TY - JOUR
T1 - Experimental Screening of Salt Hydrates for Thermochemical Energy Storage for Building Heating Application
AU - Clark, Ruby-Jean
AU - Gholamibozanjani, Gohar
AU - Woods, Jason
AU - Kaur, Sumanjeet
AU - Odukomaiya, Adewale
AU - Al-Hallaj, Said
AU - Farid, Mohammed
N1 - Publisher Copyright:
© 2022
PY - 2022
Y1 - 2022
N2 - The selection of a suitable salt hydrate for use in a thermochemical energy storage system is challenging. In this work, the most promising salts to store intermediate heat energy were selected and tested. The criteria set are; volumetric energy density of >500 kWh m−3 with a dehydration temperature of <100 °C, material cost of <3.5 USD kg−1 (<15 USD kWh−1), melting does not occur during dehydration and safety. Based on that, the salt hydrates SrCl2, MgSO4, Na3PO4, MgCl2 and SrBr2 were selected and tested experimentally. A constant temperature and humidity chamber was used to measure moisture sorption of different salts. The hydration is investigated under the conditions of 20 °C and 20, 30, 40, 60 and 80% RH, while dehydration is investigated under the conditions of 70, 100 and 140 °C using an oven. These dehydration temperatures of <100 °C are suitable for solar application whereas the dehydration temperature of 140 °C is suitable for waste heat. Furthermore, the salts are cycled over 30 times under the hydration conditions of 20 °C, 60% RH with a dehydration temperature of 100 °C. From these results, it is concluded that SrCl2 and SrBr2 are the most promising salts. This study outlines both the advantages and disadvantages of each salt and states the conditions they are most suitable for.
AB - The selection of a suitable salt hydrate for use in a thermochemical energy storage system is challenging. In this work, the most promising salts to store intermediate heat energy were selected and tested. The criteria set are; volumetric energy density of >500 kWh m−3 with a dehydration temperature of <100 °C, material cost of <3.5 USD kg−1 (<15 USD kWh−1), melting does not occur during dehydration and safety. Based on that, the salt hydrates SrCl2, MgSO4, Na3PO4, MgCl2 and SrBr2 were selected and tested experimentally. A constant temperature and humidity chamber was used to measure moisture sorption of different salts. The hydration is investigated under the conditions of 20 °C and 20, 30, 40, 60 and 80% RH, while dehydration is investigated under the conditions of 70, 100 and 140 °C using an oven. These dehydration temperatures of <100 °C are suitable for solar application whereas the dehydration temperature of 140 °C is suitable for waste heat. Furthermore, the salts are cycled over 30 times under the hydration conditions of 20 °C, 60% RH with a dehydration temperature of 100 °C. From these results, it is concluded that SrCl2 and SrBr2 are the most promising salts. This study outlines both the advantages and disadvantages of each salt and states the conditions they are most suitable for.
KW - Energy storage density
KW - Heat storage
KW - Material screening
KW - Salt hydrates
KW - Thermochemical energy storage
UR - http://www.scopus.com/inward/record.url?scp=85126691102&partnerID=8YFLogxK
U2 - 10.1016/j.est.2022.104415
DO - 10.1016/j.est.2022.104415
M3 - Article
AN - SCOPUS:85126691102
SN - 2352-152X
VL - 51
JO - Journal of Energy Storage
JF - Journal of Energy Storage
M1 - 104415
ER -