ISSN Online: 2377-424X
ISBN Print: 0-89116-299-2
International Heat Transfer Conference 7
SECOND LAW ANALYSIS OF THERMAL ENERGY STORAGE SYSTEMS
Abstrakt
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.