Heat release characteristics of a latent heat storage heat exchanger by scraping the solidified phase change material layer

Nobuhiro Maruoka, Taichi Tsutsumi, Akihisa Ito, Miho Hayasaka, Hiroshi Nogami

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Latent heat storage (LHS) is one of the key methods to level renewable energy and utilize waste heat. In this method, heat is stored as latent heat of the phase change material (PCM) during melting. Releasing the stored heat in PCM consumes considerable time because the heat release rate is slow when a solidification layer of PCM is formed on the heat transfer wall during the heat release period. The authors have proposed a new mechanism for rapid heat exchange in LHS, i.e., by scraping the solidified PCM layer on the heat transfer wall. In this mechanism, the heat transfer wall is a rotating cylindrical tube to which a fixed blade is attached. During the heat release period, PCM is solidified on the tube, and the solidified layer is immediately removed using the fixed blade. In this study, a laboratory-scale setup with 1 kg of sodium acetate tri-hydrate as PCM was developed, and the effect of rotation rate on the heat release rate was experimentally examined. The results showed that the heat release rate during rotation accelerated by more than 100 times compared with the rate without rotation, and it increased with the rotation rate of the cylindrical tube.

Original languageEnglish
Article number118055
JournalEnergy
Volume205
DOIs
Publication statusPublished - 2020 Aug 15

Keywords

  • High-performance heat exchanger
  • Latent heat storage
  • Phase change material
  • Scraping the solidified layer
  • Thermal heat storage

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Pollution
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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