Experimental study on resistance characteristics of square ceiling diffusers

Designs an air distributor performance laboratory, measures the static pressure loss and the local resistance coefficient of square ceiling diffusers with different sizes at different throat wind speeds under isothermal conditions. The results show that the resistance coefficient of square ceiling diffuser outlet is mainly relevant to its size and structure and unrelated with wind speed. There is a good linear relationship between the average resistance coefficient of square ceiling diffuser outlet and its throat size at different wind speeds. The larger the outlet throat size, the lower the resistance coefficient. Obtains a theoretical formula of resistance coefficient and throat size by fitting the experimental data.