Study on using a Solar Greenhouse Dryer Model for Drying Rubber Sheets with a Protective Ultraviolet and Thermal Control in Greenhouse Dryer

บทคัดย่อ

This research was studied on using the solar greenhouse dryer model to dry rubber sheets. This model was designed in cubic shape which had dimension of 1.00 × 1.00 × 1.00 m (w x l x h). Walls on all sides were made from the transparent polycarbonate with an anti-UV 100%.  Three fans power of 0.125 kW electric-motor were used to ventilate the air humidity and control the temperature inside the dryer not to exceed 45 ^oC. These fans were automatically operated by an on-off control device to maintain the set temperature. The drying performance test was conducted with 4 rubber sheets for a time drying. Test results showed that the rubber sheet’s moisture content was reduced from the initial 30% w.b. down to 2.5% w.b. at temperature in dryer less than 45^oC and the UV zero, which takes the time for drying 4-5 days. The quality of the dried rubber sheets were better benchmark in both color and elastic features.