Long-term solar thermal energy storage using aqueous calcium chloride

Josh A. Quinnell, Jane H. Davidson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The development of a thermal storage tank that supplies both long-term thermochemical and short-term sensible storage for solar hot water and space heating is reported. The thermochemical storage is based on the absorption of water by aqueous calcium chloride, a non-toxic and inexpensive liquid desiccant. Compared to water storage, the dual purpose tank provides 2.35 times the amount of energy storage per volume. Water, diluted, and concentrated calcium chloride solutions are stored in a single tank. In this paper we summarize numerical modeling and experimental work on a lab prototype that demonstrate the performance during transient charging operation. Reported data include concentration distributions, streamlines, and mass transfer rates over a relevant range of the governing dimensionless parameters. Analysis of the measured results demonstrate that the absorption storage time constant is on the order of 160 days or longer, suggesting that this concept is a promising development for solar thermal space heating systems in need of seasonal storage.

Original languageEnglish (US)
Title of host publicationWorld Renewable Energy Forum, WREF 2012, Including World Renewable Energy Congress XII and Colorado Renewable Energy Society (CRES) Annual Conference
Pages727-734
Number of pages8
StatePublished - Dec 31 2012
EventWorld Renewable Energy Forum, WREF 2012, Including World Renewable Energy Congress XII and Colorado Renewable Energy Society (CRES) Annual Conference - Denver, CO, United States
Duration: May 13 2012May 17 2012

Publication series

NameWorld Renewable Energy Forum, WREF 2012, Including World Renewable Energy Congress XII and Colorado Renewable Energy Society (CRES) Annual Conferen
Volume1

Other

OtherWorld Renewable Energy Forum, WREF 2012, Including World Renewable Energy Congress XII and Colorado Renewable Energy Society (CRES) Annual Conference
CountryUnited States
CityDenver, CO
Period5/13/125/17/12

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    Quinnell, J. A., & Davidson, J. H. (2012). Long-term solar thermal energy storage using aqueous calcium chloride. In World Renewable Energy Forum, WREF 2012, Including World Renewable Energy Congress XII and Colorado Renewable Energy Society (CRES) Annual Conference (pp. 727-734). (World Renewable Energy Forum, WREF 2012, Including World Renewable Energy Congress XII and Colorado Renewable Energy Society (CRES) Annual Conferen; Vol. 1).