Доступ предоставлен для: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Performance Analysis of the Molten-Salt Thermal Storage System Filled by PCM Capsules with Cascaded Melting Temperatures

Get access (open in a dialog) DOI: 10.1615/IHTC15.tst.008753
pages 9117-9130

Аннотация

We present a transient, one-dimensional dispersion-concentric (D-C) model to numerically study the charging and discharging behaviors of the molten-salt thermal energy storage system filled by PCM capsules with cascaded phase change temperatures (PCTs). Three different storage systems including the non-cascaded system, the cascaded system with 3 PCTs and the cascaded system with 5 PCTs are investigated. Detailed characteristics of heat transfer between molten salt and the packed PCM capsules are revealed, and various numerical results are examined, including the temperature distributions of molten salt and PCM capsules, the variations in the molten-salt outlet temperature, the accumulated charging and discharging ratios, etc. The results show that for cascaded systems, some stored latent heat in PCM capsules with relatively lower PCTs may not be effectively used. On the other hand, the non-cascaded system could suffer from low accumulated charging ratio and much longer charging time due to the constrains of PCT. The cascaded systems especially with 5 cascaded PCTs are found to have both a fast discharging rate and a fast charging rate, and thus cascaded systems are very promising to be used as the compact high-temperature TES system using liquid as the heat transfer fluid.