Cascade thermochemical storage with internal condensation heat recovery for better energy and exergy efficiencies

N’Tsoukpoe, Kokouvi Edem, Thomas Osterland, Oliver Opel and Wolfgang K.L. Ruck

Applied Energy, 2016, vol. 181, issue C, 562-574

Abstract: Thermochemical heat storage processes generally involve significant condensation heat rejection to the environment during charging. This heat rejection is about two thirds of the charging heat of salt hydrates, which are a promising class of materials for heat storage in the low temperature range, i.e. for space heating and domestic hot water production. We showed that internal condensation heat recovery through a new concept of a cascade thermochemical heat storage process leads to an improvement of the energy and exergy efficiencies of the process. To illustrate the potential of this new concept, we compare a classical thermochemical based heat storage with one involving internal condensation heat recovery. In order to have an unbiased comparison basis, the two processes have similar boundary temperature conditions. The energy and exergy efficiencies of the process with internal heat recovery is as much as 1.8 times that of the classical thermochemical heat storage process. The process with heat recovery requires only 55% of the energy input at high temperature during charging of the classical process, for the same discharging heat output.

Keywords: Cascade thermochemical storage; Thermochemical heat storage; Thermodynamic design; Energy efficiency; Condensation heat recovery; Exergy efficiency; Kaskadierte thermochemische Speicherung; Thermochemische Wärmespeicherung; Thermodynamische Auslegung; Energieeffizienz; Kondensationswärmerückgewinnung; Exergieeffizienz; Stockage thermochimique en cascade; Stockage thermochimique; Optimisation thermodynamique; Efficacité énergétique; Récupération de la chaleur de condensation; Efficacité exergétique (search for similar items in EconPapers)
Date: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (15)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0306261916311886
Full text for ScienceDirect subscribers only

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:eee:appene:v:181:y:2016:i:c:p:562-574

Ordering information: This journal article can be ordered from
http://www.elsevier.com/wps/find/journaldescription.cws_home/405891/bibliographic
http://www.elsevier. ... 405891/bibliographic

DOI: 10.1016/j.apenergy.2016.08.089

Access Statistics for this article

Applied Energy is currently edited by J. Yan

More articles in Applied Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().