Rosenberg has launched a new range of EC in-line duct fans in metal casings. Available in the following industry standard spigot sizes 160, 200, 250, 315 and 355 they have a lower consumption compared to traditional AC alternatives. Fitted with all usual EC features, such as tacho output (speed sensor), and easy speed controllability by 0-10VDC signal or PWM.
If you were to compare an EC fan against a similar size AC fan, R315L (AC) vs R315G (EC). The AC version has a power consumption (at free air) of 0.317kwa and the EC 0,194kwa. The AC version is also slightly more powerful (max air 1750m³/h / max pressure 700Pa) than the EC (1500m³/h max / 640Pa Max).
If both fans are operated in a typical commercial application, operating point 900m³/h at 300Pa.
The fan will operate at full speed during 8 hours per day and run at half speed the rest of the time, 50 weeks per year, 7 days per week.
|Fan||Power full speed900m³/h @ 300Pa||Power half speed600m³/h at 135Pa||Full speed period||Half speed period||Total (kwh)|
|R315L(AC)||0.318kwa||0.174kwa||2800hrs x 0.138kwa = 890.4kwh||5600hrs x 0.174kwa = 974.4kwh||1864.8kwh|
|R315G(EC)||0.192kwa||0.067kwa||2800hrs x 0.192kwa = 537.6kwh||5600hrs x 0.067kwa = 375.2kwh||912.8kwh|
The table below shows the cost to operate each fan. You can see that the EC version is more cost effective making a yearly saving of £139.99, that is a 49% saving on the comparative AC version.
|Fan||Cost per kwh||Cost per year|
|R315L(AC)||£0.1439 x 1864.8kwh||£268.34|
|R315G(EC)||£0.1439 x 912.80kwh||£131.35|
(data source from www.energysavingtrust.org.uk providing the standard rate for electricity at 14.39p/kwh)
For further information on EC in line duct fans, contact the Axair team today.