ZP—Zeta potential	UV—ultraviolet
wt%—percent weight	PVP—polyvinylpyrrolidone
EG—ethylene glycol	SDBS—sodium dodecyl benzene sulfonate
DLS—dynamic light scattering	SDS—sodium dodecyl sulfate
PG—polyethene glycol	SLS—sodium lauryl sulfate
SHMP—sodium hexa meta phosphate	CTAB—centrimonium bromide
cp—specific heat capacity, kJ/kg K	DASC—direct absorption solar collector
DIW—deionized water	DW—distilled water
EC—extinction coefficient	EGR—entropy generation rate, W/K
EO—engine oil	f— friction factor
FLH—freezing latent heat, kJ/kg	FPSC—flat plate solar collector
FT or ST—freezing or solidification temperature, °C	h—heat transfer coefficient, W/m2 K
HNF—hybrid nanofluid	HNP—hybrid nanoparticles
MLH—melting latent heat, kJ/kg	MNF—mono nanofluid
MT—meting temperature, °C	NF—nanofluid
NP—nanoparticles	PCM—phase change materials
PEC—performance evaluation criteria	PTEC—photo-thermal energy conversion
PV/T—photovoltaic-thermal	SAR—specific absorption rate, W/μl
SWEA—solar weighted energy	W—water
Greek symbols
φ—volume or weight concentration or fraction	κ—thermal conductivity, W/m K
ρ—density, kg/m3	θc—contact angle, °
μ—viscosity, mPas