TITLE:
Performance of Thermal Energy Storage Unit Using Solid Ammoniated Salt (CaCl2-NH3 System)
AUTHORS:
Yuki Sakamoto, Hideki Yamamoto
KEYWORDS:
Energy Storage Unit, Calcium Chloride (CaCl2), Ammonia (NH3), Ammoniated Salt, Ammoniation, Heat Transfer Media
JOURNAL NAME:
Natural Resources,
Vol.5 No.8,
June
19,
2014
ABSTRACT:
The exothermic chemical reaction of CaCl2 (calcium chloride) with
NH3 (ammonia) can be utilized as an energy storage system. Since this
reaction is a typical gas-solid reaction, the reaction rate is controlled by the
heat transfer rate. In order to improve the low heat transfer rate of the ammoniation
and the deammoniation of CaCl2, the influence of a heat transfer
media (Ti: titanium) on the
heat transfer rate of the solid ammoniated salt (CaCl2.mNH3)
was studied and tested experimentally. The performance tests were carried out
under the conditions of various weight ratios of Ti. No decrease of the activation of chemical reaction and no
corrosion of experimental apparatus were observed on the repeated runs (≥30
times each). The heat transfer rate of ammoniated salt was greatly improved by
adding Ti under the constant pressure (0.5
MPa). The reaction time required for the ammoniation of CaCl2 mixed with Ti was approximately 16% - 54%
shorter than that of CaCl2 alone, and the reaction time required
for the deammoniation was also approximately 19% - 59% shorter than that of CaCl2 alone.