power demand and relative to the standard heat pump, while the booster-assisted system achieves the highest efficiency and lowest cost of storage. Multi-objective optimization based on efficiency and storage cost confirms that the booster-assisted configuration offers the most favorable trade-off in terms of both technical and economic criteria. Under optimal operation, the booster-assisted ejector-expansion heat pump-based system reaches 5.07 percentage-points more efficiency and 6.65% less cost of energy storage rather than the standard system.

Suggested Citation

  • Jing, Dongmei & Shawabkeh, Ali & Chauhan, Bhupendra Singh & Moria, Hazim & Ayed, Hamdi & Mouldi, Abir, 2026. "Techno-economic evaluation and cost-efficiency optimization of novel thermally integrated pumped thermal energy storage system using ejector-expansion heat pump," Renewable Energy, Elsevier, vol. 267(C).
    • Handle: RePEc:eee:renene:v:267:y:2026:i:c:s0960148126005586
    DOI: 10.1016/j.renene.2026.125733
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