In this study, has tried to change the length of the pipe in the 5 to 15 cm intervals, inbound and outbound pipe lengths in the range 2 to 32 cm in length by assigning performance values as the length of the pipe (Duct Effective Length) from 10 percent to 125 percent. At length equal to 26.2 cm effective length is the length of the tubing, the flow rate of 100% of the outgoing air to the incoming air, and minimal power consumption. By the pipe length should be less than this value.
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