What is the hourly air volume of an 11kw Roots blower**
**Accurate analysis of power and gas delivery efficiency**
**1. The core logic of air volume calculation**
The hourly air volume (m3/h) of an 11kW Roots blower depends on the system pressure, speed, and volumetric efficiency, and the calculation formula is:
\[
Q = \frac{60 \times P \times \eta_v}{\Delta P} \times K
\]
-(Q): Actual air volume (m3/h)
-(P): Motor power (11kW)
-(\ eta-v \): Volume efficiency (taken as 0.85~0.9)
-\ (\ Delta P \): System pressure difference (kPa)
-(K): Condition correction factor (altitude, temperature, etc.)
**Example * *:
When the pressure is 49 kPa:
\[
Q = \frac{60 \times 11 \times 0.88}{49} \times 0.95 ≈ 10.8 \, \text{m3/min} = 648 \, \text{m3/h}
\]
**2. Comparison between measured data and industry**
|Brand model | Nominal pressure (kPa) | Calibrated air volume (m3/h) | Actual measurement deviation|
|-------------|------------------|-------------------|----------|
| RC-80 | 39.2 | 720 | +3.2 |
| 3L15WD | 58.8 | 540 | -2.1 |
| -55 | 49.0 | 648 | ±1.5 |
**Case * *: A sewage treatment plant uses an 11kW fan at an altitude of 1500 meters (correction factor 0.92), with an actual air volume of 648 × 0.92=596 m3/h, requiring an additional air supply device.
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**What factors affect the airflow of an 11 kW Roots blower**
**Dismantling from environmental variables to mechanical losses**
**1. Five key influencing factors**
1. * * System back pressure * *: For every 9.8 kPa increase in pressure, the air volume decreases by 12-18;
2. * * Inlet temperature * *: For every 10 ℃ increase in temperature, the air volume decreases by 3-5 (gas expansion effect);
3. * * Transmission efficiency * *: The belt transmission loss is about 5, and the direct connection loss is ≤ 2;
4. * * Filtration resistance * *: A dirty and clogged filter can reduce air volume by 20%;
5. * * Sealing leakage * *: When the gap is greater than 0.25mm, the leakage rate exceeds 5.
**2. Optimization plan and effect**
-Variable frequency speed regulation: Reduce the motor speed from 2900 rpm to 2400 rpm, adjust the air volume to 85, and save energy by 23;
-* * Impeller coating * *: Spraying polytetrafluoroethylene to reduce gas viscosity loss and increase air flow by 2-3;
-* * Intelligent monitoring * *: Installing pressure sensors and PLC control improves air volume stability to ± 1.
