05/09/2012 | Editor: Dominik Stephan
...The motor regulation (EC640/2009) (given below) applies to nearly all motors rated between 0.75 kW and 375 kW.
Minimum efficiency standards have been in effect in the US for years. The proportion of high-efficiency motors (IE2) is significantly higher than in Germany/Europe. The ErP Directive is based on the simple realisation that not using energy is the best solution from both the ecological and economic point of view. A study, carried out by the German DENEFF energy-efficient business initiative, indicates that energy savings by businesses and households could eliminate the need for electricity generation by ten nuclear power stations.
The standard principles of good pump design (working point close to the optimal pump operating point, hydraulically correct pipe dimensioning) and the technologies that are currently available to reduce energy consumption (efficient motors, frequency converters for speed control, hydraulics designed for optimum efficiency, reduction of losses in the coils and bearings) must be exploited to the fullest extent possible.
FfE Research Center for Energy Economics has provided some figures for 2009. The investment costs comprise the cost of the frequency converter (.100 to .200/kW pump rated power) and installation costs of around .2000 per pump unit (these are guideline figures only).
Impeller modification is another method that can be used to adapt centrifugal pumps to the specific application, and reduce pump energy consumption. Reduction of pump and motor power ratings can cut energy consumption by between 10 to 40 per cent. Modification can cost up to .1000 depending on impeller size.
Problems With The Pump? How to Reduce Pump Failures!
Variable speed drives not only save energy and money. They also provide interactive capability. Pumps with sensors and microelectronics become actuators that can ‘intervene’ and affect the process flow.
Communication-enabled pumps with parameterization features can ensure that a desired pressure level and volume flow are available in the reactor at a certain point in time – or that exactly the right mixture of
two substances is added at precisely the right moment.
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