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@ARTICLE{Bayon:858368,
      author       = {Bayon, Alicia and Liu, Ming and Sergeev, Dmitry and
                      Grigore, Mihaela and Bruno, Frank and Müller, Michael},
      title        = {{N}ovel {S}olid–{S}olid {P}hase-{C}hange{C}cascade
                      {S}ystems for {H}igh-temperature {T}hermal {E}nergy
                      {S}torage},
      journal      = {Solar energy},
      volume       = {177},
      issn         = {0038-092X},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2018-07254},
      pages        = {274 - 283},
      year         = {2019},
      abstract     = {In this work, we investigate novel solid–solid
                      phase-change cascade systems based on mixtures of lithium
                      and sodium sulfates. Solid–solid phase-change materials
                      (PCMs) can be coupled with concentrated solar power
                      technologies. They present several advantages over
                      solid–liquid PCMs including lower thermal expansion, lower
                      or no corrosiveness, and no need for encapsulation. In
                      solid–solid PCMs, the energy is stored during crystal
                      structure transitions. Specifically, lithium sulfate
                      undergoes a crystal structure transition (monoclinic to
                      cubic) at 576 °C, which is a suitable temperature for
                      concentrated solar thermal technologies. Due to the high
                      cost of lithium sulfate, we evaluated the potential of
                      mixing lithium with sodium sulfate to create solid–solid
                      cascaded PCM systems to provide higher thermal storage
                      densities. We used differential scanning calorimetry,
                      high-temperature in situ X-ray diffraction and
                      thermogravimetric analysis to evaluate the phase-transition
                      temperature, phase-change enthalpy, specific heat capacity,
                      crystalline phase composition and thermal expansion. The
                      obtained values for heat capacity and enthalpies of phase
                      transitions showed good agreement with available
                      thermodynamic databases. Therefore, further calculations of
                      thermodynamic properties of each mixture in the system were
                      performed for designing cascaded latent thermal energy
                      storage system. From the PCM mixtures studied, NaLiSO4 shows
                      the greatest stability under ambient conditions. A mixture
                      of $59.17\%$ NaLiSO4 and $40.83\%$ Li2SO4 allows an optimum
                      charge of both PCMs for power cycles such as supercritical
                      CO2. Economic assessment revealed that this cascade system
                      has an estimated cost of $50.2 kWhth−1.},
      cin          = {IEK-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-2-20101013},
      pnm          = {111 - Efficient and Flexible Power Plants (POF3-111)},
      pid          = {G:(DE-HGF)POF3-111},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000456222500024},
      doi          = {10.1016/j.solener.2018.10.085},
      url          = {https://juser.fz-juelich.de/record/858368},
}