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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

SECOND LAW ANALYSIS OF THERMAL ENERGY STORAGE SYSTEMS

Get access (open in a dialog) DOI: 10.1615/IHTC7.2410
pages 473-478

Sinopsis

This parer presents a thorough discussion of an important class of thermal energy storage systems suitable for use by electric utilities, viewed as devices whose primary function is to store exergy (availability). The presentation includes both a-conventional energy analysis (first law analysis) and an exergy analysis (second law analysis). The set of governing equations which results from these analyses was solved numerically for several cases of practical interest. The solutions show that the fraction of the amount of exergy carried into the storage unit with a hot gas source which can be stored in a large tank of liquid and the fraction which is destroyed as a result of irreversibilities (related to heat transfer through the finite ΔT between hot gas and liquid and to the frictional pressure drop associated with flow through the heat exchanqer) are each considerably smaller than previously reported in the heat transfer literature. The presentation concludes with a discussion of the optimal performance of such storage systems from both the thermal and economic viewpoints.