Journal
APPLIED THERMAL ENGINEERING
Volume 70, Issue 1, Pages 316-320Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2014.05.020
Keywords
Thermal energy storage; Phase change material; Packed bed; Latent heat; Sensible heat; Concentrated solar power
Funding
- Swiss Federal Office of Energy
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A new thermal energy storage (TES) configuration for concentrated solar thermal power is proposed for stabilizing the outflow temperature of a packed bed of rocks during discharging. This concept is based on the combination of sensible and latent heat storage by adding a relatively small amount of phase change material (PCM) to the top of the bed. Transient simulations solving the energy conservation equations for fluid, solid, and molten phases show that the outflow temperature during discharging can be kept constant around the PCM melting temperature, thereby eliminating the inherent temperature drop of TES based on sensible heat storage only. A PCM volume of only 1.33% of the total storage volume is sufficient to accomplish stabilization, corresponding to 4.4% of the total thermal energy stored as latent heat. (C) 2014 Elsevier Ltd. All rights reserved.
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