CSP plants with thermocline thermal energy storage and integrated steam generator – Techno-economic modeling and design optimization

A. Pizzolato, F. Donato, V. Verda, M. Santarelli, Adriano Sciacovelli

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)
255 Downloads (Pure)

Abstract

Although CSP has reached technological maturity, high capital investment and specific electricity cost remain the major development barriers. To reduce them, highly efficient, integrated, and cheaper CSP components are urgently needed. In this paper, we investigate a novel CSP plant configuration with a single-tank Thermal Energy Storage (TES) fully integrated with the steam generator.

The objective of this research is twofold: i) provide a reliable model of single-tank thermal storages with integrated steam generator; ii) identify two optimized CSP plant designs to achieve best energetic and economic performances. To achieve these aims we developed a numerical model of the main system components and validated it against experimental data. This model was then integrated in a full simulation and heuristic design optimization of the plant.

The results revealed that the system proposed can generate electricity in middle-Italy (Rome) at a cost of 230.25 $/MWh with a 15% reduction compared to the double tank option. Furthermore, if cogeneration is used to recover the waste heat, this system is an interesting option for users such as small districts, university campuses and hospitals. In the latter case, the optimized system pays off in 6 years and covers 80% of the heating and cooling requirements.
Original languageEnglish
Pages (from-to)231-246
JournalEnergy
Volume139
Early online date1 Aug 2017
DOIs
Publication statusPublished - 15 Nov 2017

Keywords

  • concentrated solar power
  • integrated steam generator
  • molten salts
  • techno-economic optimization
  • thermocline energy storage

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