Experimental Study on the Nozzle of High-Pressure Fog Cooling Systems in Greenhouses

This paper describes a designed new nozzle and provides experimental studies on the nozzle used in high-pressure fog cooling system in Greenhouses. Fogging droplet sizes of the nozzle is measured by MPA Malvern Particle Analyzer. The diameter of droplet sizes (VMD, Dv10, Dv50, Dv90) which is 500 mm far from the nozzle is measured and analyzed when the pump pressure is 2, 3, 4, 5, 6,7MPa.The experimental results shows: the nozzle has fine fogging performance, and its droplet sizes (VMD) are small and less than 30 microns when operating pressure is more than 5MPa.