- Home
- News
All the latest updates on building safety reformRegulations latest
- Focus
- Comment
- Programmes
- CPD
- Building the Future
- Jobs
- Data
- Subscribe
- Events
2024 events calendar
Explore now
Building Awards
Keep up to date
- Building Boardroom
- Previous slide
- 1 of 1
- Next slide
| Part L: Fan and system efficiencies for a typical AHU | ||
| Unit reference | AHU 1 SUPPLY | AHU 1 EXTRACT |
| Design criteria | ||
| Design capacity (m3/s) | 22 | 17.1 |
| Design static (Pa) | 1089 | 696 |
| Quantity of velocity pressures | 1 | 1 |
| Max w/l/s | 2.5 | 2.5 |
| Max system input power / kw | 55 | 42.75 |
| Preselection criteria | ||
| Max discharge velocity | 12 | 12 |
| Nominal dynamic (based on above discharge velocity) | 86.4 | 86.4 |
| Nominal total pressure | 1175.4 | 782.4 |
| Nominal required system efficiency to meet pressure | 47.02% | 31.30% |
| Selected fan data | ||
| Dynamic (Pa) | 112 | 107 |
| Shaft power (kW) | 28.4 | 15.84 |
| Installed motor power (kW) | 2 x 30 | 2 x 15 |
| Fan shaft efficiency | 93.04% | 86.69% |
| Based on | 2 x 800 | 2 x 710 |
| Motor efficiency (nominal) | 93.40% | 93.40% |
| Based on | ||
| Belt drive efficiency (nominal) | 94.00% | 94.00% |
| Based on | belt drive | belt drive |
| Inverter efficiency (nominal) | 96.50% | 96.50% |
| Based on Danfoss VLT6000 at 75% load | ||
| Total tolerance of fanset components | 0.00% | 0.00% |
| Based on | Not considered | Not considered |
| Actual system input power (kW) | 33.52 | 18.7 |
| Max actual system input power (kW including tolerances) | 33.52 | 18.7 |
| System heat loss per volume flow rate (W/ l /s) | 1.52 | 1.09 |
| Max (W/ l/s) including tolerances | 1.52 | 1.09 |
| Total system efficiency | 78.82% | 73.44% |
| Worst case total system efficiency including tolerances | 78.82% | 73.44% |
| Reselection criteria | ||
| Max static (Pa based on above component efficiencies) | 1858.6 | 1729.1 |
| Max total pressure (Pa based on above component efficiencies) | 1970.56 | 1836.11 |
| System heat loss per volume flow rate (W / l /s) | 2.3735 | |
| (with supply and extract powers/supply air vol) | ||
| Heat wheel heat recovery | Winter | 74.30% |
| Summer | 76.00% | |
| Air Pressure drop on the AHUS | ||
| Volume (m3/s) | 22 | 17.1 |
| External static pressure (Pa) | 300 | 250 |
| Louvre (Pa) | INC | INC |
| Damper (Pa) | 40 | 75 |
| Electric frost (Pa) | 20 | 0 |
| Panel/bag AHU 1 clean (Pa) | 188 | 87 |
| Thermal wheel (Pa) | 158 | 117 |
| Cooler & eliminator (Pa) | 209 | 0 |
| Electric heater (Pa) | 20 | 0 |
| Atmospheric attenuation (Pa) | 16 | 14 |
| Non-return dampers (Pa) | 70 | 70 |
| Diffuser (Pa) | 50 | 45 |
| Jobside attenuation (Pa) | 18 | 38 |
| Totals | 1089 | 696 |