Research and Development of Wind Tunnel Type Orchid Moisture Removal Machine

Abstract

A wind tunnel type orchid moisture removal machine was fabricated to replace an using fan blowing direct at the newly cut orchids for moisture removal prior to packing for export, especially during rainy season when orchids contain high moisture. The prototype machine composed of a moisture removal chamber with dimensions of 1.2 x 7.5 m (width x length), a cross flow fan with diameter of 40 cm. and the length of 1.2 meter driven by a 2 hp electrical motor, and a conveyor to transport orchids into the chamber driven by a 0.5 horsepower, an electrical motor with speed reducer gear box. The conveyor is capable of moving in 2 directions. namely the same wind direction or against. Temperature inside the chamber could be controlled by using temperature sensor and a control unit mounted at the side of the machine. The time for moisture removal by the prototype machine and the ordinary direct showing at orchid were compared quality of orchid after moisture removal was determined. Results showed that the fan had been used moisture removal time 30 minutes in rainy off season and 90 minutes in rainy season while the prototype machine could reduce moisture removal time at 7.5 minutes in rainy off season and 15 minutes in rainy season. Quality of orchids after moisture removal from the prototype machine did not affect and had vase life 12-14 days.