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Paper title: thermochemical heat storage behavior of ZnSO4.7H2O under low-temperature

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Abstract

Thermochemical heat storage materials for space heating applications such as, ZnSO4 offer high energy storage density, low cost and clean mean of long-term solar energy storage. Herein, we studied the ZnSO4 hydrated salt as potential heat storage material at low temperature and furthermore observed the impact of temperature and concentration on the dehydration/hydration process and enthalpy. The thermal behavior of ZnSO4•7H2O was investigated by applying various dehydration temperatures. The results showed that 85% of water loosed at 100 °C temperature, which released 699 J/g (1.37 GJ/m3) in the dehydration process. The hydration process of ZnSO4.7H2O at 100 °C recovered 541 J/g enthalpies, which delivered 1.1 GJ/m3. Similarly, the dehydration result obtained at 150 °C was the same as showed at 100 °C. However, the enthalpy of hydration was 20% less than prior. The XRD result showed that at higher temperatures agglomeration appeared followed by Van der Waals forces which affect the hydration rate. The result of good cyclability and larger water sorption performance of ZnSO4 make them a promising and suitable for heat storage in space heating application, which can be used as thermochemical heat storage material for thermal storage devices.

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Acknowledgments

Financial support from NSFC (51672208), National Key R&D Program of China (2018YFB1502902), Key Program for International S&T Cooperation Projects of Shaanxi Province (2019KWZ-03), and Sci-Tech R&D Program of Shaanxi Province (2010 K01-120, 2011JM6010 and 2015JM5183) is greatly acknowledged. The project was partly sponsored by SRF ((2012)940) for ROCS, SEM.

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Authors and Affiliations

  1. Institute for Energy Transmission Technology and Application, School of Chemical Engineering, Northwest University, Xi’an, Shaanxi, People’s Republic of China

    Ata Ur Rehman, Zheng Maosheng & Ahsen Riaz Khan

  2. Department of Chemistry, Bacha Khan University, Charsadda, Pakistan

    Ata Ur Rehman

  3. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, Shaanxi, People’s Republic of China

    Muhammad Khan

  4. Department of Chemistry, University of Okara, Renala Khurd, Okara, Punjab, Pakistan

    Muhammad Khan

  5. College of Chemistry, Fuzhou University, Fuzhou, People’s Republic of China

    Asif Hayat

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  1. Ata Ur Rehman
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  2. Muhammad Khan
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  3. Zheng Maosheng
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Correspondence to Ata Ur Rehman or Muhammad Khan.

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Rehman, A.U., Khan, M., Maosheng, Z. et al. Paper title: thermochemical heat storage behavior of ZnSO4.7H2O under low-temperature. Heat Mass Transfer 57, 765–775 (2021). https://doi.org/10.1007/s00231-020-02990-y

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  • DOI: https://doi.org/10.1007/s00231-020-02990-y

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