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Investigation of Novel Composite Materials for Thermochemical Heat Storage Systems

Author

Listed:
  • Salih Cem Akcaoglu

    (Department of Chemistry, University of Otago, Dunedin 9016, New Zealand)

  • Zhifa Sun

    (Department of Physics, University of Otago, Dunedin 9016, New Zealand)

  • Stephen Carl Moratti

    (Department of Chemistry, University of Otago, Dunedin 9016, New Zealand)

  • Georgios Martinopoulos

    (School of Science and Technology, International Hellenic University, 57001 Thessaloniki, Greece)

Abstract

Increasing energy prices make space heating more expensive every year in The Organisation for Economic Co-operation and Development (OECD) member countries. Thermochemical heat storage systems (THSS) can be used to reduce residential energy consumption for space heating and to control humidity. Utilizing compressed thermochemical pellets as heat storage materials is a way to increase volumetric energy storage capacity and to improve the performance of the THSS. In this work, expanded natural graphite (ENG), activated carbon (AC), strontium bromide, and magnesium sulphate were mixed in different mass ratios and compressed under applied pressures in a range of 0.77 to 5.2 kN⋅mm −2 to form composite pellets with a diameter of 12 and 25 mm, respectively, and a thickness from 1.5 to 25 mm. These pellets were characterized using thermogravimetric analysis and differential scanning calorimetry. Cyclic tests of hydration at 20 °C and dehydration at 85 °C were conducted to investigate changes in the surface morphology and the heat and mass transfer characteristics of the composite pellets. The permeability and thermal conductivity of the composite pellets were also measured. It was found that the structural stability of the pellets was enhanced by increasing the compression pressure. Utilizing AC and ENG in the composite mixture enhanced the porosity, thermal conductivity, and the permeability of the pellets.

Suggested Citation

  • Salih Cem Akcaoglu & Zhifa Sun & Stephen Carl Moratti & Georgios Martinopoulos, 2020. "Investigation of Novel Composite Materials for Thermochemical Heat Storage Systems," Energies, MDPI, vol. 13(5), pages 1-31, February.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:5:p:1042-:d:325440
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    References listed on IDEAS

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    1. Mukherjee, Ankit & Pujari, Ankush Shankar & Shinde, Shraddha Nitin & Kashyap, Uddip & Kumar, Lalit & Subramaniam, Chandramouli & Saha, Sandip K., 2022. "Performance assessment of open thermochemical energy storage system for seasonal space heating in highly humid environment," Renewable Energy, Elsevier, vol. 201(P1), pages 204-223.
    2. Bruno Rafael de Almeida Moreira & Ronaldo da Silva Viana & Victor Hugo Cruz & Paulo Renato Matos Lopes & Celso Tadao Miasaki & Anderson Chagas Magalhães & Paulo Alexandre Monteiro de Figueiredo & Luca, 2020. "Anti-Thermal Shock Binding of Liquid-State Food Waste to Non-Wood Pellets," Energies, MDPI, vol. 13(12), pages 1-26, June.

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