This research is based on the following papers, referred to by Roman numerals I - III. I. G.Selka et al " Numerical study of thermal behaviour of building walls containing a phase change material" Mechanika 2014 Vol 20 N°4. II. G.selka et al " Dynamic thermal behaviour of building using PCMs for latent heat storage. Thermal Science, 2014. III. Selka.G et al "Thermal analysis of habitat using phase change materials for insulation" jith2013 Maroc.