1/11/2018 · Shi et al. [32] evaluated the thermal conductivity of a novel form of stable fiber composite concrete that contains paraffin as PCM. The thermal conductivity of paraffin in solid phase is 0.27 W/m °K, but this value is 0.15 W/m °K in liquid phase. However, the thermal conductivity of paraffin in liquid phase is lower than solid phase.