Journal
ENERGY
Volume 88, Issue -, Pages 489-496Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2015.05.076
Keywords
Chemical heat pump; Thermochemical heat storage; Exergy analysis; Reaction equilibrium; Thermodynamic driving force
Categories
Funding
- state of Bavaria
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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. (C) 2015 Elsevier Ltd. All rights reserved.
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