Using VFDs in Refrigeration and Cold Storage Applications (3)
Part Three: Screw compressor VFD application Also read Part One: Introduction Part Two: Variable frequency drives in refrigeration systems Screw compressors used in refrigeration plants are generally available in two types – one with a slide valve for…
What Does It Mean To Have An Energy Efficient Motor?
With energy taking up a large part of a plant’s costs, having efficient technologies throughout can result in significant decreases in operating costs. The industry has seen many advances in energy efficient pumps which happen on a…
Protecting Thrust Bearings in Deepwell Submersible Pumps
When applying variable speed control to deepwell submersible pumps, there are some unique concerns that need to be taken into consideration due to the mechanical design of the pump. One of these concerns is how to protect…
Using VFDs in Refrigeration and Cold Storage Applications (2)
Part Two: Variable frequency drives in refrigeration systems (Part One of this series can be found here) The thermodynamic efficiency of a refrigeration system is significantly dependent on its operating temperatures. Other important practical issues such as…
Component Efficiency and the Ecodesign Directive
The right direction but… The Ecodesign Directive* is the European legislative basis for establishing energy saving measures, and is definitely a step in the right direction. It enables a huge potential for reduction of energy consumption, ensuring…
Making Sense of Sensorless
There is a lot of discussion in the pumping industry about the reliability of sensorless pump control. While controlling pumps through indirect measurements has been available to the market for many years in a variable frequency drives,…
