Numerical simulation of performance of direct absorption solar collector using carbon nanotube nanofluid

Document Type : Original Article


1 Mechanical and electrical Installations department- BHRC- Tehran-Iran

2 Member of scientific board


Many recent studies have focused on enhanced performance of direct absorption solar collectors in which solar energy directly is absorbed within the fluid. In this study, the performance of direct absorption solar collector using carbon nanotube in the mixture of water and ethylene glycol as working fluid was numerically investigated. A 3-D numerical model is developed by FLUENT 15.0 software and the effect of various parameters such as internal surface emissivity, collector depth, working fluid volume fraction and flowrate on the collector efficiency and outlet temperature is evaluated by this model. The governing equations for mass, momentum and energy are solved by SIMPLE method and the radiative transfer equation is solved by Discrete Ordinate (DO) method. The radiative and thermal properties of nanofluid are determined using experimental methods. The results show that the operating parameters of the collector including efficiency and outlet temperature is increased by increasing the internal surface emissivity using the base fluid as working fluid. The increase of nanofluid volume fraction and collector depth is also results in the efficiency and outlet temperature enhancement.


Main Subjects

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