“…In order to improve its thermal conductivity, various methods have been explored. The most acknowledged method is to add particles with high thermal conductivity coefficients and incorporate porous structure materials such as expanded graphite (Dheep and Sreekumar, 2014;Wang et al, 2014;Meng et al, 2012;Zhang et al, 2013;Yang et al, 2014), expanded perlite Sari and Karaipekli, 2008), activated-attapulgiate (Song et al, 2014), carbon nanotubes (Dheep and Sreekumar, 2014;Meng et al, 2013;Wang et al, 2010Wang et al, , 2008Zeng et al, 2008), diatomite (Li et al, 2011a,b), and vermiculite Sari, 2009, 2010) into the PCMs. As for preventing the leakage of PCMs during the solid-liquid phase change, the form-stable composite PCMs containing silicon dioxide (Fang et al, 2010(Fang et al, , 2011, expanded graphite Meng et al, 2012;Zhang et al, 2013;Yang et al, 2014), expanded perlite Sari and Karaipekli, 2008), polymers including polyethylene terephthalate, polyamide 6, polyurethane, polyacrylonitrile and derived carbon (Cai et al, 2011(Cai et al, , 2012a(Cai et al, ,b, 2013aChen et al, 2008;Ke et al, 2013;Giro-Paloma et al, 2013;Zhang et al, 2012), activated-attapulgiate (Song et al, 2014), diatomite (Li et al, 2011a,b), and vermiculite Sari, 2009, 2010) as support materials have been investigated.…”