Energy efficiency measures - Industrial - Fans - Variable speed / United Kingdom
Case study assignment
Four electric motor-driven fans run at full speed to extract dust from a flour milling plant. Airflow is controlled by varying the position of dampers in the inlet ducts.
Base case
Solution
The worked-out solution is the data file selected from within the RETScreen Project Database. The user automatically downloads the Project Database file while downloading the RETScreen software.
Similar project
At a flour mill in Manchester, UK, four dust extraction fans were fitted with variable speed drive to replace the less efficient damper controlled airflow. Savings were significant.
Real project (6.97 MB)
Case study assignment
Four electric motor-driven fans run at full speed to extract dust from a flour milling plant. Airflow is controlled by varying the position of dampers in the inlet ducts.
Base case
- Motors are 75 kW, premium efficiency
- Fans are variable flow and operate 7,750 h/y
- Two fans operate at less than 50% capacity and two operate in the high flow range
- Load factor 95%
- Electricity rate is £0.043/kWh
- Install variable speed drive on each motor
- Cost for improvements is £13,000 per fan-motor unit
Solution
The worked-out solution is the data file selected from within the RETScreen Project Database. The user automatically downloads the Project Database file while downloading the RETScreen software.
Similar project
At a flour mill in Manchester, UK, four dust extraction fans were fitted with variable speed drive to replace the less efficient damper controlled airflow. Savings were significant.
Real project (6.97 MB)
