1, pipeline calculation

First, determine the length of the pipeline and assume the diameter of the pipeline. Calculate the frictional resistance per meter of pipeline: r = (λ/d) * (ν 2 * γ/2).

2. Calculate the pressure of the fan: ρ=RL.

3. Determine the air volume: 500 cubic meters.

4. Calculate the fan power: p = 500m3 *ρ/(3600* fan efficiency * 1000* transmission efficiency).

5. Calculation of air volume: Q = ν * r 2 * 3. 14 * 3600.

6. Calculation of wind speed: ν = q/(r 2 * 3. 14 * 3600)

7. Pipe diameter: calculation of d =√(Q*4)/(3600*3. 14*ν)

Second,

1 When the wind speed is 0.5m/s, calculate how long it takes for every 500m3 wind. Assume that the pipe diameter is 0.3m.

Q=ν*r^2*3. 14*3600

=0.5*(0.3/2)^2*3. 14*3600

= 127.2 (cubic)

500/ 127.2=3.9 (hours)

Suggestion: The wind speed should be determined at 12m/s, and the pipeline diameter can be reduced after increasing the wind speed.

γ-air density, optional1.2; Q- flow (h/m3); Independent variable-flow (m/s); R- pipe radius (m); D- pipe diameter (m); P- pressure (pa); R—— frictional resistance (pa) along the route; L- pipe length (m)); ); √-square root; The fan efficiency is 0.79-0.82; The transmission efficiency is 0.95- 1.