Aerodynamic tests of small sized devices of recycled water-cooling

Abstract

Abstract There is given a method of aerodynamic resistance coefficient determination of small-sized devices sprinklers of recycled water-cooling (mini cooling towers) in this article. Mini cooling towers are widely used at systems of recycled water supply in enterprises, because it are mobile, services a specific technological units or apparatuses, have a less energy intensity, more effective and safety unlike of oversized. There was compared two types of mini cooling towers in this labor: small-sized cooling tower with twisted air flow and with counter current flow. Also was developed and made the experimental unit for carry out of aerodynamic tests. The experiments on determination of aerodynamic resistance coefficient carried out depending on air flow rate in the interval from 0.5 to 3 m/s and irrigation density from 0 to 12 m3/(m2h). It shown that the sprinkler OB-65 (for mini cooling towers with twisted air flow, with diameter mesh casings 65mm) have more high aerodynamic resistance coefficient than the sprinkler OGGT-65 (for mini cooling towers with counter current flow with diameter mesh casings 65 mm) at the equal parameters of the experiment. Obtained coefficients of aerodynamic resistance of sprinklers in the mini cooling towers with the twisted air flow and with counter current flow approximated by the method of least squares and are presented as linear dependences in logarithmic coordinates of aerodynamic resistance and Reynolds number. It known that the coefficient of aerodynamic resistance is determine by common relation A/ReK.