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Table 2 Specific heat of NaNO 3 -KNO 3 (60:40) mixture and nanofluids obtained with different nanoparticles

From: Effect of nanoparticles on heat capacity of nanofluids based on molten salts as PCM for thermal energy storage

Material Nanoparticle concentration wt.% Specific heat (solid phase; kJ/kg·K) Enhancement (solid phase; %) Specific heat (liquid phase; kJ/kg·K) Enhancement (liquid phase; %)
Base salt mixture - 1.604 - 1.648 -
Base salt + SiO2 0.5 1.341 −16.4 1.329 −19.3
  1.0 1.843 14.9 1.661 0.8
  1.5 1.635 2.0 1.624 −1.4
Base salt + Al2O3 0.5 1.526 −4.8 1.522 −7.6
  1.0 1.923 19.9 1.745 5.9
  1.5 1.550 −3.3 1.590 −3.5
Base salt + TiO2 0.5 1.372 −14.4 1.390 −15.6
  1.0 1.508 −6.0 1.544 −6.3
  1.5 1.432 −10.7 1.454 −11.8
Base salt + SiO2-Al2O3 0.5 1.572 −2.0 1.525 −7.5
  1.0 2.529 57.7 2.018 22.5
  1.5 2.162 34.8 1.673 1.5