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Annual Review of Heat Transfer, Vol. 15, p.131-177 https://doi.org/10.1615/AnnualRevHeatTransfer.2012004651 Table 7: Properties of selected inorganic phase change materials (PCMs) for latent heat storage. PCMs H2O KF∙4H2O CaCl2∙6H2O Na2SO4∙10H2O Na2HPO4∙12H2O Na(CH3COO)∙3H2O Na Zn 419 Al 660 T Δhm λs λl Cp,s Cp,l ρl ∆V/Vs [°C] [J/g] [W/mK] [W/mK] [J/gK] [J/gK] [g/cm3] [%] 0 19 30 32 35 58 Ice and salt hydrates 334 2.3 0.56 230 n.a. n.a. 180 1.1 0.5 250 0.5 n.a. 2.10 4.22 1.8 2.4 1.4 2.1-2.3 1.9 3.3 1.5-1.7 2.0-3.2 2.1 3.0 1.36 1.38 0.45 0.48 1.18 1.18 280 0.5 250 0.7 Pure metals 113 122 112 100 1.00 -8.3 1.46 n.a. 1.56 13 1.41 4 1.44 5 1.28 13 0.93 2.8 6.76 1.9 2.38 7.5 1.9 14 1.98 4 1.9 13 1.95 5 1.78 22 1.81 17 1.91 11 2.13 16 n.a. 1,0 1,0 1.8 n.a. n.a. 1.7 1.6 1.90 17 n.a. 1.3-1.8 1.8-2.3 1.96 10 98 0.5 0.4 87 50 91 397 211 Anhydrous salts and their mixtures (Composition in weight%) KNO3-LiNO3 (67-33) KNO3-NaNO2-NaNO3 (53-40-7) LiNO3-NaNO3 (49-51) KNO3-NaNO3 (54-46) LiNO3 NaNO2 NaNO3 NaOH KNO3 NaCl-KCl-MgCl2 (24.5-20.5-55) K2CO3-Li2CO3-Na2CO3 (35-32-33) K2CO3-Li2CO3 (65-35) 3.1.1. Paraffins 133 170 n.a. n.a. n.a. n.a. 142 80 0.5 0.5 1.3 1.6 194 265 n.a. 0.5 n.a. n.a. 222 100 n.a. 0.5 1.4 1.5 254 360 1.4 0.6 1.8 1.6-2.0 270 180 0.7-1.3 0.5-0.7 n.a. 1.6-1.8 306 175 0.6 322 210 0.9 337 100 n.a. 393 240 1,0 397 275 n.a. 505 345 n.a. 0.51 0.8 0.4-0.5 1.66 1.66 2.0 2.1 1.4 1.3-1.4 1.87-1.89 3 Paraffins are waxy solids at room temperature. Their melting points and heat of fusion increase with molar mass. Compounds in the series C14H30 – C40H82 have melting points in the range 6 – 80 oC. They are advantageous storage materials for the following reasons: They are widely available and inexpensive Noncorrosive and nontoxic Chemically stable, with a low density Phase transformation is rapid Supercooling is negligible But they show the following drawbacks: Low volumetric energy density (compared to salt hydrates) Change in volume during melting by about 10 % Low thermal conductivity and diffusivityPDF Image | Annual Review of Heat Transfer
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