Model-based analysis of thermal energy storage for multiple temperature level heat supply

Mirko Nicotra, Matteo Caldera, Pierluigi Leone, Fabio Zanghirella

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Thermal Energy Storages (TES) are widely used in many energy systems and improving their performance has become increasingly important. Various CFD models are currently available, both one-dimensional and multi-dimensional, with different level of accuracy, computational cost and capability to be generalised. This work is aimed at analising the relevant phases, i.e. charge, discharge and low inertial discharge, of a couple of hot water TES characterized by different inlet temperatures and flow rates, with three numerical approaches: 1D, 2D, and a reduced model. In particular, the latter approach provides a simple analytical function for the evaluation of the temperature profile inside the tanks. The numerical models are validated on experimental data obtained from a test bench with two hot water tanks, in which one tank is connected to a micro-CHP while the other is connected to a heat pump, and operated at different temperature levels. The results of the 2D and the reduced models are in good agreement with experiments showing a maximum error lower than 1.2 K during the discharge cycles; nevertheless, the reduced model has a much lower computational cost and the dimensionless nature of the implemented function allows generalising the validity of the results to storage tanks operating at different conditions.
Original languageEnglish
Pages (from-to)288 - 297
Number of pages10
JournalApplied Thermal Engineering
Volume141
DOIs
Publication statusPublished - 1 Aug 2018
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

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