Preparation and characterization of a capric acid-stearic acid-ceramsite-concrete composite phase change material

doi:10.12028/j.issn.2095-4239.2016.0078

Abstract

Abstract: A vacuum adsorption method was used to make ceramsite particles to absorb capric acid-stearic acid based phase change materials (PCMs).These, upon subsequent surface sealing with silica sol, gave shape-stable encapsulated PCM particles. These encapsulated particles were then used as aggregates in cement formulation to obtain composite PCM concrete. The composite PCM concrete was characterized for their thermal and mechanical properties. The thermal storage performance of the composite PCM concrete was studied though contrast experiments in a model room. The results indicate that the composite PCM concrete has a good thermal stability demonstrated through 600 thermal cycles. At a load of 60% (by mass) composite PCM particles in the aggregates, the compressive strength and flexural strength of the concrete is increased respectively by 22.3% and 13.2% after 600 thermal cycles. The model room contrast experiments showed that the centre and interior average temperatures of the model house are 5 ℃ and 6 ℃ lower than that of the ordinary model room, with the phase change process lasting approximately 25 minutes. Analyses suggest when a concrete wall of 202 mm thickness is mixed with 4.20 kg/m2 PCM composite particles, it could achieve the same thermal insulation effect as a 282 mm thickness wall, illustrating the substantial enhancement of thermal storage capacity of the wall through the use of PCM.

Key words: phase change materials, silica sol, phase change ceramsite(PCCs), thermal storage concrete

ZHU Jiaoqun, LI Jialong, ZHOU Weibing, LI Ruguang. Preparation and characterization of a capric acid-stearic acid-ceramsite-concrete composite phase change material[J]. Energy Storage Science and Technology, 2017, 6(2): 255-262.

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