Effect of crosswind and Air Temperature on the thermal Performance of Natural Draft Dry Cooling Tower (NDDCT)

Due to low heat capacity of the air, however, the performance of dry cooling tower is highly affected by environmental conditions, especially wind condition and the air temperature. A three-dimensional study on the thermal performance of a natural-draft dry-cooling tower (NDDCT) under various crosswind and air temperature conditions is conducted using the viscous Navier-Stokes equations to simulate airflow in and around an NDDCT. From the numerical simulations it has been confirmed that crosswind velocity and air temperature has a great effect on the thermal performance of the NDDCT. Crosswind could degrade the thermal effectiveness, ε th , by more than 30% at crosswind velocity of 15ms -1 and in the same manner 20-35% at 288-300K air temperature variations. The calculated result is between the design and the measured value, and the difference is about 6%.

کلیدواژه ها:

cooling tower ، crosswind ، air temperature ، thermal performance