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High temperature thermochemical heat transformation based on SrBr2

Stengler, Jana and Ascher, Torsten and Linder, Marc (2017) High temperature thermochemical heat transformation based on SrBr2. 12th IEA Heat Pump Conference 2017, 14.-18. Mai 2017, Rotterdam, Niederlande.

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Abstract

Currently, state of the art working fluids of conventional heat pumps are limited to maximum output temperatures of 140 °C, and thus cannot fulfill the need for high temperature heat pumps in industrial applications. This is why thermochemical reaction systems have come into the focus of interest: they offer the potential of high temperature energy storage and heat transformation, e.g. by making use of the pressure dependency of a gas-solid reaction. These reactions can in general be described by the following equation: A(s) + B(g) ⇌ AB(s) + ΔRH. Variation of the pressure of the gaseous reactant B results in a temperature shift of the exothermic reaction. In this way, the exothermic reaction (energy output) can be performed at higher temperatures than the endothermic reaction (energy input). In this contribution, the thermodynamic principle of thermally driven heat transformation and its main difference with respect to conventional or sorption based heat pumps is outlined. The scope of this work is the potential of the SrBr2–H2O system as a possible candidate for thermochemical heat transformation. Constraints for a suitable reactor geometry and the possibility to combine thermal upgrade and thermal energy storage into one system are analyzed. Experimental results from a laboratory scale test reactor (~ 1,000 g) support the proof of concept of heat transformation in the region of 200 °C.

Item URL in elib:https://elib.dlr.de/112661/
Document Type:Conference or Workshop Item (Speech)
Title:High temperature thermochemical heat transformation based on SrBr2
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Stengler, JanaJana.Stengler (at) dlr.dehttps://orcid.org/0000-0001-6124-8286
Ascher, Torstentorsten.ascher (at) dlr.deUNSPECIFIED
Linder, Marcmarc.linder (at) dlr.deUNSPECIFIED
Date:18 May 2017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:thermochemical energy storage; heat transformation; salt hydrates; chemical heat pump.
Event Title:12th IEA Heat Pump Conference 2017
Event Location:Rotterdam, Niederlande
Event Type:international Conference
Event Dates:14.-18. Mai 2017
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)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Stengler, Jana
Deposited On:28 Jun 2017 08:19
Last Modified:28 Jun 2017 08:19

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