Fans, pumps & controls
Design for high fan efficiency
- systems carefully designed to minimise pressure loss (7 - section 11)
Design pump systems for energy efficient operation
- timeswitch(es) to prevent secondary circulating pumps from running unnecessarily at night and dissipating heat stored in the DHW cylinder(s) (6)
Consider high-efficiency motors
- use direct drives rather than belt drives where practical. Where belt drives are used, consider modern flat, synchronous, or ribbed belt drives rather than traditional V-belts, to reduce drive losses (7 - section 11)
- match fan and pump characteristics to the system (normally via speed change) (7 - section 11)
Maintain fans, pumps and controls to keep them operating efficiently
- checking of fans, pumps and associated motors for wear (1)
Specify variable speed drives where appropriate
- variable speed drives to replace existing devices driving fans on air handling units (2)
- variable speed drives to replace existing devices driving pumps (2)
- variable speed drives (7 - section 11, 3 - section 7, 11 - section 04/04/03)
Design fan & pump systems for energy efficient operation
- variable flow controls on pumps and fans to allow systems to respond to variations in load (7 - section 06/01/04, 3)
- reduce pump energy use through optimal pipe and pump sizing and trace heating (4 - section DS10)
- 7-day timeswitches to all extractor fans that are not required to run overnight or at weekends (6)
- fan capacities according to CIBSE Guide F Section 7 Table 7.2 (7 - table 7.2)
Design for high motor efficiency
- motors sized to avoid the greater losses when part loaded (7 - section 11)
Reference Documents
| Series Number | Publisher | Title | |
|---|---|---|---|
| 1 | Carbon Trust | Maintaining the efficient operation of heating and hot water systems | |
| 2 | #N/A | #N/A | |
| 3 | GIR 41 | Carbon Trust | Variable flow control |
| 4 | COP 6/99 | BSRIA | Environmental Code of Practice for Buildings and their Services |
| 5 | GN 13/97 | BSRIA | Oversized cooling and pumping plant - a guide to reduce the energy consumption of oversized cooling or pumping plant |
| 6 | Carbon Trust | Focus - the manager's guide to reducing energy bills | |
| 7 | Guide F | CIBSE | Energy efficiency in buildings |
| 8 | Carbon Trust | Managing Energy Use - minimising running costs of office equiptment and related air-conditioning | |
| 9 | GN 11/97 | BSRIA | Oversized air handling plant - a guide to reduce the energy consumption of oversized constant or variable air volume air handling plant |
| 10 | BRE | The Office Toolkit - the guide for facilities and office managers for reducing costs and environmental impact | |
| 11 | Guide B2 | CIBSE | Ventilation and air conditioning |