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Hydration performance and cycling stability of three TCM : MgSO 4 , ZnSO 4 and FeSO 4
Author(s) -
Rehman Ata Ur,
Maosheng Zheng,
Hayat Asif
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.5470
Subject(s) - enthalpy , sorption , relative humidity , dehydration , chemistry , humidity , standard enthalpy change of formation , zinc , thermodynamics , physics , organic chemistry , adsorption , biochemistry
Summary Thermochemical heat storage materials offer high‐energy storage densities and clean means of long‐term solar energy storage. The aim of the study is to assess the potential heat storage efficiency of salt hydrates, based on sufficient hydration/dehydration performance, water sorption and cyclicability. MgSO 4 7H 2 O, ZnSO 4 7H 2 O and FeSO 4 7H 2 O were evaluated based on preselected criteria. The main highlights of the dehydration result show that higher enthalpy was obtained for MgSO 4 and ZnSO 4 , shows 2256 and 1731 J g −1 enthalpy, respectively. During hydration process, six water molecules were absorb by MgSO 4 and ZnSO 4 after pre‐dehydrated temperature 150°C and 120°C, respectively. The cycle stability of MgSO 4 and ZnSO 4 showed better performance which give rise 1210 g −1 and 1155 J g −1 enthalpy, respectively. It was expected that FeSO 4 would show higher cyclicability due to their higher enthalpy (1400 J g −1 ) in the first round; however, overhydration does not permit it to released larger energy. The impact of relative humidity on water sorption performance and rate of hydration were reported which showed that MgSO 4 and ZnSO 4 can uptake maximum water under 85% and 75% relative humidity. Ongoing studies and the booming progress of ZnSO 4 7H 2 O illustrate that likewise MgSO 4 7H 2 O, it is also the potential candidate and can be use in thermochemical heat storage devices. To bring zinc sulfate heptahydrate into market, more detail studies in fields of evaluation of advanced materials and development of efficient and compact prototypes are still required.