Study on stability of carbon residue/Sodium acetate trihydrate composite phase change material from sludge pyrolysis

Abstract

Abstract In this paper, the pyrolysis carbon residue of sludge adsorbed sodium acetate trihydrate(SAT) of different quality to prepare composite phase change materials(CPCM). The thermal cycling performance of the prepared CPCM was tested to determine the optimal adsorption ratio of pyrolytic carbon residue to SAT. Multiple melt-solidification experiments were performed on pure SAT and CPCM to determine the improvement effect of pyrolytic carbon residue on SAT undercooling and phase separation phenomenon. The results show that the optimal adsorption ratio of pyrolytic carbon to SAT is 1:5, the undercooling degree of the CPCM is only -2.4, and the latent heat of phase change is 216.7kJ/kg, which basically overcomes the undercooling degree and phase separation phenomenon of sodium acetate trihydrate. The composite phase change material still has high latent heat value and excellent heat storage capacity after many cycles.