Performance evaluation of a solar desalination-hot water system using heat pipe vacuum tube parabolic trough solar collector – An experimental study with Taguchi analysis

•A hybrid system for simultaneously producing hot water and drinking water.•Using parabolic-trough solar collector, concave mirror and vacuum tube heat pipe.•Taguchi-Based DOE to identify the effective parameters on the energy efficiency.•The most effective parameter on the energy efficiency are the water flow rate.•The costs of distilled and hot water were 0.0380 $/L and 1.01 $/m3, respectively.