Design and operation of drip irrigation for small vegetable area using micro-tube
1998
Pornchai Saengungsumalee
This thesis is an experiment about an emitter. The emitter which is adapted from a single core electrical wire covered with black insulation into a micro-tube (a kind of small piping) and uses the principle of water flow loss in a piping system which has a discharge rate. The discharge depends on pressure head, inner diameter and length of pipe. The water pressure in term of the water height varied from 1 m to 6 m. The tube used varied from 0.3 m to 1 m in length. Two sizes of wire could be converted to the inner diameter of the tubes as 0.8 mm and 1.13 mm. Measured discharge was varied from 0.58 litre per hour to 4.26 litre per hour and 1.54 litre per hour to 10.84 litre per hour of the inner diameter respectively. In comparison to, the discharge of the Micro-Tube which varied from 1.92 litre per hour to 11.28 litre per hour for 1.2 mm of inner diameter. The manufacture's coefficient coefficient of variation from this experiment was passed with distinction. The emission uniformity of emitter for 3 areas used 0.8 mm inner diameter of wire tube which was inexpensive. The emission uniformity of a small vegetable area that was the size of 4*20 square m came to 88.86 percent. It had good emission uniformity and is better than the area the size of 10*40 square m which was 85 percent of emission uniformity and an area the size of 20*40 square m in part one came to 85 and 83.63 percent emission uniformity in part two. However, the emission uniformity of the emitter depends on the design, database, apparatus and installation, operating and maintenance and the cost of project investment.
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