Thermodynamic analysis of chemical heat pumps

Jonas Obermeier, Karsten Müller and Wolfgang Arlt

Energy, 2015, vol. 88, issue C, 489-496

Abstract: Thermal energy storages and heat pump units represent an important part of high efficient renewable energy systems. By using thermally driven, reversible chemical reactions a combination of thermal energy storage and heat pump can be realized. The influences of thermophysical properties of the involved components on the efficiency of a heat pump cycle is analysed and the relevance of the thermodynamic driving force is worked out. In general, the behaviour of energetic and exergetic efficiency is contrary. In a real cycle, higher enthalpies of reaction decrease the energetic efficiency but increase the exergetic efficiency. Higher enthalpies of reaction allow for lower offsets from equilibrium state for a default thermodynamic driving force of the reaction.

Keywords: Chemical heat pump; Thermochemical heat storage; Exergy analysis; Reaction equilibrium; Thermodynamic driving force (search for similar items in EconPapers)
Date: 2015
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Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:88:y:2015:i:c:p:489-496

DOI: 10.1016/j.energy.2015.05.076

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