To comprehensively understand the cooling effect of spray evaporation in double skin facade spray systems，a CFD two‑phase flow model for spray cooling double skin facade was established，and a discrete phase model （DPM） based on the Euler-Lagrangian method was employed to track the droplets.Through numerical simulation combined with experimental validation，the effects of parameters such as droplet injection velocity，spray flow rate，and number of nozzles on the cooling performance of the spray system were analyzed.The results show good consistency between the two，with the mean absolute percentage error for most temperature measurements within 15%，indicating that the DPM model can be used for simulation analysis of spray cooling in double skin facade.When the droplet injection velocity increased from 20 m/s to 80 m/s，the evaporative cooling efficiency of the spray system improved by 14.9%.Meanwhile，the spray flow rate also significantly influenced the cooling performance of the spray system.When the spray flow rate increased from 0.01 L/min to 0.09 L/min，the evaporative cooling efficiency of the system improved by 57.2%，the droplet evaporation rate increased by 2.9 μg/s，and the temperature distribution in the cavity became more uniform.The number of nozzles had a considerable impact on the cooling performance of the spray system.With three nozzles，the evaporative cooling efficiency and droplet evaporation rate of the system were 4.29 times and 2.6 times higher，respectively，compared to the single‑nozzle scenario.This research provides theoretical references for the optimal design of spray cooling systems and holds significant importance for improving the cooling performance of double skin facade.