SPCMS	Solar PCM system
PCM	Phase change material
TES	Thermal energy storage
HVAC	Heating, ventilation, and air-conditioning
PTTS	Passive thermal storage system
DP-SAH	Double-pass solar air heater
CPV	Concentrated photovoltaic
HTF	Heat transfer fluid
DHW	Domestic hot water
$S_i$	Source term
$\rho$	Density (kgm−3)
$\beta$	Thermal expansion coefficient (K−1)
T	Temperature (K)
k	Thermal conductivity (Wm−1 K −1)
h	Enthalpy (Jkg−1)
Cp	Specific heat (Jkg−1K−1)
$L_f$	Latent heat of fusion (kJkg−1)
$S_{Mi}$	Source term for momentum
t	Time (min, second)