Numerical Study of Coaxial Evacuated Tube Collector with Nano-fluid

Abstract

In this paper, a numerical model of a coaxial evacuated tube solar collector was presented. Due to the coaxial arrangement, a nonlinear temperature profile was obtained in which the peak temperature is not always at the outlet. Nano-fluid, a promising new material with enhanced heat transfer properties, is employed as working fluid. For this purpose alumina–water nano-fluids are used. A parametric study was performed to study the impacts of certain input conditions. The results obtained are in well agreement with the literature showing higher rise in temperature in low mass flow rates.