Fabrication and comprehensive analysis of expanded perlite impregnated with myristic acid-based phase change materials as composite materials for building thermal management

Abstract

Different climates have different thermal performance requirements for composite phase change material (CPCM). In this work, two low thermal conductivity CPCMs for tropical climate characteristics, myristic-lauric acid/expanded perlite (M-L/EP) and myristic acid-paraffin wax /expanded perlite (M-P/EP), were fabricated using lauric acid (LA), myristic acid (MA), paraffin wax (PW), and expanded perlite (EP) as raw materials. Of these, the myristic-lauric acid eutectic (M-L) synthesized from MA and LA and myristic acid- paraffin wax eutectic (M-P) synthesized from MA and PW were used as phase change materials (PCMs), and EP was used as the support material. The adsorption effect of EP on M-L and M-P was evaluated by leakage experiments. The maximum mass fraction of M-L is 75 %, while the maximum mass fraction of M-P is 65 %. At this point, the latent heats of M-L/EP and M-P/EP are 115.63 J·g−1 and 106.84 J·g−1, respectively. Additionally, both M-L/EP and M-P/EP have good thermal stability and reliability, but M-P/EP performs better in terms of economy.