Exergy Analysis of Thermal Energy Storage With Specific Remarks on the Variation of the Environmental Temperature

Energy storage is a key technology for many purposes and in particular for air conditioning plants and a successful exploitation of solar energy. Thermal storage devices are usually classified as either variable temperature (“sensible heat”) or constant temperature (“latent heat”) devices. For both...

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Bibliographic Details
Published in:Journal of solar energy engineering 1996-05, Vol.118 (2), p.81-88
Main Author: Bisio, G
Format: Article
Language:English
Subjects:
Air conditioning
Applied sciences
Efficiency
Energy
Energy efficiency
Energy storage
Energy. Thermal use of fuels
Enthalpy
Exact sciences and technology
Exergy
Fluid mechanics
Fluids
Latent heat
Mathematical models
Q1
Solar energy
Storage
Temperature
Transport and storage of energy
Variations
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Summary:Energy storage is a key technology for many purposes and in particular for air conditioning plants and a successful exploitation of solar energy. Thermal storage devices are usually classified as either variable temperature (“sensible heat”) or constant temperature (“latent heat”) devices. For both models a basic question is to determine the efficiency suitably: Only exergy efficiency appears a proper way. The aim of this paper is to examine exergy efficiency in both variable and constant temperature systems. From a general statement of exergy efficiency by the present author, two types of actual definitions are proposed, depending on the fact that the exergy of the fluid leaving the thermal storage during the charge phase can be either totally lost or utilized elsewhere. In addition, specific remarks are made about the exergy of a system in a periodically varying temperature environment.
ISSN:0199-6231
1528-8986
DOI:10.1115/1.2848020