New Thermochemical Salt Hydrate System for Energy Storage in Buildings

Yana Galazutdinova, Ruby-Jean Clark, Said Al-Hallaj, Sumanjeet Kaur and Mohammed Farid ()
Additional contact information
Yana Galazutdinova: NETenergy LLC, Chicago, IL 60615, USA
Ruby-Jean Clark: NETenergy LLC, Chicago, IL 60615, USA
Said Al-Hallaj: NETenergy LLC, Chicago, IL 60615, USA
Sumanjeet Kaur: Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
Mohammed Farid: Department of Chemical and Materials Engineering, University of Auckland, Auckland 1010, New Zealand

Energies, 2024, vol. 17, issue 20, 1-20

Abstract: This paper introduces an innovative design for an “inorganic salt-expanded graphite” composite thermochemical system. The storage unit is made of a perforated, compressed, expanded graphite block impregnated with molten CaCl 2 ∙6H 2 O; the humid air passes through the holes that allow the moisture to diffuse and react with the salt. The prepared block underwent 90 hydration-dehydration cycles. Although most of the performed cycles were carried out with salt overhydration and deliquescence, the treated samples have remained mechanically and thermally stable with no drop in energy density. The volumetric energy density of the composite ranged from 135.5 to 277.6 kWh/m 3 , depending on airflow rate and absolute humidity. To ensure composite material cycling stability, the energy density of the block was measured during hydration at similar conditions of absolute humidity, inlet temperature, and airflow rate (0.01 kg water /kg air , 20 °C, 400 l/min). The average energy density at these conditions was sustained at 219 kWh/m 3 . The block integrity was monitored by visual inspection after removing it from the reactor chamber every few cycles. Both the composite material and its manufacturing process are simple and easy to scale up for future commercialization.

Keywords: thermochemical energy storage; salt hydrate; expanded graphite; calcium chloride; energy density; thermal efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/17/20/5228/pdf (application/pdf)
https://www.mdpi.com/1996-1073/17/20/5228/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:17:y:2024:i:20:p:5228-:d:1503039

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().