- 11 October 2006 -
Pump drive "sets new standards in energy saving"
Danfoss has developed a new range of high efficiency drives for
fans, pumps and compressors that can provide enormous energy savings,
the company says.
The VLT® HVAC Drive has ratings up to 450kW and thus breaches
the 98% efficiency barrier for the first time. This means it can
save thousands of kWhrs over the drives' lifetime and reduce carbon
emissions and the time required to justify the initial investment,
Danfoss says. A 150kW drive for example, based upon continuous operation
in an air conditioning application, will yield a benefit of over
25,000 kWhrs and over 10 tonnes of carbon saving per annum. The
heat emission reduction along with a 50oC ambient specification
also enables the drives to be installed in more compact enclosures
and enables Danfoss to offer an IP66 version as standard.
The VLT® HVAC Drive also improves motor efficiency with Automatic
Energy Optimisation (AEO), whereby flux levels in the driven motor
are continuously monitored and the drive output varied to maintain
ideal motor magnetisation for load conditions. This feature can
improve motor efficiency by 5 - 15% at partial load, the most common
operating conditions for fans, pumps and compressors.
For pump applications, the drive can incorporate a pump cascade
controller as standard. This feature can share running hours evenly
across a multiple pump system, minimising wear on any one pump.

Pump Industry Analyst
Sealing Technology