Fan Study

Overview
The fans are tested for field performance by measurement of flow, head, temperature on the fan side and electrical motor kW input on the motor side. The air velocity was measured by using anemometer. Multiplication of air velocity with the inlet area gives the air flow.
Formulas
Fan Static Efficiency (η) can be calculated by the formula:
- Fan Static Efficiency (η) = (Volume (m3/s) * ∆p (Total Pressure) mmWC) / (102 * Power Input to Fan Shaft in kW)
Scope of Work
Case Study: Energy conservation Measures : VFD Controlling System Instead Of Damper Controlling At Plant Mill ID Fan
| SN | Parameter | Unit | Value |
|---|---|---|---|
| 1 | Power Consumption of blower | kW | 96.5 |
| 2 | % of throttling at suction valve | % | 50.0 |
| 3 | % of saving Possible | % | 30.0 |
| 4 | Saving power | kW | 28.9 |
| 5 | Opt. Hr/day | Hr | 24.0 |
| 6 | Unit cost Rs | Rs./kWh | 8.10 |
| 7 | Annual operation Day | Day | 300.0 |
| 8 | Annual Power Saving | kWh | 208393.0 |
| 9 | Annual Monetary saving | Rs. | 1687983.5 |
| 10 | Investment | Rs. | Nil |
| 11 | Simple Payback Period | Month | Immediate |
Mill Blower Trial Data
Mill Blower Trial Data
| SN | Parameter | Unit | Regular Running | During Trial |
|---|---|---|---|---|
| 1 | Damper Position | % | 50% Close | 100% Open |
| 2 | Fan Suction Pressure Before Damper | mmWC | 231.2 | 231.2 |
| 3 | Fan Suction Pressure After Damper | mmWC | 788.800 | 286.96 |
| 4 | Fan Discharge Pressure | mmWC | 43.52 | 43.52 |
| 5 | Flow | m3/hr | 30200.0 | 30500 |
| 6 | Power | kW | 86 | 46 |
| 7 | Fan Frequency | Hz | 48.6 | 37 |
| 8 | Whizzer Frequency | Hz | 21 | 21 |
| 9 | Mill Frequency | Hz | 39 | 39 |

Mill Suction Damper 50% Throttling

Mill Suction Damper Full Open
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