Topology optimization for heat transfer enhancement in Latent Heat Thermal Energy Storage

Research output: Contribution to journalArticlepeer-review

Authors

Colleges, School and Institutes

External organisations

  • Polytechnic University of Turin
  • University of Colorado Boulder

Abstract

Performance of a Latent Heat Thermal Energy Storage depends strongly on the spatial layout of high conductive material and phase change material. Previous design studies have explored a limited design space and have rarely taken advantage of any formal optimization approach. This paper presents a topology optimization framework of a Thermal Energy Storage system involving phase change. We solve the Stefan problem for solidification with a fixed grid finite element method based on the apparent heat capacity technique, while the topology optimization problem is formulated using a density-based method. This approach allows to identify design trends that have been rarely investigated in the past. Firstly, we explore the inherent trade-off between discharged energy and required time for complete discharge. We obtain very different designs and highly varying performances at selected Pareto points. Secondly, by comparing results obtained in two and three dimensions we observe that 3D designs allow superior performances by presenting features that are not apparent in 2D. Thirdly, we propose a formulation of the design problem that yields a nearly constant thermal power output during the entire discharge process. If the maximum discharge time is sufficiently large, the optimized design presents fins that are disconnected from the internal tube.

Details

Original languageEnglish
Pages (from-to)875-888
Number of pages14
JournalInternational Journal of Heat and Mass Transfer
Volume113
Early online date12 Jun 2017
Publication statusPublished - Oct 2017

Keywords

  • Heat transfer enhancement, Phase change material, Thermal Energy Storage, Topology optimization