TY - JOUR
TI - Simultaneous effects of water spray and crosswind on performance of natural draft dry cooling tower
AU - Ahmadikia Hossein
AU - Soleimani Mohsen
AU - Gholami Ehsan
JN - Thermal Science
PY - 2013
VL - 17
IS - 2
SP - 443
EP - 455
PT - Article
AB - To investigate the effect of water spray and crosswind on the effectiveness  of the natural draft dry cooling tower (NDDCT), a three-dimensional model has  been developed. Efficiency of NDDCT is improved by water spray system at the  cooling tower entrance for high ambient temperature condition with and  without crosswind. The natural and forced heat convection flow inside and  around the NDDCT is simulated numerically by solving the full Navier-Stokes  equations in both air and water droplet phases. Comparison of the numerical  results with one-dimensional analytical model and the experimental data  illustrates a well-predicted heat transfer rate in the cooling tower.  Applying water spray system on the cooling tower radiators enhances the  cooling tower efficiency at both no wind and windy conditions. For all values  of water spraying rate, NDDCTs operate most effectively at the crosswind  velocity of 3m/s and as the wind speed continues to rise to more than 3 m/s  up to 12 m/s, the tower efficiency will decrease by approximately 18%, based  on no-wind condition. The heat transfer rate of radiator at wind velocity 10  m/s is 11.5% lower than that of the no wind condition. This value is 7.5% for  water spray rate of 50kg/s.