Analysis of a Lab-Scale Heat Transformation Demonstrator Based on a Gas–Solid Reaction

Jana Stengler, Julius Weiss and Marc Linder
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Jana Stengler: German Aerospace Center (DLR), Institute of Engineering Thermodynamics, 70569 Stuttgart, Germany
Julius Weiss: German Aerospace Center (DLR), Institute of Engineering Thermodynamics, 70569 Stuttgart, Germany
Marc Linder: German Aerospace Center (DLR), Institute of Engineering Thermodynamics, 70569 Stuttgart, Germany

Energies, 2019, vol. 12, issue 12, 1-10

Abstract: Heat transformation based on reversible chemical reactions has gained significant interest due to the high achievable output temperatures. This specific type of chemical heat pump uses a reversible gas–solid reaction, with the back and forward reactions taking place at different temperatures: by running the exothermic discharge reaction at a higher temperature than the endothermic charge reaction, the released heat is thermally upgraded. In this work, we report on the experimental investigation of the hydration reaction of strontium bromide (SrBr 2 ) with regard to its use for heat transformation in the temperature range from 180 °C to 250 °C on a 1 kg scale. The reaction temperature is set by adjusting the pressure of the gaseous reactant. In previous experimental studies, we found the macroscopic and microscopic properties of the solid bulk phase to be subject to considerable changes due to the chemical reaction-. In order to better understand how this affects the thermal discharge performance of a thermochemical reactor, we combine our experimental work with a modelling approach. From the results of the presented studies, we derive design rules and operating parameters for a thermochemical storage module based on SrBr 2 .

Keywords: heat transformation; thermochemical reaction; chemical heat pump; thermal upgrade; gas–solid reaction (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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