Phase change materials(PCM) can be applied in mass concrete to prevent thermal cracks. Temperature distribution was measured in center area of normal concrete and paraffin PCM concrete. Thermal conductivity of PCM mortar was measured in air dry and oven dry condition. Thermal properties of pure paraffin and PCM mortar with different paraffin content were also tested with differential scanning calorimetry(DSC). The results show that phase change concrete with paraffin can slow down both temperature increasing rate and temperature dropping rate; PCM mortar has much higher thermal conductivity than pure paraffin and slightly lower than ordinary mortar. PCM mortar has similar latent heat and phase change temperature range to those of pure paraffin.
[1]CABEZA L F,CASTELL A,BARRENECHE C,et al.Materials used as PCM in thermal energy storage in buildings:A review[J].Renewable and Sustainable Energy Reviews,2011,15(3):1675 1695.
[2]EHID R,FLEISCHER A S.Development and characterization of paraffin based shape stabilized energy storage materials[J].Energy Conversion and Management,2012,53(3):84 91.
[3]ARCE P,CASTELLN C,CASTELL A,et al.Use of microencapsulated PCM in buildings and the effect of adding awnings[J].Energy and Buildings,2012,44(7):88 93.
SHI Wei,HOU Jing peng,ZHANG Xiong.Properties of mass concrete with paraffin phase change material[J].Journal of Building Materials,2010,13(3):414 417.(in Chinese)
ZHANG Dong.Experimental study on thermal conductivity of organic phase change composites[J].Journal of Building Materials,2008,11(1):42 46.(in Chinese)
[6]GRIFFITHS P W,EAMES P C.Performance of chilled ceiling panels using phase change material slurries as the heat transport medium[J].Applied Thermal Engineering,2007,27(10):1756 1760.
[7]FISCHER U R.Thermal conductivity and heat capacity measurements of paraffin embedded in a porous matrix[C]∥Thermal Conductivity 28/Thermal Expansion.New Brunswick:DEStech Publications,2006:517 523.