This research was to design, construct, and compare the wind turbine rotor blade and 4 5 diameter 1.25 meters propeller made of PVC pipe (PVC) which is easy to find materials, local and reduce the cost expense in building wind turbines for choosing suitable for installation on a building or higher.The function test and keep the wind speed (M / s),Speed (RPM), voltage (V) and electricity (mA) of the wind turbine wind speed in the day time 16.00 - 17.00. For a period of 1 months. Each type of wind turbine and the break-even
.When comparing the values of wind turbine rotor blades and 4 5 will see that wind turbine rotor electric potential 4 to average = 16.90 V and current average = 226 mA which more than 5 wind turbine propeller with voltage and current average = 16.32 V average. = 216 mA in wind speed rate, the efficiency of wind turbine blade is 4 0.093 wind turbine rotor is more 5 0.083 or more 10.75 percent as well and also the break even faster than the wind turbine rotor 5 about 1 years. Therefore, wind turbine blade 4 type is suitable for installation in the area of Chanthaburi and the high efficiency.And also can be used to charge stored in the battery, 12 V As energy reserve benefit anymore!Key words: wind turbine,
efficiency for wind turbines, the break-even point
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