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Preparation and thermal properties of some mixtures of fatty acids and liquid paraffin as PCMs used for energy-storing wallboard

Mixtures of liquid paraffin and stearic acid, myristic acid, lauric acid and palmitic acid were prepared and investigated. The thermal properties of several mixtures were studied experimentally by a differential scanning calorimeter. The experimental results show that the phase-change temperatures and the phase-change latent heats of mixtures decrease with the increasing mass content of liquid paraffin. The phase-change temperatures of mixtures of liquid paraffin and palmitic acid, myristic acid and stearic acid are more than 30 °C, so they are not suitable for wallboard. When the mass contents of liquid paraffin are 60–80%, the phase-change temperatures of the mixture of liquid paraffin and lauric acid are 20.7–28.6 °C and the phase-change latent heats are 35–90 J/g. So mixtures of liquid paraffin and lauric acid are suitable phase-change materials (PCMs) used for wallboard. The results in this paper can provide references and a basis for the application of PCMs in wallboard.