Enhancement of Droplets Quality for Fog Cooling System in A Naturally-ventilated Greenhouse Using Axial and Centrifugal Fans Handarto, Dwi Rustam Kendarto, Muhammad Saukat, Totok Herwanto, Kingdomen Pandiangan
Department of Agricultural Engineering and Biosystem Faculty of Agro-industrial Engineering Universitas Padjadjaran
Abstract
A fog cooling system is applied to maintain the desired air temperature and humidity in a greenhouse. For the effective application of this system, droplet sizes belonging to the fog criteria (less than 60 micron) and its uniformity are important parameters that need to be achieved. The objective of this research is to analyze usage of axial and centrifugal fans in order to enhance quality of droplets that generated through 0.1-mm nozzles. The axial fans are installed behind nozzles while the centrifugal fans are installed 80 cm in front of nozzles. The smaller size and more uniform of droplets could create the micro-climate changes in greenhouse become more uniform. The sizes of droplets resulted by axial fan, centrifugal fan, and both axial and centrifugal fans are 11.90 micron, 5.28 micron and 2.69 micron, respectively. The smaller size and more uniform of droplets could create the micro-climate changes in greenhouse become more uniform. Electric energy consumption for axial and centrifugal fans during 62 cycle (6 h 2 min) on fog cooling system is the smallest compare to the other electrical equipments (fogging pump, relay and solenoid valve). Electric energy before and after using axial and centrifugal fans are 6,002.34 kJ and 6,094.29 kJ, respectively.
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