2024-03-29T09:14:19Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00025734
2023-01-16T04:15:43Z
320:321:322
Durability of thermochemical heat storage demonstrated through long-term repetitive CaCl2/H2O reversible reactions
Kuwata, Kazuki
Esaki, Takehiro
Yasuda, Michitaka
Matsuda, Takayuki
Kobayashi, Noriyuki
Shiren, Yohhei
Aman, Yasutomo
open access
Copyright 2017 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.The following article appeared in (Journal of Renewable and Sustainable Energy. v.9, n.2, 2017, p.024102) and may be found at (http://dx.doi.org/10.1063/1.4978351).
Thermochemical heat storage is a promising technology for improving thermal energy efficiency. In this study, CaCl2 and H2O were selected as the reactant and working medium, respectively, assuming the utilization of low-grade waste heat. To investigate the durability of the CaCl2/H2O reaction, 1000 repetitive operations were conducted at the same 110 °C charging and discharging temperatures. During the long-term repetitions, a decrease in the average volumetric power density was observed. The peak value in repetitions 901–1000 was 11% lower than the peak value in the initial 50 repetitions. This trend was mainly caused by a decrease in the heat transfer rate; it was observed after the repetitive experiments that reactant particles had moved out of the heat exchanger. Although a decreasing trend in the power density was observed, a peak value of Q = 320 kW/m^3 and a conversion ratio of approximately 0.7 were observed in repetitions 901–1000. In addition, approximately 90% of the stored heat was released in all 1000 repetitions. Thus, using long-term repetitions (1000), this study confirmed the durability of the CaCl2/H2O reaction for thermochemical heat storage.
AIP Publishing
2017-04-10
eng
journal article
VoR
http://hdl.handle.net/2237/00027941
https://nagoya.repo.nii.ac.jp/records/25734
https://doi.org/10.1063/1.4978351
1941-7012
Journal of Renewable and Sustainable Energy
9
2
024102
https://nagoya.repo.nii.ac.jp/record/25734/files/Durability_of_thermochemical_heat_storage.pdf
application/pdf
1.9 MB
2018-05-08