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Experimental screening of salt hydrates for thermochemical energy storage for building heating application

Journal Article · · Journal of Energy Storage
 [1];  [1];  [2];  [3];  [2];  [4];  [1]
  1. Univ. of Auckland (New Zealand)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Univ. of Illinois, Chicago, IL (United States)
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 degrees 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 degrees C and 20, 30, 40, 60 and 80% RH, while dehydration is investigated under the conditions of 70, 100 and 140 degrees C using an oven. These dehydration temperatures of <100 degrees C are suitable for solar application whereas the dehydration temperature of 140 degrees C is suitable for waste heat. Furthermore, the salts are cycled over 30 times under the hydration conditions of 20 degrees C, 60% RH with a dehydration temperature of 100 degrees 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.
Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office (EE-5B)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1862952
Report Number(s):
NREL/JA-5500-81436; MainId:82209; UUID:0045085b-f80a-4a72-8893-3ec99e9c111e; MainAdminID:64281
Journal Information:
Journal of Energy Storage, Journal Name: Journal of Energy Storage Vol. 51; ISSN 2352-152X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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