Nomenclature
A	Area (m2)	Subscripts
cp	Specific heat at constant pressure (kJ/kg K)	amb	Ambient
E	Energy (kJ)	H2O	Water
∆h	Heat storage specific capacity (kJ/kg)	i	Layer number
m	Mass (kg)	liq	Liquid
to	Initial time (s)	sol	Solid
t	Time (s)
T	Temperature (°C)	Greek symbols
U	Overall heat transfer coefficient (kW m2/°C)	α	Fraction of PCM material in the liquid state