Keywords : Thermal energy storage

Water vapor adsorption in silica gel for thermal energy storage application

Ye Hua; Amanda Godin; F. Handan Tezel

Advanced Materials Letters, 2019, Volume 10, Issue 2, Pages 124-127
DOI: 10.5185/amlett.2019.2181

Thermal energy storage (TES) by water vapor adsorption process has attracted increasing interest for its thermal applications such as space heating and cooling. However, the experimental energy density of the adsorbents may vary as the operating system and conditions change, which could be much lower than the theoretical energy density. In this manuscript, an experimental system has been designed and built to examine the effects of the regeneration temperature and relative humidity (RH) on a commercial silica gel material’s performance as adsorption TES material. The experimental energy density under different operating conditions were calculated. Up to 25 adsorption-desorption cycles were performed to examine the stability of the material and the repeatability of the results. 

Performance Evaluation Of Solar Cooker Using Some [N+4444] Based Ionic Liquids As Thermal Energy Storage Materials

Vasishta D. Bhatt;Kuldip Gohil

Advanced Materials Letters, 2013, Volume 4, Issue 4, Pages 277-282
DOI: 10.5185/amlett.2012.9420

Seven ionic liquids (ILs) based on tetrabutylammonium cation [N+4444] and inorganic anions were tested for their applications in a solar cooker. Thermophysical characteristics like melting point, density, heat of fusion, heat of solid - solid transitions, specific heat capacity and thermal conductivity were used to determine the efficiency of ILs used as phase change materials (PCMs) in solar thermal applications. A delay time of two hours was observed on an average in achieving the highest temperatures. A majority of the ILs extended the time required for achieving ambient temperature to a tune of around four hours. The ILs containing bromide, iodate and nitrate proved to be more efficient than the thiocyanate, bromate and hexafluorophosphate moieties.