The aim of this work is to enhance thermal performance characteristics in a solar flat plate collector with inserts typical twisted tapes and Al2O3-water nanofluid as the working fluid. Using twisted tapes make contact surface area and swirl intensity to increase. Numerical present analysis of the thermal and fluid behaviors of the tubes with twisted tapes in different arrangements has been investigated under constant heat flux condition with the Reynolds number ranging from 4000 to 20000. For numerical solution of this problem, The Fluent commercial software has been used in which Realizable k-ε turbulence model was applied. According to the tests, the numerical results show that the twisted tape inserted in a solar flat plate collector induce swirling flows which help to improve fluid mixing, therefore increasing diameter ratio (D*) and revaluation of ratio (N) enhance heat transfer rate and the other hand, the pressure drop and also the friction factor increase. The maximum thermal performance factor of 1.08 is obtained by using twisted tapes with N = 7 and D* = 0.014 at the lowest Reynolds number of 4000
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