Experimental demonstration of a dispatchable latent heat storage system with aluminum-silicon as a phase change material

Jonathan E. Rea*, Christopher J. Oshman, Abhishek Singh, Jeff Alleman, Philip A. Parilla, Corey L. Hardin, Michele L. Olsen, Nathan P. Siegel, David S. Ginley, Eric S. Toberer

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

14 Citations (Scopus)

Abstract

In this work, we present the design, construction, and experimental results of a prototype latent heat thermal energy storage system. The prototype consists of a thermal storage tank with 100 kg of the aluminum-silicon eutectic as a phase change material, a valved thermosyphon that controls heat flow from the thermal storage tank to the power block, and thermoelectric generators for conversion of heat to electricity. We tested the prototype over four simulated days, where each day consisted of four phases of operation: charging, discharging, simultaneous charging and discharging, and storage. Our results show three major conclusions. First, the thermal energy storage system was able to receive and distribute heat with small temperature gradients – less than 5 °C throughout the thermal storage tank. Second, the valved thermosyphon was able to effectively control heat transfer, demonstrating an on/off thermal conductance ratio of 430. Third, the interfaces between subsystems had small temperature drops: of the ∼ 560 °C temperature drop from the thermal storage tank to the heat rejection system, ∼ 525 °C occurred across the power block. This work overcomes the challenges of integrating previously-developed subsystems together, providing a proof-of-concept of this system.

Original languageEnglish
Pages (from-to)1218-1229
Number of pages12
JournalApplied energy
Volume230
DOIs
Publication statusPublished - 15 Nov 2018
Externally publishedYes

Keywords

  • Concentrating solar power
  • Heat pipe
  • Phase change material
  • Thermal energy storage
  • Thermal valve
  • Thermosyphon

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