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Rubitherm RT 27 is a paraffin-based phase-change material (PCM) in which achange between a solid and liquid phase is used to store/release thermalenergy. Its enthalpy and heat capacity, as measured in a quasistatic regime byadiabatic scanning calorimetry, has a single distinct jump and peak,respectively, at about 27.3 C. We present a microscopic development from whichthe jump and peak can be accurately fitted and that could be analogouslyapplied even to other PCMs. It enables us to determine the baseline and excesspart of the heat capacity and thus the latent heat associated with the phasechange. It is shown to be about 84 % of the total enthalpy change that occurswithin 5 C from the peak maximum position. The development is based on theobservation that PCMs often have polycrystalline structure, being composed ofmany single-crystalline grains. The enthalpy and heat capacity measured inexperiments are therefore interpreted as superpositions of many contributionsthat come from the individual grains.

Modeling of a heat capacity peak and an enthalpy jump for a paraffin-based phase-change material