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The purposes of this research was to investigate and analyze the effect of fluid flow variation to the performances of tube and fins radiator type. The research was done experimentally to analyze the performances of radiator. The experiment research was carried out in a simulation system of dryer consist of reservoir water tank, a heater, pump to circulate hot water to the radiator and a cooling fan. The variation of mass flow rate of hot water fluids were 0.09 kg/s and 0.18 kg/s, and the cooling air velocity at a constant rate in 1 m/s. The results showed the temperature of air side radiators were tends to decrease over time. This was in line with the heat dissipation of radiator, where they also tend to decrease over time for both variation of mass flow rate. The average heat transfer rate was higher with the higher water flow rate, which were around 3971.65 Watt. The radiators effectiveness (ɛ) tends to increase with the increasing of time with an average of ɛ = 0.34 for hot water mas flow rate 0.09 kg/s, and 0.43 for the hot water mass flow rate 0.18 kg/s. The maximum effectiveness value for both mass flow rate variations were obtained at 30 minutes which is 0.32 and 0.45. Keywords—radiator, fluid flow variation, heat transfer, effectiveness

Experimental Analysis of Fluid Flow Variation Effect to Thermal Performances of Radiator as a Source of Dryer Simulation