Abstract
Development of modern heat exchangers and solar collectors is related with an improvement of heat transfer liquids or modification of the heat transfer surfaces. The latter can be achieved employing the special tapes within the working channels of heat exchangers, while the former is illustrated by loading of nano-powders into base liquids. In current simulation, energy transport and exergy loss of aluminum oxide nanoliquid within a solar collector is presented. Helical twisted tape (HTT) and nanotechnology are used as passive ways for the heat transfer augmentation. Computations of turbulent nanoliquid motion and energy transport in a duct with a HTT were performed. Concentration of nanoparticles is considered to be 0.03. Physical properties of the nanoliquid were assessed with employing special correlations. Results are examined for various magnitudes of revolution (N), Reynolds number (Re) and diameter ratio (D*). Exergy ratio detracts with rise of diameter ratio. So, second law efficiency enhances with augment of N. Also, augmenting all parameters result in lower exergy loss.
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