Specific fan power
In air conditioning technology, the specific fan output defines the ratio of the electrical fan output consumed to the air volume flow and is called the SFP value ( specific fan power ). The specific fan power is used to identify the electrical energy consumption and characterizes the degree of performance of a fan system, including belt drive, gear unit and frequency converter.
SFP =
Here P is the power consumption [W] and q is the air volume flow [m 3 / s]. The specific fan output is divided into categories.
| category | specific fan output [Ws / m³] |
|---|---|
| SFP-1 | <500 |
| SFP-2 | 500-750 |
| SFP-3 | 750-1250 |
| SFP-4 | 1250-2000 |
| SFP-5 | 2000-3000 |
| SFP-6 | 3000-4500 |
| SFP-7 | > 4500 |
The smaller the SFP value, the less electrical energy is required to convey one cubic meter of air. Typical values for large systems are between SFP-3… SFP-4 and for small systems between SFP-5… SFP-7.
According to the current Energy Saving Ordinance (EnEV 2013), new systems with more than 4000 m³ / h are only planned with a maximum of SFP-4.
See also
literature
- DIN EN 13779 ventilation of non-residential buildings (e.g. offices)