RETROFITTED ROOF SPRAY COOLING SYSTEM FOR GREENHOUSE APPLICATIONS IN TROPICAL CLIMATE CONDITIONS
A tropical climate has a mean temperature between 25 to 27°C with a range of 21°C to 34°C. Due to the low amount of temperature, there is a very limited availability of low temperature thriving plants to sustain in this type of temperature. Thus, this paper presents the possibility of growing temperate plants in a tropical temperature locality like Cebu. One possible solution is the use of protected agriculture (greenhouse) as a modification of a certain environment achieving improved conditions for plant growth. This paper describes the retrofitted roof spray cooling system to reduce the heat stress inside the greenhouse. This greenhouse was located in an open field inside the Cebu Experiment Station, Department of Agriculture – Regional Field Office VII at Mandaue City, Cebu. The retrofitted roof spray cooling system was modified to increase the system’s cooling performance. Results showed that the retrofitted roof spray cooling system was more efficient by 2.86% having the highest efficiency recorded of 17.18%. A maximum amount of temperature of 11.37°C was attained by the system. The system attained an average temperature reduction of 4.07°C throughout the days of testing. In effect, the retrofitted spray cooling system was effective in decreasing the temperature inside the green house thus allows the possibility of temperate plants to grow in this modified cooling system.