DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf
ISBN Print: 978-1-56700-356-7
ISSN Online: 2642-3499
ISSN Flash Drive: 2642-3502
THREE DIMENSIONAL NUMERICAL STUDY OF AL2O3-THERMINOL VP-1 NANOFLUID ON HEAT TRANSFER ENHANCEMENT FROM AN ABSORBER TUBE OF A PARABOLIC TROUGH COLLECTOR
要約
Linear parabolic collectors are the most common type of technologies to convert solar energy to heat in the solar thermal power plants. Heat transfer across absorber tubes of parabolic collectors is the main element to find thermal efficiency of collectors. In this study effect of flow parameters such as mass flow rate, size and volume fraction of Gamma-AL2O3 Nanoparticles on the heat transfer enhancement from absorber tube of a parabolic collector is simulated numerically. Simulation is made for a collector similar to the LUZ-2 technology. Monte-Carlo ray tracing method is used to simulate three dimensional heat flux distribution on the absorber. Calculations are made for fall equinoxes (21 September). Therminol VP-1 thermal fluid (base fluid) and Nano-fluid (AL2O3-VP-1) is used as heat transfer fluid (HTF) of the collector. Analysis are made to find effect of mass flow rate on heat transfer rate for the base fluid and comparing with Nano-fluid, effect of Nano-particles size on the convection heat transfer coefficient and effect of Nano-particle volume fraction on heat transfer rate. Results are presented for variation of convection heat transfer with respect to various parameters. It is found that convection heat transfer coefficient will enhance by increasing mass flow rate, and by decreasing particle size without rise of pressure drop. Also it is found that convection heat transfer coefficient will not enhance by increasing Nano-particle volume fraction in turbulent flow. Major contributions are illustrated and compared with the base case.