EXPERIMENTAL STUDY ON THERMAL STORAGE PERFORMANCE OF CYLINDRICALLY ENCAPSULATED PCM IN A CYLINDRICAL STORAGE TANK WITH AXIAL FLOW


Wickramaratne C., Moloney F., PIRASACI T., Kamal R., Goswami D. Y. , Stefanakos E., ...More

ASME Power Conference (POWER2016), Charlottetown, Canada, 26 - 30 June 2016 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Doi Number: 10.1115/power2016-59427
  • City: Charlottetown
  • Country: Canada
  • Gazi University Affiliated: No

Abstract

A lab-scale packed-bed system was used to test an industry scalable latent heat thermal energy storage (TES) system suitable for supplementing heat to a steam powered cycle. Metallic cylindrical capsules were filled with a eutectic of sodium sulfate (Na2SO4) and potassium chloride (KCl) as the phase change material (PCM) for energy storage. The packed bed system consisted of a cylindrical storage tank with the cylindrical capsules arranged vertically. This system was modeled and validated. The charging and discharging efficiencies of different operating parameters were analyzed. The calculated ratio of exergy to energy efficiency was around 90%. The overall efficiency of the bed, however, was found to be low due to the losses through the packed bed. Possible losses and limitations of the system were analyzed, and recommendations were made for improved designs.