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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

THERMAL CONDUCTIVITY ENHANCEMENT OF MATERIAL FOR CALCIUM CHLORIDE/WATER THERMOCHEMICAL ENERGY STORAGE

Get access (open in a dialog) DOI: 10.1615/IHTC16.nee.023351
pages 7495-7502

Sinopsis

In this study, Calcium chloride (CaCl2) particle composite material (ECL) mixed with expanded graphite (EG) was developed for enhancement of its thermal conductivity and cyclic durability. The reactivity of the ECL was measured by thermal gravimetric analysis. Mixing with EG increased the hydration rate of CaCl2. Also, the optimum weight ratio of CaCl2/EG was 6.0. In order to improve the thermal storage density, the ECL was compressed in tablet figure. As a result, it was confirmed that the hydration rate decreased as the weight density increased. However, when the weight density becomes 2 or 3 times, the hydration rate was not reached 1/2 or 1/3, so compression in tablet figure was an excellent means for improving the thermal storage density. The hydration performance of the develop ECL and its durability were evaluated by a packed bed reactor scaled up under thermal gravimetric analysis. The reactivity of ECL was improved by raising the reaction water vapor pressure. In addition, a linear relationship was confirmed between the reaction water vapor pressure and the maximum hydration rate. The durability for repetition 10 cycle operation was confirmed. It was measured that the maximum hydration heat output rate in the 2nd cycle was 1.88 kW/L-material, and the maximum hydration output rate in the 10th cycle was 1.36 kW/L-material. The results showed the potential of the thermochemical energy storage system.