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Energies 2018, 11(12), 3421; https://doi.org/10.3390/en11123421

Closed Adsorption Heat Storage—A Life Cycle Assessment on Material and Component Levels

1
Fraunhofer ISE Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, Germany
2
Institute for Acoustics and Building Physics, University of Stuttgart, 70569 Stuttgart, Germany
*
Author to whom correspondence should be addressed.
Received: 14 November 2018 / Revised: 28 November 2018 / Accepted: 3 December 2018 / Published: 6 December 2018
(This article belongs to the Section Energy Storage and Application)
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Abstract

Closed adsorption storages have been investigated in several projects for heat storage in building applications with focus on energy density and performance. This study complements this research with the assessment of the environmental impacts over the life cycle. Global warming potential (GWP) was chosen as the assessment criterion. Selected sorption materials in combination with water as the refrigerant were analyzed first by themselves and then embedded in a generic storage configuration. Sensible storage in water served as the reference benchmark. Results on material and component level showed that the relative storage capacity compared to water under realistic operating conditions reached values of below 4 and 2.5, respectively, in the best cases. Since the effort for producing the sorbents as well as the auxiliary material demand for assembling storage components was significantly higher than in the reference case, the specific environmental impact per storage capacity also turned out to be ~2.5 to ~100 times higher. We therefore suggest focusing sorption storage research on applications that (a) maximize the utilization of the uptake of sorbents, (b) do not compete with water storages, and (c) require minimal auxiliary parts. View Full-Text
Keywords: thermochemical storage; sorption storage; adsorption; storage capacity; life cycle assessment; embedded energy; global warming potential thermochemical storage; sorption storage; adsorption; storage capacity; life cycle assessment; embedded energy; global warming potential
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Nienborg, B.; Helling, T.; Fröhlich, D.; Horn, R.; Munz, G.; Schossig, P. Closed Adsorption Heat Storage—A Life Cycle Assessment on Material and Component Levels. Energies 2018, 11, 3421.

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