Na2HPO4 center dot 12H(2)OSiO2 hydrophilic modificationExpanded graphiteComposite phase change materialShape stabilityRadiant floor heating systemENERGY-STORAGESALTBased on Na 2 HPO 4 ·12H 2 O as phase change material (PCM) and SiO 2 hydrophilic modified expanded graphite (MEG) as supporting carrier...