Title: Application of temperature-distribution models to evaluate the energy and exergy of stratified thermal storages

Authors: Marc A. Rosen

Addresses: Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, Ontario L1H 7K4, Canada

Abstract: Vertical stratification occurs in many thermal energy storages, and is often promoted to increase efficiency. Six temperature-distribution models for vertically stratified Thermal Energy Storage (TES) systems are described and applied for determining their energy and exergy efficiencies. The models are Linear, Stepped, Continuous-linear, Basic Three-zone, General Three-zone and General-linear. The models are intended to allow accurate yet relatively simple determinations of TES energy and exergy while providing physical meaning and understanding. An application of the temperature distribution models to a TES is presented. The results are expected to assist in the design and improvement of TES systems.

Keywords: exergy efficiency; energy efficiency; thermal energy storage; TES systems; stratification; efficiency; models; temperature distribution modelling.

DOI: 10.1504/IJEX.2006.009780

International Journal of Exergy, 2006 Vol.3 No.3, pp.239 - 254

Published online: 10 May 2006 *

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