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Thermal energy storage combined with a temperature boost: An underestimated feature of thermochemical systems

Stengler, Jana and Linder, Marc (2020) Thermal energy storage combined with a temperature boost: An underestimated feature of thermochemical systems. Applied Energy, Volume (114530). Elsevier. doi: 10.1016/j.apenergy.2020.114530. ISSN 0306-2619.

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Official URL: http://www.sciencedirect.com/science/article/pii/S0306261920300428

Abstract

The scientific community largely agrees on both the potential of as well as the need for thermal energy storage (TES) in energy-efficient industrial processes. However, state-of-the-art TES technologies (latent or sensible) have one unsolved issue in common: whenever thermal energy is transferred, e.g. between the heat transfer fluid in an industrial application and the TES, the temperature of the transferred heat decreases. Consequently, even if TES systems perfectly de-couple the temporal correlation between the availability of excess heat, and, e.g., the demand for process heat, the stored heat cannot directly be re-integrated in the same process due to the temperature loss caused by two heat transfers. Here, we report on the development of a thermochemical TES system based on the reversible gas-solid reaction of strontium bromide with water vapor as a reference reaction system. This concept allows for an increase in the temperature of the stored energy without additional process steps, and thereby for a full compensation of the thermal downgrade. The temperature lift is adjustable by variation of the steam pressure, and hence can be adapted to various industrial applications. For example, we charged the storage at 180 °C (1 kPa steam pressure) and discharged it at 280 °C (560 kPa steam pressure), effectively using the module as a heat transformer in addition to the storage function. We present a scalable TES design operating on a 1 kW-scale with 30 min charging and discharging times and an optional temperature boost of up to 100 K.

Item URL in elib:https://elib.dlr.de/134021/
Document Type:Article
Title:Thermal energy storage combined with a temperature boost: An underestimated feature of thermochemical systems
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Stengler, JanaJana.Stengler (at) dlr.dehttps://orcid.org/0000-0001-6124-8286
Linder, Marcmarc.linder (at) dlr.deUNSPECIFIED
Date:March 2020
Journal or Publication Title:Applied Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:Volume
DOI :10.1016/j.apenergy.2020.114530
Publisher:Elsevier
ISSN:0306-2619
Status:Published
Keywords:Thermal energy storage; Thermochemical heat transformation; Thermal upgrade; Strontium bromide; Waste-heat recovery; Energy efficiency
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Thermal Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes (Storage) (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Stengler, Jana
Deposited On:05 Feb 2020 10:59
Last Modified:05 Feb 2020 10:59

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