TY - JOUR
T1 - Thermophysical Property Measurements of Tetrabutylphosphonium Oxalate (TBPOx) Ionic Semiclathrate Hydrate as a Media for the Thermal Energy Storage System
AU - Miyamoto, Takashi
AU - Koyama, Ryo
AU - Kurokawa, Naruki
AU - Hotta, Atsushi
AU - Alavi, Saman
AU - Ohmura, Ryo
N1 - Funding Information:
The authors gratefully acknowledge the Ohmura Lab members for valuable discussion and support. Funding. This study was supported by JKA Foundation (Grant No. 2018M-170) and JSPS KAKENHI (Grant No. 17H03122).
Publisher Copyright:
© Copyright © 2020 Miyamoto, Koyama, Kurokawa, Hotta, Alavi and Ohmura.
PY - 2020/7/16
Y1 - 2020/7/16
N2 - With increasing global power demand, thermal energy storage technology could play a role ensuring a sustainable energy supply in power generation from renewable energy sources and power demand concentration. Hydrates have high potential as phase change materials (PCMs) for the use as a thermal energy storage medium. To develop thermal energy storage technology using a hydrate-based material, further investigation of thermophysical properties and the selection of a suitable hydrate are required. Tetrabutylphosphonium oxalate (TBPOx) ionic semiclathrate hydrate contains oxalic acid in salt form, as a guest compound, which is classified as carboxylic acid group with low environmental impact. In the present study, the phase equilibrium temperature and the dissociation heat of TBPOx hydrate were measured. The highest equilibrium temperature of the solid hydrate formed was 9.4°C at the mass fraction 0.35 of TBPOx in aqueous solution. The largest dissociation heat was 186.0 ± 0.5 kJ·kg−1 at the mass fraction of 0.35. Comparing with other PCMs with close phase equilibrium temperatures, TBPOx hydrate is superior in safety and sustainability. These results indicate that TBPOx hydrate would be suitable as the thermal storage medium for the general air conditioning systems.
AB - With increasing global power demand, thermal energy storage technology could play a role ensuring a sustainable energy supply in power generation from renewable energy sources and power demand concentration. Hydrates have high potential as phase change materials (PCMs) for the use as a thermal energy storage medium. To develop thermal energy storage technology using a hydrate-based material, further investigation of thermophysical properties and the selection of a suitable hydrate are required. Tetrabutylphosphonium oxalate (TBPOx) ionic semiclathrate hydrate contains oxalic acid in salt form, as a guest compound, which is classified as carboxylic acid group with low environmental impact. In the present study, the phase equilibrium temperature and the dissociation heat of TBPOx hydrate were measured. The highest equilibrium temperature of the solid hydrate formed was 9.4°C at the mass fraction 0.35 of TBPOx in aqueous solution. The largest dissociation heat was 186.0 ± 0.5 kJ·kg−1 at the mass fraction of 0.35. Comparing with other PCMs with close phase equilibrium temperatures, TBPOx hydrate is superior in safety and sustainability. These results indicate that TBPOx hydrate would be suitable as the thermal storage medium for the general air conditioning systems.
KW - carboxylic acid
KW - dissociation heat
KW - ionic semiclathrate hydrate
KW - phase change material (PCM)
KW - phase equilibrium temperature
KW - tetrabutylphosphonium oxalate (TBPOx)
KW - thermal energy storage medium
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U2 - 10.3389/fchem.2020.00547
DO - 10.3389/fchem.2020.00547
M3 - Article
AN - SCOPUS:85088798814
VL - 8
JO - Frontiers in Chemistry
JF - Frontiers in Chemistry
SN - 2296-2646
M1 - 547
ER -