Numerical study on performance of counter flow dew point evaporative coolers with internal grille

 In order to improve the cooling efficiency of the counter flow dew point evaporative cooler, optimizes the structure of the cooler and proposes a new type of dew point evaporative cooler with internal grille. Establishes a two-dimensional mathematical model describing the heat and moisture transfer process inside the cooler, and compares the cooling effect of five kinds of the dew point evaporative cooler with different inlet air temperatures and humidities, different inlet air speeds and different secondary to primary air ratios by solving the numerical model. The simulation results show that the dew point evaporative cooler with double-layer grille (model E) can effectively improve the uneven distribution of primary air in the dry channel and greatly improve the cooling efficiency. Compared with the ordinary dew point evaporative cooler (model A) without grille, the wet bulb efficiency of model E under the conditions of inlet air temperature (25 ℃ to 45 ℃) and moisture content (6.9 g/kg to 14.5 g/kg) increases by 10.2% to 37.9%. When the inlet air velocity is 1.5 m/s to 8.5 m/s, the wet bulb efficiency of model E increases by 17.32% on average, and the dew point efficiency increases by 12.32% on average. When the air volume ratio is 0.4 to 0.6, the wet bulb efficiency of model E increases by 20.6% on average, and the dew point efficiency increases by 13.6% on average.