Isobaric, Isochoric and Supercritical Thermal Energy Storage in R134a

TitleIsobaric, Isochoric and Supercritical Thermal Energy Storage in R134a
Publication TypeConference Paper
Year of Publication2013
AuthorsFurst, Benjamin I., Adrienne S. Lavine, Reza Baghaei Lakeh, and Richard E. Wirz
Conference NameASME 2013 International Mechanical Engineering Congress and Exposition, IMECE 2013
Date Published11/2013
Conference LocationSan Diego, CA
Keywordsisobaric, isochoric, R134a, supercritical, thermal energy storage
AbstractThe effective thermal energy density of R134a subjected to an isobaric or isochoric process is determined and evaluated in the two-phase and supercritical regimes. The results are qualitatively extended to other fluids via the principle of corresponding states. It is shown that substantial increases in volumetric energy density can be realized in the critical region for isobaric processes. Also, for isobaric processes which utilize the full enthalpy of vaporization at a given pressure, there exists a pressure at which the volumetric energy density is a maximum. For isochoric processes (supercritical and twophase), it is found that there is no appreciable increase in volumetric energy density over sensible liquid heat storage; the effective specific heat can be enhanced in the two-phase, isochoric regime, but only with a significant reduction in volumetric energy density.

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