เอกสารการประชุมวิชาการและเสนอผลงานวิจัย มหาวิทยาลัยทักษิณ ครั้งที่ 19 2552 - page 217

„µ¦ž¦³»¤ª·µ„µ¦Â¨³Áœ°Ÿ¨Šµœª·‹´¥ ¤®µª·š¥µ¨´¥š´„¬·– ‡¦´ÊŠš¸É 19 ž¦³‹Îµže 2552
2
Abstract
This research studied and developed the solar dryer system which was built for drying a bulrush
(Lepironia articulata) which is a raw material for weaving product in Talae Noi community. The solar dryer
system consisted of a plat-plate solar collector with an area of collecting radiation of 8.64 m2. The water flow
through a closed loop copper tube and transferred the heat to the moist air in a dryer room of the volumic capacity
of 22.50 m 3. The flow rate of water was 0.025 kg/s which controlled by an electrical pump of 745.70 W.
Whenever the heat was insufficient, the dryer system will be automatically switched to a heater of 6,000 W which
was an additionally thermal source. The drying condition of the air in the dryer room was automatically controlled
by the PLC unit. To test its performance, the 22 kg of a bulrush was dried in 40-60qC within 16 hours
continuously. The experimental results showed that the maximum thermal efficiency of this system was 41.50 %
and the optimal temperature of 45qC was suitable for reducing the inertial moisture content of 167.03 %db down
to the final moisture content of 9.56 %db. The dried bulrush products have good quality . The drying time for
drying the bulrushes in this dryer was significantly shorter than the products dried with a natural sun drying. And
it’s stronger than the other with a maximum tensile strength was about 165 N.
Keywords: Solar drying, Bulrush, Tensile strength
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