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Part-Load Energy Performance Assessment of a Pumped Thermal Energy Storage System for an Energy Community

Author

Listed:
  • Emanuele Nadalon

    (Department of Engineering and Architecture, University of Trieste, 34127 Trieste, Italy)

  • Ronelly De Souza

    (Department of Engineering and Architecture, University of Trieste, 34127 Trieste, Italy
    GITSE-I3A, Department of Mechanical Engineering, Universidad de Zaragoza, 50018 Zaragoza, Spain)

  • Melchiorre Casisi

    (Polytechnic Department of Engineering and Architecture, University of Udine, 33100 Udine, Italy)

  • Mauro Reini

    (Department of Engineering and Architecture, University of Trieste, 34127 Trieste, Italy)

Abstract

Research on pumped thermal energy storage (PTES) has gained considerable attention from the scientific community. Its better suitability for specific applications and the increasing need for the development of innovative energy storage technologies are among the main reasons for that interest. The name Carnot Battery (CB) has been used in the literature to refer to PTES systems. The present paper aims to develop an energy analysis of a CB comprising a high-temperature two-stage heat pump (2sHP), an intermediate thermal storage (latent heat), and an organic Rankine cycle (ORC). From a broad perspective, the CB is modeled considering two types of heat inputs for the HP: a cold reservoir in the ground (at a constant temperature of 12 °C throughout the entire year) and a heat storage at 80 °C (thermally-integrated PTES—TI-PTES). The first part defines simple models for the HP and ORC, where only the cycles’ efficiencies are considered. On this basis, the storage temperature and the kind of fluids are identified. Then, the expected power-to-power (round-trip) efficiency is calculated, considering a more realistic model, the constant size of the heat exchangers, and the off-design operation of expanders and compressors. The model is simulated using Engineering Equation Solver (EES) software (Academic Professional V10.998-3D) for several working fluids and different temperature levels for the intermediate CB heat storage. The results demonstrate that the scenario based on TI-PTES operation mode (toluene as the HP working fluid) achieved the highest round-trip efficiency of 80.2% at full load and 50.6% round-trip efficiency with the CB operating at part-load (25% of its full load). Furthermore, when the HP working fluid was changed (under the same scenario) to R1336mzz(Z), the round-trip full-load and part-load efficiencies dropped to 72.4% and 46.2%, respectively. The findings of this study provide the HP and ORC characteristic curves that could be linearized and used in a thermo-economic optimization model based on a Mixed-Integer Linear Programming (MILP) algorithm.

Suggested Citation

  • Emanuele Nadalon & Ronelly De Souza & Melchiorre Casisi & Mauro Reini, 2023. "Part-Load Energy Performance Assessment of a Pumped Thermal Energy Storage System for an Energy Community," Energies, MDPI, vol. 16(15), pages 1-30, July.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:15:p:5720-:d:1207418
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    References listed on IDEAS

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